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java.lang.Objectorg.h2.expression.Expression
org.h2.expression.Subquery
public class Subquery
A query returning a single value. Subqueries are used inside other statements.
Constructor Summary | |
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Subquery(Query query)
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Method Summary | |
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int |
getCost()
Estimate the cost to process the expression. |
int |
getDisplaySize()
Get the display size of this expression. |
long |
getPrecision()
Get the precision of this expression. |
Query |
getQuery()
|
int |
getScale()
Get the scale of this expression. |
java.lang.String |
getSQL()
Get the SQL statement of this expression. |
int |
getType()
Return the data type. |
Value |
getValue(Session session)
Return the resulting value for the current row. |
boolean |
isEverything(ExpressionVisitor visitor)
Check if this expression and all sub-expressions can fulfill a criteria. |
void |
mapColumns(ColumnResolver resolver,
int level)
Map the columns of the resolver to expression columns. |
Expression |
optimize(Session session)
Try to optimize the expression. |
void |
setEvaluatable(TableFilter tableFilter,
boolean b)
Tell the expression columns whether the table filter can return values now. |
void |
updateAggregate(Session session)
Update an aggregate value. |
Methods inherited from class org.h2.expression.Expression |
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addFilterConditions, createIndexConditions, getAlias, getBooleanValue, getColumnName, getNonAliasExpression, getNotIfPossible, getNullable, getSchemaName, getTableAlias, getTableName, isAutoIncrement, isConstant, isEverything, isValueSet, isWildcard, optimizeInJoin, toString |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public Subquery(Query query)
Method Detail |
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public Value getValue(Session session) throws java.sql.SQLException
Expression
getValue
in class Expression
session
- the session
java.sql.SQLException
public int getType()
Expression
getType
in class Expression
public void mapColumns(ColumnResolver resolver, int level) throws java.sql.SQLException
Expression
mapColumns
in class Expression
resolver
- the column resolverlevel
- the subquery nesting level
java.sql.SQLException
public Expression optimize(Session session) throws java.sql.SQLException
Expression
optimize
in class Expression
session
- the session
java.sql.SQLException
public void setEvaluatable(TableFilter tableFilter, boolean b)
Expression
setEvaluatable
in class Expression
tableFilter
- the table filterb
- true if the table filter can return valuepublic int getScale()
Expression
getScale
in class Expression
public long getPrecision()
Expression
getPrecision
in class Expression
public int getDisplaySize()
Expression
getDisplaySize
in class Expression
public java.lang.String getSQL()
Expression
getSQL
in class Expression
public void updateAggregate(Session session) throws java.sql.SQLException
Expression
updateAggregate
in class Expression
session
- the session
java.sql.SQLException
public boolean isEverything(ExpressionVisitor visitor)
Expression
isEverything
in class Expression
visitor
- the visitor
public Query getQuery()
public int getCost()
Expression
getCost
in class Expression
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