|
||||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Objectorg.apache.empire.db.DBObject
org.apache.empire.db.DBExpr
org.apache.empire.db.DBColumnExpr
org.apache.empire.db.expr.column.DBCalcExpr
public class DBCalcExpr
This class is used for performing calculations in SQL
It handles the mathematical operations ("+", "-", "*", "/") for the current column.
There is no need to explicitly create instances of this class.
Instead use DBColumnExpr.plus(Object)
, DBColumnExpr.minus(Object)
,
DBColumnExpr.multiplyWith(Object)
, DBColumnExpr.divideBy(Object)
Field Summary |
---|
Fields inherited from class org.apache.empire.db.DBColumnExpr |
---|
attributes, beanPropertyName, DBCOLATTR_TITLE, DBCOLATTR_TYPE, options |
Fields inherited from class org.apache.empire.db.DBExpr |
---|
CTX_ALIAS, CTX_ALL, CTX_DEFAULT, CTX_FULLNAME, CTX_NAME, CTX_NOPARENTHESES, CTX_VALUE |
Constructor Summary | |
---|---|
DBCalcExpr(DBColumnExpr expr,
String op,
Object value)
Constructs a DBCalcExpr object Sets the mathematical operations ("+", "-", "*", "/") for the specified DBColumnExpr object and value. |
Method Summary | |
---|---|
void |
addReferencedColumns(Set<DBColumn> list)
Internal function to obtain all DBColumnExpr-objects used by this expression. |
void |
addSQL(StringBuilder buf,
long context)
Creates the SQL-Command adds the mathematical operations for the specified DBColumnExpr object and value to the. |
Element |
addXml(Element parent,
long flags)
This function set the specified mathematical operations to the XML tag. |
DBDatabase |
getDatabase()
Returns the current DBDatabase object. |
DataType |
getDataType()
Returns the data type: DBDataType.DECIMAL. |
String |
getName()
Returns the given expression name. |
DBColumn |
getUpdateColumn()
returns null |
boolean |
isAggregate()
Always returns false since CalcExpressions cannot be aggregates. |
String |
toString()
|
Methods inherited from class org.apache.empire.db.DBColumnExpr |
---|
abs, append, as, as, asc, avg, cmp, coalesce, convertTo, convertTo, count, countDistinct, day, decode, decode, decode, decode, decode, decode, desc, detectDataType, divideBy, getAttribute, getBeanPropertyName, getControlType, getExprFromPhrase, getExprFromPhrase, getOptions, getSourceColumn, getTitle, in, indexOf, indexOf, indexOf, is, isBetween, isGreaterThan, isLessOrEqual, isMoreOrEqual, isNot, isNotBetween, isSmallerThan, length, like, like, likeLower, likeUpper, lower, max, min, minus, minus, month, multiplyWith, notIn, notLike, nvl, parenthesis, plus, plus, replace, reverse, round, setAttribute, setBeanPropertyName, setControlType, setOptions, setTitle, substring, substring, substring, substring, substring, substring, sum, toChar, toChar, trim, trimLeft, trimRight, trunc, upper, when, year |
Methods inherited from class org.apache.empire.db.DBExpr |
---|
getObjectValue, getValueClass |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
---|
public DBCalcExpr(DBColumnExpr expr, String op, Object value)
expr
- an DBColumnExpr object, one columnop
- the mathematical operation ("+", "-", "*" or "/")value
- the multiply, divide, summate or subtract valueMethod Detail |
---|
public DBDatabase getDatabase()
getDatabase
in class DBObject
public DataType getDataType()
getDataType
in interface ColumnExpr
getDataType
in class DBColumnExpr
DataType
public String getName()
getName
in interface ColumnExpr
getName
in class DBColumnExpr
public Element addXml(Element parent, long flags)
addXml
in class DBColumnExpr
parent
- the parent element to which to append the column descriptionflags
- currently not used
public DBColumn getUpdateColumn()
getUpdateColumn
in class DBColumnExpr
public boolean isAggregate()
isAggregate
in class DBColumnExpr
public void addReferencedColumns(Set<DBColumn> list)
DBExpr
addReferencedColumns
in class DBExpr
list
- list to which all used column expressions must be addedDBExpr.addReferencedColumns(Set)
public void addSQL(StringBuilder buf, long context)
addSQL
in class DBExpr
buf
- the SQL statmentcontext
- the current SQL-Command contextpublic String toString()
toString
in class Object
|
||||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |