com.triactive.jdo.store
Class MSSQLServerAdapter

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

class MSSQLServerAdapter

extends DatabaseAdapter

Provides methods for adapting SQL language elements to the Microsoft SQL Server database.

Author:

Mike Martin

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

MSSQLServerAdapter(java.sql.DatabaseMetaData metadata) Constructs a Microsoft SQL Server 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	getSchemaName(java.sql.Connection conn)
java.lang.String	getVendorID()
NumericExpression	lengthMethod(CharacterExpression str) Returns the appropriate SQL expression for the JDOQL String.length() method.
ColumnInfo	newColumnInfo(java.sql.ResultSet rs) A factory for ColumnInfo objects.
TableExpression	newTableExpression(QueryStatement qs, Table table, SQLIdentifier rangeVar) Returns a new TableExpression object appropriate for this DBMS.
TypeInfo	newTypeInfo(java.sql.ResultSet rs) A factory for TypeInfo objects.
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()

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, getSQLState, getTypeInfo, getTypeInfo, getUnlimitedLengthPrecisionValue, includeOrderByColumnsInSelect, isEmbeddedType, isSQLKeyword, newDataStoreException, newForeignKeyInfo, newQueryStatement, newQueryStatement, parseKeywordList, storesLowerCaseIdentifiers, storesUpperCaseIdentifiers, supportsAlterTableDropConstraint, supportsNullsInCandidateKeys, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

MSSQLServerAdapter

protected MSSQLServerAdapter(java.sql.DatabaseMetaData metadata)

Constructs a Microsoft SQL Server 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

getSchemaName

public java.lang.String getSchemaName(java.sql.Connection conn)
                               throws java.sql.SQLException

Overrides:

getSchemaName in class DatabaseAdapter

Throws:

java.sql.SQLException

supportsBooleanComparison

public boolean supportsBooleanComparison()

Overrides:

supportsBooleanComparison in class DatabaseAdapter

supportsDeferredConstraints

public boolean supportsDeferredConstraints()

Overrides:

supportsDeferredConstraints in class DatabaseAdapter

newColumnInfo

public ColumnInfo newColumnInfo(java.sql.ResultSet rs)

Description copied from class: DatabaseAdapter

A factory for ColumnInfo objects. This method should always be used instead of directly constructing ColumnInfo objects in order to give the DatabaseAdapter an opportunity to modify and/or correct the metadata obtained from the JDBC driver. The column information object is constructed from the current row of the given result set. The ResultSet object passed must have been obtained from a call to DatabaseMetaData.getColumns().

The constructor only retrieves the values from the current row; the caller is required to advance to the next row with ResultSet.next().

Overrides:

newColumnInfo in class DatabaseAdapter

Parameters:

rs - The result set returned from DatabaseMetaData.getColumns().

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.

newTypeInfo

public TypeInfo newTypeInfo(java.sql.ResultSet rs)

Description copied from class: DatabaseAdapter

A factory for TypeInfo objects. This method should always be used instead of directly constructing TypeInfo objects in order to give the DatabaseAdapter an opportunity to modify and/or correct the metadata obtained from the JDBC driver. The type information object is constructed from the current row of the given result set. The ResultSet object passed must have been obtained from a call to DatabaseMetaData.getTypeInfo().

The constructor only retrieves the values from the current row; the caller is required to advance to the next row with ResultSet.next().

Overrides:

newTypeInfo in class DatabaseAdapter

Parameters:

rs - The result set returned from DatabaseMetaData.getTypeInfo().

Returns:

A TypeInfo object constructed from the current result set row, or null if the type indicated by this row should be excluded from use.

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.

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.