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JDBC driver for MariaDB and MySQL for java 7
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/*
*
* MariaDB Client for Java
*
* Copyright (c) 2012-2014 Monty Program Ab.
* Copyright (c) 2015-2017 MariaDB Ab.
*
* This library is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 2.1 of the License, or (at your option)
* any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License along
* with this library; if not, write to Monty Program Ab [email protected].
*
* This particular MariaDB Client for Java file is work
* derived from a Drizzle-JDBC. Drizzle-JDBC file which is covered by subject to
* the following copyright and notice provisions:
*
* Copyright (c) 2009-2011, Marcus Eriksson
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this list
* of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice, this
* list of conditions and the following disclaimer in the documentation and/or
* other materials provided with the distribution.
*
* Neither the name of the driver nor the names of its contributors may not be
* used to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
*/
package org.mariadb.jdbc;
import org.mariadb.jdbc.internal.logging.Logger;
import org.mariadb.jdbc.internal.logging.LoggerFactory;
import org.mariadb.jdbc.internal.protocol.Protocol;
import org.mariadb.jdbc.internal.util.CallableStatementCache;
import org.mariadb.jdbc.internal.util.ClientPrepareStatementCache;
import org.mariadb.jdbc.internal.util.Options;
import org.mariadb.jdbc.internal.util.Utils;
import org.mariadb.jdbc.internal.util.dao.CallableStatementCacheKey;
import org.mariadb.jdbc.internal.util.dao.CloneableCallableStatement;
import org.mariadb.jdbc.internal.util.exceptions.ExceptionMapper;
import java.net.SocketException;
import java.sql.*;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.Executor;
import java.util.concurrent.locks.ReentrantLock;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MariaDbConnection implements Connection {
private static Logger logger = LoggerFactory.getLogger(MariaDbConnection.class);
/**
* Pattern to check the correctness of callable statement query string
* Legal queries, as documented in JDK have the form:
* {[?=]call[(arg1,..,,argn)]}
*/
private static Pattern CALLABLE_STATEMENT_PATTERN =
Pattern.compile("^\\s*(\\?\\s*=)?(\\s*\\/\\*([^\\*]|\\*[^\\/])*\\*\\/)*\\s*call(\\s*\\/\\*([^\\*]|\\*[^\\/])*\\*\\/)*\\s*"
+ "((((`[^`]+`)|([^`]+))\\.)?((`[^`]+`)|([^`\\(]+)))\\s*(\\(.*\\))?(\\s*\\/\\*([^\\*]|\\*[^\\/])*\\*\\/)*\\s*(#.*)?$",
Pattern.CASE_INSENSITIVE);
/**
* Check that query can be executed with PREPARE.
*/
private static Pattern PREPARABLE_STATEMENT_PATTERN =
Pattern.compile("^(\\s*\\/\\*([^\\*]|\\*[^\\/])*\\*\\/)*\\s*(SELECT|UPDATE|INSERT|DELETE|REPLACE|DO|CALL)",
Pattern.CASE_INSENSITIVE);
public final ReentrantLock lock;
/**
* the protocol to communicate with.
*/
private final Protocol protocol;
private final String initialUrl;
private final ClientPrepareStatementCache clientPrepareStatementCache;
public MariaDbPooledConnection pooledConnection;
protected CallableStatementCache callableStatementCache;
protected boolean noBackslashEscapes;
protected boolean nullCatalogMeansCurrent = true;
private volatile int lowercaseTableNames = -1;
private boolean canUseServerTimeout = false;
private boolean sessionStateAware = true;
/**
* save point count - to generate good names for the savepoints.
*/
private int savepointCount = 0;
/**
* the properties for the client.
*/
private Options options;
private boolean warningsCleared;
/**
* Creates a new connection with a given protocol and query factory.
*
* @param initialUrl initial url
* @param protocol the protocol to use.
* @param lock lock
*/
private MariaDbConnection(String initialUrl, Protocol protocol, ReentrantLock lock) throws SQLException {
this.protocol = protocol;
this.initialUrl = initialUrl;
options = protocol.getOptions();
canUseServerTimeout = protocol.versionGreaterOrEqual(10, 1, 2);
noBackslashEscapes = protocol.noBackslashEscapes();
sessionStateAware = protocol.sessionStateAware();
nullCatalogMeansCurrent = options.nullCatalogMeansCurrent;
if (options.cacheCallableStmts) {
callableStatementCache = CallableStatementCache.newInstance(options.callableStmtCacheSize);
}
this.lock = lock;
if (options.cachePrepStmts) {
this.clientPrepareStatementCache = ClientPrepareStatementCache.newInstance(options.prepStmtCacheSize);
} else {
clientPrepareStatementCache = null;
}
}
public static MariaDbConnection newConnection(String initialUrl, Protocol protocol, ReentrantLock lock) throws SQLException {
return new MariaDbConnection(initialUrl, protocol, lock);
}
public static String quoteIdentifier(String string) {
return "`" + string.replaceAll("`", "``") + "`";
}
/**
* UnQuote string.
*
* @param string value
* @return unquote string
* @deprecated since 1.3.0
*/
@Deprecated
public static String unquoteIdentifier(String string) {
if (string != null && string.startsWith("`") && string.endsWith("`") && string.length() >= 2) {
return string.substring(1, string.length() - 1).replace("``", "`");
}
return string;
}
Protocol getProtocol() {
return protocol;
}
/**
* creates a new statement.
*
* @return a statement
* @throws SQLException if we cannot create the statement.
*/
public Statement createStatement() throws SQLException {
checkConnection();
return new MariaDbStatement(this, ResultSet.TYPE_FORWARD_ONLY);
}
/**
* Creates a Statement object that will generate ResultSet objects with the given type
* and concurrency. This method is the same as the createStatement method above, but it allows the
* default result set type and concurrency to be overridden.
* The holdability of the created result sets can be determined by calling {@link #getHoldability}.
*
* @param resultSetType a result set type; one of ResultSet.TYPE_FORWARD_ONLY,
* ResultSet.TYPE_SCROLL_INSENSITIVE, or
* ResultSet.TYPE_SCROLL_SENSITIVE
* @param resultSetConcurrency a concurrency type; one of ResultSet.CONCUR_READ_ONLY or
* ResultSet.CONCUR_UPDATABLE
* @return a new Statement object that will generate ResultSet objects with the given
* type and concurrency
* @throws SQLException if a database access error occurs, this method is called on a closed connection or the given
* parameters are not ResultSet constants indicating type and concurrency
*/
public Statement createStatement(final int resultSetType, final int resultSetConcurrency) throws SQLException {
return new MariaDbStatement(this, resultSetType);
}
/**
* Creates a Statement object that will generate ResultSet objects with the given type,
* concurrency, and holdability.
* This method is the same as the createStatement method above, but it allows the default result set
* type, concurrency, and holdability to be overridden.
*
* @param resultSetType one of the following ResultSet constants:
* ResultSet.TYPE_FORWARD_ONLY,
* ResultSet.TYPE_SCROLL_INSENSITIVE, or
* ResultSet.TYPE_SCROLL_SENSITIVE
* @param resultSetConcurrency one of the following ResultSet constants:
* ResultSet.CONCUR_READ_ONLY or
* ResultSet.CONCUR_UPDATABLE
* @param resultSetHoldability one of the following ResultSet constants:
* ResultSet.HOLD_CURSORS_OVER_COMMIT or
* ResultSet.CLOSE_CURSORS_AT_COMMIT
* @return a new Statement object that will generate ResultSet objects with the given
* type, concurrency, and holdability
* @throws SQLException if a database access error occurs, this method is called on a closed
* connection or the given parameters are not ResultSet
* constants indicating type, concurrency, and holdability
* @throws SQLFeatureNotSupportedException if the JDBC driver does not support this method or this method is not
* supported for the specified result set type, result set holdability
* and result set concurrency.
* @see ResultSet
* @since 1.4
*/
public Statement createStatement(final int resultSetType, final int resultSetConcurrency, final int resultSetHoldability)
throws SQLException {
if (resultSetConcurrency != ResultSet.CONCUR_READ_ONLY) {
throw ExceptionMapper.getFeatureNotSupportedException("Only read-only result sets allowed");
}
return createStatement();
}
protected void checkConnection() throws SQLException {
if (protocol.isExplicitClosed()) {
throw new SQLException("createStatement() is called on closed connection");
}
if (protocol.isClosed() && protocol.getProxy() != null) {
lock.lock();
try {
protocol.getProxy().reconnect();
} finally {
lock.unlock();
}
}
}
/**
* creates a new client prepared statement.
*
* @param sql the query.
* @return a prepared statement.
* @throws SQLException if there is a problem preparing the statement.
*/
protected MariaDbPreparedStatementClient clientPrepareStatement(final String sql) throws SQLException {
return new MariaDbPreparedStatementClient(this, sql, ResultSet.TYPE_FORWARD_ONLY);
}
/**
* creates a new prepared statement.
*
* @param sql the query.
* @return a prepared statement.
* @throws SQLException if there is a problem preparing the statement.
*/
public PreparedStatement prepareStatement(final String sql) throws SQLException {
return internalPrepareStatement(sql, ResultSet.TYPE_FORWARD_ONLY);
}
/**
* Creates a PreparedStatement object that will generate ResultSet objects with the given
* type and concurrency. This method is the same as the prepareStatement method above, but it allows
* the default result set type and concurrency to be overridden. The holdability of the created result sets can be
* determined by calling {@link #getHoldability}.
*
* @param sql a String object that is the SQL statement to be sent to the database;
* may contain one or more '?' IN parameters
* @param resultSetType a result set type; one of ResultSet.TYPE_FORWARD_ONLY,
* ResultSet.TYPE_SCROLL_INSENSITIVE, or
* ResultSet.TYPE_SCROLL_SENSITIVE
* @param resultSetConcurrency a concurrency type; one of ResultSet.CONCUR_READ_ONLY or
* ResultSet.CONCUR_UPDATABLE
* @return a new PreparedStatement object containing the pre-compiled SQL statement that will produce
* ResultSet objects with the given type and concurrency
* @throws SQLException if a database access error occurs, this method is called on a closed connection or the
* given parameters are notResultSet constants indicating type and concurrency
*/
public PreparedStatement prepareStatement(final String sql, final int resultSetType, final int resultSetConcurrency)
throws SQLException {
return internalPrepareStatement(sql, resultSetType);
}
/**
* Creates a PreparedStatement object that will generate ResultSet objects with the
* given type, concurrency, and holdability.
* This method is the same as the prepareStatement method above, but it allows the default result
* set type, concurrency, and holdability to be overridden.
*
* @param sql a String object that is the SQL statement to be sent to the database;
* may contain one or more '?' IN parameters
* @param resultSetType one of the following ResultSet constants:
* ResultSet.TYPE_FORWARD_ONLY,
* ResultSet.TYPE_SCROLL_INSENSITIVE, or
* ResultSet.TYPE_SCROLL_SENSITIVE
* @param resultSetConcurrency one of the following ResultSet constants:
* ResultSet.CONCUR_READ_ONLY or
* ResultSet.CONCUR_UPDATABLE
* @param resultSetHoldability one of the following ResultSet constants:
* ResultSet.HOLD_CURSORS_OVER_COMMIT or
* ResultSet.CLOSE_CURSORS_AT_COMMIT
* @return a new PreparedStatement object, containing the pre-compiled SQL statement, that will
* generate ResultSet objects with the given type, concurrency, and holdability
* @throws SQLException if a database access error occurs, this method is called on a closed
* connection or the given parameters are not
* ResultSet constants indicating type, concurrency, and
* holdability
* @throws SQLFeatureNotSupportedException if the JDBC driver does not support this method or this method is not
* supported for the specified result set type, result set holdability and
* result set concurrency.
* @see ResultSet
* @since 1.4
*/
public PreparedStatement prepareStatement(final String sql,
final int resultSetType,
final int resultSetConcurrency,
final int resultSetHoldability) throws SQLException {
if (resultSetConcurrency != ResultSet.CONCUR_READ_ONLY) {
throw ExceptionMapper.getFeatureNotSupportedException("Only read-only result sets allowed");
}
//TODO : implement parameters
// resultSetType is ignored since we always are scroll insensitive
return prepareStatement(sql);
}
/**
* Creates a default PreparedStatement object that has the capability to retrieve auto-generated keys. The given constant tells
* the driver whether it should make auto-generated keys available for retrieval. This parameter is ignored if the SQL statement is not an
* INSERT statement, or an SQL statement able to return auto-generated keys (the list of such statements is vendor-specific).
* Note: This method is optimized for handling parametric SQL statements that benefit from precompilation. If the driver supports
* precompilation, the method prepareStatement will send the statement to the database for precompilation. Some drivers may not
* support precompilation. In this case, the statement may not be sent to the database until the PreparedStatement object is
* executed. This has no direct effect on users; however, it does affect which methods throw certain SQLExceptions.
* Result sets created using the returned PreparedStatement object will by default be type TYPE_FORWARD_ONLY and
* have a concurrency level of CONCUR_READ_ONLY. The holdability of the created result sets can be determined by calling {@link
* #getHoldability}.
*
* @param sql an SQL statement that may contain one or more '?' IN parameter placeholders
* @param autoGeneratedKeys a flag indicating whether auto-generated keys should be returned; one of
* Statement.RETURN_GENERATED_KEYS
* or Statement.NO_GENERATED_KEYS
* @return a new PreparedStatement object, containing the pre-compiled SQL statement, that will have
* the capability of returning auto-generated keys
* @throws SQLException if a database access error occurs, this method is called on a closed
* connection or the given parameter is not a Statement
* constant indicating whether auto-generated keys should be returned
* @throws SQLFeatureNotSupportedException if the JDBC driver does not support this method with a constant of
* Statement.RETURN_GENERATED_KEYS
* @since 1.4
*/
public PreparedStatement prepareStatement(final String sql, final int autoGeneratedKeys) throws SQLException {
return internalPrepareStatement(sql, ResultSet.TYPE_FORWARD_ONLY);
}
/**
* Creates a default PreparedStatement object capable of returning the auto-generated keys designated by the given array. This
* array contains the indexes of the columns in the target table that contain the auto-generated keys that should be made available. The driver
* will ignore the array if the SQL statement is not an INSERT statement, or an SQL statement able to return auto-generated keys
* (the list of such statements is vendor-specific).
* An SQL statement with or without IN parameters can be pre-compiled and stored in a PreparedStatement object. This object can
* then be used to efficiently execute this statement multiple times.
* Note: This method is optimized for handling parametric SQL statements that benefit from precompilation. If the driver supports
* precompilation, the method prepareStatement will send the statement to the database for precompilation. Some drivers may not
* support precompilation. In this case, the statement may not be sent to the database until the PreparedStatement object is
* executed. This has no direct effect on users; however, it does affect which methods throw certain SQLExceptions.
*
* Result sets created using the returned PreparedStatement object will by default be type TYPE_FORWARD_ONLY and have a
* concurrency level of CONCUR_READ_ONLY. The holdability of the created result sets can be determined by calling {@link
* #getHoldability}.
*
* @param sql an SQL statement that may contain one or more '?' IN parameter placeholders
* @param columnIndexes an array of column indexes indicating the columns that should be returned from the inserted row or rows
* @return a new PreparedStatement object, containing the pre-compiled statement, that is capable of returning the auto-generated
* keys designated by the given array of column indexes
* @throws SQLException if a database access error occurs or this method is called on a closed connection
* @throws SQLFeatureNotSupportedException if the JDBC driver does not support this method
* @since 1.4
*/
public PreparedStatement prepareStatement(final String sql, final int[] columnIndexes) throws SQLException {
return prepareStatement(sql, Statement.RETURN_GENERATED_KEYS);
}
/**
* Creates a default PreparedStatement object capable of returning the auto-generated keys designated by the given array.
* This array contains the names of the columns in the target table that contain the auto-generated keys that should be returned. The driver will
* ignore the array if the SQL statement is not an INSERT statement, or an SQL statement able to return auto-generated keys
* (the list of such statements is vendor-specific).
* An SQL statement with or without IN parameters can be pre-compiled and stored in a PreparedStatement object. This object can
* then be used to efficiently execute this statement multiple times.
* Note: This method is optimized for handling parametric SQL statements that benefit from precompilation. If the driver supports
* precompilation, the method prepareStatement will send the statement to the database for precompilation. Some drivers may not
* support precompilation. In this case, the statement may not be sent to the database until the PreparedStatement object is
* executed. This has no direct effect on users; however, it does affect which methods throw certain SQLExceptions.
* Result sets created using the returned PreparedStatement object will by default be type TYPE_FORWARD_ONLY and
* have a concurrency level of CONCUR_READ_ONLY. The holdability of the created result sets can be determined by calling {@link
* #getHoldability}.
*
* @param sql an SQL statement that may contain one or more '?' IN parameter placeholders
* @param columnNames an array of column names indicating the columns that should be returned from the inserted row or rows
* @return a new PreparedStatement object, containing the pre-compiled statement, that is capable of returning the auto-generated
* keys designated by the given array of column names
* @throws SQLException if a database access error occurs or this method is called on a closed connection
* @throws SQLFeatureNotSupportedException if the JDBC driver does not support this method
* @since 1.4
*/
public PreparedStatement prepareStatement(final String sql, final String[] columnNames) throws SQLException {
return prepareStatement(sql, Statement.RETURN_GENERATED_KEYS);
}
/**
* Send ServerPrepareStatement or ClientPrepareStatement depending on SQL query and options
* If server side and PREPARE can be delayed, a facade will be return, to have a fallback on client prepareStatement.
*
* @param sql sql query
* @param resultSetScrollType one of the following ResultSet constants: ResultSet.TYPE_FORWARD_ONLY,
* ResultSet.TYPE_SCROLL_INSENSITIVE, or ResultSet.TYPE_SCROLL_SENSITIVE
* @return PrepareStatement
* @throws SQLException if a connection error occur during the server preparation.
*/
public PreparedStatement internalPrepareStatement(final String sql, final int resultSetScrollType)
throws SQLException {
if (sql != null) {
String sqlQuery = Utils.nativeSql(sql, noBackslashEscapes);
if (options.useServerPrepStmts && PREPARABLE_STATEMENT_PATTERN.matcher(sqlQuery).find()) {
//prepare isn't delayed -> if prepare fail, fallback to client preparedStatement?
checkConnection();
try {
return new MariaDbPreparedStatementServer(this, sqlQuery, resultSetScrollType, true);
} catch (SQLNonTransientConnectionException e) {
throw e;
} catch (SQLException e) {
//on some specific case, server cannot prepared data (CONJ-238)
//will use clientPreparedStatement
}
}
return new MariaDbPreparedStatementClient(this, sqlQuery, resultSetScrollType);
} else {
throw new SQLException("SQL value can not be NULL");
}
}
/**
* Creates a CallableStatement object for calling
* database stored procedures.
* The CallableStatement object provides
* methods for setting up its IN and OUT parameters, and
* methods for executing the call to a stored procedure.
* example : {?= call <procedure-name>[(<arg1>,<arg2>, ...)]}
* or {call <procedure-name>[(<arg1>,<arg2>, ...)]}
*
* Note: This method is optimized for handling stored
* procedure call statements.
*
*
* @param sql an SQL statement that may contain one or more '?'
* parameter placeholders. Typically this statement is specified using JDBC
* call escape syntax.
* @return a new default CallableStatement object containing the
* pre-compiled SQL statement
* @throws SQLException if a database access error occurs
* or this method is called on a closed connection
*/
public CallableStatement prepareCall(final String sql) throws SQLException {
checkConnection();
String query = Utils.nativeSql(sql, noBackslashEscapes);
Matcher matcher = CALLABLE_STATEMENT_PATTERN.matcher(query);
if (!matcher.matches()) {
throw new SQLSyntaxErrorException(
"invalid callable syntax. must be like {? = call [(?,?, ...)]}\n but was : "
+ query);
}
boolean isFunction = (matcher.group(1) != null);
String databaseAndProcedure = matcher.group(6);
String database = matcher.group(8);
String procedureName = matcher.group(11);
String arguments = matcher.group(14);
if (database == null && sessionStateAware) database = getDatabase();
if (database != null && options.cacheCallableStmts) {
if (callableStatementCache.containsKey(new CallableStatementCacheKey(database, query))) {
try {
CallableStatement callableStatement = callableStatementCache.get(new CallableStatementCacheKey(database, query));
if (callableStatement != null) {
//Clone to avoid side effect like having some open resultSet.
return ((CloneableCallableStatement) callableStatement).clone(this);
}
} catch (CloneNotSupportedException cloneNotSupportedException) {
cloneNotSupportedException.printStackTrace();
}
}
CallableStatement callableStatement = createNewCallableStatement(query, procedureName, isFunction, databaseAndProcedure, database,
arguments);
callableStatementCache.put(new CallableStatementCacheKey(database, query), callableStatement);
return callableStatement;
}
return createNewCallableStatement(query, procedureName, isFunction, databaseAndProcedure, database, arguments);
}
/**
* Creates a CallableStatement object that will generate ResultSet objects with the given
* type and concurrency. This method is the same as the prepareCall method above, but it allows the
* default result set type and concurrency to be overridden.
* The holdability of the created result sets can be determined by calling {@link #getHoldability}.
*
* @param sql a String object that is the SQL statement to be sent to the database;
* may contain on or more '?' parameters
* @param resultSetType a result set type; one of ResultSet.TYPE_FORWARD_ONLY,
* ResultSet.TYPE_SCROLL_INSENSITIVE, or
* ResultSet.TYPE_SCROLL_SENSITIVE
* @param resultSetConcurrency a concurrency type; one of ResultSet.CONCUR_READ_ONLY or
* ResultSet.CONCUR_UPDATABLE
* @return a new CallableStatement object containing the pre-compiled SQL statement that will produce
* ResultSet objects with the given type and concurrency
* @throws SQLException if a database access error occurs, this method is called on a closed
* connection or the given parameters are not
* ResultSet constants indicating type and concurrency
* @throws SQLFeatureNotSupportedException if the JDBC driver does not support this method or this method is not
* supported for the
* specified result set type and result set concurrency.
*/
public CallableStatement prepareCall(final String sql, final int resultSetType, final int resultSetConcurrency) throws SQLException {
return prepareCall(sql);
}
/**
* Creates a CallableStatement object that will generate ResultSet objects with the given
* type and concurrency. This method is the same as the prepareCall method above, but it allows the
* default result set type, result set concurrency type and holdability to be overridden.
*
* @param sql a String object that is the SQL statement to be sent to the database;
* may contain on or more '?' parameters
* @param resultSetType one of the following ResultSet constants:
* ResultSet.TYPE_FORWARD_ONLY,
* ResultSet.TYPE_SCROLL_INSENSITIVE, or
* ResultSet.TYPE_SCROLL_SENSITIVE
* @param resultSetConcurrency one of the following ResultSet constants:
* ResultSet.CONCUR_READ_ONLY or
* ResultSet.CONCUR_UPDATABLE
* @param resultSetHoldability one of the following ResultSet constants:
* ResultSet.HOLD_CURSORS_OVER_COMMIT or
* ResultSet.CLOSE_CURSORS_AT_COMMIT
* @return a new CallableStatement object, containing the pre-compiled SQL statement, that will
* generate ResultSet objects with the given type, concurrency, and holdability
* @throws SQLException if a database access error occurs, this method is called on a closed
* connection or the given parameters are not
* ResultSet constants indicating type, concurrency, and
* holdability
* @throws SQLFeatureNotSupportedException if the JDBC driver does not support this method or this method is not
* supported for the specified result set type, result set holdability and
* result set concurrency.
* @see ResultSet
* @since 1.4
*/
public CallableStatement prepareCall(final String sql,
final int resultSetType,
final int resultSetConcurrency,
final int resultSetHoldability) throws SQLException {
return prepareCall(sql);
}
private CallableStatement createNewCallableStatement(String query, String procedureName, boolean isFunction, String databaseAndProcedure,
String database, String arguments) throws SQLException {
if (arguments == null) {
arguments = "()";
}
if (isFunction) {
return new MariaDbFunctionStatement(this, database, databaseAndProcedure, arguments);
} else {
return new MariaDbProcedureStatement(query, this, procedureName, database);
}
}
@Override
public String nativeSQL(final String sql) throws SQLException {
return Utils.nativeSql(sql, noBackslashEscapes);
}
/**
* returns true if statements on this connection are auto commited.
*
* @return true if auto commit is on.
* @throws SQLException if there is an error
*/
public boolean getAutoCommit() throws SQLException {
return protocol.getAutocommit();
}
/**
* Sets whether this connection is auto commited.
*
* @param autoCommit if it should be auto commited.
* @throws SQLException if something goes wrong talking to the server.
*/
public void setAutoCommit(boolean autoCommit) throws SQLException {
if (autoCommit == getAutoCommit()) return;
try (Statement stmt = createStatement()) {
stmt.executeUpdate("set autocommit=" + ((autoCommit) ? "1" : "0"));
}
}
/**
* Sends commit to the server.
*
* @throws SQLException if there is an error commiting.
*/
public void commit() throws SQLException {
if (!getAutoCommit()) {
lock.lock();
try {
if (!getAutoCommit() && protocol.inTransaction()) {
try (Statement st = createStatement()) {
st.execute("COMMIT");
}
}
} finally {
lock.unlock();
}
}
}
/**
* Rolls back a transaction.
*
* @throws SQLException if there is an error rolling back.
*/
public void rollback() throws SQLException {
try (Statement st = createStatement()) {
st.execute("ROLLBACK");
}
}
/**
* Undoes all changes made after the given Savepoint object was set.
* This method should be used only when auto-commit has been disabled.
*
* @param savepoint the Savepoint object to roll back to
* @throws SQLException if a database access error occurs, this method is called while
* participating in a distributed transaction, this
* method is called on a closed connection, the Savepoint
* object is no longer valid, or this Connection object is
* currently in auto-commit mode
* @throws SQLFeatureNotSupportedException if the JDBC driver does not support this method
* @see Savepoint
* @see #rollback
* @since 1.4
*/
public void rollback(final Savepoint savepoint) throws SQLException {
try (Statement st = createStatement()) {
st.execute("ROLLBACK TO SAVEPOINT " + savepoint.toString());
}
}
/**
* close the connection.
*
* @throws SQLException if there is a problem talking to the server.
*/
public void close() throws SQLException {
if (pooledConnection != null) {
lock.lock();
try {
if (protocol != null && protocol.inTransaction()) {
/* Rollback transaction prior to returning physical connection to the pool */
rollback();
}
} finally {
lock.unlock();
}
pooledConnection.fireConnectionClosed();
return;
}
protocol.closeExplicit();
}
/**
* checks if the connection is closed.
*
* @return true if the connection is closed
* @throws SQLException if the connection cannot be closed.
*/
public boolean isClosed() throws SQLException {
return protocol.isClosed();
}
/**
* returns the meta data about the database.
*
* @return meta data about the db.
* @throws SQLException if there is a problem creating the meta data.
*/
public DatabaseMetaData getMetaData() throws SQLException {
return new MariaDbDatabaseMetaData(this, protocol.getUsername(), initialUrl);
}
/**
* Retrieves whether this Connection object is in read-only mode.
*
* @return true if this Connection object is read-only; false otherwise
* @throws SQLException SQLException if a database access error occurs or this method is called on a closed connection
*/
public boolean isReadOnly() throws SQLException {
return protocol.getReadonly();
}
/**
* Sets whether this connection is read only.
*
* @param readOnly true if it should be read only.
* @throws SQLException if there is a problem
*/
public void setReadOnly(final boolean readOnly) throws SQLException {
try {
logger.debug("setReadOnly to value " + readOnly);
protocol.setReadonly(readOnly);
} catch (SQLException e) {
ExceptionMapper.throwException(e, this, null);
}
}
/**
* Retrieves this Connection object's current catalog name.
*
* @return the current catalog name or null if there is none
* @throws SQLException if a database access error occurs or this method is called on a closed connection
* @see #setCatalog
*/
public String getCatalog() throws SQLException {
try (Statement st = createStatement()) {
try (ResultSet rs = st.executeQuery("select database()")) {
rs.next();
return rs.getString(1);
}
}
}
/**
* Sets the given catalog name in order to select a subspace of this Connection object's database in which to work.
* If the driver does not support catalogs, it will silently ignore this request.
* MySQL treats catalogs and databases as equivalent
*
* @param catalog the name of a catalog (subspace in this Connection object's database) in which to work
* @throws SQLException if a database access error occurs or this method is called on a closed connection
* @see #getCatalog
*/
public void setCatalog(final String catalog) throws SQLException {
if (catalog == null) {
throw new SQLException("The catalog name may not be null", "XAE05");
}
try {
protocol.setCatalog(catalog);
} catch (SQLException e) {
ExceptionMapper.throwException(e, this, null);
}
}
/**
* Retrieves this Connection object's current transaction isolation level.
*
* @return the current transaction isolation level, which will be one of the following constants:
* Connection.TRANSACTION_READ_UNCOMMITTED,
* Connection.TRANSACTION_READ_COMMITTED, Connection.TRANSACTION_REPEATABLE_READ,
* Connection.TRANSACTION_SERIALIZABLE, or Connection.TRANSACTION_NONE.
* @throws SQLException if a database access error occurs or this method is called on a closed connection
* @see #setTransactionIsolation
*/
public int getTransactionIsolation() throws SQLException {
try (Statement stmt = createStatement()) {
try (ResultSet rs = stmt.executeQuery("SELECT @@tx_isolation")) {
rs.next();
final String response = rs.getString(1);
if (response.equals("REPEATABLE-READ")) {
return Connection.TRANSACTION_REPEATABLE_READ;
}
if (response.equals("READ-UNCOMMITTED")) {
return Connection.TRANSACTION_READ_UNCOMMITTED;
}
if (response.equals("READ-COMMITTED")) {
return Connection.TRANSACTION_READ_COMMITTED;
}
if (response.equals("SERIALIZABLE")) {
return Connection.TRANSACTION_SERIALIZABLE;
}
}
}
throw ExceptionMapper.getSqlException("Could not get transaction isolation level");
}
/**
* Attempts to change the transaction isolation level for this Connection object to the one given.
* The constants defined in the interface Connection are the possible transaction isolation levels.
* Note: If this method is called during a transaction, the result is implementation-defined.
*
* @param level one of the following Connection constants:
* Connection.TRANSACTION_READ_UNCOMMITTED,
* Connection.TRANSACTION_READ_COMMITTED,
* Connection.TRANSACTION_REPEATABLE_READ, or
* Connection.TRANSACTION_SERIALIZABLE.
* (Note that Connection.TRANSACTION_NONE cannot be used because it specifies that
* transactions are not supported.)
* @throws SQLException if a database access error occurs, this method is called on a closed connection or the given
* parameter is not one
* of the Connection constants
* @see DatabaseMetaData#supportsTransactionIsolationLevel
* @see #getTransactionIsolation
*/
public void setTransactionIsolation(final int level) throws SQLException {
try {
protocol.setTransactionIsolation(level);
} catch (SQLException e) {
ExceptionMapper.throwException(e, this, null);
}
}
/**
* Retrieves the first warning reported by calls on this Connection object. If there is more than one warning, subsequent
* warnings will be chained to the first one and can be retrieved by calling the method SQLWarning.getNextWarning on the warning
* that was retrieved previously.
* This method may not be called on a closed connection; doing so will cause an SQLException to be thrown.
* Note: Subsequent warnings will be chained to this SQLWarning.
*
* @return the first SQLWarning object or null if there are none
* @throws SQLException if a database access error occurs or this method is called on a closed connection
* @see SQLWarning
*/
public SQLWarning getWarnings() throws SQLException {
if (warningsCleared || isClosed() || !protocol.hasWarnings()) return null;
SQLWarning last = null;
SQLWarning first = null;
try (Statement st = this.createStatement()) {
try (ResultSet rs = st.executeQuery("show warnings")) {
// returned result set has 'level', 'code' and 'message' columns, in this order.
while (rs.next()) {
int code = rs.getInt(2);
String message = rs.getString(3);
SQLWarning warning = new SQLWarning(message, ExceptionMapper.mapCodeToSqlState(code), code);
if (first == null) {
first = warning;
last = warning;
} else {
last.setNextWarning(warning);
last = warning;
}
}
}
}
return first;
}
/**
* Clears all warnings reported for this Connection object. After a call to this method, the method getWarnings returns
* null until a new warning is reported for this Connection object.
*
* @throws SQLException SQLException if a database access error occurs or this method is called on a closed connection
*/
public void clearWarnings() throws SQLException {
if (this.isClosed()) {
throw ExceptionMapper.getSqlException("Connection.clearWarnings cannot be called on a closed connection");
}
warningsCleared = true;
}
/**
* Reenable warnings, when next statement is executed.
*/
public void reenableWarnings() {
warningsCleared = false;
}
/**
* Retrieves the Map object associated with this Connection object. Unless the application has added an entry, the type
* map returned will be empty.
*
* @return the java.util.Map object associated with this Connection object
* @throws SQLException if a database access error occurs or this method is called on a closed connection
* @throws SQLFeatureNotSupportedException if the JDBC driver does not support this method
* @see #setTypeMap
* @since 1.2
*/
public Map> getTypeMap() throws SQLException {
return null;
}
/**
* Installs the given TypeMap object as the type map for this Connection object.
* The type map will be used for the
* custom mapping of SQL structured types and distinct types.
*
* @param map the java.util.Map object to install as the replacement for this Connection
* object's default type map
* @throws SQLException if a database access error occurs, this method is called on a closed
* connection or the given parameter is not a
* java.util.Map object
* @throws SQLFeatureNotSupportedException if the JDBC driver does not support this method
* @see #getTypeMap
*/
public void setTypeMap(final Map> map) throws SQLException {
throw ExceptionMapper.getFeatureNotSupportedException("Not yet supported");
}
/**
* Retrieves the current holdability of ResultSet objects created using this Connection
* object.
*
* @return the holdability, one of ResultSet.HOLD_CURSORS_OVER_COMMIT or
* ResultSet.CLOSE_CURSORS_AT_COMMIT
* @throws SQLException if a database access error occurs or this method is called on a closed connection
* @see #setHoldability
* @see DatabaseMetaData#getResultSetHoldability
* @see ResultSet
* @since 1.4
*/
public int getHoldability() throws SQLException {
return ResultSet.HOLD_CURSORS_OVER_COMMIT;
}
/**
* Changes the default holdability of ResultSet objects created using this Connection
* object to the given holdability.
* The default holdability of ResultSet objects can be be determined by invoking {@link
* DatabaseMetaData#getResultSetHoldability}.
*
* @param holdability a ResultSet holdability constant; one of
* ResultSet.HOLD_CURSORS_OVER_COMMIT or
* ResultSet.CLOSE_CURSORS_AT_COMMIT
* @throws SQLException if a database access occurs, this method is called on a closed
* connection, or the given parameter is not a
* ResultSet constant indicating holdability
* @throws SQLFeatureNotSupportedException if the given holdability is not supported
* @see #getHoldability
* @see DatabaseMetaData#getResultSetHoldability
* @see ResultSet
*/
@Override
public void setHoldability(final int holdability) throws SQLException {
}
/**
* Creates an unnamed savepoint in the current transaction and returns the new Savepoint object that
* represents it.
* if setSavepoint is invoked outside of an active transaction, a transaction will be started at this newly
* created savepoint.
*
* @return the new Savepoint object
* @throws SQLException if a database access error occurs, this method is called while
* participating in a distributed transaction, this method is called on a
* closed connection or this Connection object is currently in
* auto-commit mode
* @throws SQLFeatureNotSupportedException if the JDBC driver does not support this method
* @see Savepoint
* @since 1.4
*/
public Savepoint setSavepoint() throws SQLException {
return setSavepoint("unnamed");
}
/**
* Creates a savepoint with the given name in the current transaction and returns the new Savepoint
* object that represents it.
* if setSavepoint is invoked outside of an active transaction, a transaction will be started at this newly created
* savepoint.
*
* @param name a String containing the name of the savepoint
* @return the new Savepoint object
* @throws SQLException if a database access error occurs, this method is called while
* participating in a distributed transaction, this method is called on a
* closed connection or this Connection object is currently in
* auto-commit mode
* @throws SQLFeatureNotSupportedException if the JDBC driver does not support this method
* @see Savepoint
* @since 1.4
*/
public Savepoint setSavepoint(final String name) throws SQLException {
Savepoint savepoint = new MariaDbSavepoint(name, savepointCount++);
try (Statement st = createStatement()) {
st.execute("SAVEPOINT " + savepoint.toString());
}
return savepoint;
}
/**
* Removes the specified Savepoint and subsequent Savepoint objects from the current
* transaction. Any reference to the savepoint after it have been removed will cause an SQLException
* to be thrown.
*
* @param savepoint the Savepoint object to be removed
* @throws SQLException if a database access error occurs, this method is called on a closed
* connection or the given Savepoint object is not a valid
* savepoint in the current transaction
* @throws SQLFeatureNotSupportedException if the JDBC driver does not support this method
* @since 1.4
*/
public void releaseSavepoint(final Savepoint savepoint) throws SQLException {
try (Statement st = createStatement()) {
st.execute("RELEASE SAVEPOINT " + savepoint.toString());
}
}
/**
* Constructs an object that implements the Clob interface. The object returned initially contains no
* data. The setAsciiStream, setCharacterStream and setString methods of the
* Clob interface may be used to add data to the Clob.
*
* @return An object that implements the Clob interface
* @throws SQLException if an object that implements the Clob interface can not be
* constructed, this method is called on a
* closed connection or a database access error occurs.
* @throws SQLFeatureNotSupportedException if the JDBC driver does not support this data type
* @since 1.6
*/
public Clob createClob() throws SQLException {
return new MariaDbClob();
}
/**
* Constructs an object that implements the Blob interface. The object returned initially contains no
* data. The setBinaryStream and setBytes methods of the Blob interface may
* be used to add data to the Blob.
*
* @return An object that implements the Blob interface
* @throws SQLException if an object that implements the Blob interface can not be
* constructed, this method is called on a
* closed connection or a database access error occurs.
* @throws SQLFeatureNotSupportedException if the JDBC driver does not support this data type
* @since 1.6
*/
public Blob createBlob() throws SQLException {
return new MariaDbBlob();
}
/**
* Constructs an object that implements the NClob interface. The object returned initially contains no
* data. The setAsciiStream, setCharacterStream and setString methods of the
* NClob interface may be used to add data to the NClob.
*
* @return An object that implements the NClob interface
* @throws SQLException if an object that implements the NClob interface can not be
* constructed, this method is called on a
* closed connection or a database access error occurs.
* @throws SQLFeatureNotSupportedException if the JDBC driver does not support this data type
* @since 1.6
*/
public NClob createNClob() throws SQLException {
return new MariaDbClob();
}
/**
* Constructs an object that implements the SQLXML interface. The object returned initially contains no
* data. The createXmlStreamWriter object and setString method of the SQLXML
* interface may be used to add data to the SQLXML object.
*
* @return An object that implements the SQLXML interface
* @throws SQLException if an object that implements the SQLXML interface can not be
* constructed, this method is called on a
* closed connection or a database access error occurs.
* @throws SQLFeatureNotSupportedException if the JDBC driver does not support this data type
* @since 1.6
*/
@Override
public SQLXML createSQLXML() throws SQLException {
throw ExceptionMapper.getFeatureNotSupportedException("Not supported");
}
/**
* Returns true if the connection has not been closed and is still valid. The driver shall submit a query on the
* connection or use some other mechanism that positively verifies the connection is still valid when this method
* is called.
* The query submitted by the driver to validate the connection shall be executed in the context of the current
* transaction.
*
* @param timeout - The time in seconds to wait for the database operation used to validate the connection to
* complete. If the timeout period expires before the operation completes, this method returns
* false. A value of 0 indicates a timeout is not applied to thedatabase operation.
* @return true if the connection is valid, false otherwise
* @throws SQLException if the value supplied for timeout is less then 0
* @see DatabaseMetaData#getClientInfoProperties
* @since 1.6
*/
public boolean isValid(final int timeout) throws SQLException {
if (timeout < 0) {
throw new SQLException("the value supplied for timeout is negative");
}
if (isClosed()) return false;
try {
return protocol.ping();
} catch (SQLException e) {
return false;
}
}
/**
* Sets the value of the connection's client info properties. The Properties object contains the
* names and values of the client info properties to be set. The set of client info properties contained in the
* properties list replaces the current set of client info properties on the connection. If a property that is
* currently set on the connection is not present in the properties list, that property is
* cleared. Specifying an empty properties list will clear all of the properties on the connection. See
* setClientInfo (String, String) for more information.
* If an error occurs in setting any of the client info properties, a SQLClientInfoException is
* thrown. The SQLClientInfoException contains information indicating which client info properties
* were not set. The state of the client information is unknown because some databases do not allow multiple
* client info properties to be set atomically. For those databases, one or
* more properties may have been set before the error occurred.
*
* @param properties the list of client info properties to set
* @throws SQLClientInfoException if the database server returns an error while setting the clientInfo values on the
* database server or
* this method is called on a closed connection
* @see Connection#setClientInfo(String, String) setClientInfo(String, String)
* @since 1.6
*/
public void setClientInfo(final Properties properties) throws SQLClientInfoException {
Map propertiesExceptions = new HashMap<>();
for (String name : new String[]{"ApplicationName", "ClientUser", "ClientHostname"}) {
try {
setClientInfo(name, properties.getProperty(name));
} catch (SQLClientInfoException e) {
propertiesExceptions.putAll(e.getFailedProperties());
}
}
if (!propertiesExceptions.isEmpty()) {
String errorMsg = "setClientInfo errors : the following properties where not set : " + propertiesExceptions.keySet();
throw new SQLClientInfoException(errorMsg, propertiesExceptions);
}
}
/**
* Sets the value of the client info property specified by name to the value specified by value.
* Applications may use the DatabaseMetaData.getClientInfoProperties method to determine the client info properties supported by
* the driver and the maximum length that may be specified for each property.
* The driver stores the value specified in a suitable location in the database. For example in a special register, session parameter, or
* system table column. For efficiency the driver may defer setting the value in the database until the next time a statement is executed or
* prepared. Other than storing the client information in the appropriate place in the database, these methods shall not alter the behavior of
* the connection in anyway. The values supplied to these methods are used for accounting, diagnostics and debugging purposes only.
* The driver shall generate a warning if the client info name specified is not recognized by the driver.
* If the value specified to this method is greater than the maximum length for the property the driver may either truncate the value and
* generate a warning or generate a SQLClientInfoException. If the driver generates a SQLClientInfoException, the
* value specified was not set on the connection.
* The following are standard client info properties. Drivers are not required to support these properties however if the driver supports a
* client info property that can be described by one of the standard properties, the standard property name should be used.
* - ApplicationName - The name of the application currently utilizing the connection
- ClientUser - The
* name of the user that the application using the connection is performing work for. This may not be the same as the user name that was used in
* establishing the connection.
- ClientHostname - The hostname of the computer the application using the connection is running
* on.
*
* @param name The name of the client info property to set
* @param value The value to set the client info property to. If the value is null, the current value of the specified property is cleared.
* @throws SQLClientInfoException if the database server returns an error while setting the client info value on the database server or
* this method is called on a closed connection
* @since 1.6
*/
public void setClientInfo(final String name, final String value) throws SQLClientInfoException {
if (protocol.isExplicitClosed()) {
Map failures = new HashMap<>();
failures.put(name, ClientInfoStatus.REASON_UNKNOWN);
throw new SQLClientInfoException("setClientInfo() is called on closed connection", failures);
}
if (protocol.isClosed() && protocol.getProxy() != null) {
lock.lock();
try {
protocol.getProxy().reconnect();
} catch (SQLException sqle) {
Map failures = new HashMap<>();
failures.put(name, ClientInfoStatus.REASON_UNKNOWN);
throw new SQLClientInfoException("Connection closed", failures, sqle);
} finally {
lock.unlock();
}
}
if (name == null || (!"ApplicationName".equals(name)
&& !"ClientUser".equals(name)
&& !"ClientHostname".equals(name))) {
Map failures = new HashMap<>();
failures.put(name, ClientInfoStatus.REASON_UNKNOWN_PROPERTY);
throw new SQLClientInfoException("setClientInfo() parameters can only be \"ApplicationName\",\"ClientUser\" or \"ClientHostname\", "
+ "but was : " + name, failures);
}
StringBuilder escapeQuery = new StringBuilder("SET @").append(name).append("=");
if (value == null) {
escapeQuery.append("null");
} else {
escapeQuery.append("'");
int charsOffset = 0;
int charsLength = value.length();
char charValue;
if (noBackslashEscapes) {
while (charsOffset < charsLength) {
charValue = value.charAt(charsOffset);
if (charValue == '\'') escapeQuery.append('\''); //add a single escape quote
escapeQuery.append(charValue);
charsOffset++;
}
} else {
while (charsOffset < charsLength) {
charValue = value.charAt(charsOffset);
if (charValue == '\''
|| charValue == '\\'
|| charValue == '"'
|| charValue == 0) escapeQuery.append('\\'); //add escape slash
escapeQuery.append(charValue);
charsOffset++;
}
}
escapeQuery.append("'");
}
try {
Statement statement = createStatement();
statement.execute(escapeQuery.toString());
} catch (SQLException sqle) {
Map failures = new HashMap<>();
failures.put(name, ClientInfoStatus.REASON_UNKNOWN);
throw new SQLClientInfoException("unexpected error during setClientInfo", failures, sqle);
}
}
/**
* Returns a list containing the name and current value of each client info property supported by the driver. The value of a client info property
* may be null if the property has not been set and does not have a default value.
*
* @return A Properties object that contains the name and current value of each of the client info properties supported by the
* driver.
* @throws SQLException if the database server returns an error when fetching the client info values from the database or this method is
* called on a closed connection
* @since 1.6
*/
public Properties getClientInfo() throws SQLException {
checkConnection();
try (Statement statement = createStatement()) {
try (ResultSet rs = statement.executeQuery("SELECT @ApplicationName, @ClientUser, @ClientHostname")) {
if (rs.next()) {
Properties properties = new Properties();
if (rs.getString(1) != null) properties.setProperty("ApplicationName", rs.getString(1));
if (rs.getString(2) != null) properties.setProperty("ClientUser", rs.getString(2));
if (rs.getString(3) != null) properties.setProperty("ClientHostname", rs.getString(3));
return properties;
}
}
}
Properties properties = new Properties();
properties.setProperty("ApplicationName", null);
properties.setProperty("ClientUser", null);
properties.setProperty("ClientHostname", null);
return new Properties();
}
/**
* Returns the value of the client info property specified by name. This method may return null if the specified client info property has not
* been set and does not have a default value. This method will also return null if the specified client info property name is not supported by
* the driver.
* Applications may use the DatabaseMetaData.getClientInfoProperties method to determine the client info properties supported by the
* driver.
*
* @param name The name of the client info property to retrieve
* @return The value of the client info property specified
* @throws SQLException if the database server returns an error when fetching the client info value from the database or this method is
* called on a closed connection
* @see DatabaseMetaData#getClientInfoProperties
* @since 1.6
*/
public String getClientInfo(final String name) throws SQLException {
checkConnection();
if (!"ApplicationName".equals(name) && !"ClientUser".equals(name) && !"ClientHostname".equals(name)) {
throw new SQLException("name must be \"ApplicationName\", \"ClientUser\" or \"ClientHostname\", but was \"" + name + "\"");
}
try (Statement statement = createStatement()) {
try (ResultSet rs = statement.executeQuery("SELECT @" + name)) {
if (rs.next()) {
return rs.getString(1);
}
}
}
return null;
}
/**
* Factory method for creating Array objects.
* Note: When createArrayOf is used to create an array object that maps to a primitive data type, then it is
* implementation-defined whether the Array object is an array of that primitive data type or an array of Object.
* Note: The JDBC driver is responsible for mapping the elements Object array to the default JDBC SQL type defined in
* java.sql.Types for the given class of Object. The default mapping is specified in Appendix B of the JDBC specification. If the
* resulting JDBC type is not the appropriate type for the given typeName then it is implementation defined whether an SQLException
* is thrown or the driver supports the resulting conversion.
*
* @param typeName the SQL name of the type the elements of the array map to. The typeName is a database-specific name which may be the name of a
* built-in type, a user-defined type or a standard SQL type supported by this database. This is the value returned by
* Array.getBaseTypeName
* @param elements the elements that populate the returned object
* @return an Array object whose elements map to the specified SQL type
* @throws SQLException if a database error occurs, the JDBC type is not appropriate for the typeName and the conversion is not
* supported, the typeName is null or this method is called on a closed connection
* @throws SQLFeatureNotSupportedException if the JDBC driver does not support this data type
* @since 1.6
*/
public Array createArrayOf(final String typeName, final Object[] elements) throws SQLException {
throw ExceptionMapper.getFeatureNotSupportedException("Not yet supported");
}
/**
* Factory method for creating Struct objects.
*
* @param typeName the SQL type name of the SQL structured type that this Struct object maps to. The typeName is the name of a
* user-defined type that has been defined for this database. It is the value returned by Struct.getSQLTypeName.
* @param attributes the attributes that populate the returned object
* @return a Struct object that maps to the given SQL type and is populated with the given attributes
* @throws SQLException if a database error occurs, the typeName is null or this method is called on a closed connection
* @throws SQLFeatureNotSupportedException if the JDBC driver does not support this data type
* @since 1.6
*/
public Struct createStruct(final String typeName, final Object[] attributes) throws SQLException {
throw ExceptionMapper.getFeatureNotSupportedException("Not yet supported");
}
/**
* Returns an object that implements the given interface to allow access to non-standard methods, or standard methods not exposed by the proxy.
* If the receiver implements the interface then the result is the receiver or a proxy for the receiver. If the receiver is a wrapper and the
* wrapped object implements the interface then the result is the wrapped object or a proxy for the wrapped object. Otherwise return the the
* result of calling unwrap recursively on the wrapped object or a proxy for that result. If the receiver is not a wrapper and does
* not implement the interface, then an SQLException is thrown.
*
* @param iface A Class defining an interface that the result must implement.
* @return an object that implements the interface. May be a proxy for the actual implementing object.
* @throws SQLException If no object found that implements the interface
* @since 1.6
*/
public T unwrap(final Class iface) throws SQLException {
try {
if (isWrapperFor(iface)) {
return iface.cast(this);
} else {
throw new SQLException("The receiver is not a wrapper for " + iface.getName());
}
} catch (Exception e) {
throw new SQLException("The receiver is not a wrapper and does not implement the interface");
}
}
/**
* Returns true if this either implements the interface argument or is directly or indirectly a wrapper for an object that does. Returns false
* otherwise. If this implements the interface then return true, else if this is a wrapper then return the result of recursively calling
* isWrapperFor on the wrapped object. If this does not implement the interface and is not a wrapper, return false. This method
* should be implemented as a low-cost operation compared to unwrap so that callers can use this method to avoid expensive
* unwrap calls that may fail. If this method returns true then calling unwrap with the same argument should succeed.
*
* @param iface a Class defining an interface.
* @return true if this implements the interface or directly or indirectly wraps an object that does.
* @throws SQLException if an error occurs while determining whether this is a wrapper for an object with the given interface.
* @since 1.6
*/
public boolean isWrapperFor(final Class iface) throws SQLException {
return iface.isInstance(this);
}
/**
* returns the username for the connection.
*
* @return the username.
*/
public String getUsername() {
return protocol.getUsername();
}
/**
* returns the password for the connection.
*
* @return the password.
*/
public String getPassword() {
return protocol.getPassword();
}
/**
* returns the hostname for the connection.
*
* @return the hostname.
*/
public String getHostname() {
return protocol.getHost();
}
/**
* returns the port for the connection.
*
* @return the port
*/
public int getPort() {
return protocol.getPort();
}
/**
* returns the database.
*
* @return the database
*/
public String getDatabase() {
return protocol.getDatabase();
}
protected boolean getPinGlobalTxToPhysicalConnection() {
return protocol.getPinGlobalTxToPhysicalConnection();
}
/**
* If failover is not activated, will close connection when a connection error occur.
*/
public void setHostFailed() {
if (protocol.getProxy() == null) {
protocol.setHostFailedWithoutProxy();
}
}
/**
* Are table case sensitive or not . Default Value: 0 (Unix), 1 (Windows), 2 (Mac OS X). If set to 0 (the default on Unix-based systems), table
* names and aliases and database names are compared in a case-sensitive manner. If set to 1 (the default on Windows), names are stored in
* lowercase and not compared in a case-sensitive manner. If set to 2 (the default on Mac OS X), names are stored as declared, but compared in
* lowercase.
*
* @return int value.
* @throws SQLException if a connection error occur
*/
public int getLowercaseTableNames() throws SQLException {
if (lowercaseTableNames == -1) {
try (Statement st = createStatement()) {
try (ResultSet rs = st.executeQuery("select @@lower_case_table_names")) {
rs.next();
lowercaseTableNames = rs.getInt(1);
}
}
}
return lowercaseTableNames;
}
/**
* Abort connection.
*
* @param executor executor
* @throws SQLException if security manager doesn't permit it.
*/
public void abort(Executor executor) throws SQLException {
if (this.isClosed()) return;
SQLPermission sqlPermission = new SQLPermission("callAbort");
SecurityManager securityManager = System.getSecurityManager();
if (securityManager != null && sqlPermission != null) {
securityManager.checkPermission(sqlPermission);
}
if (executor == null) {
throw ExceptionMapper.getSqlException("Cannot abort the connection: null executor passed");
}
executor.execute(new Runnable() {
@Override
public void run() {
try {
close();
pooledConnection = null;
} catch (SQLException sqle) {
throw new RuntimeException(sqle);
}
}
});
}
/**
* Get network timeout.
*
* @return timeout
* @throws SQLException if database socket error occur
*/
public int getNetworkTimeout() throws SQLException {
try {
return this.protocol.getTimeout();
} catch (SocketException se) {
throw ExceptionMapper.getSqlException("Cannot retrieve the network timeout", se);
}
}
public String getSchema() throws SQLException {
// We support only catalog
return null;
}
public void setSchema(String arg0) throws SQLException {
// We support only catalog, and JDBC indicate "If the driver does not support schemas, it will silently ignore this request."
}
/**
* Change network timeout
*
* @param executor executor (can be null)
* @param milliseconds network timeout in milliseconds.
* @throws SQLException if security manager doesn't permit it.
*/
public void setNetworkTimeout(Executor executor, final int milliseconds) throws SQLException {
if (this.isClosed()) {
throw ExceptionMapper.getSqlException("Connection.setNetworkTimeout cannot be called on a closed connection");
}
if (milliseconds < 0) {
throw ExceptionMapper.getSqlException("Connection.setNetworkTimeout cannot be called with a negative timeout");
}
SQLPermission sqlPermission = new SQLPermission("setNetworkTimeout");
SecurityManager securityManager = System.getSecurityManager();
if (securityManager != null && sqlPermission != null) {
securityManager.checkPermission(sqlPermission);
}
try {
protocol.setTimeout(milliseconds);
} catch (SocketException se) {
throw ExceptionMapper.getSqlException("Cannot set the network timeout", se);
}
}
protected String getServerTimezone() {
return options.serverTimezone;
}
protected Options getOptions() {
return options;
}
public ClientPrepareStatementCache getClientPrepareStatementCache() {
return clientPrepareStatementCache;
}
public long getServerThreadId() {
return (protocol != null) ? protocol.getServerThreadId() : -1;
}
public boolean canUseServerTimeout() {
return canUseServerTimeout;
}
}