在MySQL中,CREATE FUNCTION语句用于创建用户自定义函数。为了保证数据库的安全性和正确性,我们可以使用授权机制对CREATE FUNCTION语句进行控制。授权用户可以使用GRANT语句,而撤销权限可以使用REVOKE语句。 通过授权和撤销CREATE FUNCTION权限,我们可以更好地管理用户对函数的创建和修改,提高数据库的安全性和可维护性。
1 row in set (0.00 sec) mysql> drop function myFunction; Query OK, 0 rows affected (0.00 sec)
CREATE function f1() returns int BEGIN commit; return 1; END; 1. 2. 3. 4. 5. SQL Error [1422] [HY000]: Explicit or implicit commit is not allowed in stored function or trigger. 因为在procedure的set x=fi()的场景里面,一个set语句包含了begin work和commit work,如果f1有commit的话会影响...
The function is intended to return the word count of a text field from the database and called as such: SELECT word_count(mytextfield) FROM mytable I'm getting the following error: #1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server ve...
delimiter//create function hello (schar(20)) returnschar(50)returnconcat('Hello,',s,'!');//delimiter ; mysql> delimiter//mysql> create procedure simpleproc (inparam1int,outparam2int)->BEGIN->selectcount(*) into param2fromstudentswheresid>param1;->END;->//Query OK,0rows affected (0.06...
A loadable function is a way to extend MySQL with a new function that works like a native (built-in) MySQL function such asABS()orCONCAT(). SeeAdding a Loadable Function. function_nameis the name that should be used in SQL statements to invoke the function. TheRETURNSclause indicates the...
pos Position of this clause in the SQL statement. mem_root MEM_ROOT to use for allocation is_temporary True if CREATE TEMPORARY TABLE only_if_not_exists True if CREATE TABLE ... IF NOT EXISTS table_name CREATE TABLE ... <table name> opt_table_element_list NULL or a list of ...
1. 今天刚装了mysql8.0.13,试着分配几个账号和权限,结果报错: 2. 查资料得知mysql8的分配权限不能带密码隐士创建账号了,要先创建账号再设置权限 输入命令:Grant all privileges on test.* to 'test'@'%'; 又报错:You are not allowed to create a user with GRANT;
In this blog, we provide a comprehensive guide with practical examples of MySQL indexes. Explore MySQL CREATE INDEX, functional indexes and more in MySQL 8.0.
I need to create a function with a parameter which is a string (like '(12+45+8)/10') and I want as result a DECIMAL representing the result of the expression (6.5). I have been able to do that through a procedure (using a PREPARE and a EXECUTE) but I can't do the same in...