#java.sql.DatabaseMetaData
DatabaseMetaData接口是与数据库相关的综合信息接口。用户可通过此接口获取并处理底层DBMS的信息。
部分DatabaseMetaData方法以ResultSet对象的形式返回信息列表，可通过常规ResultSet方法（例如getString和getInt）从这些ResultSet对象检索数据。
如果给定形式的元数据不可用，则接口返回空的ResultSet。
返回列可以定义为ResultSet对象之外的其他列，但应该通过JDBC驱动程序定义，并且必须通过其列标签访问。
YashanDB JDBC驱动对DatabaseMetaData接口已支持功能：
Note：
下表中如下方法不适用于分布式部署：
- getProcedures(String catalog, String schemaPattern, String procedureNamePattern)
- getProcedureColumns(String catalog, String schemaPattern, String procedureNamePattern, String columnNamePattern)
| 返回类型 | 方法 |
|---|---|
| boolean | allProceduresAreCallable() |
| boolean | allTablesAreSelectable() |
| boolean | autoCommitFailureClosesAllResultSets() |
| boolean | dataDefinitionCausesTransactionCommit() |
| boolean | dataDefinitionIgnoredInTransactions() |
| boolean | deletesAreDetected(int type) |
| boolean | doesMaxRowSizeIncludeBlobs() |
| boolean | generatedKeyAlwaysReturned() |
| ResultSet | getColumns(String catalog, String schemaPattern, String tableNamePattern, String columnNamePattern) |
| Connection | getConnection() |
| int | getDatabaseMajorVersion() |
| int | getDatabaseMinorVersion() |
| String | getDatabaseProductName() |
| String | getDatabaseProductVersion() |
| int | getDefaultTransactionIsolation() |
| int | getDriverMajorVersion() |
| int | getDriverMinorVersion() |
| String | getDriverName() |
| String | getDriverVersion() |
| String | getExtraNameCharacters() |
| ResultSet | getFunctions(String catalog, String schemaPattern, String functionNamePattern) |
| String | getIdentifierQuoteString() |
| ResultSet | getIndexInfo(String catalog, String schema, String table, boolean unique, boolean approximate) |
| int | getJDBCMajorVersion() |
| int | getJDBCMinorVersion() |
| int | getMaxBinaryLiteralLength() |
| int | getMaxCatalogNameLength() |
| int | getMaxCharLiteralLength() |
| int | getMaxColumnNameLength() |
| int | getMaxColumnsInGroupBy() |
| int | getMaxColumnsInIndex() |
| int | getMaxColumnsInOrderBy() |
| int | getMaxColumnsInSelect() |
| int | getMaxColumnsInTable() |
| int | getMaxConnections() |
| int | getMaxCursorNameLength() |
| int | getMaxIndexLength() |
| long | getMaxLogicalLobSize() |
| int | getMaxProcedureNameLength() |
| int | getMaxRowSize() |
| int | getMaxSchemaNameLength() |
| int | getMaxStatementLength() |
| int | getMaxStatements() |
| int | getMaxTableNameLength() |
| int | getMaxTablesInSelect() |
| int | getMaxUserNameLength() |
| String | getNumericFunctions() |
| ResultSet | getPrimaryKeys(String catalog, String schema, String table) |
| ResultSet | getProcedures(String catalog, String schemaPattern, String procedureNamePattern) |
| String | getProcedureTerm() |
| int | getResultSetHoldability() |
| RowIdLifetime | getRowIdLifetime() |
| ResultSet | getSchemas() |
| ResultSet | getSchemas(String catalog, String schemaPattern) |
| String | getSchemaTerm() |
| String | getSearchStringEscape() |
| String | getSQLKeywords() |
| int | getSQLStateType() |
| String | getStringFunctions() |
| String | getSystemFunctions() |
| ResultSet | getTables(String catalog, String schemaPattern, String tableNamePattern, String[] types) |
| ResultSet | getTableTypes() |
| String | getTimeDateFunctions() |
| ResultSet | getTypeInfo() |
| String | getURL() |
| String | getUserName() |
| boolean | insertsAreDetected(int type) |
| boolean | isReadOnly() |
| boolean | locatorsUpdateCopy() |
| boolean | nullPlusNonNullIsNull() |
| boolean | nullsAreSortedAtEnd() |
| boolean | nullsAreSortedAtStart() |
| boolean | nullsAreSortedHigh() |
| boolean | nullsAreSortedLow() |
| boolean | othersDeletesAreVisible(int type) |
| boolean | othersInsertsAreVisible(int type) |
| boolean | othersUpdatesAreVisible(int type) |
| boolean | ownDeletesAreVisible(int type) |
| boolean | ownInsertsAreVisible(int type) |
| boolean | ownUpdatesAreVisible(int type) |
| boolean | storesLowerCaseIdentifiers() |
| boolean | storesLowerCaseQuotedIdentifiers() |
| boolean | storesMixedCaseIdentifiers() |
| boolean | storesMixedCaseQuotedIdentifiers() |
| boolean | storesUpperCaseIdentifiers() |
| boolean | storesUpperCaseQuotedIdentifiers() |
| boolean | supportsAlterTableWithAddColumn() |
| boolean | supportsAlterTableWithDropColumn() |
| boolean | supportsANSI92EntryLevelSQL() |
| boolean | supportsANSI92FullSQL() |
| boolean | supportsANSI92IntermediateSQL() |
| boolean | supportsBatchUpdates() |
| boolean | supportsColumnAliasing() |
| boolean | supportsConvert() |
| boolean | supportsConvert(int fromType, int toType) |
| boolean | supportsCoreSQLGrammar() |
| boolean | supportsCorrelatedSubqueries() |
| boolean | supportsDataDefinitionAndDataManipulationTransactions() |
| boolean | supportsDataManipulationTransactionsOnly() |
| boolean | supportsDifferentTableCorrelationNames() |
| boolean | supportsExpressionsInOrderBy() |
| boolean | supportsExtendedSQLGrammar() |
| boolean | supportsFullOuterJoins() |
| boolean | supportsGetGeneratedKeys() |
| boolean | supportsGroupBy() |
| boolean | supportsGroupByBeyondSelect() |
| boolean | supportsGroupByUnrelated() |
| boolean | supportsIntegrityEnhancementFacility() |
| boolean | supportsLikeEscapeClause() |
| boolean | supportsLimitedOuterJoins() |
| boolean | supportsMinimumSQLGrammar() |
| boolean | supportsMixedCaseIdentifiers() |
| boolean | supportsMixedCaseQuotedIdentifiers() |
| boolean | supportsMultipleOpenResults() |
| boolean | supportsMultipleResultSets() |
| boolean | supportsMultipleTransactions() |
| boolean | supportsNamedParameters() |
| boolean | supportsNonNullableColumns() |
| boolean | supportsOpenCursorsAcrossCommit() |
| boolean | supportsOpenCursorsAcrossRollback() |
| boolean | supportsOpenStatementsAcrossCommit() |
| boolean | supportsOpenStatementsAcrossRollback() |
| boolean | supportsOrderByUnrelated() |
| boolean | supportsOuterJoins() |
| boolean | supportsPositionedDelete() |
| boolean | supportsPositionedUpdate() |
| boolean | supportsRefCursors() |
| boolean | supportsResultSetConcurrency(int type, int concurrency) |
| boolean | supportsResultSetHoldability(int holdability) |
| boolean | supportsResultSetType(int type) |
| boolean | supportsSavepoints() |
| boolean | supportsSchemasInDataManipulation() |
| boolean | supportsSchemasInIndexDefinitions() |
| boolean | supportsSchemasInPrivilegeDefinitions() |
| boolean | supportsSchemasInProcedureCalls() |
| boolean | supportsSchemasInTableDefinitions() |
| boolean | supportsSelectForUpdate() |
| boolean | supportsStatementPooling() |
| boolean | supportsStoredFunctionsUsingCallSyntax() |
| boolean | supportsStoredProcedures() |
| boolean | supportsSubqueriesInComparisons() |
| boolean | supportsSubqueriesInExists() |
| boolean | supportsSubqueriesInIns() |
| boolean | supportsSubqueriesInQuantifieds() |
| boolean | supportsTableCorrelationNames() |
| boolean | supportsTransactionIsolationLevel(int level) |
| boolean | supportsTransactions() |
| boolean | supportsUnion() |
| boolean | supportsUnionAll() |
| boolean | updatesAreDetected(int type) |
| boolean | usesLocalFilePerTable() |
| boolean | usesLocalFiles() |
| ResultSet | getBestRowIdentifier(String catalog, String schema, String table, int scope, boolean nullable) |
| ResultSet | getCrossReference(String parentCatalog, String parentSchema, String parentTable, String foreignCatalog, String foreignSchema, String foreignTable) |
| ResultSet | getExportedKeys(String catalog, String schema, String table) |
| ResultSet | getFunctionColumns(String catalog, String schemaPattern, String functionNamePattern, String columnNamePattern) |
| ResultSet | getImportedKeys(String catalog, String schema, String table) |
| ResultSet | getProcedureColumns(String catalog, String schemaPattern, String procedureNamePattern, String columnNamePattern) |
| ResultSet | getPseudoColumns(String catalog, String schemaPattern, String tableNamePattern, String columnNamePattern) |
| ResultSet | getTablePrivileges(String catalog, String schemaPattern, String tableNamePattern) |
| ResultSet | getVersionColumns(String catalog, String schema, String table) |
| ResultSet | getUDTs(String catalog, String schemaPattern, String typeNamePattern, int[] types) |
| ResultSet | getSuperTypes(String catalog, String schemaPattern, String typeNamePattern) |
未支持功能：
| 返回类型 | 方法 |
|---|---|
| ResultSet | getAttributes(String catalog, String schemaPattern, String typeNamePattern, String attributeNamePattern) |
| ResultSet | getClientInfoProperties() |
| ResultSet | getColumnPrivileges(String catalog, String schema, String table, String columnNamePattern) |
| String | getCatalogTerm() |
| boolean | isCatalogAtStart() |
| String | getCatalogSeparator() |
| boolean | supportsCatalogsInDataManipulation() |
| boolean | supportsCatalogsInIndexDefinitions() |
| boolean | supportsCatalogsInPrivilegeDefinitions() |
| boolean | supportsCatalogsInProcedureCalls() |
| boolean | supportsCatalogsInTableDefinitions() |
| ResultSet | getCatalogs() |
| ResultSet | getSuperTables(String catalog, String schemaPattern, String tableNamePattern) |
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