org.datanucleus.store.rdbms.sql.method

Class StringSubstring4Method

java.lang.Object

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

All Implemented Interfaces:

SQLMethod

public class StringSubstring4Method
extends Object
implements SQLMethod

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.

Constructor Summary

Constructors

Constructor and Description
StringSubstring4Method()

Method Summary

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

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(SQLStatement stmt,
                                   SQLExpression expr,
                                   List<SQLExpression> args)

Description copied from interface: SQLMethod

Return the expression for this SQL function.

Specified by:

getExpression in interface SQLMethod

Parameters:

stmt - SQLStatement that this expression is for

expr - The expression that it is invoked on

args - Arguments passed in

Returns:

The SQL expression using the SQL function