org.apache.empire.db.expr.column
Class DBFuncExpr
java.lang.Object
org.apache.empire.db.DBObject
org.apache.empire.db.DBExpr
org.apache.empire.db.DBColumnExpr
org.apache.empire.db.expr.column.DBAbstractFuncExpr
org.apache.empire.db.expr.column.DBFuncExpr
- All Implemented Interfaces:
- Serializable, ColumnExpr
public class DBFuncExpr
- extends DBAbstractFuncExpr
This class is used for performing various SQL functions on a column or column expression.
There is no need to explicitly create instances of this class.
Instead use any of the following functions:
DBColumnExpr.abs()
, DBColumnExpr.coalesce(Object)
, DBColumnExpr.convertTo(DataType)
,
DBColumnExpr.decode(java.util.Map, Object)
, DBColumnExpr.lower()
, DBColumnExpr.min()
,
DBColumnExpr.max()
, DBColumnExpr.month()
, DBColumnExpr.sum()
,
DBColumnExpr.trim()
, DBColumnExpr.upper()
, DBColumnExpr.year()
- See Also:
- Serialized Form
Constructor Summary |
DBFuncExpr(DBColumnExpr expr,
int phrase,
Object[] params,
DBColumn updateColumn,
boolean isAggregate,
DataType dataType)
Constructs a new DBFuncExpr object set the specified parameters to this object. |
DBFuncExpr(DBColumnExpr expr,
String template,
Object[] params,
DBColumn updateColumn,
boolean isAggregate,
DataType dataType)
Constructs a new DBFuncExpr object set the specified parameters to this object. |
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 java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
phrase
protected final int phrase
params
protected final Object[] params
template
protected String template
DBFuncExpr
public DBFuncExpr(DBColumnExpr expr,
int phrase,
Object[] params,
DBColumn updateColumn,
boolean isAggregate,
DataType dataType)
- Constructs a new DBFuncExpr object set the specified parameters to this object.
Do not use directly - use any of the DBColumnExpr.??? factory functions instead!
The sql function string is built from a string template.
The template string is identified by the phrase param and obtained from the driver.
- Parameters:
expr
- the DBColumnExpr objectphrase
- the SQL-phraseparams
- an array of params which will be replaced in the templateupdateColumn
- optional update column if any. This parameter may be nullisAggregate
- indicates whether the function is an aggregate function (sum, min, max, avg, ...)dataType
- indicates the data type of the function result
DBFuncExpr
public DBFuncExpr(DBColumnExpr expr,
String template,
Object[] params,
DBColumn updateColumn,
boolean isAggregate,
DataType dataType)
- Constructs a new DBFuncExpr object set the specified parameters to this object.
The sql function string is built from a string template.
The template string must contain a ? which is a placeholder for the column expression.
- Parameters:
expr
- the DBColumnExpr objecttemplate
- specifies a template for the expression. The template must contain a ? placeholder for the column expressionparams
- an array of params which will be replaced in the templateupdateColumn
- optional update column if any. This parameter may be nullisAggregate
- indicates whether the function is an aggregate function (sum, min, max, avg, ...)dataType
- indicates the data type of the function result
getFunctionName
protected String getFunctionName()
- Description copied from class:
DBAbstractFuncExpr
- returns the name of the function
- Specified by:
getFunctionName
in class DBAbstractFuncExpr
- Returns:
- the function name
addSQL
public void addSQL(StringBuilder sql,
long context)
- Creates the SQL-Command adds a function to the SQL-Command.
- Specified by:
addSQL
in class DBExpr
- Parameters:
sql
- the SQL-Commandcontext
- the current SQL-Command context
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