org.objectstyle.cayenne.dba.DbAdapter Maven / Gradle / Ivy
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*
* - Make Cayenne code independent from SQL syntax differences between different RDBMS.
*
- Allow for vendor-specific tuning of JDBC access.
*
*
* @author Andrei Adamchik
*/
public interface DbAdapter {
/**
* Returns a String used to terminate a batch in command-line tools. E.g. ";" on
* Oracle or "go" on Sybase.
*
* @since 1.0.4
*/
public String getBatchTerminator();
/**
* Creates an returns a named instance of a DataNode.
*
* @deprecated since 1.2 this method is not used as node behavior customization is
* done via SQLActionVisitor.
*/
public DataNode createDataNode(String name);
/**
* Creates and returns a QueryTranslator appropriate for the specified
* query parameter. Sets translator "query" and "adapter" property.
*
* This factory method allows subclasses to specify their own translators that
* implement vendor-specific optimizations.
*
*
* @deprecated since 1.2 this method is unneeded as customizations are done via custom
* SQLActions.
*/
public QueryTranslator getQueryTranslator(Query query) throws Exception;
// TODO: deprecate and move into SQLAction implementation
public QualifierTranslator getQualifierTranslator(QueryAssembler queryAssembler);
/**
* Returns an instance of SQLAction that should handle the query.
*
* @since 1.2
*/
public SQLAction getAction(Query query, DataNode node);
/**
* Returns true if a target database supports FK constraints.
*/
public boolean supportsFkConstraints();
/**
* Returns true if a target database supports UNIQUE constraints.
*
* @since 1.1
*/
public boolean supportsUniqueConstraints();
/**
* Returns true if a target database supports key autogeneration. This feature also
* requires JDBC3-compliant driver.
*
* @since 1.2
*/
public boolean supportsGeneratedKeys();
/**
* Returns true if the target database supports batch updates.
*/
public boolean supportsBatchUpdates();
/**
* Returns a SQL string that can be used to drop a database table corresponding to
* ent parameter.
*/
public String dropTable(DbEntity entity);
/**
* Returns a SQL string that can be used to create database table corresponding to
* ent parameter.
*/
public String createTable(DbEntity entity);
/**
* Returns a DDL string to create a unique constraint over a set of columns.
*
* @since 1.1
*/
public String createUniqueConstraint(DbEntity source, Collection columns);
/**
* Returns a SQL string that can be used to create a foreign key constraint for the
* relationship.
*/
public String createFkConstraint(DbRelationship rel);
/**
* Returns an array of RDBMS types that can be used with JDBC type.
* Valid JDBC types are defined in java.sql.Types.
*/
public String[] externalTypesForJdbcType(int type);
/**
* Returns a map of ExtendedTypes that is used to translate values between Java and
* JDBC layer.
*
* @see org.objectstyle.cayenne.access.types.ExtendedType
*/
public ExtendedTypeMap getExtendedTypes();
/**
* Returns primary key generator associated with this DbAdapter.
*/
public PkGenerator getPkGenerator();
/**
* Creates and returns a DbAttribute based on supplied parameters (usually obtained
* from database meta data).
*
* @param name database column name
* @param typeName database specific type name, may be used as a hint to determine the
* right JDBC type.
* @param type JDBC column type
* @param size database column size (ignored if less than zero)
* @param precision database column precision (ignored if less than zero)
* @param allowNulls database column nullable parameter
*/
public DbAttribute buildAttribute(
String name,
String typeName,
int type,
int size,
int precision,
boolean allowNulls);
/**
* Binds an object value to PreparedStatement's numbered parameter.
*/
public void bindParameter(
PreparedStatement statement,
Object object,
int pos,
int sqlType,
int precision) throws SQLException, Exception;
/**
* Returns the name of the table type (as returned by
* DatabaseMetaData.getTableTypes) for a simple user table.
*/
public String tableTypeForTable();
/**
* Returns the name of the table type (as returned by
* DatabaseMetaData.getTableTypes) for a view table.
*/
public String tableTypeForView();
/**
* @deprecated Since 1.2 this method is obsolete and is ignored across Cayenne.
*/
public boolean shouldRunBatchQuery(
DataNode node,
Connection con,
BatchQuery query,
OperationObserver delegate) throws SQLException, Exception;
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