public class DBCountExpr extends DBColumnExpr
There is no need to explicitly create instances of this class.
Instead use or @link DBColumnExpr#count()
attributes, beanPropertyName, DBCOLATTR_TITLE, DBCOLATTR_TYPE, optionsCTX_ALIAS, CTX_ALL, CTX_DEFAULT, CTX_FULLNAME, CTX_NAME, CTX_NOPARENTHESES, CTX_VALUE| Constructor and Description |
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DBCountExpr(DBColumnExpr expr,
boolean distinct)
Constructs a DBCountExpr.
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DBCountExpr(DBRowSet rowset)
Constructs a DBCountExpr.
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| Modifier and Type | Method and Description |
|---|---|
void |
addReferencedColumns(Set<DBColumn> list)
Internal function to obtain all DBColumnExpr-objects used by this expression.
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void |
addSQL(StringBuilder sql,
long context)
Creates the SQL-Command adds the String "count(*)" to the SQL-Command.
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Element |
addXml(Element parent,
long flags)
this adds the column description to the parent element
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DBDatabase |
getDatabase()
Returns the current DBDatabase object.
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DataType |
getDataType()
Returns the data type: DT_INTEGER.
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String |
getName()
Returns the String "count".
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DBColumn |
getUpdateColumn()
Returns null.
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boolean |
isAggregate()
Returns true since the count function is an aggregate function.
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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, yeargetObjectValue, getValueClasspublic DBCountExpr(DBRowSet rowset)
rowset - the rowsetpublic DBCountExpr(DBColumnExpr expr, boolean distinct)
expr - the columndistinct - set true for distinct countpublic DBDatabase getDatabase()
getDatabase in class DBObjectpublic DataType getDataType()
getDataType in interface ColumnExprgetDataType in class DBColumnExprDataTypepublic String getName()
getName in interface ColumnExprgetName in class DBColumnExprpublic DBColumn getUpdateColumn()
getUpdateColumn in class DBColumnExprpublic boolean isAggregate()
isAggregate in class DBColumnExprpublic void addReferencedColumns(Set<DBColumn> list)
DBExpraddReferencedColumns in class DBExprlist - list to which all used column expressions must be addedDBExpr.addReferencedColumns(Set)public void addSQL(StringBuilder sql, long context)
public Element addXml(Element parent, long flags)
addXml in class DBColumnExprparent - the parent element to which to append the column descriptionflags - currently not usedCopyright © 2008–2015 Apache Software Foundation. All rights reserved.