sql server递归子节点、父节点,sql查询表结构,根据字段名查所在表

日期:2019-12-08编辑作者:数据库

一、查询当前部门下的所有子部门

 

WITH    dept
       AS ( SELECT   *
               FROM     dbo.deptTab --部门表
               WHERE    pid = @id
               UNION ALL
               SELECT   d.*
               FROM     dbo.deptTab d
                        INNER JOIN dept ON d.pid = dept.id
             )
    SELECT  *
    FROM    dept

 

二、查询当前部门所有上级部门

 

WITH    tab
          AS ( SELECT   DepId ,
                        ParentId ,
                        DepName ,
                        [Enable] ,
                        0 AS [Level]
               FROM     deptTab WITH ( NOLOCK )  --表名
               WHERE    [Enable] = 1
                        AND depId = @depId
               UNION ALL
               SELECT   b.DepId ,
                        b.ParentId ,
                        b.DepName ,
                        b.[Enable] ,
                        a.[Level] + 1
               FROM     tab a ,
                        deptTab b WITH ( NOLOCK )
               WHERE    a.ParentId = b.depId
                        AND b.[enable] = 1
             )
    SELECT  *
    FROM    tab WITH ( NOLOCK )
    WHERE   [enable] = 1
    ORDER BY [level] DESC

 

三、查询当前表的说明描述

 

SELECT  tbs.name 表名 ,
        ds.value 描述
FROM    sys.extended_properties ds
        LEFT JOIN sysobjects tbs ON ds.major_id = tbs.id
WHERE   ds.minor_id = 0
        AND tbs.name = 'userTab';--表名

 

四、查询当前表的表结构(字段名、属性、默认值、说明等)

 

SELECT  CASE WHEN col.colorder = 1 THEN obj.name
             ELSE ''
        END AS 表名 ,
        col.colorder AS 序号 ,
        col.name AS 列名 ,
        ISNULL(ep.[value], '') AS 列说明 ,
        t.name AS 数据类型 ,
        col.length AS 长度 ,
        ISNULL(COLUMNPROPERTY(col.id, col.name, 'Scale'), 0) AS 小数位数 ,
        CASE WHEN COLUMNPROPERTY(col.id, col.name, 'IsIdentity') = 1 THEN '√'
             ELSE ''
        END AS 标识 ,
        CASE WHEN EXISTS ( SELECT   1
                           FROM     dbo.sysindexes si
                                    INNER JOIN dbo.sysindexkeys sik ON si.id = sik.id
                                                              AND si.indid = sik.indid
                                    INNER JOIN dbo.syscolumns sc ON sc.id = sik.id
                                                              AND sc.colid = sik.colid
                                    INNER JOIN dbo.sysobjects so ON so.name = si.name
                                                              AND so.xtype = 'PK'
                           WHERE    sc.id = col.id
                                    AND sc.colid = col.colid ) THEN '√'
             ELSE ''
        END AS 主键 ,
        CASE WHEN col.isnullable = 1 THEN '√'
             ELSE ''
        END AS 允许空 ,
        ISNULL(comm.text, '') AS 默认值
FROM    dbo.syscolumns col
        LEFT  JOIN dbo.systypes t ON col.xtype = t.xusertype
        INNER JOIN dbo.sysobjects obj ON col.id = obj.id
                                         AND obj.xtype = 'U'
                                         AND obj.status >= 0
        LEFT  JOIN dbo.syscomments comm ON col.cdefault = comm.id
        LEFT  JOIN sys.extended_properties ep ON col.id = ep.major_id
                                                 AND col.colid = ep.minor_id
                                                 AND ep.name = 'MS_Description'
        LEFT  JOIN sys.extended_properties epTwo ON obj.id = epTwo.major_id
                                                    AND epTwo.minor_id = 0
                                                    AND epTwo.name = 'MS_Description'
WHERE   obj.name = 'userTab'--表名(点此修改)  
ORDER BY col.colorder;

 五、根据字段名查询所在表

SELECT  sys.objects.name ,
        sys.columns.NAME ,
        max_length ,
        create_date
FROM    [数据库名].sys.columns
        INNER JOIN [数据库名].sys.objects ON sys.columns.object_id = sys.objects.object_id
WHERE   type_desc = 'USER_TABLE'
        AND sys.columns.name = '字段名'

 

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