ArraySizeMethod (DataNucleus RDBMS plugin 5.2.10 API)

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

All Implemented Interfaces:

SQLMethod
```
public class ArraySizeMethod
extends 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 like
```
 SELECT 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).

Constructor Summary

Constructors
Constructor Description

ArraySizeMethod()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`SQLExpression`	`getExpression(SQLStatement stmt, SQLExpression expr, List<SQLExpression> args)`	Return the expression for this SQL function.

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

- Constructor Detail
  - ArraySizeMethod
```
public ArraySizeMethod()
```
- Method Detail
  - getExpression
```
public SQLExpression getExpression(SQLStatement stmt,
                                   SQLExpression expr,
                                   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