Question

我需要在选择查询时从表格的值中替换表格的字段值。

例如：

表1：

Org                  Permission
--------------------------------------
Company1             1,3,7
Company2             1,3,8

表2：

Permission          Permission
--------------------------------------
1                   Read
3                   Write
7                   Execute
8                   Delete

我需要这样：

Org                  Permission
--------------------------------------
Company1             Read,Write,Execute
Company2             Read,Write,Delete

Answer 1

我一直关注你的帖子，因为它在Oracle中被标记：D

在oracle中它有很多可能的方式，但在mysql中你必须在程序的帮助下遵循它：

架构：

create table table1 (org varchar(50), permission_id varchar(50));
create table table2 (permission_id int, permission_name varchar(50));

insert into table1 values ('Company1','1,3,7'),('Company2','1,3,8');
insert into table2 values (1,'Read'),(3,'Write'),(7,'Execute'),(8,'Delete');

步骤：

    DELIMITER $$

DROP PROCEDURE IF EXISTS `Update_Table_data`$$

CREATE PROCEDURE `Update_Table_data`()
BEGIN
    declare max_row int;
    declare p1 int;
    Set p1 = 0;
    SET max_row = (SELECT max(@i:=@i+1) AS row_num FROM table2 AS t,(SELECT @i:=0) AS foo);

    label1: LOOP
    set p1 = p1 + 1;
    IF p1 <= max_row THEN
        UPDATE Table1
        SET permission_id = 
        replace(permission_id, (select permission_id from 
                    (SELECT @i:=@i+1 AS row_num ,t.* FROM table2 AS t,(SELECT @i:=0) AS foo) a
                    where row_num = p1), 
            (select permission_name from 
            (SELECT @i:=@i+1 AS row_num ,t.* FROM table2 AS t,(SELECT @i:=0) AS foo) a
            where row_num = p1));       
        Iterate label1;
    END IF;    
        LEAVE label1;
    END LOOP label1;
    -- SET @x = p1;
    END$$

DELIMITER ;

然后拨打电话更新您的值：

call Update_Table_data;

希望有所帮助：）

Answer 2

有关初始数据，请参阅SQLFiddle，这是结果数据SQLFiddle

UPDATE 
    organization
SET 
    permisson = (SELECT 
                   GROUP_CONCAT(VALUE) 
                 FROM 
                  ( SELECT 
                      org,
                      SUBSTRING_INDEX(permisson,',',1) AS `permisson`
                    FROM 
                      organization 

                    UNION 

                    SELECT
                      org,
                      SUBSTRING_INDEX(SUBSTRING_INDEX(permisson,',',2),',',-1) AS `permisson` 
                     FROM 
                    organization

                    UNION 

                    SELECT
                      org,
                      SUBSTRING_INDEX(permisson,',',-1) AS `permisson` 
                    FROM 
                      organization
                   ) AS t 

                   JOIN 

                   permission p 

                   WHERE 
                    p.p_id = t.permisson AND 
                    t.org = organization.org 
                   GROUP BY org
)

Answer 3

尝试使用REPLACE替换您的号码。仅当您使用单个数字值进行许可时才能正常工作。

    SQL = " SELECT Org, REPLACE(REPLACE(REPLACE(REPLACE(Permission,"1","Read'"),"3","Write'"),"7","Execute'"),"8","Delete'") as Permission FROM myTable "

REPLACE()

Mysql替换另一个表的字段中的字段

3 个答案: