GreatSQL用户手册

§ Oracle兼容-存储过程-REF CURSOR, SYS_REFCURSOR

§ 1. 语法

1. var SYS_REFCURSOR

2. TYPE type_name IS REF CURSOR

3. OPEN cursor_name FOR {select_statement | dynamic_string}

4. FOR rows IN
   { 
     ( select_statement )
   }
   LOOP statement... END LOOP [label] ;

5. CREATE [OR REPLACE] sp_name(var_list) RETURN SYS_REFCURSOR AS routine_body

6. CREATE [OR REPLACE] sp_name(var_list) AS routine_body

7. cursor1 := cursor2

8. SELECT cursor1 INTO cursor2
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§ 2. 定义和用法

在 ORACLE 模式下，GreatSQL存储过程/存储函数支持以下几种 REF CURSOR, SYS_REFCURSOR 用法：

    1. 语法1：支持用 var SYS_REFCURSOR 语法来定义 SYS_REFCURSOR。
var SYS_REFCURSOR
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    1. 语法2：支持用 TYPE ... IS REF CURSOR 语法定义 REF CURSOR。
TYPE type_name IS REF CURSOR
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    1. 语法3：支持用 OPEN ... FOR 打开 REF CURSOR。
OPEN cursor_name FOR {select_statement | dynamic_string}
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    1. 语法4：FOR rows IN (select_stmt) LOOP 会隐式创建 REF CURSOR，这里的 rows 不需要提前定义，且只在当前 FOR ... LOOP 语句块中有效。
FOR rows IN
{ 
  ( select_statement )
}
LOOP statement... END LOOP [label] ;
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更多关于 FOR rows IN CURSOR 用法参考：Oracle兼容-存储过程-游标（CURSOR）。

    1. 语法5：FUNCTION RETURN SYS_REFCURSOR 支持函数返回 REF CURSOR 类型数据。对于 FUNCTION 不支持变量中包含 SYS_REFCURSOR 类型参数。
CREATE [OR REPLACE] FUNCTION sp_name(var_list) RETURN SYS_REFCURSOR AS routine_body
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    1. 语法6：支持存储过程的参数带 OUT SYS_REFCURSOR，并支持 REF CURSOR 类型返回结果。
CREATE [OR REPLACE] sp_name(var_list) AS routine_body
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    1. 语法7：支持将 REF CURSOR 作为参数来赋值，二者享有共同的 REF CURSOR 状态。cursor1 和 cursor2 都是 REF CURSOR 类型，享有共同的 REF CURSOR 状态。如果其中一个重新 OPEN CURSOR FOR 或者 CLOSE CURSOR，那么会影响所有关联 REF CURSOR。如果只是其中一个被赋值，那么不会影响另外的关联 REF CURSOR，只会影响其他被赋值的 REF CURSOR（详见下方示例12）。
cursor1 := cursor2
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    1. 语法8：采用 SELECT cursor1 INTO cursor2 语法就可以进行 REF CURSOR 赋值，二者享有共同的 REF CURSOR 状态。
SELECT cursor1 INTO cursor2
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§ 3. Oracle兼容说明

在 ORACLE 模式下，GreatSQL存储过程/存储函数中 REF CURSOR, SYS_REFCURSOR 用法与Oracle用法基本一致。

GreatSQL在兼容性差异主要有以下几点：

  1. 只支持在存储过程/存储函数内部中使用 SYS_REFCURSOR，也支持作为参数传入和输出。

  2. REF CURSOR 和 SYS_REFCURSOR 的参数也作为存储过程/存储函数的参数，因此不能再定义同名参数。

  3. 如果只定义了 REF CURSOR 或 SYS_REFCURSOR 而没有定义具体SQL语句，则这个游标无法使用。

  4. 语句 OPEN sp_name FOR 可以用在 LOOP .. END LOOP 语句块里。

  5. 支持在 OPEN sp_name FOR 之后无需先 CLOSE 而可以继续 OPEN sp_name FOR 再次使用，这点和 OPEN sp_name 用法不一样。

  6. 游标 cur1 没有定义的话，cur1%ISOPEN 依然可以被使用而不会报错；而 cur1%FOUND, cur1%NOTFOUND, cur1%ROWCOUNT 则会报错。

  7. 对于 CALL sp1(IN var_name) 中的参数 var_name 只能执行 FETCH 和 CLOSE 操作，不能进行赋值和 OPEN FOR 操作，这点与Oracle行为一致。

  8. 对于 CALL sp1(var_name) 中的 var_name 必须为REF CURSOR类型，否则会报错（详见下方示例11）。

  9. 如果被关联的游标关闭以后，在Oracle中该游标是不能再被打开只能被赋值使用；但在GreatSQL允许再次被打开使用，也可以再被赋值使用，这点二者不一样（详见下方示例13）。

  10. 在ORACLE模式下，SELECT 结果为 SYS_REFCURSOR 的存储函数结果的输出为 NULL (详见下方示例10)。

§ 4. 示例

修改 sql_generate_invisible_primary_key 选项设定，因为下面案例中创建的表没有显式主键，关闭该选项可以避免自动创建隐式主键 my_row_id，可能会对下面的案例造成影响。

greatsql> SET SESSION sql_generate_invisible_primary_key = 0;
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创建测试表并初始化数据

greatsql> CREATE TABLE t1 (a INT NOT NULL, b VARCHAR(20) NOT NULL);
greatsql> INSERT INTO t1 VALUES(1, 'row1'), (2, 'row2'), (3,'row3') ;
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    1. 示例1：SYS_REFCURSOR, OPEN CURSOR
greatsql> SET sql_mode = ORACLE;
greatsql> DELIMITER //

greatsql> CREATE OR REPLACE PROCEDURE p1() AS
  cur1 SYS_REFCURSOR;
  sql1 VARCHAR(100);
  rtype t1%ROWTYPE;
BEGIN
  sql1 := 'SELECT * FROM t1';

  OPEN cur1 FOR sql1;

  LOOP
    FETCH cur1 INTO rtype;
  EXIT WHEN cur1%NOTFOUND;

  SELECT rtype.a, rtype.b;
  END LOOP;
END; //

greatsql> CALL p1() //
+---------+---------+
| rtype.a | rtype.b |
+---------+---------+
|       1 | row1    |
+---------+---------+
1 row in set (0.00 sec)

+---------+---------+
| rtype.a | rtype.b |
+---------+---------+
|       2 | row2    |
+---------+---------+
1 row in set (0.00 sec)

+---------+---------+
| rtype.a | rtype.b |
+---------+---------+
|       3 | row3    |
+---------+---------+
1 row in set (0.00 sec)

Query OK, 0 rows affected (0.00 sec)
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    1. 示例2：SYS_REFCURSOR, OPEN CURSOR FOR
greatsql> SET sql_mode = ORACLE;
greatsql> DELIMITER //

greatsql> CREATE OR REPLACE PROCEDURE p1() AS
  cur1 SYS_REFCURSOR;
  rtype t1%ROWTYPE;
BEGIN
  OPEN cur1 FOR SELECT * FROM t1;

  LOOP
    FETCH cur1 INTO rtype;
  EXIT WHEN cur1%NOTFOUND;

  SELECT rtype.a, rtype.b;
  END LOOP;
END; //

greatsql> CALL p1() //
+---------+---------+
| rtype.a | rtype.b |
+---------+---------+
|       1 | row1    |
+---------+---------+
1 row in set (0.00 sec)

+---------+---------+
| rtype.a | rtype.b |
+---------+---------+
|       2 | row2    |
+---------+---------+
1 row in set (0.00 sec)

+---------+---------+
| rtype.a | rtype.b |
+---------+---------+
|       3 | row3    |
+---------+---------+
1 row in set (0.00 sec)

Query OK, 0 rows affected (0.00 sec)
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    1. 示例3：FOR ident in (SELECT_stmt) LOOP
greatsql> SET sql_mode = ORACLE;
greatsql> DELIMITER //

CREATE OR REPLACE PROCEDURE p1() AS
BEGIN
  --这里的rtype只在当前FOR LOOP内部使用，外面无法使用
  FOR rtype in (SELECT * FROM t1) LOOP
    SELECT rtype.a, rtype.b;
  END LOOP;
END; //

greatsql> CALL p1() //
+-----------+-----------+
| rtype.a | rtype.b |
+-----------+-----------+
|         1 | aa        |
+-----------+-----------+
1 row in set (0.02 sec)

+-----------+-----------+
| rtype.a | rtype.b |
+-----------+-----------+
|         2 | bb        |
+-----------+-----------+
1 row in set (0.02 sec)

+-----------+-----------+
| rtype.a | rtype.b |
+-----------+-----------+
|         3 | cc        |
+-----------+-----------+
1 row in set (0.02 sec)

Query OK, 0 rows affected (0.02 sec)
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    1. 示例4：REF CURSOR
greatsql> SET sql_mode = ORACLE;
greatsql> DELIMITER //

CREATE OR REPLACE PROCEDURE p1() AS
  TYPE dr_CURSOR IS REF CURSOR;
  cur1 dr_CURSOR;
  rtype t1%ROWTYPE;
BEGIN
  -- 这里可以改写成sql1 := 'SELECT * FROM t1 WHERE a<3';
  -- OPEN cur1 FOR sql1;sql1需要提前声明。
  OPEN cur1 FOR SELECT * FROM t1 WHERE a<3;

  LOOP
    FETCH cur1 INTO rtype;
  EXIT WHEN cur1%NOTFOUND;

  SELECT rtype.a, rtype.b;
  END LOOP;
END; //

greatsql> CALL p1() //
+-----------+-----------+
| rtype.a | rtype.b |
+-----------+-----------+
|         1 | aa        |
+-----------+-----------+
1 row in set (0.01 sec)

+-----------+-----------+
| rtype.a | rtype.b |
+-----------+-----------+
|         2 | bb        |
+-----------+-----------+
1 row in set (0.01 sec)

Query OK, 0 rows affected (0.01 sec)
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    1. 示例5：duplicate var with declared and FOR LOOP
greatsql> SET sql_mode = ORACLE;
greatsql> DELIMITER //

use db1;
set sql_mode="oracle";
CREATE TABLE t1 (a INT, b VARCHAR(3));
INSERT INTO t1 VALUES(1,'aa'),(2,'bb'),(3,'cc') ;
DELIMITER //
CREATE OR REPLACE PROCEDURE p1() AS
  rtype int;
BEGIN
  FOR rtype in (SELECT * FROM t1) LOOP
    SELECT rtype.a, rtype.b;
  END LOOP;
 SELECT rtype;
END; //

> CALL p1() //
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    1. 示例6：FUNCTION RETURN SYS_REFCURSOR
greatsql> SET sql_mode = ORACLE;
greatsql> SET udt_format_result = 'DBA';
greatsql> DELIMITER //

greatsql> CREATE OR REPLACE FUNCTION returnaCURSOR RETURN SYS_REFCURSOR
AS
  cur1 SYS_REFCURSOR;
BEGIN
  OPEN cur1 FOR SELECT * FROM t1 WHERE a < 3;

  RETURN cur1;
END; //

greatsql> CREATE OR REPLACE PROCEDURE p1() AS
  a INT;
  b VARCHAR(20);
  c SYS_REFCURSOR;
BEGIN
  c := returnaCURSOR();

  LOOP
    FETCH c INTO a, b;
    EXIT WHEN c%NOTFOUND;
    SELECT a, b;
  END LOOP;

  CLOSE c;
END; //

greatsql> CALL p1() //
+------+------+
| a    | b    |
+------+------+
|    1 | row1 |
+------+------+
1 row in set (0.00 sec)

+------+------+
| a    | b    |
+------+------+
|    2 | row2 |
+------+------+
1 row in set (0.00 sec)

Query OK, 0 rows affected (0.00 sec)
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    1. 示例7：PROCEDURE WITH OUT SYS_REFCURSOR
greatsql> SET sql_mode = ORACLE;
greatsql> SET udt_format_result = 'DBA';
greatsql> DELIMITER //

greatsql> CREATE OR REPLACE PROCEDURE sp_return(ref_rs OUT SYS_REFCURSOR)
IS
  sql1 VARCHAR(100);
BEGIN
  sql1 := 'SELECT a, b FROM t1 WHERE a > 2';
  OPEN ref_rs FOR sql1;
END; //

greatsql> CREATE OR REPLACE PROCEDURE p1() AS
  a INT;
  b VARCHAR(20);
  c SYS_REFCURSOR;
BEGIN
  CALL sp_return(c);

  LOOP
    FETCH c INTO a, b;
    EXIT WHEN c%NOTFOUND;
    SELECT a, b;
  END LOOP;

  CLOSE c;
END; //

greatsql> CALL p1() //
+------+------+
| a    | b    |
+------+------+
|    3 | row3 |
+------+------+
1 row in set (0.00 sec)

Query OK, 0 rows affected (0.00 sec)
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    1. 示例8：SET REF CURSOR
greatsql> SET sql_mode = ORACLE;
greatsql> SET udt_format_result = 'DBA';
greatsql> DELIMITER //

greatsql> CREATE OR REPLACE FUNCTION return_cur RETURN SYS_REFCURSOR
AS
  cur1 SYS_REFCURSOR;
BEGIN
  OPEN cur1 FOR SELECT * FROM t1 WHERE a < 3;

  RETURN cur1;
END; //

greatsql> CREATE OR REPLACE PROCEDURE p1() AS
  cur1 SYS_REFCURSOR;
  cur2 SYS_REFCURSOR;
  a INT;
  b VARCHAR(20);
BEGIN
  cur1 := return_cur();
  cur2 := cur1;

  LOOP
    FETCH cur2 INTO a, b;
    EXIT WHEN cur2%NOTFOUND;
    SELECT a, b;
  END LOOP;
  CLOSE cur2;
END; //

greatsql> CALL p1() //
+------+------+
| a    | b    |
+------+------+
|    1 | row1 |
+------+------+
1 row in set (0.00 sec)

+------+------+
| a    | b    |
+------+------+
|    2 | row2 |
+------+------+
1 row in set (0.00 sec)

Query OK, 0 rows affected (0.00 sec)
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    1. 示例9：SELECT REF CURSOR INTO REF CURSOR
greatsql> SET sql_mode = ORACLE;
greatsql> SET udt_format_result = 'DBA';
greatsql> DELIMITER //

greatsql> CREATE OR REPLACE FUNCTION return_cur RETURN SYS_REFCURSOR
AS
  cur1 SYS_REFCURSOR;
BEGIN
  OPEN cur1 FOR SELECT * FROM t1 WHERE a < 3;

  RETURN cur1;
END; //

greatsql> CREATE OR REPLACE PROCEDURE p1() AS
  cur1 SYS_REFCURSOR;
  cur2 SYS_REFCURSOR;
  a INT;
  b VARCHAR(20);
BEGIN
  cur1 := return_cur();
  SELECT cur1 INTO cur2;
  LOOP
    FETCH cur2 INTO a, b;
    EXIT WHEN cur2%NOTFOUND;
    SELECT a, b;
  END LOOP;
  CLOSE cur2;
END; //

greatsql> CALL p1() //
+------+------+
| a    | b    |
+------+------+
|    1 | row1 |
+------+------+
1 row in set (0.00 sec)

+------+------+
| a    | b    |
+------+------+
|    2 | row2 |
+------+------+
1 row in set (0.00 sec)

Query OK, 0 rows affected (0.00 sec)
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    1. 示例10：SELECT SYS_REFCURSOR FUNCTION
greatsql> SET sql_mode = ORACLE;
greatsql> SET udt_format_result = 'DBA';
greatsql> DELIMITER //

greatsql> CREATE OR REPLACE FUNCTION return_cur RETURN SYS_REFCURSOR
AS
  cur1 SYS_REFCURSOR;
BEGIN
  OPEN cur1 FOR SELECT 1, 'row1';

  RETURN cur1;
END; //

greatsql> CREATE OR REPLACE PROCEDURE p1() AS
  type dr_CURSOR IS REF CURSOR;
  cur1 dr_CURSOR;
BEGIN
  SELECT return_cur() FROM t1;
END; //

greatsql> CALL p1() //
ERROR 1235 (42000): This version of MySQL doesn't yet support 'REF CURSOR used in table'
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    1. 示例11：参数返回
greatsql> SET sql_mode = ORACLE;
greatsql> SET udt_format_result = 'DBA';
greatsql> DELIMITER //

greatsql> CREATE OR REPLACE PROCEDURE sp_return(ref_rs OUT SYS_REFCURSOR) IS
 sql1 VARCHAR(100);
BEGIN
  sql1  := 'SELECT a, b FROM t1 WHERE a > 2';
  OPEN ref_rs FOR sql1;
END; //

greatsql> CREATE OR REPLACE PROCEDURE p1() AS
  a INT;
BEGIN
  CALL sp_return(a);
END; //

greatsql> CALL p1() //
ERROR 7553 (HY000): inconsistent datatypes: udt type and non udt type
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    1. 示例12：OPEN FOR 和 CLOSE 以及赋值对其他 REF CURSOR 的影响
greatsql> SET sql_mode = ORACLE;
greatsql> SET udt_format_result = 'DBA';
greatsql> DELIMITER //

-- 1、OPEN FOR的影响范围
greatsql> CREATE OR REPLACE FUNCTION return_cur RETURN SYS_REFCURSOR
AS
  cur1 SYS_REFCURSOR;
BEGIN
  OPEN cur1 FOR SELECT * FROM t1 WHERE a < 3;

  RETURN cur1;
END; //

greatsql> CREATE OR REPLACE PROCEDURE p1() IS
  v_a INT;
  v_b VARCHAR(30);
  cur1 SYS_REFCURSOR;
  cur2 SYS_REFCURSOR;
BEGIN
  cur1 := return_cur();
  SELECT cur1 INTO cur2 FROM DUAL;

  OPEN cur2 FOR SELECT * FROM t1 WHERE a = 1;
  LOOP
    FETCH cur1 INTO v_a, v_b;
    EXIT WHEN cur1%NOTFOUND;
    SELECT v_a, v_b;
  END LOOP;
  CLOSE cur2;
END; //

-- OPEN FOR以后影响了所有关联过的REF CURSOR
greatsql> CALL p1() //
+------+------+
| v_a  | v_b  |
+------+------+
|    1 | row1 |
+------+------+
1 row in set (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

-- 2、CLOSE的影响范围
-- 略过FUNCTION return_cur()的创建过程，复用上例结果
greatsql> CREATE OR REPLACE PROCEDURE p1() IS
  a INT;
  b VARCHAR(30);
  cur1 SYS_REFCURSOR;
  cur2 SYS_REFCURSOR;
BEGIN
  cur1 := return_cur();
  SELECT cur1 INTO cur2 FROM DUAL;
  CLOSE cur2;   -- 在打开游标cur1之前关闭cur2，则cur1受到影响，如果放在FETCH cur1之后就可以
  FETCH cur1 INTO a, b;
END; //

-- CLOSE以后影响了所有关联REF CURSOR
greatsql> CALL p1() //
ERROR 1324 (42000): Undefined CURSOR: cur1

-- 3、单纯set的影响范围
CREATE OR REPLACE FUNCTION return_cur1 RETURN SYS_REFCURSOR
AS
  cur1 SYS_REFCURSOR;
BEGIN
  OPEN cur1 FOR SELECT * FROM t1 WHERE a = 2;

  RETURN cur1;
END; //

CREATE OR REPLACE PROCEDURE p1() IS
  v_a INT;
  v_b VARCHAR(30);
  cur1 SYS_REFCURSOR;
  cur2 SYS_REFCURSOR;
  cur3 SYS_REFCURSOR;
BEGIN
  cur1 := return_cur();

  SELECT cur1 INTO cur2 FROM DUAL;
  cur3 := cur2;
  cur1 := return_cur1();

  LOOP
    FETCH cur3 INTO v_a, v_b;
    EXIT WHEN cur3%NOTFOUND;

    SELECT v_a, v_b;
  END LOOP;

  LOOP
    FETCH cur1 INTO v_a, v_b;
    EXIT WHEN cur1%NOTFOUND;
    SELECT v_a, v_b;
  END LOOP;
END; //

-- 从结果可以看到，最初的cur1被改变后，只影响了自己，没有影响被它赋值的cur2和cur3
greatsql> CALL p1() //
+------+------+
| v_a  | v_b  |
+------+------+
|    1 | row1 |
+------+------+
1 row in set (0.00 sec)

+------+------+
| v_a  | v_b  |
+------+------+
|    2 | row2 |
+------+------+
1 row in set (0.00 sec)

+------+------+
| v_a  | v_b  |
+------+------+
|    2 | row2 |
+------+------+
1 row in set (0.00 sec)

Query OK, 0 rows affected (0.00 sec)
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    1. 示例13：CLOSE REF CURSOR 对关联游标的影响
greatsql> SET sql_mode = ORACLE;
greatsql> SET udt_format_result = 'DBA';
greatsql> DELIMITER //

greatsql> CREATE OR REPLACE FUNCTION return_cur RETURN SYS_REFCURSOR
AS
  cur1 SYS_REFCURSOR;
BEGIN
  OPEN cur1 FOR SELECT * FROM t1 WHERE a < 3;

  RETURN cur1;
END; //

greatsql> CREATE OR REPLACE PROCEDURE p1() IS
  v_a INT;
  v_b VARCHAR(30);
  cur1 SYS_REFCURSOR;
  cur2 SYS_REFCURSOR;
BEGIN
  cur1 := return_cur();
  SELECT cur1 INTO cur2 FROM DUAL;
  CLOSE cur2;

  -- 在GreatSQL中这里再次被OPEN是允许的，但在Oracle中会报告invalid CURSOR错误
  OPEN cur1 FOR SELECT * FROM t1 WHERE a = 1;
  LOOP
    FETCH cur1 INTO v_a, v_b;
    EXIT WHEN cur1%NOTFOUND;
    SELECT v_a, v_b;
  END LOOP;
END; //

greatsql> CALL p1() //
+------+------+
| v_a  | v_b  |
+------+------+
|    1 | row1 |
+------+------+
1 row in set (0.00 sec)

Query OK, 0 rows affected (0.00 sec)
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    1. 示例14：in SYS_REFCURSOR
greatsql> SET sql_mode = ORACLE;
greatsql> SET udt_format_result = 'DBA';
greatsql> DELIMITER //

greatsql> CREATE OR REPLACE PROCEDURE sp_return(ref_rs in SYS_REFCURSOR) IS
  sql1 VARCHAR(100);
  v_a INT;
  v_b VARCHAR(30);
  BEGIN
  FETCH ref_rs INTO v_a, v_b;
  SELECT v_a, v_b;
 END //

greatsql> CREATE OR REPLACE PROCEDURE p1() AS
  cur1 SYS_REFCURSOR;
  cur2 SYS_REFCURSOR;
  v_a INT;
  v_b VARCHAR(20);
BEGIN
  OPEN cur1 FOR SELECT * FROM t1;
  CALL sp_return(cur1);

  SELECT 'AFTER CALL sp_return';

  LOOP
    FETCH cur1 INTO v_a, v_b;
    EXIT WHEN cur1%NOTFOUND;
    SELECT v_a, v_b;
  END LOOP;

  CLOSE cur1;
END //

greatsql> CALL p1() //
+------+------+
| v_a  | v_b  |
+------+------+
|    1 | row1 |
+------+------+
1 row in set (0.00 sec)

+----------------------+
| AFTER CALL sp_return |
+----------------------+
| AFTER CALL sp_return |
+----------------------+
1 row in set (0.00 sec)

+------+------+
| v_a  | v_b  |
+------+------+
|    2 | row2 |
+------+------+
1 row in set (0.00 sec)

+------+------+
| v_a  | v_b  |
+------+------+
|    3 | row3 |
+------+------+
1 row in set (0.00 sec)

Query OK, 0 rows affected (0.00 sec)
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