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

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

All Implemented Interfaces:

SQLMethod

Direct Known Subclasses:

StringToLowerMethod, StringToUpperMethod, StringTrimLeftMethod, StringTrimMethod, StringTrimRightMethod

public abstract class SimpleStringMethod
extends AbstractSQLMethod

Expression handler to invoke an SQL String function that takes in an expression.

• If the expression is a StringExpression will returns a StringExpression

  {functionName}({stringExpr})

  and args aren't used
• If the expression is null will return a StringExpression

  {functionName}({args})

  and expr isn't used

Field Summary

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

clr, exprFactory, LOCALISER, stmt

Constructor Summary

SimpleStringMethod()

Method Summary

SQLExpression	getExpression(SQLExpression expr, List args) Return the expression for this SQL function.
protected abstract String	getFunctionName()

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

SimpleStringMethod

public SimpleStringMethod()

Method Detail

getFunctionName

protected abstract String getFunctionName()

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