org.datanucleus.store.rdbms.sql
Class SQLJoin

java.lang.Object
  org.datanucleus.store.rdbms.sql.SQLJoin

public class SQLJoin
extends Object

Representation of a join in an SQL statement. The join is of a type (see ANSI SQL), and with inner/left outer/right outer is accompanied by join condition(s), joining from the source table to the target table via columns. Additionally other conditions can be applied to restrict the join (such as discriminator).

Nested Class Summary

static class

SQLJoin.JoinType

Constructor Summary

SQLJoin(SQLJoin.JoinType type, SQLTable tbl, SQLTable joinedTbl, BooleanExpression condition)
Constructor for a join.

Method Summary

BooleanExpression	getCondition() Accessor for the conditions of the join.
SQLTable	getJoinedTable()
SQLTable	getTable()
SQLJoin.JoinType	getType()
void	setType(SQLJoin.JoinType type)
String	toFromClause(RDBMSAdapter dba, boolean lock)
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

SQLJoin

public SQLJoin(SQLJoin.JoinType type,
               SQLTable tbl,
               SQLTable joinedTbl,
               BooleanExpression condition)

Constructor for a join.

Parameters:

type - Type of join (one of the defined types in this class).

tbl - Table to join to (required)

condition - Join condition

Method Detail

getType

public SQLJoin.JoinType getType()

setType

public void setType(SQLJoin.JoinType type)

getTable

public SQLTable getTable()

getJoinedTable

public SQLTable getJoinedTable()

getCondition

public BooleanExpression getCondition()

Accessor for the conditions of the join. These conditions can include

Returns:

The conditions

toString

public String toString()

Overrides:

toString in class Object

toFromClause

public String toFromClause(RDBMSAdapter dba,
                           boolean lock)