Package org.datanucleus.store.rdbms.sql.method

Class StringSubstring5Method

java.lang.Object

org.datanucleus.store.rdbms.sql.method.StringSubstring5Method

All Implemented Interfaces:

SQLMethod

public class StringSubstring5Method
extends Object
implements SQLMethod

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

• SUBSTRING(strExpr FROM CAST(numExpr1+1 AS INTEGER))

  when no end position provided.

• SUBSTRING(strExpr FROM CAST(numExpr1+1 AS INTEGER) FOR CAST(numExpr2-numExpr1 AS INTEGER))

  when end position provided.

Constructor Summary

Constructors

Constructor	Description
StringSubstring5Method()

Method Summary

Modifier and Type	Method	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

StringSubstring5Method

public StringSubstring5Method()

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