Package net.sf.basedb.core
Class ExtraValueJoin
java.lang.Object
net.sf.basedb.core.ExtraValueJoin
- All Implemented Interfaces:
Join
,QueryElement
Represents a join to an extra value in a dynamic query:
leftTable JOIN extraValueTable ON ...
This class is used by, for example, DynamicSpotQuery.joinExtraValue(ExtraValue, JoinType)
to create the
Join
query element that is needed. After the extra value
has been join it can be used in expressions in the query.
- Version:
- 2.0
- Author:
- Nicklas
- See Also:
- Last modified
- $Date: 2012-09-14 09:28:35 +0200 (fr, 14 sep 2012) $
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Field Summary
Modifier and TypeFieldDescriptionprivate final VirtualColumn[]
private final ExtraValue
private final JoinType
private final VirtualTable
private final VirtualTable
private final VirtualDb
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Constructor Summary
ConstructorDescriptionExtraValueJoin
(ExtraValue extraValue, JoinType joinType) Create a new join using the root entity table as the left table. -
Method Summary
Modifier and TypeMethodDescriptionboolean
This join is equal to another ExtraValueJoin if they join to the same extra value with the same join type.Collection<? extends QueryElement>
Get the children of this query element or null if it has no children.getThetaJoin
(Query query, DbControl dc) getThetaJoinCondition
(Query query, DbControl dc) int
hashCode()
Create a query language string of the query element.toString()
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Field Details
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extraValue
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vdb
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joinType
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left
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right
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columns
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Constructor Details
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ExtraValueJoin
ExtraValueJoin(ExtraValue extraValue, JoinType joinType) Create a new join using the root entity table as the left table.SELECT ... FROM rootTable JOIN extraValueTable
.The extra value table and which columns should be used in the join is found by examining the extra value properties, ie. value type and coordinate type.
- Parameters:
extraValue
- The extra value to joinjoinType
- The type of join
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Method Details
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toQl
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
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:
- Always null
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getThetaJoin
- Specified by:
getThetaJoin
in interfaceJoin
- Throws:
BaseException
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getThetaJoinCondition
- Specified by:
getThetaJoinCondition
in interfaceJoin
- Throws:
BaseException
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toString
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equals
This join is equal to another ExtraValueJoin if they join to the same extra value with the same join type. -
hashCode
public int hashCode()
-