net.sf.basedb.core.dbengine
Class DefaultDbEngine

java.lang.Object
  net.sf.basedb.core.dbengine.AbstractDbEngine
      net.sf.basedb.core.dbengine.DefaultDbEngine

All Implemented Interfaces:

DbEngine

public class DefaultDbEngine
extends AbstractDbEngine

A default DbEngine that is selected if no other can be found. This probably has some issues with most databases.

Version:

2.0

Author:

nicklas

Last modified

$Date: 2011-11-25 13:07:04 +0100 (Fri, 25 Nov 2011) $

Constructor Summary

DefaultDbEngine()
Create DefaultDbEngine.

Method Summary

boolean	analyzeAfterBatchOperation() Return false.
boolean	caseInsensitiveComparison() Returns TRUE.
String	getAnalyzeTableSql(String catalog, String schema, String table) Return null.
String	getCreateForeignKeySql(String catalog, String schema, String table, String name, Set<String> columns, String refTable, Set<String> refColumns) Generates SQL that creates a foreign key constraint between two tables.
String	getCreateIndexSql(String catalog, String schema, String table, String name, Set<String> columns, boolean unique) Generates CREATE [UNIQUE] INDEX <name> ON <catalog>.
String	getCreatePrimaryKeySql(String catalog, String schema, String table, String name, Set<String> columns) Generate SQL to create a primary key for a table.
String	getDropForeignKeySql(String catalog, String schema, String table, String name) Generate ALTER TABLE <catalog>.
String	getDropIndexSql(String catalog, String schema, String table, String name, boolean unique) Generate DROP INDEX <catalog>.
String	getDropPrimaryKey(String catalog, String schema, String table, String name) Generate SQL that drops the primary key from a table.
String	getInsertAutoIncrementSql(PersistentClass pc) Return a SQL fragment that can be used in an INSERT INTO statement to generate an ID for new rows.
String	getOptimizeTableSql(String catalog, String schema, String table) Return null.

Methods inherited from class net.sf.basedb.core.dbengine.AbstractDbEngine

abs, castToDate, checkForInvalidNumberOperation, exp, getApproximateRowCountSql, getCaseSensitiveVarchar, getQuotedName, inspectSchemaGenerationSQL, isValidColumnName, isValidName, isValidTableName, ln, makeSafeCreateTable, power, rlike, selectOrderByColumnsIfDistinct, supportColumnAliasInGroupBy, supportColumnAliasInHaving, supportColumnAliasInOrderBy, supportsColumnAliasInWhere, useSavePointToContinueTransactionFromSqlFailure, useThetaJoin

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DefaultDbEngine

public DefaultDbEngine()

Create DefaultDbEngine.

Method Detail

getCreateIndexSql

public String getCreateIndexSql(String catalog,
                                String schema,
                                String table,
                                String name,
                                Set<String> columns,
                                boolean unique)

Generates CREATE [UNIQUE] INDEX <name> ON <catalog>.<schema>.<table> (<columns>) which should work for most databases.

Parameters:

catalog - The name of the catalog (database) where the table is located, or null if it is located in the current catalog

schema - The name of the schema where the table is located, or null if is located in the current schema

table - The name of the table

name - The name of the index to be created

columns - The name of the columns in the index

unique - If the index must contain unique values or not

Returns:

The SQL to execute

getDropIndexSql

public String getDropIndexSql(String catalog,
                              String schema,
                              String table,
                              String name,
                              boolean unique)

Generate DROP INDEX <catalog>.<schema>.<table>.<name>.

Parameters:

catalog - The name of the catalog (database) where the table is located, or null if it is located in the current catalog

schema - The name of the schema where the table is located, or null if is located in the current schema

table - The name of the table

name - The name of the index

unique - If the index contains unique values or not

Returns:

The SQL to execute

getDropForeignKeySql

public String getDropForeignKeySql(String catalog,
                                   String schema,
                                   String table,
                                   String name)

Generate ALTER TABLE <catalog>.<schema>.<table> DROP CONSTRAINT <name>

Parameters:

catalog - The name of the catalog (database) where the table is located, or null if it is located in the current catalog

schema - The name of the schema where the table is located, or null if is located in the current schema

table - The name of the table

name - The name of the foreign key

Returns:

The SQL to execute

Since:

3.0

getInsertAutoIncrementSql

public String getInsertAutoIncrementSql(PersistentClass pc)

Description copied from interface: DbEngine

Return a SQL fragment that can be used in an INSERT INTO statement to generate an ID for new rows.

Parameters:

pc - The persistent class

Returns:

Always "null" (assuming that the database knows how to generate the id)

analyzeAfterBatchOperation

public boolean analyzeAfterBatchOperation()

Return false.

getOptimizeTableSql

public String getOptimizeTableSql(String catalog,
                                  String schema,
                                  String table)

Return null.

Parameters:

catalog - The name of the catalog (database) where the table is located, or null if it is located in the current catalog

schema - The name of the schema where the table is located, or null if is located in the current schema

table - The name of the table to optimize

Returns:

The SQL to execute

See Also:

DbEngine.getAnalyzeTableSql(String, String, String)

getAnalyzeTableSql

public String getAnalyzeTableSql(String catalog,
                                 String schema,
                                 String table)

Return null.

Parameters:

catalog - The name of the catalog (database) where the table is located, or null if it is located in the current catalog

schema - The name of the schema where the table is located, or null if is located in the current schema

table - The name of the table to analyze

Returns:

The SQL to execute, or null if not supported

See Also:

DbEngine.getOptimizeTableSql(String, String, String)

caseInsensitiveComparison

public boolean caseInsensitiveComparison()

Returns TRUE.

Returns:

FALSE if comparisons are case sensitive (ABC != abc), TRUE if they are case insensitive (ABC = abc)

Since:

2.4

getCreateForeignKeySql

public String getCreateForeignKeySql(String catalog,
                                     String schema,
                                     String table,
                                     String name,
                                     Set<String> columns,
                                     String refTable,
                                     Set<String> refColumns)

Description copied from interface: DbEngine

Generates SQL that creates a foreign key constraint between two tables. Note! When calling this method, ensure that the Set:s with columns have a predictable iteration order!

Parameters:

catalog - The name of the catalog (database) where the tables are located, or null if it is located in the current catalog

schema - The name of the schema where the tables are located, or null if is located in the current schema

table - The name of the foreign key table

name - The name of the foreign key

columns - The columns that make up the foreign key

refTable - The table that is referenced by the foreign key

refColumns - The columns that are referenced by the foreign key

Returns:

The SQL to create the foreign key

getCreatePrimaryKeySql

public String getCreatePrimaryKeySql(String catalog,
                                     String schema,
                                     String table,
                                     String name,
                                     Set<String> columns)

Description copied from interface: DbEngine

Generate SQL to create a primary key for a table. Note! When calling this method, ensure that the column set have a predictable iteration order!

Parameters:

catalog - The name of the catalog (database) where the table is located, or null if it is located in the current catalog

schema - The name of the schema where the table is located, or null if is located in the current schema

table - The name of the table

name - The name of the primary key

columns - The name of the columns in the primary key

Returns:

The SQL to execute

getDropPrimaryKey

public String getDropPrimaryKey(String catalog,
                                String schema,
                                String table,
                                String name)

Description copied from interface: DbEngine

Generate SQL that drops the primary key from a table.

Parameters:

catalog - The name of the catalog (database) where the table is located, or null if it is located in the current catalog

schema - The name of the schema where the table is located, or null if is located in the current schema

table - The name of the table

name - The name of the primary key

Returns:

The SQL to execute