mysql存储过程

--------------------------------------mysql存储过程------------------------
--无参的
drop procedure sp_test;
create procedure sp_test()
begin
select * from news;
end
call sp_test();

--参数为in
drop procedure sp_test1;
create procedure sp_test1(
in $v_id int
)
begin
select * from news where id =$v_id;
end
call sp_test1(2);

drop procedure sp_test2;
create procedure sp_test2(
in $v_id int,
in $v_title varchar(20)
)
begin
set @sql = concat('select * from news where  title like \'%',$v_title,'%\'');
PREPARE ps from @sql;
EXECUTE ps;
end
call sp_test2(2,'睡');

--参数为out
DROP procedure sp_test3;
create procedure sp_test3(
out $value varchar(20)
)
begin
set $value = '123';
end

SET @value='';
call sp_test3(@value);
select @value;

--参数为in与out
create procedure sp_test4(
in $v_id int,
in $v_title varchar(20),
out $value varchar(20)
)
begin
set @sql = concat('select * from news where  title like \'%',$v_title,'%\'');
PREPARE ps from @sql;
EXECUTE ps;
set $value = '123';
end
SET @value='';
call sp_test4(2,'睡',@value);
select @value;

----通用分页
CREATE  PROCEDURE `sp_page`(
        in $v_filedList varchar(2000),
        in $v_tables varchar(400),
        in $v_condition varchar(4000),
        in $v_order SMALLINT,
        in $v_primaryKey VARCHAR(20),
        in $v_currentPage BIGINT,
        in $v_maxRecords BIGINT,
        out $v_totalRecords BIGINT,
        out $v_totalPages BIGINT
    )
begin
   set @total=concat('select count(*) into @totalRecords from ',$v_tables) ;
 PREPARE ps from @total;
    EXECUTE ps;
    set $v_totalRecords=@totalRecords;
   
    set $v_totalPages=round($v_totalRecords/$v_maxRecords);
   
 IF!($v_currentPage is null or $v_currentPage='') then
     IF $v_currentPage<1  THEN
         set $v_currentPage=1;
        else
         if $v_currentPage>=$v_totalPages THEN
             set $v_currentPage=$v_totalPages;
            end if;
        end if;
    else
     set $v_currentPage=1;
    end if;
    set @star=($v_currentPage-1)*$v_maxRecords;
    set @v_sql=CONCAT('select ',$v_filedList ,' from ',$v_tables);
    
    if !($v_condition is null or $v_condition='') then
     set @v_sql=concat(@v_sql,' where ',$v_condition);
    end if;
    if !($v_primaryKey is null or $v_primaryKey='') then
         if $v_order=1 then
             set @v_sql=concat(@v_sql,' order by ',$v_primaryKey,' asc');
            end if;
            if $v_order=2 then
             set @v_sql=concat(@v_sql,' order by ',$v_primaryKey,' desc');
            end if;
            if $v_order=3 then
             set @v_sql=concat(@v_sql,'order by ',$v_primaryKey);
            end if;
    end if;
   
    set @v_sql=concat(@v_sql,' limit ',@star ,' , ',$v_maxRecords);
    prepare ps from @v_sql;
    execute ps;

end;

 

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1
 

mysql> 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