SQL Server 递归子节点、父节点sql查询表结构的简单示例

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一、查询当前部门下的所有子部门

 

代码如下：

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

 

代码如下：

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

 

代码如下：

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)

 

代码如下：

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;

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关键词：SQL SERVER