SimpleNumericAggregateMethod

java.lang.Object
- org.datanucleus.store.rdbms.sql.method.SimpleNumericAggregateMethod

All Implemented Interfaces:

SQLMethod

Direct Known Subclasses:

AvgFunction, SumFunction
```
public abstract class SimpleNumericAggregateMethod
extends java.lang.Object
implements SQLMethod
```
Expression handler to invoke an SQL aggregated function.
- The expression should be null and will return an AggregateExpression
```
{functionName}({argExpr})
```
  when processing a result clause
- If the compilation component is something else then will generate a subquery expression

Constructor Summary

Constructors
Constructor Description

SimpleNumericAggregateMethod()

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`protected abstract java.lang.Class`	`getClassForMapping()`
`SQLExpression`	`getExpression(SQLStatement stmt, SQLExpression expr, java.util.List<SQLExpression> args)`	Return the expression for this SQL function.
`protected abstract java.lang.String`	`getFunctionName()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - SimpleNumericAggregateMethod
```
public SimpleNumericAggregateMethod()
```
- Method Detail
  - getFunctionName
```
protected abstract java.lang.String getFunctionName()
```
  - getExpression
```
public SQLExpression getExpression(SQLStatement stmt,
                                   SQLExpression expr,
                                   java.util.List<SQLExpression> args)
```
    Description copied from interface: SQLMethod
    
    Return the expression for this SQL function.
    
    Specified by:
    
    getExpression in interface SQLMethod
    
    Parameters:
    
    stmt - SQLStatement that this expression is for
    
    expr - The expression that it is invoked on
    
    args - Arguments passed in
    
    Returns:
    
    The SQL expression using the SQL function
  - getClassForMapping
```
protected abstract java.lang.Class getClassForMapping()
```