org.datanucleus.store.rdbms.sql.method

Class StringSubstring4Method

java.lang.Object

org.datanucleus.store.rdbms.sql.method.AbstractSQLMethod

org.datanucleus.store.rdbms.sql.method.StringSubstring4Method

All Implemented Interfaces:

SQLMethod

public class StringSubstring4Method
extends AbstractSQLMethod

Method for evaluating {strExpr}.substring(numExpr1 [,numExpr2]). Returns a StrignExpression that equates to

• SUBSTRING(strExpr, numExpr1+1)

  when no end position provided.

• SUBSTRING(strExpr, numExpr1+1, numExpr2-numExpr1)

  when end position provided.

Typically required by SQLServer.

Field Summary

Fields inherited from class org.datanucleus.store.rdbms.sql.method.AbstractSQLMethod

clr, exprFactory, stmt

Constructor Summary

Constructors

Constructor and Description
StringSubstring4Method()

Method Summary

Modifier and Type	Method and Description
SQLExpression	getExpression(SQLExpression expr, List<SQLExpression> args) Return the expression for this SQL function.

Methods inherited from class org.datanucleus.store.rdbms.sql.method.AbstractSQLMethod

getMappingForClass, setStatement

Methods inherited from class java.lang.Object

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

Constructor Detail

StringSubstring4Method

public StringSubstring4Method()

Method Detail

getExpression

public SQLExpression getExpression(SQLExpression expr,
                                   List<SQLExpression> args)

Description copied from interface: SQLMethod

Return the expression for this SQL function.

Parameters:

expr - The expression that it is invoked on

args - Arguments passed in

Returns:

The SQL expression using the SQL function