解析SQL 表结构信息查询 含主外键、自增长_MySQL

bitsCN.com 最近项目需要做什么数据字典，需要表结构信息。在网上看了许多关于表结构信息的查询，感觉都不怎么样。相对好一点就是《基于SQL2005 SQL2008 表结构信息查询升级版的详解(含外键信息)》 ，但是这里有一点小问题，缺少一个过滤以致运行有一点小bug。在AdventureWorks2012数据库中的Address表查询结果如图：

在查询过滤中我们添加以下信息就ok了：
AND g.class_desc = 'OBJECT_OR_COLUMN'
修改后的SQL如下：

SELECT  表名 = CASE WHEN a.colorder = 1 THEN d.name
                  ELSE ''
             END ,
        表说明 = CASE WHEN a.colorder = 1 THEN ISNULL(f.value, '')
                   ELSE ''
              END ,
        字段序号 = a.colorder ,
        字段名 = a.name ,
        标识 = CASE WHEN COLUMNPROPERTY(a.id, a.name, 'IsIdentity') = 1 THEN '√'
                  ELSE ''
             END ,
        主键 = 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 = so.name
                                                              AND so.xtype = 'PK'
                                WHERE   sc.id = a.id
                                        AND sc.colid = a.colid ) THEN '√'
                  ELSE ''
             END ,
        外键 = CASE WHEN tony.fkey IS NOT NULL
                       AND tony.fkey = a.colid THEN '√'
                  ELSE ''
             END ,
        外键表 = CASE WHEN tony.fkey IS NOT NULL
                        AND tony.fkey = a.colid THEN OBJECT_NAME(tony.fkeyid)
                   ELSE ''
              END ,
        外键字段 = CASE WHEN tony.fkey IS NOT NULL
                         AND tony.fkey = a.colid
                    THEN ( SELECT   name
                           FROM     syscolumns
                           WHERE    colid = tony.fkey
                                    AND id = tony.fkeyid
                         )
                    ELSE ''
               END ,
        类型 = b.name ,
        长度 = a.length ,
        精度 = COLUMNPROPERTY(a.id, a.name, 'PRECISION') ,
        小数位数 = ISNULL(COLUMNPROPERTY(a.id, a.name, 'Scale'), 0) ,
        允许空 = CASE WHEN a.isnullable = 1 THEN '√'
                   ELSE ''
              END ,
        默认值 = ISNULL(e.text, '') ,
        字段说明 = ISNULL(g.[value], '') ,
        创建时间 = d.crdate ,
        更改时间 = CASE WHEN a.colorder = 1 THEN d.refdate
                    ELSE NULL
               END
FROM    dbo.syscolumns a
        LEFT JOIN dbo.systypes b ON a.xtype = b.xusertype
        INNER JOIN dbo.sysobjects d ON a.id = d.id
                                       AND d.xtype = 'U'
                                       AND d.status >= 0
        LEFT JOIN dbo.syscomments e ON a.cdefault = e.id
        LEFT JOIN sys.extended_properties g ON a.id = g.major_id
                                               AND a.colid = g.minor_id
                                               AND g.class_desc = 'OBJECT_OR_COLUMN'
        LEFT JOIN sys.extended_properties f ON d.id = f.major_id
                                               AND f.minor_id = 0
        LEFT JOIN sysobjects htl ON htl.parent_obj = d.id
                                    AND htl.xtype = 'F'
        LEFT JOIN sysforeignkeys tony ON htl.id = tony.constid
WHERE   d.name = 'Address'  --这里输入包含表名称的条件
ORDER BY d.id ,
        a.colorder

运行结果如图：

我不怎么喜欢它的“类型”信息，一般的varchar都会有长度信息，还有这个查询对于SQL 2012的新数据类型不支持，该SQL里面的嵌套查询比较多，于是我就自己重新写了一个SQL。
这里提醒大家尽量用INFORMATION_SCHEMA.XXX视图而不去用sys.XXX视图。
新的SQL如下：

SELECT
 --OBJECT_ID(a.TABLE_SCHEMA + '.' + a.TABLE_NAME) AS [object_id] ,
        CASE WHEN a.ORDINAL_POSITION = 1
             THEN a.TABLE_SCHEMA + '.' + a.TABLE_NAME
             ELSE ''
        END AS TABLE_NAME ,
        CASE WHEN ( a.ORDINAL_POSITION = 1
                    AND p1.value IS NOT NULL
                  ) THEN p1.value
             ELSE ''
        END AS TABLE_Description ,
        a.COLUMN_NAME ,
        CASE WHEN ( ( CHARINDEX('char', a.DATA_TYPE) > 0
                      OR CHARINDEX('binary', a.DATA_TYPE) > 0
                    )
                    AND a.CHARACTER_MAXIMUM_LENGTH -1
                  )
             THEN a.DATA_TYPE + '('
                  + CAST(a.CHARACTER_MAXIMUM_LENGTH AS VARCHAR(4)) + ')'
             WHEN ( ( CHARINDEX('CHAR', a.DATA_TYPE) > 0
                      OR CHARINDEX('binary', a.DATA_TYPE) > 0
                    )
                    AND a.CHARACTER_MAXIMUM_LENGTH = -1
                  ) THEN a.DATA_TYPE + '(max)'
             WHEN ( CHARINDEX('numeric', a.DATA_TYPE) > 0 )
             THEN a.DATA_TYPE + '(' + CAST(a.NUMERIC_PRECISION AS VARCHAR(4))
                  + ',' + CAST(a.NUMERIC_SCALE AS VARCHAR(4)) + ')'
             ELSE a.DATA_TYPE
        END AS COLUMN_TYPE ,
        CASE WHEN c.IS_IDENTITY = 1 THEN 'YES'
             ELSE 'NO'
        END AS IS_IDENTITY ,
        a.IS_NULLABLE ,
        CASE WHEN a.COLUMN_DEFAULT IS NULL THEN ''
             ELSE a.COLUMN_DEFAULT
        END AS Default_Value ,
        CASE WHEN p.value IS NULL THEN ''
             ELSE p.value
        END AS [COLUMN_Description] ,
        CASE WHEN o.name IS  NULL THEN ''
             ELSE '√'
        END AS Is_PrimaryKey ,
        CASE WHEN f.parent_column_id IS NULL THEN ''
             ELSE '√'
        END AS Is_Foreignkeys ,
        CASE WHEN referenced_object_id IS NULL THEN ''
             ELSE OBJECT_NAME(referenced_object_id)
        END AS Foreign_Table ,
        CASE WHEN referenced_object_id IS NULL THEN ''
             ELSE ( SELECT  name
                    FROM    sys.columns
                    WHERE   object_id = f.referenced_object_id
                            AND column_id = f.referenced_column_id
                  )
        END AS Foreign_key
FROM    INFORMATION_SCHEMA.COLUMNS a
        INNER JOIN sys.columns c ON OBJECT_ID(a.TABLE_SCHEMA + '.'
                                              + a.TABLE_NAME) = c.OBJECT_ID
                                    AND a.COLUMN_NAME = c.NAME
        LEFT JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE b ON a.TABLE_SCHEMA = b.TABLE_SCHEMA
                                                           AND a.TABLE_NAME = b.TABLE_NAME
                                                           AND a.COLUMN_NAME = b.COLUMN_NAME
        LEFT JOIN sys.sysobjects o ON o.name = b.CONSTRAINT_NAME
                                      AND o.xtype = 'PK'
        LEFT JOIN sys.extended_properties p ON OBJECT_ID(a.TABLE_SCHEMA + '.'
                                                         + a.TABLE_NAME) = p.major_id
                                               AND a.Ordinal_position = p.minor_id
                                               AND p.class_desc = 'OBJECT_OR_COLUMN'
        LEFT JOIN sys.extended_properties p1 ON OBJECT_ID(a.TABLE_SCHEMA + '.'
                                                          + a.TABLE_NAME) = p1.major_id
                                                AND p1.minor_id = 0
        LEFT JOIN SYS.foreign_key_columns f ON OBJECT_ID(a.TABLE_SCHEMA + '.'
                                                         + a.TABLE_NAME) = f.parent_object_id
                                               AND a.ORDINAL_POSITION = f.parent_column_id
WHERE   a.TABLE_NAME = 'Address'
-- a.TABLE_NAME IN (SELECT name FROM sys.tables)
ORDER BY a.TABLE_SCHEMA,a.TABLE_NAME, a.ORDINAL_POSITION

运行效果如图：

有不对的地方还请大家拍砖！谢谢！bitsCN.com