MySQL 循环分支语法

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Loop循环

label: LOOP
    statement_list

    IF exit_condition THEN
        LEAVE label; 
    END IF; 
END LOOP label;

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Repeat循环

REPEAT
    statement_list
UNTIL search_condition END REPEAT;

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While循环

WHILE search_condition DO
    statement_list
END WHILE;

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IF...ELSE分支判断

IF search_condition THEN
    statement_list
ELSE
    statement_list
END IF;

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IF...ELSEIF...ELSE分支判断

IF search_condition THEN
    statement_list
ELSEIF search_condition THEN
    statement_list
ELSE
    statement_list
END IF;

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CAST分支判断

CASE case_value
    WHEN when_value THEN
        statement_list
    ELSE
        statement_list
END CASE;

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创建存储过程(PROCEDURE)

create PROCEDURE procedure_name([IN|OUT|INOUT] param_name param_type,...)
BEGIN
    statement_list
END

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删除存储过程(PROCEDURE)

DROP PROCEDURE procedure_name

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查看存储过程(PROCEDURE)

SELECT
    * 
FROM
    mysql.proc 
WHERE
    type = 'PROCEDURE'

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创建函数(FUNCTION)

CREATE FUNCTION function_name(param_name param_type,...)
RETURNS return_type
BEGIN
    statement_list
END

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删除函数(FUNCTION)

DROP FUNCTION IF EXISTS function_name

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查看函数(FUNCTION)

SELECT
    * 
FROM
    mysql.proc 
WHERE
    type = 'FUNCTION'

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定义变量赋值

-- 函数(FUNCTION)或存储过程(PROCEDURE)定义变量及赋值
    -- 定义
    DECLARE variable_name variable_type DEFAULT default_value;
    -- 赋值
    SET variable_name = new_value;
    -- 在SELECT查询里进行赋值
    SELECT variable_name := col_name;

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关于定义变量赋值的详细说明：https://www.cnblogs.com/EasonJim/p/7966918.html