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

Class SimpleStringMethod

java.lang.Object

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

All Implemented Interfaces:

SQLMethod

Direct Known Subclasses:

StringToLowerMethod, StringToUpperMethod, StringTrimLeftMethod, StringTrimMethod, StringTrimRightMethod

public abstract class SimpleStringMethod
extends Object
implements SQLMethod

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

Constructor Summary

Constructors

Constructor	Description
SimpleStringMethod()

Method Summary

Modifier and Type	Method	Description
SQLExpression	getExpression(SQLStatement stmt, SQLExpression expr, List<SQLExpression> args)	Return the expression for this SQL function.
protected abstract String	getFunctionName()

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(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