1)create procedure用来创建存储过程,create function用来创建函数 2)函数与存储过程最大的区别就是函数调用有返回值,调用存储过程用call语句,而调用函数就直接引用函数名+参数即可 3)Definer和sql security子句指定安全环境 Definder是MySQL的特殊的访问控制手段,当数据库当前没有这个用户权限时,执行存储过程可能会报错 sq...
CREATE FUNCTION example_function (param1 INT, param2 VARCHAR(255)) RETURNS INT DETERMINISTIC BEGIN … RETURN result; END; “`
# Python示例代码importmysql.connectordefcall_function():conn=mysql.connector.connect(user='username',password='password',host='localhost',database='test_db')cursor=conn.cursor()cursor.execute('SELECT function_name();')result=cursor.fetchone()print(result)call_function() 1. 2. 3. 4. 5. 6....
create procedure backup() insert into t_bak select * from t; 1. 2. 用CALL 语句调用存储过程 mysql> call backup(); Query OK, 2 rows affected (0.10 sec) 1. 2. 存储过程的处理需要多条 SQL 语句,使用 DELIMITER 命令定义语句定界符 example:备份表记录到备份表后,删除原表的记录 delimiter $$ cr...
The following example function takes a parameter, performs an operation using an SQL function, and returns the result. In this case, it is unnecessary to usedelimiterbecause the function definition contains no internal;statement delimiters: mysql>CREATEFUNCTIONhello(sCHAR(20))->RETURNSCHAR(50)DETERMINI...
CREATEFUNCTIONGTID_INTERSECTION_WITH_UUID(gsLONGTEXT,uuidTEXT)RETURNSLONGTEXTRETURNGTID_SUBTRACT(gs,GTID_SUBTRACT_UUID(gs,uuid))| Example 19.1 Verifying that a replica is up to date The built-in functionsGTID_SUBSET()andGTID_SUBTRACT()can be used to check that a replica has applied at least ...
function_name([parameters]) Example: 创建过程 delimiter//createprocedureprocedure_name([in parameters[,out parameters]])begindo yourworkend//delimiter ; 与创建函数的方法基本一样 调用过程 call procedure_name(in_parameter,@out_parameter); Example: ...
DROP FUNCTION IF EXISTS nextval;DELIMITER $ CREATE FUNCTION nextval(seq_name VARCHAR(50))RETURNS INTEGER LANGUAGE SQL DETERMINISTIC CONTAINS SQL SQL SECURITY DEFINER COMMENT''BEGINUPDATE sequence SET current_value=current_value+increment WHERE name=seq_name;RETURN currval(seq_name);END$ ...
CREATEPROCEDUREAddUser(INuserNameVARCHAR(100),INuserEmailVARCHAR(100))BEGININSERTINTOusers(name,email)VALUES(userName,userEmail);END; 调用存储过程: CALLAddUser('John Doe','john.doe@example.com'); 函数(Function)类似于存储过程,但它有一个返回值,并且只能返回一个值。
CREATE [DEFINER = { user | CURRENT_USER }] FUNCTION sp_name ([func_parameter[,...]]) RETURNS type [characteristic ...] routine_body proc_parameter: [ IN | OUT | INOUT ] param_name type func_parameter: param_name type type: