Package org.apache.empire.db

Class DBExpr

java.lang.Object

org.apache.empire.db.DBObject

org.apache.empire.db.DBExpr

Direct Known Subclasses:

DBCmdParam, DBColumnExpr, DBCommandExpr, DBCompareExpr, DBGeneratedValue, DBJoinExpr, DBOrderByExpr, DBRowSet, DBSetExpr

public abstract class DBExpr
extends DBObject

This abstract class is the base class for all database expression classes (e.g. DBAliasExpr or DBCalsExpr)

Field Summary

Fields

Modifier and Type	Field	Description
static final long	CTX_ALIAS
static final long	CTX_ALL
static final long	CTX_DEFAULT
static final long	CTX_FULLNAME
static final long	CTX_NAME
static final long	CTX_NOPARENTHESIS
static final long	CTX_VALUE

Constructor Summary

Constructors

Constructor	Description
DBExpr()

Method Summary

Modifier and Type	Method	Description
abstract void	addReferencedColumns(Set<DBColumn> list)	Internal function to obtain all DBColumnExpr-objects used by this expression.
abstract void	addSQL(DBSQLBuilder sql, long context)	Used to build the SQL command.

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

checkParamNull, getDatabase

Methods inherited from class java.lang.Object

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

Field Details

CTX_DEFAULT

public static final long CTX_DEFAULT

See Also:

• Constant Field Values

CTX_ALL

public static final long CTX_ALL

See Also:

• Constant Field Values

CTX_NAME

public static final long CTX_NAME

See Also:

• Constant Field Values

CTX_FULLNAME

public static final long CTX_FULLNAME

See Also:

• Constant Field Values

CTX_VALUE

public static final long CTX_VALUE

See Also:

• Constant Field Values

CTX_ALIAS

public static final long CTX_ALIAS

See Also:

• Constant Field Values

CTX_NOPARENTHESIS

public static final long CTX_NOPARENTHESIS

See Also:

• Constant Field Values

Constructor Details

DBExpr

public DBExpr()

Method Details

addSQL

public abstract void addSQL(DBSQLBuilder sql,
 long context)

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

Parameters:

sql - the string buffer used to build the sql command

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

addReferencedColumns

public abstract void addReferencedColumns(Set<DBColumn> list)

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

Parameters:

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