Class ListGetMethod
java.lang.Object
org.datanucleus.store.rdbms.sql.method.ListGetMethod
- All Implemented Interfaces:
SQLMethod
Method for evaluating {listExpr}.get(idxExpr).
Returns an ObjectExpression representing the element
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionprotected SQLExpression
getAsInnerJoin
(SQLStatement stmt, CollectionExpression listExpr, SQLExpression idxExpr) Implementation of List.get() using an inner join to the table representing the list, adding a condition on the index and returning the element.protected SQLExpression
getAsSubquery
(SQLStatement stmt, CollectionExpression listExpr, SQLExpression idxExpr) Implementation of Collection.get() using a subquery on the table representing the collection, adding a condition on the index and returning the element.getExpression
(SQLStatement stmt, SQLExpression expr, List<SQLExpression> args) Return the expression for this SQL function.
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Constructor Details
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ListGetMethod
public ListGetMethod()
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Method Details
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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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getAsSubquery
protected SQLExpression getAsSubquery(SQLStatement stmt, CollectionExpression listExpr, SQLExpression idxExpr) Implementation of Collection.get() using a subquery on the table representing the collection, adding a condition on the index and returning the element.- Parameters:
stmt
- SQLStatementlistExpr
- The list expressionidxExpr
- The index expression- Returns:
- The element expression
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getAsInnerJoin
protected SQLExpression getAsInnerJoin(SQLStatement stmt, CollectionExpression listExpr, SQLExpression idxExpr) Implementation of List.get() using an inner join to the table representing the list, adding a condition on the index and returning the element.- Parameters:
stmt
- SQLStatementlistExpr
- The list expressionidxExpr
- The index expression- Returns:
- The element expression
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