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

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

All Implemented Interfaces:

SQLMethod

public class StringSubstringMethod
extends AbstractSQLMethod

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.

Field Summary

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

clr, exprFactory, LOCALISER, stmt

Constructor Summary

StringSubstringMethod()

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

StringSubstringMethod

public StringSubstringMethod()

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