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java.lang.Objectorg.h2.expression.Expression
org.h2.expression.ValueExpression
public class ValueExpression
An expression representing a constant value.
| Method Summary | |
|---|---|
void |
createIndexConditions(Session session,
TableFilter filter)
Create index conditions if possible and attach them to the table filter. |
static ValueExpression |
get(Value value)
Create a new expression with the given value. |
int |
getCost()
Estimate the cost to process the expression. |
static ValueExpression |
getDefault()
Get the DEFAULT expression. |
int |
getDisplaySize()
Get the display size of this expression. |
Expression[] |
getExpressionColumns(Session session)
If this expression consists of column expressions it should return them. |
Expression |
getNotIfPossible(Session session)
If it is possible, return the negated expression. |
static ValueExpression |
getNull()
Get the NULL expression. |
long |
getPrecision()
Get the precision of this expression. |
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 |
isConstant()
Check if this expression will always return the same value. |
boolean |
isEverything(ExpressionVisitor visitor)
Check if this expression and all sub-expressions can fulfill a criteria. |
boolean |
isValueSet()
Is the value of a parameter set. |
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 |
|---|
addFilterConditions, getAlias, getBooleanValue, getColumnName, getExpressionColumns, getNonAliasExpression, getNullable, getSchemaName, getTableAlias, getTableName, isAutoIncrement, isWildcard, toString |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
| Method Detail |
|---|
public static ValueExpression getNull()
public static ValueExpression getDefault()
public static ValueExpression get(Value value)
value - the value
public Value getValue(Session session)
Expression
getValue in class Expressionsession - the session
public int getType()
Expression
getType in class Expression
public void createIndexConditions(Session session,
TableFilter filter)
Expression
createIndexConditions in class Expressionsession - the sessionfilter - the table filterpublic Expression getNotIfPossible(Session session)
Expression
getNotIfPossible in class Expressionsession - the session
public void mapColumns(ColumnResolver resolver,
int level)
Expression
mapColumns in class Expressionresolver - the column resolverlevel - the subquery nesting levelpublic Expression optimize(Session session)
Expression
optimize in class Expressionsession - the session
public boolean isConstant()
Expression
isConstant in class Expressionpublic boolean isValueSet()
Expression
isValueSet in class Expression
public void setEvaluatable(TableFilter tableFilter,
boolean b)
Expression
setEvaluatable in class ExpressiontableFilter - the table filterb - true if the table filter can return valuepublic int getScale()
Expression
getScale in class Expressionpublic long getPrecision()
Expression
getPrecision in class Expressionpublic int getDisplaySize()
Expression
getDisplaySize in class Expressionpublic java.lang.String getSQL()
Expression
getSQL in class Expressionpublic void updateAggregate(Session session)
Expression
updateAggregate in class Expressionsession - the sessionpublic boolean isEverything(ExpressionVisitor visitor)
Expression
isEverything in class Expressionvisitor - the visitor
public int getCost()
Expression
getCost in class Expressionpublic Expression[] getExpressionColumns(Session session)
Expression
getExpressionColumns in class Expressionsession - the session
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