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java.lang.Objectcom.caucho.db.sql.Expr
com.caucho.db.sql.FunExpr
com.caucho.db.sql.SumExpr
public class SumExpr
Field Summary | |
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protected static L10N |
L
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Fields inherited from class com.caucho.db.sql.Expr |
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FALSE, TRUE, UNKNOWN |
Constructor Summary | |
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SumExpr()
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Method Summary | |
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protected void |
addArg(Expr expr)
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Expr |
bind(Query query)
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double |
evalDouble(QueryContext context)
Evaluates the expression as a double. |
void |
evalGroup(QueryContext context)
Evaluates aggregate functions during the group phase. |
long |
evalLong(QueryContext context)
Evaluates the expression as a long. |
java.lang.String |
evalString(QueryContext context)
Evaluates the expression as a string. |
java.lang.Class<?> |
getType()
Returns the expected result type of the expression. |
void |
initGroup(QueryContext context)
Initializes aggregate functions during the group phase. |
boolean |
isNull(QueryContext context)
Returns true for a null value. |
Methods inherited from class com.caucho.db.sql.Expr |
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cost, createOrder, evalBoolean, evalBytes, evalDate, evalEqual, evalEqual, evalStream, evalToBuffer, evalToBuffer, evalToResult, getIndexExpr, getName, getSQLType, getTable, getTypeCode, indexCost, indexSubCost, isBinaryStream, isBoolean, isDouble, isLong, isNullable, isParam, isSelect, splitAnd, subCost, updateDouble, updateLong, updateString |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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protected static final L10N L
Constructor Detail |
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public SumExpr()
Method Detail |
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protected void addArg(Expr expr) throws java.sql.SQLException
addArg
in class FunExpr
java.sql.SQLException
public Expr bind(Query query) throws java.sql.SQLException
bind
in class Expr
java.sql.SQLException
public java.lang.Class<?> getType()
Expr
getType
in class Expr
public void initGroup(QueryContext context) throws java.sql.SQLException
initGroup
in class Expr
context
- the current database tuple
java.sql.SQLException
public void evalGroup(QueryContext context) throws java.sql.SQLException
evalGroup
in class Expr
context
- the current database tuple
java.sql.SQLException
public boolean isNull(QueryContext context) throws java.sql.SQLException
isNull
in class Expr
rows
- the current tuple being evaluated
java.sql.SQLException
public double evalDouble(QueryContext context) throws java.sql.SQLException
evalDouble
in class Expr
rows
- the current tuple being evaluated
java.sql.SQLException
public long evalLong(QueryContext context) throws java.sql.SQLException
evalLong
in class Expr
rows
- the current tuple being evaluated
java.sql.SQLException
public java.lang.String evalString(QueryContext context) throws java.sql.SQLException
evalString
in class Expr
rows
- the current tuple being evaluated
java.sql.SQLException
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