er.extensions.eof

Class ERXObjectBinding

java.lang.Object

er.extensions.eof.ERXObjectBinding

All Implemented Interfaces:

ERXSQLBinding

public class ERXObjectBinding
extends Object
implements ERXSQLBinding

This class models an SQL binding based on a Java object.

When using this class to model a binding, the EOF SQL generation layer will not be able to inspect the model and obtain the correct value types and conversions. A best guess will be made based on the class of the wrapped object. This class supports the five basic types EOF supports (String, BigDecimal, Number, NSData and NSTimestamp). Also, boolean values true and false are converted to "true" and "false" strings. If boolean representation is different on the database you are using (like integers) you have to handle it yourself by wrapping an object of the appropriate class.

A note about SQL generation: due to the internal architecture of database plugins, this class will not be able to ask the plugin for an appropriate placeholder string for the binding values. This won't matter for databases where the placeholder string is "?". However, some databases, like PostgreSQL 7.4 and older, require the placeholder string to contain the value type, like "?::varchar(1000)". Using this class may cause problems and unexpected results on such databases. If that's the case, consider using ERXKeyValueBinding.

Constructor Summary

Constructors

Constructor and Description
ERXObjectBinding(Object value) Creates a new object binding wrapper for the given object.

Method Summary

Modifier and Type	Method and Description
String	sqlStringForBindingOnExpression(com.webobjects.eoaccess.EOSQLExpression expression) Registers the binding on a given SQL expression, and obtains the binding placeholder string for the binding value.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ERXObjectBinding

public ERXObjectBinding(Object value)

Creates a new object binding wrapper for the given object.

value must be an instance of the following classes (or any subsclass of these): String, BigDecimal, Number, NSData, NSTimestamp.

Parameters:

value - Object to be wrapped

Method Detail

sqlStringForBindingOnExpression

public String sqlStringForBindingOnExpression(com.webobjects.eoaccess.EOSQLExpression expression)

Description copied from interface: ERXSQLBinding

Registers the binding on a given SQL expression, and obtains the binding placeholder string for the binding value.

Specified by:

sqlStringForBindingOnExpression in interface ERXSQLBinding

Parameters:

expression - EOSQLExpression being built

Returns:

the SQL placeholder string for the used DB, usually "?"