如何从函数返回表格？

Question

我正在使用Oracle 12c和Oracle SQL Developer创建一个包。我的意图是将一个值从SQL语句传递给包，如SELECT * FROM table(test2.get_ups(0));。我想返回一个表，如在IDE中执行SQL SELECT语句。

这是我的包装。当我尝试编译我收到以下错误：

PLS-00103: Encountered the symbol "FOR" when expecting one of the following: begin function pragma procedure subtype type <an identifier> <a double-quoted delimited-identifier> current cursor delete exists prior The symbol "begin" was substituted for "FOR" to continue.

我该如何解决这个问题？

这里是包：

CREATE OR REPLACE PACKAGE test2 AS 

    TYPE measure_record IS RECORD(
     x_start VARCHAR2(50), 
     x_end VARCHAR2(50), 
     trip_count NUMBER); 

    TYPE measure_table IS TABLE OF measure_record; 

    FUNCTION get_ups(x number) 
     RETURN measure_table 
     PIPELINED; 
END; 
/
CREATE OR REPLACE PACKAGE BODY test2 AS 

    FUNCTION get_ups(x number) RETURN measure_table 
     PIPELINED as 

     cursor temp_cur is 
      SELECT x1, x2, count(*) FROM t1 WHERE x1 = x; 

      for cur_rec in temp_cur 
      loop 
       pipe row(cur_rec); 
      end loop; 

     RETURN; 
    END get_ups; 
END; 

Answer 1

我想你会要么将光标移动到DECLARE部分或使用匿名光标，像这样：

FOR cur_rec IN (SELECT x1, x2, count(*) FROM t1 WHERE x1 = x) 
LOOP 

Answer 2

有几个问题：函数定义需要一个BEGIN。此函数必须返回变量的实例而不是游标，并且该查询需要GROUP BY。

以下每一项更改都有一条评论。

create table t1(x1 number, x2 number); 

CREATE OR REPLACE PACKAGE test2 AS 

    TYPE measure_record IS RECORD(
     x_start VARCHAR2(50), 
     x_end VARCHAR2(50), 
     trip_count NUMBER); 

    TYPE measure_table IS TABLE OF measure_record; 

    FUNCTION get_ups(x number) 
     RETURN measure_table 
     PIPELINED; 
END; 
/
CREATE OR REPLACE PACKAGE BODY test2 AS 

    FUNCTION get_ups(x number) RETURN measure_table 
     PIPELINED as 

     temp measure_record; --Add temporary variable to hold the cursor values. 

     cursor temp_cur is 
      SELECT x1, x2, count(*) FROM t1 WHERE x1 = x GROUP BY x1, x2; --Add "GROUP BY". 
    BEGIN --Add "BEGIN". 
      for cur_rec in temp_cur 
      loop 
       --Assign the values to the temporary variable. 
       temp.x_start := cur_rec.x1; 
       temp.x_end := cur_rec.x2; 
       temp.trip_count := cur_rec."COUNT(*)"; 
       pipe row(temp); --Pipe the variable, not the cursor. 
      end loop; 

     RETURN; 
    END get_ups; 
END; 
/

select * from table(test2.get_ups(1));