众所周知，当我们想要返回结果时，最好使用函数。因此，当我们创建存储函数来操作表（例如插入或更新值）时，它或多或少类似于存储过程。在下面的示例中，我们将创建一个名为“tbl_update”的存储函数，它将更新名为“student_marks”的表中的值。
mysql> select * from student_marks//+---------+------+---------+---------+---------+| name | math | english | science | history |+---------+------+---------+---------+---------+| raman | 95 | 89 | 85 | 81 || rahul | 90 | 87 | 86 | 81 || mohit | 90 | 85 | 86 | 81 || saurabh | null | null | null | null |+---------+------+---------+---------+---------+4 rows in set (0.00 sec)mysql> create function tbl_update(s_name varchar(50),m1 int,m2 int,m3 int,m4 int) -> returns int -> deterministic -> begin -> update student_marks set math = m1,english = m2, science = m3, history =m4 where name = s_name; -> return 1; -> end //query ok, 0 rows affected (0.03 sec)mysql> select tbl_update('saurabh',85,69,75,82);+------------------------------------+| tbl_update('saurabh',85,69,75,82) |+------------------------------------+| 1 |+------------------------------------+1 row in set (0.07 sec)mysql> select * from student_marks;+---------+------+---------+---------+---------+| name | math | english | science | history |+---------+------+---------+---------+---------+| raman | 95 | 89 | 85 | 81 || rahul | 90 | 87 | 86 | 81 || mohit | 90 | 85 | 86 | 81 || saurabh | 85 | 69 | 75 | 82 |+---------+------+---------+---------+---------+4 rows in set (0.00 sec)
以上就是如何编写一个 mysql 存储函数来更新表中的值？的详细内容。