com.triactive.jdo.store
Class FirebirdAdapter

java.lang.Object
  com.triactive.jdo.store.DatabaseAdapter
      com.triactive.jdo.store.FirebirdAdapter

class FirebirdAdapter

extends DatabaseAdapter

Provides methods for adapting SQL language elements to the Firebird database.

Author:

David Jencks

See Also:

DatabaseAdapter

Field Summary

Fields inherited from class com.triactive.jdo.store.DatabaseAdapter

databaseMajorVersion, databaseMinorVersion, databaseProductName, databaseProductVersion, identifierQuoteString, keywords, maxColumnNameLength, maxConstraintNameLength, maxIndexNameLength, maxTableNameLength, storesLowerCaseIdentifiers, storesUpperCaseIdentifiers, typeMappings, typesByTypeNumber

Constructor Summary

protected

FirebirdAdapter(java.sql.DatabaseMetaData metadata) Constructs a Firebird adapter based on the given JDBC metadata.

Method Summary

java.lang.String	getDropTableStatement(BaseTable table) Returns the appropriate SQL to drop the given table.
java.lang.String	getVendorID()
NumericExpression	lengthMethod(CharacterExpression str) Returns the appropriate SQL expression for the JDOQL String.length() method.
TableExpression	newTableExpression(QueryStatement qs, Table table, SQLIdentifier rangeVar) Returns a new TableExpression object appropriate for this DBMS.
CharacterExpression	substringMethod(CharacterExpression str, NumericExpression begin) Returns the appropriate SQL expression for the JDOQL String.substring(str,begin) method.
CharacterExpression	substringMethod(CharacterExpression str, NumericExpression begin, NumericExpression end) Returns the appropriate SQL expression for the JDOQL String.substring(str,begin,end) method.
boolean	supportsBooleanComparison()
boolean	supportsDeferredConstraints()
boolean	supportsNullsInCandidateKeys()

Methods inherited from class com.triactive.jdo.store.DatabaseAdapter

closeConnection, createIndexesBeforeForeignKeys, createTypeInfo, getAddCandidateKeyStatement, getAddForeignKeyStatement, getAddPrimaryKeyStatement, getConnection, getCreateIndexStatement, getCreateTableStatement, getDropViewStatement, getIdentifierQuoteString, getInstance, getMapping, getMapping, getMapping, getMappingClass, getMaxColumnNameLength, getMaxConstraintNameLength, getMaxIndexNameLength, getMaxTableNameLength, getSchemaName, getSQLState, getTypeInfo, getTypeInfo, getUnlimitedLengthPrecisionValue, includeOrderByColumnsInSelect, isEmbeddedType, isSQLKeyword, newColumnInfo, newDataStoreException, newForeignKeyInfo, newQueryStatement, newQueryStatement, newTypeInfo, parseKeywordList, storesLowerCaseIdentifiers, storesUpperCaseIdentifiers, supportsAlterTableDropConstraint, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

FirebirdAdapter

protected FirebirdAdapter(java.sql.DatabaseMetaData metadata)

Constructs a Firebird adapter based on the given JDBC metadata.

Parameters:

metadata - the database metadata.

Method Detail

getVendorID

public java.lang.String getVendorID()

Overrides:

getVendorID in class DatabaseAdapter

getDropTableStatement

public java.lang.String getDropTableStatement(BaseTable table)

Description copied from class: DatabaseAdapter

Returns the appropriate SQL to drop the given table. It should return something like:

 DROP TABLE FOO CASCADE
 

Overrides:

getDropTableStatement in class DatabaseAdapter

Parameters:

table - The table to drop.

Returns:

The text of the SQL statement.

supportsDeferredConstraints

public boolean supportsDeferredConstraints()

Overrides:

supportsDeferredConstraints in class DatabaseAdapter

supportsBooleanComparison

public boolean supportsBooleanComparison()

Overrides:

supportsBooleanComparison in class DatabaseAdapter

supportsNullsInCandidateKeys

public boolean supportsNullsInCandidateKeys()

Overrides:

supportsNullsInCandidateKeys in class DatabaseAdapter

newTableExpression

public TableExpression newTableExpression(QueryStatement qs,
                                          Table table,
                                          SQLIdentifier rangeVar)

Description copied from class: DatabaseAdapter

Returns a new TableExpression object appropriate for this DBMS. This should be an instance of one of the three built-in styles of table expression:

• TableExprAsJoins
• TableExprAsSubjoins
• TableExprAsSubquery

TableExprAsSubjoins is the default, which arguably produces the most readable SQL but doesn't work on all DBMS's. TableExprAsSubjoins should work anywhere, but may be less efficient.

Overrides:

newTableExpression in class DatabaseAdapter

Parameters:

qs - The query statement in which the table expression will be included.

table - The main table in the expression.

rangeVar - The SQL alias, or "range variable", to assign to the expression or to the main table.

lengthMethod

public NumericExpression lengthMethod(CharacterExpression str)

Description copied from class: DatabaseAdapter

Returns the appropriate SQL expression for the JDOQL String.length() method. It should return something like:

 CHAR_LENGTH(str)
 

Overrides:

lengthMethod in class DatabaseAdapter

Parameters:

str - The argument to the length() method.

Returns:

The text of the SQL expression.

substringMethod

public CharacterExpression substringMethod(CharacterExpression str,
                                           NumericExpression begin)

Description copied from class: DatabaseAdapter

Returns the appropriate SQL expression for the JDOQL String.substring(str,begin) method. It should return something like:

 SUBSTRING(str FROM begin)
 

Note that the value of begin is base 0 (Java-style), while most SQL string functions use base 1.

Overrides:

substringMethod in class DatabaseAdapter

Parameters:

str - The first argument to the substring() method.

begin - The second argument to the substring() method.

Returns:

The text of the SQL expression.

substringMethod

public CharacterExpression substringMethod(CharacterExpression str,
                                           NumericExpression begin,
                                           NumericExpression end)

Description copied from class: DatabaseAdapter

Returns the appropriate SQL expression for the JDOQL String.substring(str,begin,end) method. It should return something like:

 SUBSTRING(str FROM begin FOR len)
 

Note that the value of begin is base 0 (Java-style), while most SQL string functions use base 1. Note also that an end position is given, while most SQL substring functions take a length.

Overrides:

substringMethod in class DatabaseAdapter

Parameters:

str - The first argument to the substring() method.

begin - The second argument to the substring() method.

end - The third argument to the substring() method.

Returns:

The text of the SQL expression.