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 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...
Step 1: Create a Function In this step, we need to create a function to be used in the index. Here is an example of the code to create a function: CREATEFUNCTIONfunction_name(parameters)RETURNSdata_typeBEGIN-- Function logic codeRETURNvalue;END; 1. 2. 3. 4. 5. 6. Make sure to re...
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...
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。
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var connection = mysql.createConnection({ host : process.env.HOST, user : 'root', password : process.env.PASSWORD }); connection.connect(); connection.query('SELECT 1 + 1 AS solution', function (error, results, fields) { if (error) throw error; console.log('The solution is: ', resu...
sc create mysql binPath=mysqld_bin_path(注意:等号与值之间有空格) 连接与断开服务器 代码语言:javascript 代码运行次数:0 运行 AI代码解释 mysql-h 地址-P端口-u 用户名-p 密码SHOWPROCESSLIST--显示哪些线程正在运行SHOWVARIABLES--显示系统变量信息
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:
Before MySQL 5.0.10, stored functions created withCREATE FUNCTIONmust not contain references to tables, with limited exceptions. They may include someSETstatements that contain table references, for exampleSET a:= (SELECT MAX(id) FROM t), andSELECTstatements that fetch values directly into variables...