org.datanucleus.store.rdbms.sql.method

Class StringSubstringMethod

java.lang.Object

org.datanucleus.store.rdbms.sql.method.StringSubstringMethod

All Implemented Interfaces:

SQLMethod

public class StringSubstringMethod
extends Object
implements SQLMethod

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

• SUBSTRING(strExpr FROM numExpr1+1)

  when no end position provided.

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

  when end position provided.

Constructor Summary

Constructors

Constructor and Description
StringSubstringMethod()

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

StringSubstringMethod

public StringSubstringMethod()

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