Stored procedure study notes

Stored procedure study notes

//定义“$$”为存储过程分割符 此处是为了与mysql “;”为结束符区分
DELIMITER $$
//"s"为参数 
//1.IN：参数的值必须在调用存储过程时指定，在存储过程中修改该参数的值不能被返回，为默认值
//2.OUT: 该值可在存储过程内部被改变，并可返回
//3.INOUT:调用时指定，并且可被改变和返回
  CREATE PROCEDURE myproc(OUT s int)
  //BEGIN:过程体的开始标志
    BEGIN
      //DECLARE: 声明变量并赋予默认值“”
      DECLARE x1 VARCHAR(5) DEFAULT 'our';
      //SET:为变量赋值  “@”开头为用户变量
      //"--":为存储过程中的单行注释符
      SET @last_proc='p1';
      SELECT COUNT(*) INTO s FROM students;
      //END：过程体的结束标志
    END
    $$
DELIMITER ; 

//DROP PROCEDURE IF EXISTS "xxx":如果xxx过程存在 则删除
DROP PROCEDURE IF EXISTS `proc_categroy_names`;
DELIMITER $$
//CREATE PROCEDURE "xxx"：创建名为“xxx”的存储过程
CREATE PROCEDURE `proc_categroy_names`(IN serviceId int,OUT categoryName VARCHAR(64))
BEGIN
  	DECLARE  categoryId BIGINT;   -- id
  //声明 遍历数据结束标志 done
  DECLARE done INT DEFAULT FALSE;
  //为select 结果集创建游标 “cur_category” ，“CURSOR”为游标类型
  DECLARE cur_category CURSOR FOR select category_id from service_category_relation where service_id = serviceId;
  //将结束标志绑定到游标
  DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
  //声明“categoryName” 变量并赋值空字符串
  	set categoryName = '';
  //打开游标
  OPEN  cur_category; 
  //遍历
  read_loop: LOOP
          //取值 取多个字段
          FETCH  NEXT from cur_category INTO categoryId;
          //没有数据 跳出循环  下面的赋值set categoryName 将不会再被执行到
          IF done THEN
              LEAVE read_loop;
            //"END IF":if 结束标志
           END IF;

      		//为 categoryName 赋值
  			set categoryName = CONCAT(categoryName,(select category_name as categoryName from category_info where category_id = categoryId),',');
  //循环结束标志
  END LOOP;
  //关闭游标
  CLOSE cur_category;
END
$$
DELIMITER ;

//call:调用存储过程
call proc_export(1);

#查询存储过程
SELECT name FROM mysql.proc WHERE db='数据库名';
SELECT routine_name FROM information_schema.routines WHERE routine_schema='数据库名';
SHOW PROCEDURE STATUS WHERE db='数据库名';

#查看存储过程详细信息
SHOW CREATE PROCEDURE 数据库.存储过程名;

MySQL存储过程的基本函数
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1
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

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，
SIGN (number2 ) // 正数返回1，负数返回-1

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) //分返回符号,正负或0
SQRT(number2) //开平方

Operation example

DROP PROCEDURE IF EXISTS `proc_repayment_count`;
DELIMITER $$
-- 还款统计存储过程
CREATE PROCEDURE `proc_repayment_count`(IN startTime DATETIME,IN endTime DATETIME,IN pageNum INT,IN pageSize INT,OUT total INT)
BEGIN
		DECLARE  sdate DATE;-- 日期
		DECLARE  repaymentRate CHAR(7);-- 还款表现
		DECLARE  newRepaymentRate CHAR(7);-- 新还款表现
		DECLARE  shouldReturnNum BIGINT DEFAULT 0;-- 应还单数
		DECLARE  shouldReturnAmount DECIMAL DEFAULT 0;-- 应还金额
		DECLARE  alreadyReturnNum BIGINT DEFAULT 0;-- 已还单数
		DECLARE  alreadyReturnAmount DECIMAL DEFAULT 0;-- 已还金额
		DECLARE  newShouldReturnNum BIGINT DEFAULT 0;-- 新应还单数
		DECLARE  newShouldReturnAmount DECIMAL DEFAULT 0;-- 新应还金额
		DECLARE  newAlreadyReturnNum BIGINT DEFAULT 0;-- 新已还单数
		DECLARE  newAlreadyReturnAmount DECIMAL DEFAULT 0;-- 新已还金额
		DECLARE  delayNum BIGINT DEFAULT 0;-- 延期单数
		DECLARE  fullRepaymentNum BIGINT DEFAULT 0;-- 全款还款单数
		
		

-- 遍历数据结束标志
    DECLARE done INT DEFAULT FALSE;
-- 游标
    DECLARE cur_calendar CURSOR FOR SELECT date FROM tmp_calendar;
-- 将结束标志绑定到游标
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;   

		drop table if exists tmp_calendar;
		-- 创建临时日期表
		CREATE TEMPORARY TABLE tmp_calendar(  
				date DATE -- 日期
		)engine = memory;

		WHILE startTime <= endTime DO
 			INSERT IGNORE INTO tmp_calendar VALUES (DATE(startTime)) ;
 			SET startTime = startTime + INTERVAL 1 DAY ;
 		END WHILE ;	 

		drop table if exists tmp_channel_count;
		CREATE TEMPORARY TABLE tmp_channel_count(  
				date CHAR(10),-- 日期
				repaymentRate CHAR(7),-- 还款表现
				newRepaymentRate CHAR(7),-- 新还款表现
				shouldReturnNum BIGINT ,-- 应还单数
				shouldReturnAmount DECIMAL,-- 应还金额
				alreadyReturnNum BIGINT,-- 已还单数
				alreadyReturnAmount DECIMAL,-- 已还金额
				newShouldReturnNum BIGINT,-- 新应还单数
				newShouldReturnAmount DECIMAL,-- 新应还金额
				newAlreadyReturnNum BIGINT,-- 新已还单数
				newAlreadyReturnAmount DECIMAL,-- 新已还金额
				delayNum BIGINT,-- 延期单数
				fullRepaymentNum BIGINT-- 全款还款单数
		);

-- 打开游标
    OPEN  cur_calendar; 
		-- 遍历
    read_loop: LOOP
            -- 取值 取多个字段
            FETCH  NEXT from cur_calendar INTO sdate;
            IF done THEN
                LEAVE read_loop;
             END IF;
				-- 应还单数(final_date:最终还款时间为当前日期+ pay_status 打款状态：打款成功——MAKE_MONEY_SUCCESS)
				SELECT COUNT(1) INTO shouldReturnNum FROM `order` WHERE final_date LIKE CONCAT(sdate ,'%') AND pay_status='MAKE_MONEY_SUCCESS';
				-- 应还金额(SUM(repayment_money))、(final_date:最终还款时间为当前日期+ pay_status 打款状态：打款成功——MAKE_MONEY_SUCCESS)
				SELECT IFNULL(SUM(repayment_money),0) into shouldReturnAmount FROM `order` WHERE final_date LIKE CONCAT(sdate ,'%') AND pay_status='MAKE_MONEY_SUCCESS';
				-- 已还单数(final_date:最终还款时间为当前日期+ pay_status 打款状态：打款成功——MAKE_MONEY_SUCCESS+state:状态——已完成:COMPLETED)
				SELECT COUNT(1) INTO alreadyReturnNum FROM `order` WHERE final_date LIKE CONCAT(sdate ,'%') AND pay_status='MAKE_MONEY_SUCCESS' AND state = 'COMPLETED';
				-- 已还金额(SUM(b.money:金额))、(loan_date:放款时间为当前日期+ pay_status 打款状态：打款成功——MAKE_MONEY_SUCCESS+ b.gmt为当前时间+ b.money_type:billType 流水类型 IN (PART_RPM_AMOUNT:部分还款,RPM_AMOUNT:还款金额,DELAY:延期,UTL_RPM_AMOUNT:线下还款金额,AUTOMATIC_RPM_AMOUNT:自动还款金额,逾期代扣))
				SELECT IFNULL(SUM(b.money),0) into newAlreadyReturnAmount FROM `order` a LEFT JOIN `bill` b ON a.id = b.order_id WHERE a.final_date LIKE CONCAT(sdate ,'%') AND a.pay_status='MAKE_MONEY_SUCCESS' AND b.gmt LIKE CONCAT(sdate ,'%') AND b.money_type IN ('PART_RPM_AMOUNT','RPM_AMOUNT','DELAY','UTL_RPM_AMOUNT','AUTOMATIC_RPM_AMOUNT');
				
        
				-- 还款表现(已还单数/应还单数)
				IF shouldReturnNum <> 0 THEN
					SET repaymentRate = CONCAT(truncate((alreadyReturnNum/shouldReturnNum) * 100,2),'%');
				ELSE
					SET repaymentRate = CONCAT(truncate(0.00,2),'%');
				END IF;

				-- 新应还单数(final_date:最终还款时间为当前日期+ pay_status 打款状态：打款成功——MAKE_MONEY_SUCCESS+loan_term:借款次数=0)
				SELECT COUNT(1) INTO newShouldReturnNum FROM `order` WHERE final_date LIKE CONCAT(sdate ,'%') AND pay_status='MAKE_MONEY_SUCCESS' AND loan_term=0;
				-- 新应还金额(SUM(repayment_money))、(final_date:最终还款时间为当前日期+ pay_status 打款状态：打款成功——MAKE_MONEY_SUCCESS +loan_term:借款次数=0)
				SELECT IFNULL(SUM(repayment_money),0) into shouldReturnAmount FROM `order` WHERE final_date LIKE CONCAT(sdate ,'%') AND pay_status='MAKE_MONEY_SUCCESS' AND loan_term=0;
				-- 新已还单数(final_date:最终还款时间为当前日期+ pay_status 打款状态：打款成功——MAKE_MONEY_SUCCESS+state:状态——已完成:COMPLETED+loan_term:借款次数=0)
				SELECT COUNT(1) INTO newAlreadyReturnNum FROM `order` WHERE final_date LIKE CONCAT(sdate ,'%') AND pay_status='MAKE_MONEY_SUCCESS' AND state = 'COMPLETED' AND loan_term=0;
				-- 新已还金额(SUM(b.money:金额))、(loan_date:放款时间为当前日期+ pay_status 打款状态：打款成功——MAKE_MONEY_SUCCESS+a.loan_term:借款次数=0+ b.gmt为当前时间+ b.money_type:billType 流水类型 IN (PART_RPM_AMOUNT:部分还款,RPM_AMOUNT:还款金额,DELAY:延期,UTL_RPM_AMOUNT:线下还款金额,AUTOMATIC_RPM_AMOUNT:自动还款金额,逾期代扣))
				SELECT IFNULL(SUM(b.money),0) into alreadyReturnAmount FROM `order` a LEFT JOIN `bill` b ON a.id = b.order_id WHERE a.final_date LIKE CONCAT(sdate ,'%') AND a.pay_status='MAKE_MONEY_SUCCESS' AND a.loan_term=0 AND b.gmt LIKE CONCAT(sdate ,'%') AND b.money_type IN ('PART_RPM_AMOUNT','RPM_AMOUNT','DELAY','UTL_RPM_AMOUNT','AUTOMATIC_RPM_AMOUNT');

				-- 新还款表现(新已还单数/新应还单数)
				IF newShouldReturnNum <> 0 THEN
					SET newRepaymentRate = CONCAT(truncate((newAlreadyReturnNum/newShouldReturnNum) * 100,2),'%');
				ELSE
					SET newRepaymentRate = CONCAT(truncate(0.00,2),'%');
				END IF;

				-- 延期单数(gmt为当前日期)
				SELECT COUNT(1) INTO delayNum FROM order_bill WHERE gmt LIKE CONCAT(sdate ,'%');
				-- 全款还款单数(real_repayment_date:实际还款时间为当前日期 + pay_status 打款状态：打款成功——MAKE_MONEY_SUCCESS +state:状态——已完成:COMPLETED)
				SELECT COUNT(1) INTO fullRepaymentNum FROM `order` WHERE real_repayment_date LIKE CONCAT(sdate ,'%') AND pay_status='MAKE_MONEY_SUCCESS' AND state = 'COMPLETED';
				
				-- 存入临时表 tmp_channel_count
				INSERT INTO tmp_channel_count(date,repaymentRate,newRepaymentRate,shouldReturnNum,shouldReturnAmount,alreadyReturnNum,alreadyReturnAmount,newShouldReturnNum,newShouldReturnAmount,newAlreadyReturnNum,newAlreadyReturnAmount,delayNum,fullRepaymentNum) VALUES(sdate,repaymentRate,newRepaymentRate,shouldReturnNum,shouldReturnAmount,alreadyReturnNum,alreadyReturnAmount,newShouldReturnNum,newShouldReturnAmount,newAlreadyReturnNum,newAlreadyReturnAmount,delayNum,fullRepaymentNum);
				
		END LOOP;
    CLOSE cur_calendar;
		SET pageNum = (pageNum - 1) * pageSize;
		SELECT COUNT(1) INTO total FROM tmp_channel_count;
		select t.date,t.repaymentRate,t.newRepaymentRate,t.shouldReturnNum,t.shouldReturnAmount,t.alreadyReturnNum,t.alreadyReturnAmount,t.newShouldReturnNum,t.newShouldReturnAmount,t.newAlreadyReturnNum,t.newAlreadyReturnAmount,t.delayNum,t.fullRepaymentNum from tmp_channel_count t ORDER BY t.date DESC LIMIT pageNum,pageSize;
END$$
DELIMITER ;

 -- 执行
SET @total = 0;
CALL proc_repayment_count('2019-03-01 00:00:00','2019-04-20 23:59:59',1,50,@total);
SELECT @total;