com.orientechnologies.orient.core.sql.functions.conversion

Class OSQLMethodBeforeUpdate

java.lang.Object

com.orientechnologies.orient.core.sql.method.misc.OAbstractSQLMethod

com.orientechnologies.orient.core.sql.functions.conversion.OSQLMethodBeforeUpdate

All Implemented Interfaces:

OSQLMethod, Comparable<OSQLMethod>

public class OSQLMethodBeforeUpdate
extends OAbstractSQLMethod

ONLY FOR LIVE QUERY. Returns the value of current record (as an OResult) before it was updated. Null if the record is new
eg. on update, get only records whose "name" attribute was update db.live("select from Person where @this.beforeUpdate().name != name

Author:

Luigi Dell'Aquila (l.dellaquila--(at)--orientdb.com)

Field Summary

Fields

Modifier and Type	Field and Description
static String	NAME

Constructor Summary

Constructors

Constructor and Description
OSQLMethodBeforeUpdate()

Method Summary

Modifier and Type	Method and Description
Object	execute(Object iThis, OIdentifiable iCurrentRecord, OCommandContext iContext, Object ioResult, Object[] iParams) Process a record.
String	getSyntax() Returns a convinient SQL String representation of the method.

Methods inherited from class com.orientechnologies.orient.core.sql.method.misc.OAbstractSQLMethod

compareTo, evaluateParameters, getMaxParams, getMinParams, getName, getParameterValue, toString

Methods inherited from class java.lang.Object

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

Field Detail

NAME

public static final String NAME

See Also:

Constant Field Values

Constructor Detail

OSQLMethodBeforeUpdate

public OSQLMethodBeforeUpdate()

Method Detail

getSyntax

public String getSyntax()

Description copied from interface: OSQLMethod

Returns a convinient SQL String representation of the method.

Example :

  field.myMethod( param1, param2, [optionalParam3])
 

This text will be used in exception messages.

Specified by:

getSyntax in interface OSQLMethod

Overrides:

getSyntax in class OAbstractSQLMethod

Returns:

String , never null.

execute

public Object execute(Object iThis,
                      OIdentifiable iCurrentRecord,
                      OCommandContext iContext,
                      Object ioResult,
                      Object[] iParams)

Description copied from interface: OSQLMethod

Process a record.

iCurrentRecord - : current record

iContext - execution context

ioResult - : field value

iParams - : function parameters, number is ensured to be within minParams and maxParams.

Returns:

evaluation result