Class SimpleOrderableAggregateMethod
java.lang.Object
org.datanucleus.store.rdbms.sql.method.SimpleOrderableAggregateMethod
- All Implemented Interfaces:
SQLMethod
- Direct Known Subclasses:
MaxFunction
,MinFunction
Expression handler to invoke an SQL aggregated function.
- The expression should be null and will return an AggregateXXXExpression
{functionName}({argExpr})
when processing a result clause - If the compilation component is something else then will generate a subquery expression
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptiongetExpression
(SQLStatement stmt, SQLExpression expr, List<SQLExpression> args) Return the expression for this SQL function.protected abstract String
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Constructor Details
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SimpleOrderableAggregateMethod
public SimpleOrderableAggregateMethod()
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Method Details
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getFunctionName
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getExpression
Description copied from interface:SQLMethod
Return the expression for this SQL function.- Specified by:
getExpression
in interfaceSQLMethod
- 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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