Class ArraySizeMethod
- java.lang.Object
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- org.datanucleus.store.rdbms.sql.method.ArraySizeMethod
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- All Implemented Interfaces:
SQLMethod
public class ArraySizeMethod extends java.lang.Object implements SQLMethod
Method for evaluating {arrExpr1}.size(). Returns a NumericExpression. Equates to a sub-query on the table for the array returning the COUNT(*) of the number of elements. Something likeSELECT COUNT(*) FROM ARRTABLE A0_SUB WHERE A0_SUB.OWNER_ID_OID = A0.OWNER_ID
where A0 is the candidate table in the outer query, and ARRTABLE is the join table (if using join collection) or the element table (if using FK array).
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Constructor Summary
Constructors Constructor Description ArraySizeMethod()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description SQLExpression
getExpression(SQLStatement stmt, SQLExpression expr, java.util.List<SQLExpression> args)
Return the expression for this SQL function.
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Method Detail
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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 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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