com.caucho.db.sql
Class ExistsExpr
java.lang.Object
com.caucho.db.sql.Expr
com.caucho.db.sql.SubSelectExpr
com.caucho.db.sql.ExistsExpr
public class ExistsExpr
- extends SubSelectExpr
Field Summary |
protected static L10N |
L
|
Method Summary |
Expr |
bind(Query query)
Binds the expression to the query. |
int |
evalBoolean(QueryContext context)
Evaluates the expression as a string. |
java.lang.Class |
getType()
Returns the expected result type of the expression. |
boolean |
isNull(QueryContext context)
Evaluates the expression to check for null |
long |
subCost(java.util.ArrayList<FromItem> fromList)
Returns the cost based on the given FromList. |
java.lang.String |
toString()
|
Methods inherited from class com.caucho.db.sql.Expr |
cost, createOrder, evalBytes, evalDate, evalDouble, evalEqual, evalEqual, evalGroup, evalLong, evalStream, evalToBuffer, evalToBuffer, evalToResult, getIndexExpr, getName, getSQLType, getTable, getTypeCode, indexCost, indexSubCost, initGroup, isBinaryStream, isBoolean, isDouble, isLong, isNullable, isParam, isSelect, splitAnd, updateDouble, updateLong, updateString |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
L
protected static final L10N L
bind
public Expr bind(Query query)
throws java.sql.SQLException
- Binds the expression to the query.
- Overrides:
bind
in class SubSelectExpr
- Throws:
java.sql.SQLException
getType
public java.lang.Class getType()
- Returns the expected result type of the expression.
- Overrides:
getType
in class SubSelectExpr
subCost
public long subCost(java.util.ArrayList<FromItem> fromList)
- Returns the cost based on the given FromList.
- Overrides:
subCost
in class SubSelectExpr
isNull
public boolean isNull(QueryContext context)
throws java.sql.SQLException
- Evaluates the expression to check for null
- Overrides:
isNull
in class Expr
- Parameters:
rows
- the current database tuple
- Returns:
- the null value
- Throws:
java.sql.SQLException
evalBoolean
public int evalBoolean(QueryContext context)
throws java.sql.SQLException
- Evaluates the expression as a string.
- Overrides:
evalBoolean
in class Expr
- Parameters:
rows
- the current database tuple
- Returns:
- the string value
- Throws:
java.sql.SQLException
toString
public java.lang.String toString()
- Overrides:
toString
in class SubSelectExpr