Question

你好，美好的一天.. 在使用shell或cmd进行存储过程查询时，我需要一些帮助。这是我的bookAuthor表

+-------------+-------------+------+-----+---------+----------------+
| Field       | Type        | Null | Key | Default | Extra          |
+-------------+-------------+------+-----+---------+----------------+
| authorID    | int(11)     | NO   | PRI | NULL    | auto_increment |
| authorLname | varchar(50) | YES  |     | NULL    |                |
| authorFname | varchar(50) | YES  |     | NULL    |                |
| authorMname | varchar(50) | YES  |     | NULL    |                |
+-------------+-------------+------+-----+---------+----------------+`

如果我使用单个操作而不使用if语句（如下面的查询），则效果很好

 MariaDB [library]> create procedure selectAll()
    -> select * from bookAuthor;
Query OK, 0 rows affected (0.60 sec)

但是如果我使用if语句并在下面放置类似查询的参数

 MariaDB [library]> create procedure insertUpdateSelectDelete
    -> (
    -> id int(11),
    -> lname varchar(50),
    -> fname varchar(50),
    -> mname varchar(50),
    -> statementtype varchar(30)
    -> )
    -> if statementtype = 'Insert'
    -> insert into bookAuthor
    -> (
    -> authorLname,
    -> authorFname,
    -> authorMname
    -> )
    -> values
    -> (
    -> lname,
    -> fname,
    -> mname
    -> )
    -> if statementtype = 'Update'
    -> update bookAuthor set
    -> authorLname = lname,
    -> authorFname = fname,
    -> authorMname = mname
    -> where authorID = id
    -> if statementtype = 'Select'
    -> select * from bookAuthor
    -> if statementtype = 'Delete'
    -> delete from bookAuthor where authorID = id;

它将返回这样的错误

 ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'insert into bookAuthor
(
authorLname,
authorFname,
authorMname
)
values
(
lname,' at line 10

Answer 1

您的代码有很多问题。首先，IF语句在条件之后需要THEN，并且必须以END IF终止。其次，该过程中的所有语句必须以;结尾。尝试以下方法：

create procedure insertUpdateSelectDelete(
    id int(11),
    lname varchar(50),
    fname varchar(50),
    mname varchar(50),
    statementtype varchar(30)
)
begin
    if statementtype = 'Insert' then
        insert into bookAuthor (authorLname,authorFname,authorMname)
        values (lname,fname,mname);
    elseif statementtype = 'Update' then
        update bookAuthor
        set authorLname = lname, authorFname = fname, authorMname = mname
        where authorID = id;
    elseif statementtype = 'Select' then
        select * from bookAuthor;
    elseif statementtype = 'Delete' then
        delete from bookAuthor where authorID = id;
    end if;
end

请注意，如果像我一样将过程编写为IF/ELSEIF块，则由于过程中只有一个语句，因此您并不一定需要BEGIN/END包装器。

这是该过程的demo on dbfiddle。

mariaDB语法错误（具有if语句和参数的存储过程）

1 个答案: