Question

我想创建一个选择和更改数据的函数

CREATE OR REPLACE FUNCTION PublicatedTask( argument ) RETURNS SETOF task AS $$DECLARE
   f task%ROWTYPE;   
  BEGIN
    FOR f IN SELECT * FROM Task where layer IN $1 and publicationin<>0 ORDER BY id LOOP
      if (f.publicationIN = 1) then
    f.description='';
    end if;    
    RETURN NEXT f; 
    END LOOP;
    RETURN;
  END;
  $$
 LANGUAGE 'plpgsql';

但我不知道什么参数类型？

我想SELECT * FROM PublicatedTask((1,2,3));

感谢您的帮助

Answer 1

或使用VARIADIC：

CREATE OR REPLACE FUNCTION PublicatedTask( VARIADIC argument int[]) RETURNS SETOF task AS $$DECLARE
   f task%ROWTYPE;   
  BEGIN
    FOR f IN SELECT * FROM Task where layer = ANY($1) and publicationin<>0 ORDER BY id LOOP
      if (f.publicationIN = 1) then
    f.description='';
    end if;    
    RETURN NEXT f; 
    END LOOP;
    RETURN;
  END;
  $$
 LANGUAGE 'plpgsql';

并以这种方式使用它：

SELECT * FROM PublicatedTask(1,2,3);

从版本8.4开始，

VARIADIC可用：http://www.postgresql.org/docs/8.4/interactive/xfunc-sql.html#XFUNC-SQL-VARIADIC-FUNCTIONS

Answer 2

您可以使用整数数组作为参数：

CREATE OR REPLACE FUNCTION PublicatedTask( argument int[]) RETURNS SETOF task AS $$DECLARE
   f task%ROWTYPE;   
  BEGIN
    FOR f IN SELECT * FROM Task where layer = ANY($1) and publicationin<>0 ORDER BY id LOOP
      if (f.publicationIN = 1) then
    f.description='';
    end if;    
    RETURN NEXT f; 
    END LOOP;
    RETURN;
  END;
  $$
 LANGUAGE 'plpgsql';

然后你可以这样称呼它：

SELECT * FROM PublicatedTask('{1,2,3}');

使用参数作为子选择创建函数

2 个答案: