Package org.apache.cayenne.dba

Interface DbAdapter

All Known Implementing Classes:
AutoAdapter, DB2Adapter, DerbyAdapter, FirebirdAdapter, FrontBaseAdapter, H2Adapter, HSQLDBAdapter, IngresAdapter, JdbcAdapter, MySQLAdapter, OracleAdapter, PostgresAdapter, SQLiteAdapter, SQLServerAdapter, SybaseAdapter
public interface DbAdapter
A Cayenne extension point that abstracts the differences between specifics of JDBC interfaces to various databases. Cayenne already ships with a number of built-in adapters for most common databases and users can provide their own custom adapters.

  • Method Details

    • getBatchTerminator

      String getBatchTerminator()
      Returns a String used to terminate a batch in command-line tools. E.g. ";" on Oracle or "go" on Sybase.
      Since:
      1.0.4

    • getSelectTranslator

      SelectTranslator getSelectTranslator(Select<?> query, EntityResolver entityResolver)
      Returns the SelectTranslator for the given query. The default implementation ignores the query, but the parameter is retained so adapters can pick a translator based on it.
      Since:
      4.2

    • getProcedureTranslator

      ProcedureTranslator getProcedureTranslator(ProcedureQuery query, EntityResolver entityResolver)
      Returns the ProcedureTranslator for the given query. The default implementation ignores the query, but the parameter is retained so adapters can pick a translator based on it.
      Since:
      5.0

    • getSqlTreeProcessor

      SQLTreeProcessor getSqlTreeProcessor()
      Returns:
      SQLTreeProcessor that can adjust SQL tree to specific database flavour
      Since:
      4.2

    • getAction

      SQLAction getAction(Query query, DataNode node)
      Returns an instance of SQLAction that should handle the query.
      Since:
      1.2

    • supportsUniqueConstraints

      boolean supportsUniqueConstraints()
      Returns true if a target database supports UNIQUE constraints.
      Since:
      1.1

    • supportsCatalogsOnReverseEngineering

      boolean supportsCatalogsOnReverseEngineering()
      Returns true if a target database supports catalogs on reverse engineering.
      Since:
      4.0

    • supportsGeneratedKeys

      boolean supportsGeneratedKeys()
      Returns true if a target database supports key autogeneration. This feature also requires JDBC3-compliant driver.
      Since:
      1.2

    • supportsGeneratedKeysForBatchInserts

      default boolean supportsGeneratedKeysForBatchInserts()
      Returns true if a target database supports key autogeneration in a batch insert.
      Since:
      4.2
      See Also:

    • supportsBatchUpdates

      boolean supportsBatchUpdates()
      Returns true if the target database supports batch updates.

    • typeSupportsLength

      boolean typeSupportsLength(int type)

    • typeSupportsScale

      boolean typeSupportsScale(int type)
      Returns true if supplied type can have a scale attribute as a part of column definition.
      Since:
      5.0

    • defaultCharColumnLength

      int defaultCharColumnLength()
      Returns the length to use for an unconstrained character column (a CHAR/VARCHAR-family column with no max length) when this database requires a length.
      Since:
      5.0

    • preferredNativeColumnType

      default NativeColumnType preferredNativeColumnType(DbAttribute column)
      Since:
      5.0

    • dropTableStatements

      Collection<String> dropTableStatements(DbEntity table)
      Returns a collection of SQL statements needed to drop a database table.
      Since:
      3.0

    • createTable

      String createTable(DbEntity entity)
      Returns a SQL string that can be used to create database table corresponding to entity parameter.

    • createUniqueConstraint

      String createUniqueConstraint(DbEntity source, Collection<DbAttribute> columns)
      Returns a DDL string to create a unique constraint over a set of columns, or null if the unique constraints are not supported.
      Since:
      1.1

    • createFkConstraint

      String createFkConstraint(DbRelationship rel)
      Returns a SQL string that can be used to create a foreign key constraint for the relationship, or null if foreign keys are not supported.

    • externalTypesForJdbcType

      @Deprecated(since="5.0", forRemoval=true) String[] externalTypesForJdbcType(int type)
      Deprecated, for removal: This API element is subject to removal in a future version.
      use nativeColumnTypes(int)
      Returns an array of RDBMS types that can be used with JDBC type. Valid JDBC types are defined in java.sql.Types.

    • nativeColumnTypes

      NativeColumnType[] nativeColumnTypes(int type)
      Returns the database-native types that the given JDBC type (see Types) maps to, or null if the type is not supported. The first variant is used for column DDL.
      Since:
      5.0

    • getExtendedTypes

      ExtendedTypeMap getExtendedTypes()
      Returns a map of ExtendedTypes that is used to translate values between Java and JDBC layer.

    • createPkGenerator

      PkGenerator createPkGenerator()
      Returns a new primary key generator of the default type associated with this adapter. DataNode would use this generator, unless explicitly overridden. DbAdapter does not cache the generator as it is often stateful.
      Since:
      5.0

    • buildAttribute

      DbAttribute buildAttribute(String name, String typeName, int type, int size, int scale, boolean allowNulls)
      Creates and returns a DbAttribute based on supplied parameters (usually obtained from database metadata).
      Parameters:
      name - database column name
      typeName - database specific type name, may be used as a hint to determine the right JDBC type.
      type - JDBC column type
      size - database column size (ignored if less than zero)
      scale - database column scale, i.e. the number of decimal digits (ignored if less than zero)
      allowNulls - database column nullable parameter

    • bindParameter

      void bindParameter(PreparedStatement statement, PSParameter<?> parameter) throws Exception
      Binds an object value to PreparedStatement's parameter.
      Throws:
      Exception
      Since:
      5.0

    • bindParameter

      void bindParameter(CallableStatement statement, CSParameter<?> parameter) throws Exception
      Binds an object value to CallableStatement's parameter.
      Throws:
      Exception
      Since:
      5.0

    • preferredBindingType

      default int preferredBindingType(int jdbcType)
      Returns the JDBC type that this adapter prefers to bind for a given mapped JDBC type. The default implementation is an identity function; adapters whose drivers require a different type (e.g. remapping the N* character types to their non-national counterparts) override this. The returned type is resolved into the PSParameter at binding creation time, so it matches the type actually sent to the PreparedStatement.
      Since:
      5.0

    • tableTypeForTable

      String tableTypeForTable()
      Returns the name of the table type (as returned by DatabaseMetaData.getTableTypes) for a simple user table.

    • tableTypeForView

      String tableTypeForView()
      Returns the name of the table type (as returned by DatabaseMetaData.getTableTypes) for a view table.

    • createTableAppendColumn

      void createTableAppendColumn(StringBuffer sqlBuffer, DbAttribute column)
      Append the column type part of a "create table" to the given StringBuffer
      Parameters:
      sqlBuffer - the StringBuffer to append the column type to
      column - the DbAttribute defining the column to append type for
      Since:
      3.0

    • getQuotingStrategy

      @Deprecated(since="5.0", forRemoval=true) QuotingStrategy getQuotingStrategy()
      Deprecated, for removal: This API element is subject to removal in a future version.
      in favor of getQuotingStrategy(DbEntity)
      Returns the SQL identifier quoting style (start/end quote characters) for this adapter. Whether quoting is applied is decided by the caller, which uses this instance when quoting is enabled and QuotingStrategy.NONE otherwise.
      Since:
      4.0

    • getQuotingStrategy

      QuotingStrategy getQuotingStrategy(DbEntity entity)
      Resolves the QuotingStrategy to use for the given entity: this adapter's strategy when the entity's DataMap enables SQL identifier quoting, and QuotingStrategy.NONE otherwise.
      Since:
      5.0

    • unwrap

      DbAdapter unwrap()
      Allows the users to get access to the adapter decorated by a given adapter.
      Since:
      4.0

    • getEjbqlTranslator

      EJBQLTranslator getEjbqlTranslator()
      Returns the EJBQLTranslator for EJBQL to SQL translation.
      Since:
      5.0

    • getEjbqlTranslatorFactory

      @Deprecated(since="5.0", forRemoval=true) default EJBQLTranslator getEjbqlTranslatorFactory()
      Deprecated, for removal: This API element is subject to removal in a future version.
      in favor of getEjbqlTranslator().

    • getSystemCatalogs

      List<String> getSystemCatalogs()
      Returns:
      list of system catalogs
      Since:
      4.1

    • getSystemSchemas

      List<String> getSystemSchemas()
      Returns:
      list of system schemas
      Since:
      4.1