Class AvgFunction
java.lang.Object
org.datanucleus.store.rdbms.sql.method.SimpleNumericAggregateMethod
org.datanucleus.store.rdbms.sql.method.AvgFunction
- All Implemented Interfaces:
SQLMethod
- Direct Known Subclasses:
AvgWithCastFunction
Expression handler to invoke the SQL AVG aggregation function.
For use in evaluating AVG({expr}) where the RDBMS supports this function.
Returns a NumericExpression "AVG({numericExpr})".
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionprotected SQLExpression
getAggregateExpression
(SQLStatement stmt, List<SQLExpression> args, JavaTypeMapping m) protected Class
getExpression
(SQLStatement stmt, SQLExpression expr, List<SQLExpression> args) Return the expression for this SQL function.protected String
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Constructor Details
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AvgFunction
public AvgFunction()
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Method Details
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getFunctionName
- Specified by:
getFunctionName
in classSimpleNumericAggregateMethod
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getExpression
Description copied from interface:SQLMethod
Return the expression for this SQL function.- Specified by:
getExpression
in interfaceSQLMethod
- Overrides:
getExpression
in classSimpleNumericAggregateMethod
- Parameters:
stmt
- SQLStatement that this expression is forexpr
- The expression that it is invoked onargs
- Arguments passed in- Returns:
- The SQL expression using the SQL function
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getAggregateExpression
protected SQLExpression getAggregateExpression(SQLStatement stmt, List<SQLExpression> args, JavaTypeMapping m) -
getClassForMapping
- Specified by:
getClassForMapping
in classSimpleNumericAggregateMethod
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