org.datanucleus.store.rdbms.sql.method
Class StringSubstring3Method

java.lang.Object
  org.datanucleus.store.rdbms.sql.method.AbstractSQLMethod
      org.datanucleus.store.rdbms.sql.method.StringSubstring3Method

All Implemented Interfaces:

SQLMethod

public class StringSubstring3Method
extends AbstractSQLMethod

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

• SUBSTR(strExpr, numExpr1+1)

  when no end position provided.

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

  when end position provided.

Field Summary

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

clr, exprFactory, LOCALISER, stmt

Constructor Summary

StringSubstring3Method()

Method Summary

SQLExpression

getExpression(SQLExpression expr, List 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

StringSubstring3Method

public StringSubstring3Method()

Method Detail

getExpression

public SQLExpression getExpression(SQLExpression expr,
                                   List 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