游标支持表名变量的存储过程写法

DELIMITER $$

DROP PROCEDURE IF EXISTS `hcymysql`$$

CREATE DEFINER=`admin`@`%` PROCEDURE `hcymysql`(IN v_tname VARCHAR(20))
BEGIN
DECLARE i INT;
DECLARE done INT DEFAULT 0;
DECLARE hcymysql_cursor CURSOR FOR SELECT id FROM view_tname;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=1;

DROP VIEW IF EXISTS view_tname ;
SET @sql=CONCAT("create view view_tname as select * from ", v_tname);
PREPARE stmt1 FROM  @sql;
EXECUTE stmt1 ;
DEALLOCATE PREPARE stmt1;

OPEN hcymysql_cursor;

select_loop: LOOP

FETCH hcymysql_cursor INTO i;

IF done=1 THEN
   LEAVE select_loop;
END IF;

SELECT i;

END LOOP select_loop;

CLOSE hcymysql_cursor;

END$$

DELIMITER ;

执行：

mysql> select * from t1;
+------+------+
| id   | name |
+------+------+
|    1 | a    |
|    2 | b    |
|    3 | cc   |
|    4 | d    |
|    5 | e    |
|    6 | f    |
|    7 | g    |
|    8 | h    |
|    9 | i    |
|    9 | h    |
+------+------+
10 rows in set (0.03 sec)

mysql> call hcymysql('t1');
+------+
| i    |
+------+
|    1 |
+------+
1 row in set (0.17 sec)

+------+
| i    |
+------+
|    2 |
+------+
1 row in set (0.19 sec)

+------+
| i    |
+------+
|    3 |
+------+
1 row in set (0.21 sec)

+------+
| i    |
+------+
|    4 |
+------+
1 row in set (0.23 sec)

+------+
| i    |
+------+
|    5 |
+------+
1 row in set (0.26 sec)

+------+
| i    |
+------+
|    6 |
+------+
1 row in set (0.29 sec)

+------+
| i    |
+------+
|    7 |
+------+
1 row in set (0.32 sec)

+------+
| i    |
+------+
|    8 |
+------+
1 row in set (0.35 sec)

+------+
| i    |
+------+
|    9 |
+------+
1 row in set (0.37 sec)

+------+
| i    |
+------+
|    9 |
+------+
1 row in set (0.40 sec)

Query OK, 0 rows affected (0.43 sec)