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

Nested Classes

Modifier and Type	Class and Description
static class	SQLJoin.JoinType

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
void	addAndCondition(BooleanExpression expr) Method to update the join "condition" to AND the provided expression.
BooleanExpression	getCondition() Accessor for the conditions of the join.
SQLTable	getJoinedTable()
static SQLJoin.JoinType	getJoinTypeForJoinExpressionType(org.datanucleus.query.expression.JoinExpression.JoinType ejt)
SQLTable	getTable()
SQLJoin.JoinType	getType()
void	setType(SQLJoin.JoinType type)
SQLText	toSQLText(DatastoreAdapter 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)

joinedTbl - Table we join to

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

addAndCondition

public void addAndCondition(BooleanExpression expr)

Method to update the join "condition" to AND the provided expression.

Parameters:

expr - The expression to add to the join "condition"

toString

public String toString()

Overrides:

toString in class Object

toSQLText

public SQLText toSQLText(DatastoreAdapter dba,
                         boolean lock)

getJoinTypeForJoinExpressionType

public static SQLJoin.JoinType getJoinTypeForJoinExpressionType(org.datanucleus.query.expression.JoinExpression.JoinType ejt)