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java.lang.Objectorg.h2.expression.Expression
org.h2.expression.Wildcard
public class Wildcard
A wildcard expression as in SELECT * FROM TEST. This object is only used temporarily during the parsing phase, and later replaced by column expressions.
| Constructor Summary | |
|---|---|
Wildcard(java.lang.String schema,
java.lang.String table)
|
|
| Method Summary | |
|---|---|
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. |
int |
getScale()
Get the scale of this expression. |
java.lang.String |
getSchemaName()
Get the schema name, or null |
java.lang.String |
getSQL()
Get the SQL statement of this expression. |
java.lang.String |
getTableAlias()
Get the table alias name or null if this expression does not represent a column. |
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. |
boolean |
isWildcard()
Only returns true if the expression is a wildcard. |
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, createIndexConditions, getAlias, getBooleanValue, getColumnName, getExpressionColumns, getExpressionColumns, getNonAliasExpression, getNotIfPossible, getNullable, getTableName, isAutoIncrement, isConstant, isValueSet, toString |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
| Constructor Detail |
|---|
public Wildcard(java.lang.String schema,
java.lang.String table)
| Method Detail |
|---|
public boolean isWildcard()
Expression
isWildcard in class Expressionpublic Value getValue(Session session)
Expression
getValue in class Expressionsession - the session
public int getType()
Expression
getType in class Expression
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 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 getTableAlias()
Expression
getTableAlias in class Expressionpublic java.lang.String getSchemaName()
Expression
getSchemaName 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 Expression
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