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package org.sqlite.jdbc3;
import java.sql.CallableStatement;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.SQLFeatureNotSupportedException;
import java.sql.SQLWarning;
import java.sql.Savepoint;
import java.sql.Statement;
import java.sql.Struct;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.atomic.AtomicInteger;
import org.sqlite.SQLiteConfig;
import org.sqlite.SQLiteConfig.TransactionMode;
import org.sqlite.SQLiteConnection;
import org.sqlite.SQLiteOpenMode;
public abstract class JDBC3Connection extends SQLiteConnection {
private final AtomicInteger savePoint = new AtomicInteger(0);
private Map> typeMap;
private boolean readOnly = false;
protected JDBC3Connection(String url, String fileName, Properties prop) throws SQLException {
super(url, fileName, prop);
}
/**
* This will try to enforce the transaction mode if SQLiteConfig#isExplicitReadOnly is true and
* auto commit is disabled.
*
*
*
If this connection is read only, the PRAGMA query_only will be set
*
If this connection is not read only:
*
*
if no statement has been executed, PRAGMA query_only will be set to false, and an
* IMMEDIATE transaction will be started
*
if a statement has already been executed, an exception is thrown
*
*
*
* @throws SQLException if a statement has already been executed on this connection, then the
* transaction cannot be upgraded to write
*/
@SuppressWarnings("deprecation")
public void tryEnforceTransactionMode() throws SQLException {
// important note: read-only mode is only supported when auto-commit is disabled
if (getDatabase().getConfig().isExplicitReadOnly()
&& !this.getAutoCommit()
&& this.getCurrentTransactionMode() != null) {
if (isReadOnly()) {
// this is a read-only transaction, make sure all writing operations are rejected by
// the DB
// (note: this pragma is evaluated on a per-transaction basis by SQLite)
getDatabase()._exec("PRAGMA query_only = true;");
} else {
if (getCurrentTransactionMode() == TransactionMode.DEFERRED) {
if (isFirstStatementExecuted()) {
// first statement was already executed; cannot upgrade to write
// transaction!
throw new SQLException(
"A statement has already been executed on this connection; cannot upgrade to write transaction");
} else {
// this is the first statement in the transaction; close and create an
// immediate one
getDatabase()._exec("commit; /* need to explicitly upgrade transaction */");
// start the write transaction
getDatabase()._exec("PRAGMA query_only = false;");
getDatabase()
._exec("BEGIN IMMEDIATE; /* explicitly upgrade transaction */");
setCurrentTransactionMode(TransactionMode.IMMEDIATE);
}
}
}
}
}
/** @see java.sql.Connection#getCatalog() */
public String getCatalog() throws SQLException {
checkOpen();
return null;
}
/** @see java.sql.Connection#setCatalog(java.lang.String) */
public void setCatalog(String catalog) throws SQLException {
checkOpen();
}
/** @see java.sql.Connection#getHoldability() */
public int getHoldability() throws SQLException {
checkOpen();
return ResultSet.CLOSE_CURSORS_AT_COMMIT;
}
/** @see java.sql.Connection#setHoldability(int) */
public void setHoldability(int h) throws SQLException {
checkOpen();
if (h != ResultSet.CLOSE_CURSORS_AT_COMMIT) {
throw new SQLException("SQLite only supports CLOSE_CURSORS_AT_COMMIT");
}
}
/** @see java.sql.Connection#getTypeMap() */
public Map> getTypeMap() throws SQLException {
synchronized (this) {
if (this.typeMap == null) {
this.typeMap = new HashMap>();
}
return this.typeMap;
}
}
/** @see java.sql.Connection#setTypeMap(java.util.Map) */
public void setTypeMap(Map map) throws SQLException {
synchronized (this) {
this.typeMap = map;
}
}
/** @see java.sql.Connection#isReadOnly() */
public boolean isReadOnly() {
SQLiteConfig config = getDatabase().getConfig();
return (
// the entire database is read-only
((config.getOpenModeFlags() & SQLiteOpenMode.READONLY.flag) != 0)
// the flag was set explicitly by the user on this connection
|| (config.isExplicitReadOnly() && this.readOnly));
}
/** @see java.sql.Connection#setReadOnly(boolean) */
public void setReadOnly(boolean ro) throws SQLException {
if (getDatabase().getConfig().isExplicitReadOnly()) {
if (ro != readOnly && isFirstStatementExecuted()) {
throw new SQLException(
"Cannot change Read-Only status of this connection: the first statement was"
+ " already executed and the transaction is open.");
}
} else {
// trying to change read-only flag
if (ro != isReadOnly()) {
throw new SQLException(
"Cannot change read-only flag after establishing a connection."
+ " Use SQLiteConfig#setReadOnly and SQLiteConfig.createConnection().");
}
}
this.readOnly = ro;
}
/** @see java.sql.Connection#nativeSQL(java.lang.String) */
public String nativeSQL(String sql) {
return sql;
}
/** @see java.sql.Connection#clearWarnings() */
public void clearWarnings() throws SQLException {}
/** @see java.sql.Connection#getWarnings() */
public SQLWarning getWarnings() throws SQLException {
return null;
}
/** @see java.sql.Connection#createStatement() */
public Statement createStatement() throws SQLException {
return createStatement(
ResultSet.TYPE_FORWARD_ONLY,
ResultSet.CONCUR_READ_ONLY,
ResultSet.CLOSE_CURSORS_AT_COMMIT);
}
/** @see java.sql.Connection#createStatement(int, int) */
public Statement createStatement(int rsType, int rsConcurr) throws SQLException {
return createStatement(rsType, rsConcurr, ResultSet.CLOSE_CURSORS_AT_COMMIT);
}
/** @see java.sql.Connection#createStatement(int, int, int) */
public abstract Statement createStatement(int rst, int rsc, int rsh) throws SQLException;
/** @see java.sql.Connection#prepareCall(java.lang.String) */
public CallableStatement prepareCall(String sql) throws SQLException {
return prepareCall(
sql,
ResultSet.TYPE_FORWARD_ONLY,
ResultSet.CONCUR_READ_ONLY,
ResultSet.CLOSE_CURSORS_AT_COMMIT);
}
/** @see java.sql.Connection#prepareCall(java.lang.String, int, int) */
public CallableStatement prepareCall(String sql, int rst, int rsc) throws SQLException {
return prepareCall(sql, rst, rsc, ResultSet.CLOSE_CURSORS_AT_COMMIT);
}
/** @see java.sql.Connection#prepareCall(java.lang.String, int, int, int) */
public CallableStatement prepareCall(String sql, int rst, int rsc, int rsh)
throws SQLException {
throw new SQLException("SQLite does not support Stored Procedures");
}
/** @see java.sql.Connection#prepareStatement(java.lang.String) */
public PreparedStatement prepareStatement(String sql) throws SQLException {
return prepareStatement(sql, ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY);
}
/** @see java.sql.Connection#prepareStatement(java.lang.String, int) */
public PreparedStatement prepareStatement(String sql, int autoC) throws SQLException {
return prepareStatement(sql);
}
/** @see java.sql.Connection#prepareStatement(java.lang.String, int[]) */
public PreparedStatement prepareStatement(String sql, int[] colInds) throws SQLException {
return prepareStatement(sql);
}
/** @see java.sql.Connection#prepareStatement(java.lang.String, java.lang.String[]) */
public PreparedStatement prepareStatement(String sql, String[] colNames) throws SQLException {
return prepareStatement(sql);
}
/** @see java.sql.Connection#prepareStatement(java.lang.String, int, int) */
public PreparedStatement prepareStatement(String sql, int rst, int rsc) throws SQLException {
return prepareStatement(sql, rst, rsc, ResultSet.CLOSE_CURSORS_AT_COMMIT);
}
/** @see java.sql.Connection#prepareStatement(java.lang.String, int, int, int) */
public abstract PreparedStatement prepareStatement(String sql, int rst, int rsc, int rsh)
throws SQLException;
/** @see java.sql.Connection#setSavepoint() */
public Savepoint setSavepoint() throws SQLException {
checkOpen();
if (getAutoCommit()) {
// when a SAVEPOINT is the outermost savepoint and not
// with a BEGIN...COMMIT then the behavior is the same
// as BEGIN DEFERRED TRANSACTION
// https://www.sqlite.org/lang_savepoint.html
getConnectionConfig().setAutoCommit(false);
}
Savepoint sp = new JDBC3Savepoint(savePoint.incrementAndGet());
getDatabase().exec(String.format("SAVEPOINT %s", sp.getSavepointName()), false);
return sp;
}
/** @see java.sql.Connection#setSavepoint(java.lang.String) */
public Savepoint setSavepoint(String name) throws SQLException {
checkOpen();
if (getAutoCommit()) {
// when a SAVEPOINT is the outermost savepoint and not
// with a BEGIN...COMMIT then the behavior is the same
// as BEGIN DEFERRED TRANSACTION
// https://www.sqlite.org/lang_savepoint.html
getConnectionConfig().setAutoCommit(false);
}
Savepoint sp = new JDBC3Savepoint(savePoint.incrementAndGet(), name);
getDatabase().exec(String.format("SAVEPOINT %s", sp.getSavepointName()), false);
return sp;
}
/** @see java.sql.Connection#releaseSavepoint(java.sql.Savepoint) */
public void releaseSavepoint(Savepoint savepoint) throws SQLException {
checkOpen();
if (getAutoCommit()) {
throw new SQLException("database in auto-commit mode");
}
getDatabase()
.exec(String.format("RELEASE SAVEPOINT %s", savepoint.getSavepointName()), false);
}
/** @see java.sql.Connection#rollback(java.sql.Savepoint) */
public void rollback(Savepoint savepoint) throws SQLException {
checkOpen();
if (getAutoCommit()) {
throw new SQLException("database in auto-commit mode");
}
getDatabase()
.exec(
String.format("ROLLBACK TO SAVEPOINT %s", savepoint.getSavepointName()),
getAutoCommit());
}
public Struct createStruct(String t, Object[] attr) throws SQLException {
throw new SQLFeatureNotSupportedException("not implemented by SQLite JDBC driver");
}
}
