Sql Server之数据库规范——1自动化规范命名

Posted 2020-06-18

 

一、废话：

随着数据库的规模越来越大，数据库的表也有成百上千，如果需要对数据库表名及字段名做操作，单个还好，直接一条语句搞定了，但如果要对整个库的所有表和字段名做操作，那就显得有点麻烦了。因此，我们需要利用sql语句做批量表名字段名修改操作。

二、了解部分系统表： 

1、获取所有数据库名:

SELECT NAME
FROM   MASTER..SysDatabases

2、获取所有用户表名:

SELECT NAME
FROM   sysobjects
WHERE  TYPE = ‘U‘

3、获取所有字段名:

SELECT NAME
FROM   SysColumns
WHERE  id = OBJECT_ID(‘TableName‘)

三、用游标实现修改所有表名和字段名：

DECLARE @tablename VARCHAR(50) 
DECLARE @columnname VARCHAR(50) 
DECLARE cur_table CURSOR  
FOR
    SELECT NAME
    FROM   sysobjects
    WHERE  TYPE = ‘U‘
           AND NAME <> ‘sysdiagrams‘

OPEN cur_table  FETCH NEXT FROM cur_table INTO @tablename 
WHILE @@fetch_status = 0
BEGIN
    -----------------------------------------
    DECLARE cur_column CURSOR  
    FOR
        SELECT NAME
        FROM   syscolumns
        WHERE  id = OBJECT_ID(@tablename)
    
    OPEN cur_column FETCH NEXT FROM cur_column INTO @columnname 
    WHILE @@fetch_status = 0
    BEGIN
        DECLARE @columnnamefirstchar     CHAR(1),
                @tablenamefirstchar      CHAR(1),
                @ch                      VARCHAR(50),
                @ch1                     VARCHAR(50),
                @uppertablename          VARCHAR(50)
        
        SET @columnnamefirstchar = SUBSTRING(@columnname, 1, 1)
        SET @tablenamefirstchar = SUBSTRING(@tablename, 1, 1)
        IF ASCII(@columnnamefirstchar) BETWEEN ASCII(‘A‘) AND ASCII(‘Z‘)
        BEGIN
            SET @ch = @tablename + ‘.‘ + @columnname   
            SET @ch1 = LOWER(@columnnamefirstchar) + SUBSTRING(@columnname, 2, LEN(@columnname) -1)   
            EXEC sp_rename @ch,
                 @ch1,
                 ‘column‘
        END
        
        IF ASCII(@tablenamefirstchar) BETWEEN ASCII(‘a‘) AND ASCII(‘z‘)
        BEGIN
            SET @uppertablename = UPPER(@tablenamefirstchar) + SUBSTRING(@tablename, 2, LEN(@tablename) -1)   
            EXEC sp_rename @tablename,
                 @uppertablename
        END
        
        FETCH NEXT FROM cur_column INTO @columnname
    END CLOSE cur_column DEALLOCATE cur_column
    ----------------------------------------- 
    FETCH NEXT FROM cur_table INTO @tablename
END CLOSE cur_table DEALLOCATE cur_table

执行后整个数据库的表名都会变成首字母大写，字段名首字母都会变成小写。