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java.lang.Object net.sf.basedb.core.query.ExpressionSelect
public class ExpressionSelect
A selection query element that selects an expression, optionally giving it an alias.
SELECT <expression> AS <alias> FROM ...
Selects.expression(Expression, String)
Field Summary | |
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private String |
alias
|
private Expression |
e1
|
private boolean |
useInDistinctCount
|
Constructor Summary | |
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ExpressionSelect(Expression e1,
String alias,
boolean useInDistinctCount)
|
Method Summary | |
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boolean |
equals(Object other)
This expression is equal to another ExpressionSelect if their child expressions and aliases are equal. |
String |
getAlias()
Get the alias of the selected expression. |
Collection<? extends QueryElement> |
getChildren()
Get the children of this query element or null if it has no children. |
Expression |
getExpression()
Get the expression object representing the selected expression. |
int |
hashCode()
|
String |
toQl(Query query,
DbControl dc)
Create a query language string of the query element. |
String |
toString()
|
boolean |
useInDistinctCount()
If this expression should be use in count distinct queries or not. |
Methods inherited from class java.lang.Object |
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clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Field Detail |
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private final Expression e1
private final String alias
private final boolean useInDistinctCount
Constructor Detail |
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ExpressionSelect(Expression e1, String alias, boolean useInDistinctCount)
Method Detail |
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public String toQl(Query query, DbControl dc) throws BaseException
QueryElement
Query.getQueryType()
method to find out which query language is wanted
in case the element requires different syntax for different languages.
toQl
in interface QueryElement
query
- The query that is about to be executeddc
- The DbControl
object used to execute the query
BaseException
- If there is any other errorpublic Collection<? extends QueryElement> getChildren()
QueryElement
AddExpression
has two children, the expression
beeing added.
getChildren
in interface QueryElement
public String getAlias()
Select
getAlias
in interface Select
public Expression getExpression()
Select
getExpression
in interface Select
public boolean useInDistinctCount()
Select
SELECT COUNT(DISTINCT expression)
useInDistinctCount
in interface Select
public String toString()
toString
in class Object
public boolean equals(Object other)
equals
in class Object
public int hashCode()
hashCode
in class Object
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