Class MapValueMethod

java.lang.Object
org.datanucleus.store.rdbms.sql.method.MapValueMethod
All Implemented Interfaces:
SQLMethod
public class MapValueMethod extends Object implements SQLMethod
Method for evaluating VALUE({mapExpr}). Returns an ObjectExpression representing the value mapping.

  • Constructor Details

    • MapValueMethod

      public MapValueMethod()

  • Method Details

    • 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

    • getAsJoin

      protected SQLExpression getAsJoin(SQLStatement parentStmt, MapExpression mapExpr)
      Implementation of VALUE(map) using a join to the table representing the map, and returning the value.
      Parameters:
      parentStmt - The parent SQL statement
      mapExpr - The map expression
      Returns:
      The value expression

    • getAsSubquery

      protected SQLExpression getAsSubquery(SQLStatement stmt, MapExpression mapExpr)
      Implementation of VALUE(map) using a subquery on the table representing the map, returning the value.
      Parameters:
      stmt - SQLStatement
      mapExpr - The map expression
      Returns:
      The value expression