Mysql Procedure及实例

mysql存储过程学习总结,MYSQL Create Procedure,mysql相关存储过程的函数用法！

mysql 5.0存储过程学习总结

mysql存储过程的创建，删除，调用及其他常用命令

mysql 5.0存储过程学习总结

一.创建存储过程

1.基本语法：create procedure sp_name()
begin
………
end

2.参数传递

二.调用存储过程

1.基本语法：call sp_name()
注意：存储过程名称后面必须加括号，哪怕该存储过程没有参数传递

三.删除存储过程

1.基本语法：
drop procedure sp_name//
2.注意事项
(1)不能在一个存储过程中删除另一个存储过程，只能调用另一个存储过程

四.区块，条件，循环

1.区块定义，常用
begin
……
end;
也可以给区块起别名，如：
lable:begin
………..
end lable;
可以用leave lable;跳出区块，执行区块以后的代码
2.条件语句 if 条件 then
statement
else
statement
end if;

3.循环语句
(1).while循环

[label:] WHILE expression DO

statements

END WHILE [label] ;
(2).loop循环 [label:] LOOP

statements

END LOOP [label];(3).repeat until循环 [label:] REPEAT

statements

UNTIL expression

END REPEAT [label] ;

五.其他常用命令

1.show procedure status
显示数据库中所有存储的存储过程基本信息，包括所属数据库，存储过程名称，创建时间等
2.show create procedure sp_name
显示某一个存储过程的详细信息

mysql存储过程中要用到的运算符

mysql存储过程学习总结－操作符

算术运算符

+     加   SET var1=2+2;       4
-     减   SET var2=3-2;       1
*     乘   SET var3=3*2;       6
/     除   SET var4=10/3;      3.3333
DIV   整除 SET var5=10 DIV 3;  3
%     取模 SET var6=10%3 ;     1

比较运算符

>            大于 1>2 False
<            小于 2<1 False
<=           小于等于 2<=2 True
>=           大于等于 3>=2 True
BETWEEN      在两值之间 5 BETWEEN 1 AND 10 True
NOT BETWEEN  不在两值之间 5 NOT BETWEEN 1 AND 10 False
IN           在集合中 5 IN (1,2,3,4) False
NOT IN       不在集合中 5 NOT IN (1,2,3,4) True
=            等于 2=3 False
<>, !=       不等于 2<>3 False
<=>          严格比较两个NULL值是否相等 NULL<=>NULL True
LIKE         简单模式匹配 "Guy Harrison" LIKE "Guy%" True
REGEXP       正则式匹配 "Guy Harrison" REGEXP "[Gg]reg" False
IS NULL      为空 0 IS NULL False
IS NOT NULL  不为空 0 IS NOT NULL True

逻辑运算符

与(AND)TRUE

或(OR)

异或(XOR)

位运算符

|   位或
&   位与
<<  左移位
>>  右移位
~   位非(单目运算，按位取反)

 

mysq存储过程中常用的函数，字符串类型操作，数学类，日期时间类。

mysql存储过程基本函数

一.字符串类 

CHARSET(str) //返回字串字符集
CONCAT (string2  [,... ]) //连接字串
INSTR (string ,substring ) //返回substring首次在string中出现的位置,不存在返回0
LCASE (string2 ) //转换成小写
LEFT (string2 ,length ) //从string2中的左边起取length个字符
LENGTH (string ) //string长度
LOAD_FILE (file_name ) //从文件读取内容
LOCATE (substring , string  [,start_position ] ) 同INSTR,但可指定开始位置
LPAD (string2 ,length ,pad ) //重复用pad加在string开头,直到字串长度为length
LTRIM (string2 ) //去除前端空格
REPEAT (string2 ,count ) //重复count次
REPLACE (str ,search_str ,replace_str ) //在str中用replace_str替换search_str
RPAD (string2 ,length ,pad) //在str后用pad补充,直到长度为length
RTRIM (string2 ) //去除后端空格
STRCMP (string1 ,string2 ) //逐字符比较两字串大小,
SUBSTRING (str , position  [,length ]) //从str的position开始,取length个字符,
注：mysql中处理字符串时，默认第一个字符下标为1，即参数position必须大于等于1mysql> select substring(’abcd’,0,2);
+———————–+
| substring(’abcd’,0,2) |
+———————–+
|                       |
+———————–+
1 row in set (0.00 sec)mysql> select substring(’abcd’,1,2);
+———————–+
| substring(’abcd’,1,2) |
+———————–+
| ab                    |
+———————–+
1 row in set (0.02 sec)

TRIM([[BOTH|LEADING|TRAILING] [padding] FROM]string2) //去除指定位置的指定字符
UCASE (string2 ) //转换成大写
RIGHT(string2,length) //取string2最后length个字符
SPACE(count) //生成count个空格 

二.数学类

ABS (number2 ) //绝对值
BIN (decimal_number ) //十进制转二进制
CEILING (number2 ) //向上取整
CONV(number2,from_base,to_base) //进制转换
FLOOR (number2 ) //向下取整
FORMAT (number,decimal_places ) //保留小数位数
HEX (DecimalNumber ) //转十六进制
注：HEX()中可传入字符串，则返回其ASC-11码，如HEX(’DEF’)返回4142143
也可以传入十进制整数，返回其十六进制编码，如HEX(25)返回19
LEAST (number , number2  [,..]) //求最小值
MOD (numerator ,denominator ) //求余
POWER (number ,power ) //求指数
RAND([seed]) //随机数
ROUND (number  [,decimals ]) //四舍五入,decimals为小数位数]注：返回类型并非均为整数，如：
(1)默认变为整形值
mysql> select round(1.23);
+————-+
| round(1.23) |
+————-+
|           1 |
+————-+
1 row in set (0.00 sec)

mysql> select round(1.56);
+————-+
| round(1.56) |
+————-+
|           2 |
+————-+
1 row in set (0.00 sec)

(2)可以设定小数位数，返回浮点型数据
mysql> select round(1.567,2);
+—————-+
| round(1.567,2) |
+—————-+
|           1.57 |
+—————-+
1 row in set (0.00 sec)

SIGN (number2 ) //返回符号,正负或0
SQRT(number2) //开平方

 
三.日期时间类
 

ADDTIME (date2 ,time_interval ) //将time_interval加到date2
CONVERT_TZ (datetime2 ,fromTZ ,toTZ ) //转换时区
CURRENT_DATE (  ) //当前日期
CURRENT_TIME (  ) //当前时间
CURRENT_TIMESTAMP (  ) //当前时间戳
DATE (datetime ) //返回datetime的日期部分
DATE_ADD (date2 , INTERVAL d_value d_type ) //在date2中加上日期或时间
DATE_FORMAT (datetime ,FormatCodes ) //使用formatcodes格式显示datetime
DATE_SUB (date2 , INTERVAL d_value d_type ) //在date2上减去一个时间
DATEDIFF (date1 ,date2 ) //两个日期差
DAY (date ) //返回日期的天
DAYNAME (date ) //英文星期
DAYOFWEEK (date ) //星期(1-7) ,1为星期天
DAYOFYEAR (date ) //一年中的第几天
EXTRACT (interval_name  FROM date ) //从date中提取日期的指定部分
MAKEDATE (year ,day ) //给出年及年中的第几天,生成日期串
MAKETIME (hour ,minute ,second ) //生成时间串
MONTHNAME (date ) //英文月份名
NOW (  ) //当前时间
SEC_TO_TIME (seconds ) //秒数转成时间
STR_TO_DATE (string ,format ) //字串转成时间,以format格式显示
TIMEDIFF (datetime1 ,datetime2 ) //两个时间差
TIME_TO_SEC (time ) //时间转秒数]
WEEK (date_time [,start_of_week ]) //第几周
YEAR (datetime ) //年份
DAYOFMONTH(datetime) //月的第几天
HOUR(datetime) //小时
LAST_DAY(date) //date的月的最后日期
MICROSECOND(datetime) //微秒
MONTH(datetime) //月
MINUTE(datetime) //分

 

附:可用在INTERVAL中的类型
DAY ,DAY_HOUR ,DAY_MINUTE ,DAY_SECOND ,HOUR ,HOUR_MINUTE ,HOUR_SECOND ,MINUTE ,MINUTE_SECOND,MONTH ,SECOND ,YEAR

 

DELIMITER $$

#更新订单行消费的balance和cash字段
DROP PROCEDURE IF EXISTS fix_cl_consumption_balence_related $$

CREATE PROCEDURE fix_cl_consumption_balence_related (
  IN cl_id BIGINT (20),
  IN mydate DATETIME,
  cost DECIMAL (12, 2),
  cash DECIMAL (12, 2)
) 
BEGIN
  DECLARE no_more_sql INT DEFAULT 0 ;
  DECLARE temp_id BIGINT (20) ;
  DECLARE counter INT DEFAULT 0 ;
  DECLARE sql_cur CURSOR FOR 
  SELECT 
    cc.id 
  FROM
    contract_line_consumption cc 
  WHERE cc.`contract_line_id` = cl_id 
    AND cc.`date` >= mydate 
  ORDER BY cc.date ASC ;
  DECLARE CONTINUE HANDLER FOR NOT FOUND SET no_more_sql = 1 ;
  OPEN sql_cur ;
  REPEAT
    FETCH sql_cur INTO temp_id ;
    IF NOT no_more_sql 
    THEN 
    UPDATE 
      contract_line_consumption cc 
    SET
      cc.balance = cc.balance - cost,
      cc.balance_cash = cc.balance_cash - cash 
    WHERE cc.id = temp_id ;
    SET counter = counter + 1 ;
    END IF ;
    UNTIL no_more_sql 
  END REPEAT ;
  CLOSE sql_cur ;
END $$

#更新recharge_record的cost,cost_cash,amount_availabe and cash_available
DROP PROCEDURE IF EXISTS fix_recharge_record_for_single_contract $$

CREATE PROCEDURE fix_recharge_record_for_single_contract (
  IN cl_id BIGINT (20),
  IN cost DECIMAL (12, 2),
  IN cash DECIMAL (12, 2)
) 
BEGIN
  DECLARE no_more_sql INT DEFAULT 0 ;
  DECLARE i_id BIGINT (20) ;
  DECLARE i_amount_available DECIMAL (12, 2) ;
  DECLARE i_cash_available DECIMAL (12, 2) ;
  DECLARE i_cost DECIMAL (12, 2) ;
  DECLARE i_cost_cash DECIMAL (12, 2) ;
  DECLARE i_ratio DECIMAL (12, 5) ;
  DECLARE temp_cost_cash DECIMAL (12, 2) ;
  DECLARE temp_amount DECIMAL (12, 2) ;
  DECLARE sql_cur CURSOR FOR 
  SELECT 
    rr.id,
    rr.amount_available,
    rr.cash_available,
    rr.cost,
    rr.cost_cash,
    rr.ratio 
  FROM
    recharge_record rr 
  WHERE rr.contract_line_id = cl_id 
  ORDER BY rr.recharge_time ASC ;
  DECLARE CONTINUE HANDLER FOR NOT FOUND SET no_more_sql = 1 ;
  SET temp_amount = cost ;
  OPEN sql_cur ;
  REPEAT
    FETCH sql_cur INTO i_id,
    i_amount_available,
    i_cash_available,
    i_cost,
    i_cost_cash,
    i_ratio ;
    IF NOT no_more_sql 
    THEN IF i_amount_available > 0 && i_cash_available > 0 
    THEN IF temp_amount <> 0 
    THEN IF temp_amount >= i_amount_available 
    THEN SET temp_amount = temp_amount - i_amount_available ;
    UPDATE 
      recharge_record rr 
    SET
      rr.cost = rr.amount,
      rr.cost_cash = rr.cash 
    WHERE rr.id = i_id ;
    UPDATE 
      recharge_record rr 
    SET
      rr.amount_available = 0,
      rr.cash_available = 0 
    WHERE rr.id = i_id ;
    ELSE SET temp_cost_cash = temp_amount * i_ratio ;
    UPDATE 
      recharge_record rr 
    SET
      rr.cost = rr.cost + temp_amount,
      rr.cost_cash = rr.cost_cash + temp_cost_cash,
      rr.amount_available = rr.amount_available - temp_amount,
      rr.cash_available = rr.cash_available - temp_cost_cash 
    WHERE rr.id = i_id ;
    SET temp_amount = 0 ;
    END IF ;
    END IF ;
    END IF ;
    END IF ;
    UNTIL no_more_sql 
  END REPEAT ;
  CLOSE sql_cur ;
END $$

DROP PROCEDURE IF EXISTS fix_consumption_from_botton_to_top $$

CREATE PROCEDURE fix_consumption_from_botton_to_top (
  IN i_adc_id BIGINT (20),
  IN i_cost DECIMAL (12, 2),
  IN i_cash DECIMAL (12, 2),
  IN i_date DATETIME,
  IN i_cl_id BIGINT (20)
) 
BEGIN
  #修复ad_consumption的cost,cash
  UPDATE 
    ad_consumption 
  SET
    cost = i_cost,
    cash = i_cash 
  WHERE id = i_adc_id ;
  #更新contract_line_consumption的cost和cash
  UPDATE 
    contract_line_consumption ac 
    INNER JOIN 
      (SELECT 
        SUM(wc.`cost`) AS cost,
        SUM(wc.`cash`) AS cash,
        wc.`contract_line_id` AS contract_line_id 
      FROM
        ad_consumption wc 
      WHERE wc.`contract_line_id` = i_cl_id 
        AND wc.`date` = i_date 
      GROUP BY wc.`contract_line_id`) xx 
      ON xx.`contract_line_id` = ac.`contract_line_id` SET ac.cost = xx.cost,
    ac.cash = xx.cash 
  WHERE ac.`date` = i_date ;
  #更新订单行的balance和balence_cash(cc之前为0)
  UPDATE 
    contract_line cl 
    INNER JOIN contract_line_consumption cc 
      ON cc.`contract_line_id` = cl.`contract_line_id` 
      AND cc.date = i_date SET cl.`balance` = cl.`balance` - cc.`cost`,
    cl.`balance_cash` = cl.`balance_cash` - cc.`cash` 
  WHERE cl.`contract_line_id` = i_cl_id ;
  #更新订单行消费的balance和cash字段
  CALL fix_cl_consumption_balence_related (i_cl_id, i_date, i_cost, i_cash) ;
  #更新recharge_record的cost,cost_cash,amount_availabe and cash_available
  CALL fix_recharge_record_for_single_contract (i_cl_id, i_cost, i_cash) ;
END $$

DELIMITER ;

CALL fix_consumption_from_botton_to_top (
  341479,
  2654,
  2654 / 2,
  '2013-01-15',
  58197
) ;

DROP PROCEDURE IF EXISTS fix_cl_consumption_balence_related ;

DROP PROCEDURE IF EXISTS fix_recharge_record_for_single_contract ;

DROP PROCEDURE IF EXISTS fix_consumption_from_botton_to_top ;