Package org.apache.empire.db

Class DBGeneratedValue.DBFuncGeneratedValue

java.lang.Object

org.apache.empire.db.DBObject

org.apache.empire.db.DBExpr

org.apache.empire.db.DBGeneratedValue

org.apache.empire.db.DBGeneratedValue.DBFuncGeneratedValue

Enclosing class:

DBGeneratedValue

public static class DBGeneratedValue.DBFuncGeneratedValue
extends DBGeneratedValue

DBFuncGeneratedValue Auto-generates a record value from other record fields The template must contain the column names wrapped in square brackets like e.g. "normalize([name])" or "[lastName]+', '+[firstName]"

Author:

doebele

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.empire.db.DBGeneratedValue

DBGeneratedValue.DBFuncGeneratedValue, DBGeneratedValue.DBTriggerGeneratedValue

Field Summary

Fields inherited from class org.apache.empire.db.DBGeneratedValue

db, log

Fields inherited from class org.apache.empire.db.DBExpr

CTX_ALIAS, CTX_ALL, CTX_DEFAULT, CTX_FULLNAME, CTX_NAME, CTX_NOPARENTHESIS, CTX_VALUE

Constructor Summary

Constructors

Constructor	Description
DBFuncGeneratedValue(DBTable table, String template)

Method Summary

Modifier and Type	Method	Description
void	addReferencedColumns(Set<DBColumn> list)	Internal function to obtain all DBColumnExpr-objects used by this expression.
void	addSQL(DBSQLBuilder sql, long context)	Used to build the SQL command.
Object	eval(Record record)	Evaluates a record and returns the generated value
boolean	isModified(Record record)	Returns true if the value was modified and thus needs to be be updated in the record

Methods inherited from class org.apache.empire.db.DBGeneratedValue

byFunction, byTrigger, getDatabase

Methods inherited from class org.apache.empire.db.DBObject

checkParamNull

Methods inherited from class java.lang.Object

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

Constructor Details

DBFuncGeneratedValue

public DBFuncGeneratedValue(DBTable table,
 String template)

Method Details

isModified

public boolean isModified(Record record)

Description copied from class: DBGeneratedValue

Returns true if the value was modified and thus needs to be be updated in the record

Specified by:

isModified in class DBGeneratedValue

Parameters:

record - the record for which to check

Returns:

true if the value was modified and needs to be be updated

eval

public Object eval(Record record)

Description copied from class: DBGeneratedValue

Evaluates a record and returns the generated value

Specified by:

eval in class DBGeneratedValue

Parameters:

record - the record for which to evaluate

Returns:

the generated value

addReferencedColumns

public void addReferencedColumns(Set<DBColumn> list)

Description copied from class: DBExpr

Internal function to obtain all DBColumnExpr-objects used by this expression.

Specified by:

addReferencedColumns in class DBExpr

Parameters:

list - list to which all used column expressions must be added

addSQL

public void addSQL(DBSQLBuilder sql,
 long context)

Description copied from class: DBExpr

Used to build the SQL command. SQL for this expression must be appended to StringBuilder.

Specified by:

addSQL in class DBExpr

Parameters:

sql - the string buffer used to build the sql command

context - context flag for this SQL-Command (see CTX_??? constants).