Package net.sf.basedb.core.query
Class CountExpression
- java.lang.Object
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- net.sf.basedb.core.query.CountExpression
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- All Implemented Interfaces:
Expression
,QueryElement
public class CountExpression extends Object implements Expression
Count the number of values: COUNT(e)- Version:
- 2.0
- Author:
- Nicklas
- See Also:
Aggregations.count(Expression, boolean)
- Last modified
- $Date: 2012-09-14 09:28:35 +0200 (fr, 14 sep 2012) $
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Field Summary
Fields Modifier and Type Field Description private boolean
distinct
private Expression
e
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Constructor Summary
Constructors Constructor Description CountExpression(Expression e, boolean distinct)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
equals(Object other)
This expression is equal to another CountExpression if their child expressions are equal and have the same DISTINCT setting.Collection<? extends QueryElement>
getChildren()
Get the children of this query element or null if it has no children.int
hashCode()
String
toQl(Query query, DbControl dc)
Create a query language string of the query element.String
toString()
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Field Detail
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e
private final Expression e
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distinct
private final boolean distinct
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Constructor Detail
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CountExpression
CountExpression(Expression e, boolean distinct)
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Method Detail
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toQl
public String toQl(Query query, DbControl dc) throws BaseException
Description copied from interface:QueryElement
Create a query language string of the query element. Use theQuery.getQueryType()
method to find out which query language is wanted in case the element requires different syntax for different languages.- Specified by:
toQl
in interfaceQueryElement
- Parameters:
query
- The query that is about to be executeddc
- TheDbControl
object used to execute the query- Throws:
BaseException
- If there is any other error
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getChildren
public Collection<? extends QueryElement> getChildren()
Description copied from interface:QueryElement
Get the children of this query element or null if it has no children. For example theAddExpression
has two children, the expression beeing added.- Specified by:
getChildren
in interfaceQueryElement
- Returns:
- The expression to count
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equals
public boolean equals(Object other)
This expression is equal to another CountExpression if their child expressions are equal and have the same DISTINCT setting.
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