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JDBC Driver for the Firebird RDBMS
/*
* Firebird Open Source JDBC Driver
*
* Distributable under LGPL license.
* You may obtain a copy of the License at http://www.gnu.org/copyleft/lgpl.html
*
* This program 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
* LGPL License for more details.
*
* This file was created by members of the firebird development team.
* All individual contributions remain the Copyright (C) of those
* individuals. Contributors to this file are either listed here or
* can be obtained from a source control history command.
*
* All rights reserved.
*/
package org.firebirdsql.jdbc;
import org.firebirdsql.gds.impl.GDSFactory;
import org.firebirdsql.gds.impl.GDSHelper;
import org.firebirdsql.gds.impl.GDSType;
import org.firebirdsql.gds.ng.LockCloseable;
import org.firebirdsql.jaybird.Version;
import org.firebirdsql.jdbc.escape.FBEscapedFunctionHelper;
import org.firebirdsql.jdbc.metadata.*;
import org.firebirdsql.logging.Logger;
import org.firebirdsql.logging.LoggerFactory;
import org.firebirdsql.util.FirebirdSupportInfo;
import java.nio.charset.StandardCharsets;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.sql.*;
import java.util.*;
import static org.firebirdsql.jdbc.metadata.FbMetadataConstants.*;
import static org.firebirdsql.util.FirebirdSupportInfo.supportInfoFor;
/**
* Comprehensive information about the database as a whole.
*
* @author David Jencks
* @author Mark Rotteveel
*/
@SuppressWarnings("RedundantThrows")
public class FBDatabaseMetaData implements FirebirdDatabaseMetaData {
private final static Logger log = LoggerFactory.getLogger(FBDatabaseMetaData.class);
private final GDSHelper gdsHelper;
private final FBConnection connection;
private final FirebirdSupportInfo firebirdSupportInfo;
private static final int STATEMENT_CACHE_SIZE = 12;
private final Map statements = new LruPreparedStatementCache(STATEMENT_CACHE_SIZE);
private final FirebirdVersionMetaData versionMetaData;
protected FBDatabaseMetaData(FBConnection c) throws SQLException {
this.gdsHelper = c.getGDSHelper();
this.connection = c;
firebirdSupportInfo = supportInfoFor(c);
versionMetaData = FirebirdVersionMetaData.getVersionMetaDataFor(c);
}
@Override
public void close() {
try (LockCloseable ignored = connection.withLock()) {
if (statements.isEmpty()) {
return;
}
try {
for (FBStatement stmt : statements.values()) {
try {
stmt.close();
} catch (Exception e) {
log.warnDebug("error closing cached statements in DatabaseMetaData.close", e);
}
}
} finally {
statements.clear();
}
}
}
@Override
public boolean allProceduresAreCallable() throws SQLException {
//returns all procedures whether or not you have execute permission
return false;
}
@Override
public boolean allTablesAreSelectable() throws SQLException {
//returns all tables matching criteria independent of access permissions.
return false;
}
@Override
public String getURL() throws SQLException {
// TODO Think of a less complex way to obtain the url or just return null?
GDSType gdsType = getGDSType();
return GDSFactory.getJdbcUrl(gdsType, gdsHelper.getConnectionProperties());
}
private GDSType getGDSType() {
return connection.mc.getManagedConnectionFactory().getGDSType();
}
@Override
public String getUserName() throws SQLException {
return gdsHelper.getUserName();
}
@Override
public boolean isReadOnly() throws SQLException {
return false;//could be true, not yetimplemented
}
@Override
public boolean nullsAreSortedHigh() throws SQLException {
// in Firebird 1.5.x NULLs are always sorted at the end
// in Firebird 2.0.x NULLs are sorted low
return false;
}
@Override
public boolean nullsAreSortedLow() throws SQLException {
// in Firebird 1.5.x NULLs are always sorted at the end
// in Firebird 2.0.x NULLs are sorted low
return gdsHelper.compareToVersion(2, 0) >= 0;
}
@Override
public boolean nullsAreSortedAtStart() throws SQLException {
// in Firebird 1.5.x NULLs are always sorted at the end
// in Firebird 2.0.x NULLs are sorted low
return false;
}
@Override
public boolean nullsAreSortedAtEnd() throws SQLException {
// in Firebird 1.5.x NULLs are always sorted at the end
// in Firebird 2.0.x NULLs are sorted low
return gdsHelper.compareToVersion(2, 0) < 0;
}
@Override
public String getDatabaseProductName() throws SQLException {
return gdsHelper.getDatabaseProductName();
}
@Override
public String getDatabaseProductVersion() throws SQLException {
return gdsHelper.getDatabaseProductVersion();
}
@Override
public String getDriverName() throws SQLException {
// Retain JCA in name for compatibility with tools that consult metadata and use this string
return "Jaybird JCA/JDBC driver";
}
@Override
public String getDriverVersion() throws SQLException {
return Version.JAYBIRD_SIMPLE_VERSION;
}
@Override
public int getDriverMajorVersion() {
return Version.JAYBIRD_MAJOR_VERSION;
}
@Override
public int getDriverMinorVersion() {
return Version.JAYBIRD_MINOR_VERSION;
}
@Override
public boolean usesLocalFiles() throws SQLException {
return false;
}
@Override
public boolean usesLocalFilePerTable() throws SQLException {
return false;
}
@Override
public boolean supportsMixedCaseIdentifiers() throws SQLException {
return false;
}
// TODO implement statement pooling on the server.. then in the driver
@Override
public boolean supportsStatementPooling() throws SQLException {
return false;
}
@Override
public boolean locatorsUpdateCopy() throws SQLException {
// Firebird creates a new blob when making changes
return true;
}
@Override
public boolean storesUpperCaseIdentifiers() throws SQLException {
return true;
}
@Override
public boolean storesLowerCaseIdentifiers() throws SQLException {
return false;
}
@Override
public boolean storesMixedCaseIdentifiers() throws SQLException {
return false;
}
@Override
public boolean supportsMixedCaseQuotedIdentifiers() throws SQLException {
return true;
}
@Override
public boolean storesUpperCaseQuotedIdentifiers() throws SQLException {
return false;
}
@Override
public boolean storesLowerCaseQuotedIdentifiers() throws SQLException {
return false;
}
@Override
public boolean storesMixedCaseQuotedIdentifiers() throws SQLException {
return false;
}
@Override
public String getIdentifierQuoteString() throws SQLException {
return getConnectionDialect() == 1 ? " " : "\"";
}
@Override
public String getSQLKeywords() throws SQLException {
return versionMetaData.getSqlKeywords();
}
/**
* {@inheritDoc}
*
* NOTE: Some of the functions listed may only work on Firebird 2.1 or higher, or when equivalent UDFs
* are installed.
*
*/
@Override
public String getNumericFunctions() throws SQLException {
return collectionToCommaSeparatedList(FBEscapedFunctionHelper.getSupportedNumericFunctions());
}
private static String collectionToCommaSeparatedList(Collection collection) {
StringBuilder sb = new StringBuilder();
for (String item : collection) {
sb.append(item);
sb.append(',');
}
sb.setLength(sb.length() - 1);
return sb.toString();
}
/**
* {@inheritDoc}
*
* NOTE: Some of the functions listed may only work on Firebird 2.1 or higher, or when equivalent UDFs
* are installed.
*
*/
@Override
public String getStringFunctions() throws SQLException {
return collectionToCommaSeparatedList(FBEscapedFunctionHelper.getSupportedStringFunctions());
}
/**
* {@inheritDoc}
*
* NOTE: Some of the functions listed may only work on Firebird 2.1 or higher, or when equivalent UDFs
* are installed.
*
*/
@Override
public String getSystemFunctions() throws SQLException {
return collectionToCommaSeparatedList(FBEscapedFunctionHelper.getSupportedSystemFunctions());
}
/**
* {@inheritDoc}
*
* NOTE: Some of the functions listed may only work on Firebird 2.1 or higher, or when equivalent UDFs
* are installed.
*
*/
@Override
public String getTimeDateFunctions() throws SQLException {
return collectionToCommaSeparatedList(FBEscapedFunctionHelper.getSupportedTimeDateFunctions());
}
@Override
public String getSearchStringEscape() throws SQLException {
return "\\";
}
@Override
public String getExtraNameCharacters() throws SQLException {
return "$";
}
@Override
public boolean supportsAlterTableWithAddColumn() throws SQLException {
return true;
}
@Override
public boolean supportsAlterTableWithDropColumn() throws SQLException {
return true;
}
@Override
public boolean supportsColumnAliasing() throws SQLException {
return true;
}
@Override
public boolean nullPlusNonNullIsNull() throws SQLException {
return true;
}
@Override
public boolean supportsConvert() throws SQLException {
return true;
}
/**
* {@inheritDoc}
*
* See also {@code org.firebirdsql.jdbc.escape.ConvertFunction} for caveats.
*
*/
@Override
public boolean supportsConvert(int fromType, int toType) throws SQLException {
switch (fromType) {
case JaybirdTypeCodes.DECFLOAT:
if (!firebirdSupportInfo.supportsDecfloat()) {
return false;
}
// Intentional fallthrough
case Types.TINYINT: // Doesn't exist in Firebird; handled as if SMALLINT
case Types.SMALLINT:
case Types.INTEGER:
case Types.BIGINT:
case Types.FLOAT:
case Types.REAL:
case Types.DOUBLE:
case Types.NUMERIC:
case Types.DECIMAL:
// Numerical values all convertible to the same types.
switch (toType) {
case Types.TINYINT: // Doesn't exist in Firebird; handled as if SMALLINT
case Types.SMALLINT:
case Types.INTEGER:
case Types.BIGINT:
case Types.FLOAT:
case Types.REAL:
case Types.DOUBLE:
case Types.NUMERIC:
case Types.DECIMAL:
case Types.CHAR:
case Types.VARCHAR:
case Types.LONGVARCHAR:
case Types.CLOB:
case Types.NCHAR:
case Types.LONGNVARCHAR:
case Types.NVARCHAR:
case Types.NCLOB:
return true;
// casting numerical values to binary types will result in ASCII bytes of string conversion, not to the
// binary representation of the number (eg 1 will be converted to binary 0x31 (ASCII '1'), not 0x01)
case Types.BINARY:
case Types.VARBINARY:
case Types.LONGVARBINARY:
case Types.BLOB:
return true;
case JaybirdTypeCodes.DECFLOAT:
return firebirdSupportInfo.supportsDecfloat();
default:
return false;
}
case Types.CHAR:
case Types.VARCHAR:
case Types.LONGVARCHAR:
case Types.CLOB:
case Types.NCHAR:
case Types.LONGNVARCHAR:
case Types.NVARCHAR:
case Types.NCLOB:
case Types.BINARY:
case Types.VARBINARY:
case Types.LONGVARBINARY:
case Types.BLOB:
case Types.ROWID: // Internally rowid is not discernible from BINARY
// String and binary values all convertible to the same types
// Be aware though that casting of binary to non-string/binary will perform the same conversion as
// if it is an ASCII string value. Eg the binary string value 0x31 cast to integer will be 1, not 49.
switch (toType) {
case Types.CHAR:
case Types.VARCHAR:
case Types.LONGVARCHAR:
case Types.CLOB:
case Types.NCHAR:
case Types.LONGNVARCHAR:
case Types.NVARCHAR:
case Types.NCLOB:
case Types.BINARY:
case Types.VARBINARY:
case Types.LONGVARBINARY:
case Types.BLOB:
return true;
case Types.TINYINT: // Doesn't exist in Firebird; handled as if SMALLINT
case Types.SMALLINT:
case Types.INTEGER:
case Types.BIGINT:
case Types.FLOAT:
case Types.REAL:
case Types.DOUBLE:
case Types.NUMERIC:
case Types.DECIMAL:
case Types.DATE:
case Types.TIME:
case Types.TIMESTAMP:
return fromType != Types.ROWID;
case JaybirdTypeCodes.DECFLOAT:
return fromType != Types.ROWID && firebirdSupportInfo.supportsDecfloat();
case Types.BOOLEAN:
return fromType != Types.ROWID && firebirdSupportInfo.supportsBoolean();
case Types.ROWID:
// As size of rowid is context dependent, we can't cast to it using the convert escape
return false;
case Types.TIME_WITH_TIMEZONE:
case Types.TIMESTAMP_WITH_TIMEZONE:
return fromType != Types.ROWID && firebirdSupportInfo.supportsTimeZones();
default:
return false;
}
case Types.DATE:
switch(toType) {
case Types.DATE:
case Types.TIMESTAMP:
return true;
case Types.TIME:
case Types.TIME_WITH_TIMEZONE:
return false;
case Types.TIMESTAMP_WITH_TIMEZONE:
return firebirdSupportInfo.supportsTimeZones();
case Types.CHAR:
case Types.VARCHAR:
case Types.LONGVARCHAR:
case Types.CLOB:
case Types.NCHAR:
case Types.LONGNVARCHAR:
case Types.NVARCHAR:
case Types.NCLOB:
return true;
// casting date/time values to binary types will result in ASCII bytes of string conversion
case Types.BINARY:
case Types.VARBINARY:
case Types.LONGVARBINARY:
case Types.BLOB:
return true;
default:
return false;
}
case Types.TIME:
switch(toType) {
case Types.TIMESTAMP:
case Types.TIME:
return true;
case Types.DATE:
return false;
case Types.TIME_WITH_TIMEZONE:
case Types.TIMESTAMP_WITH_TIMEZONE:
return firebirdSupportInfo.supportsTimeZones();
case Types.CHAR:
case Types.VARCHAR:
case Types.LONGVARCHAR:
case Types.CLOB:
case Types.NCHAR:
case Types.LONGNVARCHAR:
case Types.NVARCHAR:
case Types.NCLOB:
return true;
// casting date/time values to binary types will result in ASCII bytes of string conversion
case Types.BINARY:
case Types.VARBINARY:
case Types.LONGVARBINARY:
case Types.BLOB:
return true;
default:
return false;
}
case Types.TIMESTAMP:
switch(toType) {
case Types.TIMESTAMP:
case Types.TIME:
case Types.DATE:
return true;
case Types.TIME_WITH_TIMEZONE:
case Types.TIMESTAMP_WITH_TIMEZONE:
return firebirdSupportInfo.supportsTimeZones();
case Types.CHAR:
case Types.VARCHAR:
case Types.LONGVARCHAR:
case Types.CLOB:
case Types.NCHAR:
case Types.LONGNVARCHAR:
case Types.NVARCHAR:
case Types.NCLOB:
return true;
// casting date/time values to binary types will result in ASCII bytes of string conversion
case Types.BINARY:
case Types.VARBINARY:
case Types.LONGVARBINARY:
case Types.BLOB:
return true;
default:
return false;
}
case Types.NULL:
// If a type can be cast to itself, then null can be cast to it as well
return toType != Types.NULL && supportsConvert(toType, toType);
case Types.BOOLEAN:
if (firebirdSupportInfo.supportsBoolean()) {
switch (toType) {
case Types.BOOLEAN:
case Types.CHAR:
case Types.VARCHAR:
case Types.LONGVARCHAR:
case Types.CLOB:
case Types.NCHAR:
case Types.LONGNVARCHAR:
case Types.NVARCHAR:
case Types.NCLOB:
return true;
// casting boolean values to binary types will result in ASCII bytes of string conversion
case Types.BINARY:
case Types.VARBINARY:
case Types.LONGVARBINARY:
case Types.BLOB:
return true;
default:
return false;
}
}
return false;
case Types.TIME_WITH_TIMEZONE:
if (firebirdSupportInfo.supportsTimeZones()) {
switch (toType) {
case Types.TIME:
case Types.TIMESTAMP:
return true;
case Types.DATE:
return false;
case Types.TIME_WITH_TIMEZONE:
case Types.TIMESTAMP_WITH_TIMEZONE:
return true;
case Types.CHAR:
case Types.VARCHAR:
case Types.LONGVARCHAR:
case Types.CLOB:
case Types.NCHAR:
case Types.LONGNVARCHAR:
case Types.NVARCHAR:
case Types.NCLOB:
return true;
// casting date/time values to binary types will result in ASCII bytes of string conversion
case Types.BINARY:
case Types.VARBINARY:
case Types.LONGVARBINARY:
case Types.BLOB:
return true;
default:
return false;
}
}
return false;
case Types.TIMESTAMP_WITH_TIMEZONE:
if (firebirdSupportInfo.supportsTimeZones()) {
switch (toType) {
case Types.TIME:
case Types.TIMESTAMP:
case Types.DATE:
case Types.TIME_WITH_TIMEZONE:
case Types.TIMESTAMP_WITH_TIMEZONE:
return true;
case Types.CHAR:
case Types.VARCHAR:
case Types.LONGVARCHAR:
case Types.CLOB:
case Types.NCHAR:
case Types.LONGNVARCHAR:
case Types.NVARCHAR:
case Types.NCLOB:
return true;
// casting date/time values to binary types will result in ASCII bytes of string conversion
case Types.BINARY:
case Types.VARBINARY:
case Types.LONGVARBINARY:
case Types.BLOB:
return true;
default:
return false;
}
}
return false;
case Types.ARRAY:
// Arrays are not supported by Jaybird (and casting would be tricky anyway)
return false;
// Unsupported types
case Types.BIT:
case Types.OTHER:
case Types.JAVA_OBJECT:
case Types.DISTINCT:
case Types.STRUCT:
case Types.REF:
case Types.DATALINK:
case Types.SQLXML:
case Types.REF_CURSOR:
default:
return false;
}
}
@Override
public boolean supportsTableCorrelationNames() throws SQLException {
return true;
}
@Override
public boolean supportsDifferentTableCorrelationNames() throws SQLException {
return false;
}
@Override
public boolean supportsExpressionsInOrderBy() throws SQLException {
return firebirdSupportInfo.isVersionEqualOrAbove(1, 5);
}
@Override
public boolean supportsOrderByUnrelated() throws SQLException {
return true;
}
@Override
public boolean supportsGroupBy() throws SQLException {
return true;
}
@Override
public boolean supportsGroupByUnrelated() throws SQLException {
// TODO Verify
return false;
}
@Override
public boolean supportsGroupByBeyondSelect() throws SQLException {
// TODO Verify
return false;
}
@Override
public boolean supportsLikeEscapeClause() throws SQLException {
return true;
}
@Override
public boolean supportsMultipleResultSets() throws SQLException {
return false;
}
@Override
public boolean supportsMultipleTransactions() throws SQLException {
return true;
}
@Override
public boolean supportsNonNullableColumns() throws SQLException {
return true;
}
@Override
public boolean supportsMinimumSQLGrammar() throws SQLException {
return true;
}
@Override
public boolean supportsCoreSQLGrammar() throws SQLException {
return true;
}
@Override
public boolean supportsExtendedSQLGrammar() throws SQLException {
return true;
}
@Override
public boolean supportsANSI92EntryLevelSQL() throws SQLException {
return true;
}
@Override
public boolean supportsANSI92IntermediateSQL() throws SQLException {
// TODO Verify
return false;
}
@Override
public boolean supportsANSI92FullSQL() throws SQLException {
// TODO Verify
return false;
}
@Override
public boolean supportsIntegrityEnhancementFacility() throws SQLException {
return true; // rrokytskyy: yep, they call so foreign keys + cascade deletes
}
@Override
public boolean supportsOuterJoins() throws SQLException {
return true;
}
@Override
public boolean supportsFullOuterJoins() throws SQLException {
return true;
}
@Override
public boolean supportsLimitedOuterJoins() throws SQLException {
return true;
}
/**
* {@inheritDoc}
*
* @return the vendor term, always {@code null} because schemas are not supported by database server (see JDBC CTS
* for details).
*/
@Override
public String getSchemaTerm() throws SQLException {
return null;
}
@Override
public String getProcedureTerm() throws SQLException {
return "PROCEDURE";
}
/**
* {@inheritDoc}
*
* @return the vendor term, always {@code null} because catalogs are not supported by database server (see JDBC CTS
* for details).
*/
@Override
public String getCatalogTerm() throws SQLException {
return null;
}
@Override
public boolean isCatalogAtStart() throws SQLException {
return false;
}
/**
* {@inheritDoc}
*
* @return the separator string, always {@code null} because catalogs are not supported by database server (see
* JDBC CTS for details).
*/
@Override
public String getCatalogSeparator() throws SQLException {
return null;
}
@Override
public boolean supportsSchemasInDataManipulation() throws SQLException {
return false;
}
@Override
public boolean supportsSchemasInProcedureCalls() throws SQLException {
return false;
}
@Override
public boolean supportsSchemasInTableDefinitions() throws SQLException {
return false;
}
@Override
public boolean supportsSchemasInIndexDefinitions() throws SQLException {
return false;
}
@Override
public boolean supportsSchemasInPrivilegeDefinitions() throws SQLException {
return false;
}
@Override
public boolean supportsCatalogsInDataManipulation() throws SQLException {
return false;
}
@Override
public boolean supportsCatalogsInProcedureCalls() throws SQLException {
return false;
}
@Override
public boolean supportsCatalogsInTableDefinitions() throws SQLException {
return false;
}
@Override
public boolean supportsCatalogsInIndexDefinitions() throws SQLException {
return false;
}
@Override
public boolean supportsCatalogsInPrivilegeDefinitions() throws SQLException {
return false;
}
@Override
public boolean supportsPositionedDelete() throws SQLException {
return true;
}
@Override
public boolean supportsPositionedUpdate() throws SQLException {
return true;
}
@Override
public boolean supportsSelectForUpdate() throws SQLException {
return true;
}
@Override
public boolean supportsStoredProcedures() throws SQLException {
return true;
}
@Override
public boolean supportsSubqueriesInComparisons() throws SQLException {
return true;
}
@Override
public boolean supportsSubqueriesInExists() throws SQLException {
return true;
}
@Override
public boolean supportsSubqueriesInIns() throws SQLException {
return true;
}
@Override
public boolean supportsSubqueriesInQuantifieds() throws SQLException {
return true;
}
@Override
public boolean supportsCorrelatedSubqueries() throws SQLException {
return true;
}
@Override
public boolean supportsUnion() throws SQLException {
return true;
}
@Override
public boolean supportsUnionAll() throws SQLException {
return true;
}
@Override
public boolean supportsOpenCursorsAcrossCommit() throws SQLException {
return false;//only when commit retaining is executed I think
}
@Override
public boolean supportsOpenCursorsAcrossRollback() throws SQLException {
return false;//commit retaining only.
}
@Override
public boolean supportsOpenStatementsAcrossCommit() throws SQLException {
return true;
}
@Override
public boolean supportsOpenStatementsAcrossRollback() throws SQLException {
return true;
}
//----------------------------------------------------------------------
// The following group of methods exposes various limitations
// based on the target database with the current driver.
// Unless otherwise specified, a result of zero means there is no
// limit, or the limit is not known.
@Override
public int getMaxBinaryLiteralLength() throws SQLException {
return 0; // TODO 32764 Test (assumed on length/2 and max string literal length)
}
@Override
public int getMaxCharLiteralLength() throws SQLException {
return 32765;
}
@Override
public int getMaxColumnNameLength() throws SQLException {
return getMaxObjectNameLength();
}
private int getMaxObjectNameLength() {
if (gdsHelper.compareToVersion(4, 0) < 0) {
return OBJECT_NAME_LENGTH_BEFORE_V4_0;
} else {
return OBJECT_NAME_LENGTH_V4_0;
}
}
@Override
public int getMaxColumnsInGroupBy() throws SQLException {
return 0; //I don't know
}
@Override
public int getMaxColumnsInIndex() throws SQLException {
return 0; //I don't know
}
@Override
public int getMaxColumnsInOrderBy() throws SQLException {
return 0; //I don't know
}
@Override
public int getMaxColumnsInSelect() throws SQLException {
return 0; //I don't know
}
@Override
public int getMaxColumnsInTable() throws SQLException {
return 32767; // Depends on datatypes and sizes, at most 64 kbyte excluding blobs (but including blob ids)
}
@Override
public int getMaxConnections() throws SQLException {
return 0; //I don't know
}
@Override
public int getMaxCursorNameLength() throws SQLException {
return 31;
}
@Override
public int getMaxIndexLength() throws SQLException {
if (gdsHelper.compareToVersion(2, 0) < 0) {
return 252; // See http://www.firebirdsql.org/en/firebird-technical-specifications/
} else {
return 0; // 1/4 of page size, maybe retrieve page size and use that?
}
}
@Override
public int getMaxSchemaNameLength() throws SQLException {
return 0; //No schemas
}
@Override
public int getMaxProcedureNameLength() throws SQLException {
return getMaxObjectNameLength();
}
@Override
public int getMaxCatalogNameLength() throws SQLException {
return 0; //No catalogs
}
@Override
public int getMaxRowSize() throws SQLException {
if (gdsHelper.compareToVersion(1, 5) >= 0)
return 65531;
else
return 0;
}
@Override
public boolean doesMaxRowSizeIncludeBlobs() throws SQLException {
return false; // Blob sizes are not included in rowsize
}
@Override
public int getMaxStatementLength() throws SQLException {
if (gdsHelper.compareToVersion(3, 0) >= 0) {
// 10 MB
return 10 * 1024 * 1024;
} else {
// 64 KB
return 64 * 1024;
}
}
@Override
public int getMaxStatements() throws SQLException {
// Limited by max handles, but this includes other objects than statements
return 0;
}
@Override
public int getMaxTableNameLength() throws SQLException {
return getMaxObjectNameLength();
}
@Override
public int getMaxTablesInSelect() throws SQLException {
// TODO Check if there is a max
return 0;
}
@Override
public int getMaxUserNameLength() throws SQLException {
return getMaxObjectNameLength();
}
//----------------------------------------------------------------------
@Override
public int getDefaultTransactionIsolation() throws SQLException {
return Connection.TRANSACTION_READ_COMMITTED;
}
@Override
public boolean supportsTransactions() throws SQLException {
return true;
}
@Override
public boolean supportsTransactionIsolationLevel(int level) throws SQLException {
switch (level) {
case Connection.TRANSACTION_READ_COMMITTED:
case Connection.TRANSACTION_REPEATABLE_READ:
case Connection.TRANSACTION_SERIALIZABLE:
return true;
default:
return false;
}
}
/**
* {@inheritDoc}
*
* Although Firebird supports both DML and DDL in transactions, it is not possible to use objects in the same
* transaction that defines them. For example, it is not possible to insert into a table in the same transaction
* that created it.
*
*/
@Override
public boolean supportsDataDefinitionAndDataManipulationTransactions() throws SQLException {
return true;
}
@Override
public boolean supportsDataManipulationTransactionsOnly() throws SQLException {
return false;
}
/**
* {@inheritDoc}
*
* Read the note on {@link #supportsDataDefinitionAndDataManipulationTransactions()}.
*
*/
@Override
public boolean dataDefinitionCausesTransactionCommit() throws SQLException {
return false;
}
/**
* {@inheritDoc}
*
* Read the note on {@link #supportsDataDefinitionAndDataManipulationTransactions()}.
*
*/
@Override
public boolean dataDefinitionIgnoredInTransactions() throws SQLException {
return false;
}
@Override
public ResultSet getProcedures(String catalog, String schemaPattern, String procedureNamePattern)
throws SQLException {
return GetProcedures.create(getDbMetadataMediator()).getProcedures(procedureNamePattern);
}
@Override
public ResultSet getProcedureColumns(String catalog, String schemaPattern, String procedureNamePattern,
String columnNamePattern) throws SQLException {
return GetProcedureColumns.create(getDbMetadataMediator())
.getProcedureColumns(procedureNamePattern, columnNamePattern);
}
public static final String TABLE = "TABLE";
public static final String SYSTEM_TABLE = "SYSTEM TABLE";
public static final String VIEW = "VIEW";
public static final String GLOBAL_TEMPORARY = "GLOBAL TEMPORARY";
/**
* {@inheritDoc}
*
* Jaybird defines these additional columns:
*
* - OWNER_NAME String => Owner of the table
* - JB_RELATION_ID Short => Value of {@code RDB$RELATIONS.RDB$RELATION_ID} of the table
*
*
*/
@Override
public ResultSet getTables(String catalog, String schemaPattern, String tableNamePattern, String[] types)
throws SQLException {
return createGetTablesInstance().getTables(tableNamePattern, types);
}
private GetTables createGetTablesInstance() {
return GetTables.create(getDbMetadataMediator());
}
@Override
public ResultSet getSchemas() throws SQLException {
return getSchemas(null, null);
}
@Override
public ResultSet getCatalogs() throws SQLException {
return GetCatalogs.create(getDbMetadataMediator()).getCatalogs();
}
@Override
public ResultSet getTableTypes() throws SQLException {
return createGetTablesInstance().getTableTypes();
}
@Override
public String[] getTableTypeNames() throws SQLException {
return createGetTablesInstance().getTableTypeNames();
}
/**
* {@inheritDoc}
*
*
* Jaybird defines these additional columns:
*
* - JB_IS_IDENTITY String => Indicates whether this column is an identity column (NOTE: Jaybird
* specific column; retrieve by name!).
* There is a subtle difference with the meaning of {@code IS_AUTOINCREMENT}. This column indicates if the column
* is a true identity column.
*
* - YES --- if the column is an identity column
* - NO --- if the column is not an identity column
*
*
* - JB_IDENTITY_TYPE String => Type of identity column (NOTE: Jaybird specific column; retrieve by
* name!)
*
* - ALWAYS --- for a GENERATED ALWAYS AS IDENTITY column (not yet supported in Firebird 3!)
* - BY DEFAULT --- for a GENERATED BY DEFAULT AS IDENTITY column
* - null --- if the column is not an identity type (or the identity type is unknown)
*
*
*
*
*/
@Override
public ResultSet getColumns(String catalog, String schemaPattern, String tableNamePattern, String columnNamePattern)
throws SQLException {
return GetColumns.create(getDbMetadataMediator()).getColumns(tableNamePattern, columnNamePattern);
}
/**
* {@inheritDoc}
*
*
* Jaybird defines an additional column:
*
* - JB_GRANTEE_TYPE String => Object type of {@code GRANTEE} (NOTE: Jaybird specific column;
* retrieve by name!).
*
*
*
* Privileges granted to the table as a whole are reported for each individual column.
*
*
* NOTE: This implementation returns all privileges, not just applicable to the current user. It is
* unclear if this complies with the JDBC requirements. This may change in the future to only return only privileges
* applicable to the current user, user {@code PUBLIC} and — maybe — active roles. This note does not
* apply to the {@code OOREMOTE} sub-protocol, which already restricts privileges to the current user and
* {@code PUBLIC}.
*
*/
@Override
public ResultSet getColumnPrivileges(String catalog, String schema, String table, String columnNamePattern)
throws SQLException {
return GetColumnPrivileges.create(getDbMetadataMediator()).getColumnPrivileges(table, columnNamePattern);
}
/**
* {@inheritDoc}
*
*
* Jaybird defines an additional column:
*
* - JB_GRANTEE_TYPE String => Object type of {@code GRANTEE} (NOTE: Jaybird specific column;
* retrieve by name!).
*
*
*
* NOTE: This implementation returns all privileges, not just applicable to the current user. It is
* unclear if this complies with the JDBC requirements. This may change in the future to only return only privileges
* applicable to the current user, user {@code PUBLIC} and — maybe — active roles. This note does not
* apply to the {@code OOREMOTE} sub-protocol, which already restricts privileges to the current user and
* {@code PUBLIC}.
*
*/
@Override
public ResultSet getTablePrivileges(String catalog, String schemaPattern, String tableNamePattern)
throws SQLException {
return GetTablePrivileges.create(getDbMetadataMediator()).getTablePrivileges(tableNamePattern);
}
/**
* {@inheritDoc}
*
* Jaybird considers the primary key (scoped as {@code bestRowSession} as the best identifier for all scopes.
* Pseudo column {@code RDB$DB_KEY} (scoped as {@code bestRowTransaction} is considered the second-best alternative
* for scopes {@code bestRowTemporary} and {@code bestRowTransaction} if {@code table} has no primary key.
*
*
* Jaybird currently considers {@code RDB$DB_KEY} to be {@link DatabaseMetaData#bestRowTransaction} even if the
* dbkey_scope is set to 1 (session). This may change in the future. See also {@link #getRowIdLifetime()}.
*
*/
@Override
public ResultSet getBestRowIdentifier(String catalog, String schema, String table, int scope, boolean nullable)
throws SQLException {
return GetBestRowIdentifier.create(getDbMetadataMediator())
.getBestRowIdentifier(catalog, schema, table, scope, nullable);
}
/**
* {@inheritDoc}
*
* Jaybird considers both {@code RDB$DB_KEY} and {@code RDB$RECORD_VERSION} (Firebird 3 and higher) as version
* columns.
*
*
* Jaybird only returns pseudo-column as version columns, so 'last updated' columns updated by a trigger,
* calculated columns, or other forms of change tracking are not reported by this method.
*
*/
@Override
public ResultSet getVersionColumns(String catalog, String schema, String table) throws SQLException {
return GetVersionColumns.create(getDbMetadataMediator())
.getVersionColumns(catalog, schema, table);
}
@Override
public ResultSet getPrimaryKeys(String catalog, String schema, String table) throws SQLException {
return GetPrimaryKeys.create(getDbMetadataMediator()).getPrimaryKeys(table);
}
@Override
public ResultSet getImportedKeys(String catalog, String schema, String table) throws SQLException {
return GetImportedKeys.create(getDbMetadataMediator()).getImportedKeys(table);
}
@Override
public ResultSet getExportedKeys(String catalog, String schema, String table) throws SQLException {
return GetExportedKeys.create(getDbMetadataMediator()).getExportedKeys(table);
}
@Override
public ResultSet getCrossReference(
String primaryCatalog, String primarySchema, String primaryTable,
String foreignCatalog, String foreignSchema, String foreignTable) throws SQLException {
return GetCrossReference.create(getDbMetadataMediator()).getCrossReference(primaryTable, foreignTable);
}
@Override
public ResultSet getTypeInfo() throws SQLException {
return GetTypeInfo.create(getDbMetadataMediator()).getTypeInfo();
}
/**
* {@inheritDoc}
*
* Implementation note: The value of {@code FILTER_CONDITION} is populated with the value of
* {@code RDB$INDICES.RDB$CONDITION_SOURCE}, which includes the {@code WHERE} keyword and comments before
* the {@code WHERE} keyword. This is an implementation detail which may change in the future. That is, Jaybird may
* change in the future to only include the condition itself, not the {@code WHERE} keyword, and/or may remove some
* or all comments.
*
*/
@Override
public ResultSet getIndexInfo(String catalog, String schema, String table, boolean unique, boolean approximate)
throws SQLException {
return GetIndexInfo.create(getDbMetadataMediator()).getIndexInfo(table, unique, approximate);
}
@Override
public boolean supportsResultSetType(int type) throws SQLException {
// TODO Return false for TYPE_SCROLL_SENSITVE as we only support it by downgrading to INSENSITIVE?
switch (type){
case ResultSet.TYPE_FORWARD_ONLY:
case ResultSet.TYPE_SCROLL_INSENSITIVE :
case ResultSet.TYPE_SCROLL_SENSITIVE :
return true;
default:
return false;
}
}
@Override
public boolean supportsResultSetConcurrency(int type, int concurrency) throws SQLException {
// TODO Return false for TYPE_SCROLL_SENSITVE as we only support it by downgrading to INSENSITIVE?
switch(type) {
case ResultSet.TYPE_FORWARD_ONLY:
case ResultSet.TYPE_SCROLL_INSENSITIVE :
case ResultSet.TYPE_SCROLL_SENSITIVE :
return concurrency == ResultSet.CONCUR_READ_ONLY ||
concurrency == ResultSet.CONCUR_UPDATABLE;
default:
return false;
}
}
@Override
public boolean ownUpdatesAreVisible(int type) throws SQLException {
// TODO Return false for TYPE_SCROLL_SENSITVE as we only support it by downgrading to INSENSITIVE?
return ResultSet.TYPE_SCROLL_INSENSITIVE == type ||
ResultSet.TYPE_SCROLL_SENSITIVE == type;
}
@Override
public boolean ownDeletesAreVisible(int type) throws SQLException {
// TODO Return false for TYPE_SCROLL_SENSITVE as we only support it by downgrading to INSENSITIVE?
return ResultSet.TYPE_SCROLL_INSENSITIVE == type ||
ResultSet.TYPE_SCROLL_SENSITIVE == type;
}
@Override
public boolean ownInsertsAreVisible(int type) throws SQLException {
// TODO Return false for TYPE_SCROLL_SENSITVE as we only support it by downgrading to INSENSITIVE?
return ResultSet.TYPE_SCROLL_INSENSITIVE == type ||
ResultSet.TYPE_SCROLL_SENSITIVE == type;
}
@Override
public boolean othersUpdatesAreVisible(int type) throws SQLException {
return false;
}
@Override
public boolean othersDeletesAreVisible(int type) throws SQLException {
return false;
}
@Override
public boolean othersInsertsAreVisible(int type) throws SQLException {
return false;
}
@Override
public boolean updatesAreDetected(int type) throws SQLException {
// TODO Currently not correct when scrollableCursor=SERVER (and not a holdable cursor);
// change to return true when behaviour of EMULATED is the same
return false;
}
@Override
public boolean deletesAreDetected(int type) throws SQLException {
// TODO Currently not correct when scrollableCursor=SERVER (and not a holdable cursor);
// change to return true when behaviour of EMULATED is the same
return false;
}
@Override
public boolean insertsAreDetected(int type) throws SQLException {
// TODO Currently not correct when scrollableCursor=SERVER (and not a holdable cursor);
// change to return true when behaviour of EMULATED is the same
return false;
}
@Override
public boolean supportsBatchUpdates() throws SQLException {
return true;
}
/**
* {@inheritDoc}
*
* UDTs are not supported by Firebird. This method will always return an empty ResultSet.
*
*/
@Override
public ResultSet getUDTs(String catalog, String schemaPattern, String typeNamePattern, int[] types)
throws SQLException {
return GetUDTs.create(getDbMetadataMediator()).getUDTs();
}
@Override
public Connection getConnection() throws SQLException {
return connection;
}
/**
* {@inheritDoc}
*
* UDTs are not supported by Firebird. This method will always return an empty ResultSet.
*
*/
@Override
public ResultSet getAttributes(String catalog, String schemaPattern, String typeNamePattern,
String attributeNamePattern) throws SQLException {
return GetAttributes.create(getDbMetadataMediator()).getAttributes();
}
@Override
public boolean supportsSavepoints() throws SQLException {
return firebirdSupportInfo.supportsSavepoint();
}
@Override
public boolean supportsNamedParameters() throws SQLException {
return false;
}
@Override
public boolean supportsMultipleOpenResults() throws SQLException {
return false;
}
@Override
public boolean supportsGetGeneratedKeys() throws SQLException {
return firebirdSupportInfo.supportsInsertReturning()
&& connection.getGeneratedKeysSupport().supportsGetGeneratedKeys();
}
/**
* {@inheritDoc}
*
* Supertypes are not supported by Firebird. This method will always return an empty ResultSet.
*
*/
@Override
public ResultSet getSuperTypes(String catalog, String schemaPattern, String tableNamePattern) throws SQLException {
return GetSuperTypes.create(getDbMetadataMediator()).getSuperTypes();
}
/**
* {@inheritDoc}
*
* Supertables are not supported by Firebird. This method will always return an empty ResultSet.
*
*/
@Override
public ResultSet getSuperTables(String catalog, String schemaPattern, String tableNamePattern) throws SQLException {
return GetSuperTables.create(getDbMetadataMediator()).getSuperTables();
}
@Override
public boolean supportsResultSetHoldability(int holdability) throws SQLException {
return holdability == ResultSet.CLOSE_CURSORS_AT_COMMIT ||
holdability == ResultSet.HOLD_CURSORS_OVER_COMMIT;
}
@Override
public int getResultSetHoldability() throws SQLException {
// TODO Retrieve default holdable connection property
return ResultSet.CLOSE_CURSORS_AT_COMMIT;
}
@Override
public int getDatabaseMajorVersion() throws SQLException {
return gdsHelper.getDatabaseProductMajorVersion();
}
@Override
public int getDatabaseMinorVersion() throws SQLException {
return gdsHelper.getDatabaseProductMinorVersion();
}
@Override
public int getOdsMajorVersion() {
return gdsHelper.getCurrentDatabase().getOdsMajor();
}
@Override
public int getOdsMinorVersion() {
return gdsHelper.getCurrentDatabase().getOdsMinor();
}
@Override
public int getDatabaseDialect() throws SQLException {
return gdsHelper.getCurrentDatabase().getDatabaseDialect();
}
@Override
public int getConnectionDialect() throws SQLException {
return gdsHelper.getCurrentDatabase().getConnectionDialect();
}
/**
* {@inheritDoc}
*
* Firebird primarily uses SQL standard SQL states, but may occasionally use values from X/Open.
*
*/
@Override
public int getSQLStateType() throws SQLException {
return DatabaseMetaData.sqlStateSQL;
}
@Override
public boolean supportsStoredFunctionsUsingCallSyntax() throws SQLException {
return false;
}
/**
* {@inheritDoc}
*
* The holdable result sets remain open, others are closed, but this happens before the statement is executed.
*
*/
@Override
public boolean autoCommitFailureClosesAllResultSets() throws SQLException {
// the holdable result sets remain open, others are closed, but this
// happens before the statement is executed
return false;
}
@Override
public ResultSet getClientInfoProperties() throws SQLException {
return GetClientInfoProperties.create(getDbMetadataMediator()).getClientInfoProperties();
}
/**
* {@inheritDoc}
*
*
* This method does not return columns of functions defined in packages.
*
*/
@Override
public ResultSet getFunctionColumns(String catalog, String schemaPattern, String functionNamePattern,
String columnNamePattern) throws SQLException {
return GetFunctionColumns.create(getDbMetadataMediator())
.getFunctionColumns(functionNamePattern, columnNamePattern);
}
/**
* {@inheritDoc}
*
*
* Jaybird defines a number of additional columns. As these are not defined in JDBC, their position may change with
* revisions of JDBC. We recommend to retrieve these columns by name. The following additional columns are
* available:
*
* - JB_FUNCTION_SOURCE String => The source of the function (for Firebird 3+ PSQL functions only)).
* - JB_FUNCTION_KIND String => The kind of function, one of "UDF", "PSQL" (Firebird 3+) or
* "UDR" (Firebird 3+)
* - JB_MODULE_NAME String => Value of {@code RDB$MODULE_NAME} (is {@code null} for PSQL)
* - JB_ENTRYPOINT String => Value of {@code RDB$ENTRYPOINT} (is {@code null} for PSQL)
* - JB_ENGINE_NAME String => Value of {@code RDB$ENGINE_NAME} (is {@code null} for UDF and PSQL)
*
*
*
* This method does not return functions defined in packages.
*
*/
@Override
public ResultSet getFunctions(String catalog, String schemaPattern, String functionNamePattern)
throws SQLException {
return GetFunctions.create(getDbMetadataMediator()).getFunctions(functionNamePattern);
}
@Override
public ResultSet getSchemas(String catalog, String schemaPattern) throws SQLException {
return GetSchemas.create(getDbMetadataMediator()).getSchemas(schemaPattern);
}
@Override
public boolean isWrapperFor(Class iface) throws SQLException {
return iface != null && iface.isAssignableFrom(FBDatabaseMetaData.class);
}
@Override
public T unwrap(Class iface) throws SQLException {
if (!isWrapperFor(iface))
throw new SQLException("Unable to unwrap to class " + iface.getName());
return iface.cast(this);
}
/**
* Escapes the like wildcards and escape ({@code \_%} in the provided search string with a {@code \}.
*
* Primary purpose is to escape object names with wildcards for use in metadata patterns for literal matches, but
* it can also be used to escape for SQL {@code LIKE}.
*
*
* @param objectName
* Object name to escape.
* @return Object name with wildcards escaped.
*/
public static String escapeWildcards(String objectName) {
return MetadataPattern.escapeWildcards(objectName);
}
@Override
public ResultSet getPseudoColumns(String catalog, String schemaPattern, String tableNamePattern,
String columnNamePattern) throws SQLException {
return GetPseudoColumns.create(getDbMetadataMediator()).getPseudoColumns(tableNamePattern, columnNamePattern);
}
@Override
public boolean generatedKeyAlwaysReturned() throws SQLException {
// TODO Double check if this is correct
return false;
}
@Override
public String getProcedureSourceCode(String procedureName) throws SQLException {
String sResult = null;
String sql = "Select RDB$PROCEDURE_SOURCE From RDB$PROCEDURES Where "
+ "RDB$PROCEDURE_NAME = ?";
List params = new ArrayList<>();
params.add(procedureName);
try (ResultSet rs = doQuery(sql, params)) {
if (rs.next()) sResult = rs.getString(1);
}
return sResult;
}
@Override
public String getTriggerSourceCode(String triggerName) throws SQLException {
String sResult = null;
String sql = "Select RDB$TRIGGER_SOURCE From RDB$TRIGGERS Where RDB$TRIGGER_NAME = ?";
List params = new ArrayList<>();
params.add(triggerName);
try (ResultSet rs = doQuery(sql, params)) {
if (rs.next()) sResult = rs.getString(1);
}
return sResult;
}
@Override
public String getViewSourceCode(String viewName) throws SQLException {
String sResult = null;
String sql = "Select RDB$VIEW_SOURCE From RDB$RELATIONS Where RDB$RELATION_NAME = ?";
List params = new ArrayList<>();
params.add(viewName);
try (ResultSet rs = doQuery(sql, params)) {
if (rs.next()) sResult = rs.getString(1);
}
return sResult;
}
protected static byte[] getBytes(String value) {
return value != null ? value.getBytes(StandardCharsets.UTF_8) : null;
}
private FBPreparedStatement getStatement(String sql, boolean standalone) throws SQLException {
try (LockCloseable ignored = connection.withLock()) {
if (!standalone) {
// Check cache
FBPreparedStatement cachedStatement = statements.get(sql);
if (cachedStatement != null) {
if (cachedStatement.isClosed()) {
//noinspection resource
statements.remove(sql);
} else {
return cachedStatement;
}
}
}
InternalTransactionCoordinator.MetaDataTransactionCoordinator metaDataTransactionCoordinator =
new InternalTransactionCoordinator.MetaDataTransactionCoordinator(connection.txCoordinator);
FBPreparedStatement newStatement = new FBPreparedStatement(gdsHelper, sql,
ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY, ResultSet.CLOSE_CURSORS_AT_COMMIT,
metaDataTransactionCoordinator, metaDataTransactionCoordinator, true, standalone, false);
if (!standalone) {
statements.put(sql, newStatement);
}
return newStatement;
}
}
/**
* Execute an SQL query with a given set of parameters.
*
* @param sql
* The sql statement to be used for the query
* @param params
* The parameters to be used in the query
* @throws SQLException
* if a database access error occurs
*/
protected ResultSet doQuery(String sql, List params) throws SQLException {
return doQuery(sql, params, false);
}
/**
* Execute an SQL query with a given set of parameters.
*
* @param sql
* The sql statement to be used for the query
* @param params
* The parameters to be used in the query
* @param standalone
* The query to be executed is a standalone query (should not be cached and be closed asap)
* @throws SQLException
* if a database access error occurs
*/
protected ResultSet doQuery(String sql, List params, boolean standalone) throws SQLException {
FBPreparedStatement s = getStatement(sql, standalone);
for (int i = 0; i < params.size(); i++) {
s.setString(i + 1, params.get(i));
}
return s.executeMetaDataQuery();
}
/**
* {@inheritDoc}
*
* Minimum lifetime supported by Firebird is transaction-scope, and this can be changed to session-scope with
* {@code isc_dpb_dbkey_scope} set to {@code 1} (eg connection property {@code dbkey_scope=1}). This implementation,
* however, will always report {@link RowIdLifetime#ROWID_VALID_TRANSACTION}.
*
*/
@Override
public RowIdLifetime getRowIdLifetime() throws SQLException {
return RowIdLifetime.ROWID_VALID_TRANSACTION;
}
static final int JDBC_MAJOR_VERSION = 4;
static final int JDBC_MINOR_VERSION;
static {
int tempVersion;
try {
String javaImplementation = getSystemPropertyPrivileged("java.specification.version");
if (javaImplementation == null) {
// Assume common case: JDBC 4.3
tempVersion = 3;
} else {
int javaVersionMajor;
try {
javaVersionMajor = (int) Double.parseDouble(javaImplementation);
} catch (NumberFormatException e) {
javaVersionMajor = 1;
}
if (javaVersionMajor >= 9) {
// JDK 9 or higher: JDBC 4.3
tempVersion = 3;
} else {
// JDK 1.8 or lower: JDBC 4.2
tempVersion = 2;
}
}
} catch (RuntimeException ex) {
// default to 3 (JDBC 4.3) when privileged call fails
tempVersion = 3;
}
JDBC_MINOR_VERSION = tempVersion;
}
@Override
public int getJDBCMajorVersion() {
return JDBC_MAJOR_VERSION;
}
@Override
public int getJDBCMinorVersion() {
return JDBC_MINOR_VERSION;
}
@SuppressWarnings("SameParameterValue")
private static String getSystemPropertyPrivileged(final String propertyName) {
return AccessController.doPrivileged((PrivilegedAction) () -> System.getProperty(propertyName));
}
private static class LruPreparedStatementCache extends LinkedHashMap {
private static final long serialVersionUID = -6600678461169652270L;
private final int maxCapacity;
private LruPreparedStatementCache(int maxCapacity) {
super(16, 0.75f, true);
this.maxCapacity = maxCapacity;
}
@Override
protected boolean removeEldestEntry(Map.Entry eldest) {
if (size() <= maxCapacity) {
return false;
}
try {
FBPreparedStatement statement = eldest.getValue();
statement.close();
} catch (Exception e) {
log.debug("Closing eldest cached metadata statement yielded an exception; ignored", e);
}
return true;
}
}
protected DbMetadataMediator getDbMetadataMediator() {
return new DbMetadataMediatorImpl();
}
private class DbMetadataMediatorImpl extends DbMetadataMediator {
@Override
protected FirebirdSupportInfo getFirebirdSupportInfo() {
return firebirdSupportInfo;
}
@Override
protected ResultSet performMetaDataQuery(MetadataQuery metadataQuery) throws SQLException {
return doQuery(metadataQuery.getQueryText(), metadataQuery.getParameters(), metadataQuery.isStandalone());
}
@Override
protected FBDatabaseMetaData getMetaData() {
return FBDatabaseMetaData.this;
}
@Override
protected GDSType getGDSType() {
return FBDatabaseMetaData.this.getGDSType();
}
@Override
protected int getOdsMajorVersion() {
return FBDatabaseMetaData.this.getOdsMajorVersion();
}
@Override
protected int getOdsMinorVersion() {
return FBDatabaseMetaData.this.getOdsMinorVersion();
}
}
}
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