数据字典是个好东东，对于开发、维护非常重要。
但Sql Server中写描述确实不方便，如何化繁为简、批量地增加修改扩展属性呢？
增加2个表和5个存储过程、2个触发器、1个表值函数就好了。
把下面的SQL执行一遍生成相关的对象， 然后执行一下：
1. EXEC Proc_Util_Desc_GetColumnNameToDescTable , 生成表的描述对应记录
2. EXEC Proc_Util_Desc_GetTableNameToDescTable, 生成列的描述对应记录
3. 查看, 修改一下 dc_util_column_desc 中的某个表某个列的描述，
4. 查看: select * from [dbo].[Fun_GetTableStru]('表名')
爽吧？！
--1.1 建表(存放表的描述)：dbo.dc_util_table_descIF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[dc_util_table_desc]') AND type in (N'U')) DROP TABLE [dbo].[dc_util_table_desc]GOCREATE TABLE [dbo].[dc_util_table_desc]( [id] [int] IDENTITY(1,1) NOT NULL, [tableName] [varchar](100) NULL, [tableDesc] [nvarchar](200) NULL, CONSTRAINT [PK_dc_util_table_desc] PRIMARY KEY CLUSTERED ( [id] ASC)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]) ON [PRIMARY]GO--1.2 建表(存放列的描述)：[dc_util_column_desc]IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[dc_util_column_desc]') AND type in (N'U')) DROP TABLE [dbo].[dc_util_column_desc]GOCREATE TABLE [dbo].[dc_util_column_desc]( [id] [int] IDENTITY(1,1) NOT NULL, [tableName] [varchar](100) NULL, [columnName] [varchar](100) NULL, [columnDesc] [nvarchar](200) NULL, CONSTRAINT [PK_dc_util_column_desc] PRIMARY KEY CLUSTERED ( [id] ASC)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY], CONSTRAINT [UQ_dc_util_column_desc_tableName_columnName] UNIQUE NONCLUSTERED ( [tableName] ASC, [columnName] ASC)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]) ON [PRIMARY]GO--2.1 存储过程IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[Proc_Util_Desc_DeleteInvalidData]') AND type in (N'P', N'PC')) DROP PROCEDURE [dbo].[Proc_Util_Desc_DeleteInvalidData]GO-- =============================================-- Author: yenange-- Create date: 2014-05-29-- Description: 删除 dc_util_table_desc 表和 -- dc_util_column_desc 表中不正确的数据-- =============================================CREATE PROCEDURE [dbo].[Proc_Util_Desc_DeleteInvalidData] ASBEGIN SET NOCOUNT ON; --删除 dc_util_table_desc 中的无效数据 DELETE FROM dbo.dc_util_table_desc WHERE NOT EXISTS ( SELECT 1 FROM sys.tables T WHERE dbo.dc_util_table_desc.tableName=T.name ) --删除 dc_util_column_desc 中的无效数据 DELETE FROM dbo.dc_util_column_desc WHERE NOT EXISTS (SELECT 1 FROM sys.tables t INNER JOIN sys.columns c ON t.object_id = c.object_id WHERE t.SCHEMA_ID IN (SELECT SCHEMA_ID FROM sys.schemas WHERE NAME = 'dbo') AND dbo.dc_util_column_desc.tableName=t.name AND dbo.dc_util_column_desc.columnName=c.name )ENDGO--2.2 存储过程IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[Proc_Util_Desc_GetTableNameToDescTable]') AND type in (N'P', N'PC')) DROP PROCEDURE [dbo].[Proc_Util_Desc_GetTableNameToDescTable]GO-- =============================================-- Author: -- Create date: 2014-05-29-- Description: 将以 @tablePrefix 为前缀的表名和表对应的扩展属性 insert 到 dc_util_table_desc 表中去.-- @tablePrefix 如果为 '' 或者 null， 则为全部表(默认为null)-- @overrideDesc : 如果已有记录存在，是否覆盖原记录的扩展属性 (默认为1)-- =============================================CREATE procedure [dbo].[Proc_Util_Desc_GetTableNameToDescTable] @tablePrefix VARCHAR(100) =null, @overrideDesc BIT =1AS BEGIN SET NOCOUNT ON --删除表中无效的数据 exec Proc_Util_Desc_DeleteInvalidData DECLARE @t1 TABLE(rn int IDENTITY(1,1),tablename VARCHAR(100),tabledesc NVARCHAR(200)) --插入以 @tablePrefix [email protected] INSERT INTO @t1 ( tablename, tabledesc ) SELECT convert(VARCHAR(100),t.name), convert (nvarchar(200),p.value) FROM sys.tables AS t LEFT JOIN sys.extended_properties AS p ON p.major_id = t.object_id AND p.minor_id = 0 AND p.class = 1 AND p.name = 'MS_Description' WHERE t.SCHEMA_ID IN (SELECT SCHEMA_ID FROM sys.schemas WHERE NAME = 'dbo') AND (ISNULL(@tablePrefix,'')='' or t.name LIKE [email protected]+'%' ) DECLARE @i INT DECLARE @i_max INT DECLARE @t_name VARCHAR(100) DECLARE @t_desc NVARCHAR(200) SET @i=1 SELECT @i_max=COUNT(1) FROM @t1 WHILE @i<[email protected]_max BEGIN SELECT @t_name=tablename,@t_desc=tabledesc FROM @t1 WHERE [email protected] IF @overrideDesc=1 begin IF EXISTS(SELECT 1 FROM dc_util_table_desc WHERE [email protected]_name) UPDATE dc_util_table_desc SET tableDesc = @t_desc WHERE [email protected]_name ELSE INSERT INTO dc_util_table_desc(tablename,tableDesc) VALUES (@t_name,@t_desc) END ELSE BEGIN IF NOT EXISTS(SELECT 1 FROM dc_util_table_desc WHERE [email protected]_name) INSERT INTO dc_util_table_desc(tablename,tableDesc) VALUES (@t_name,@t_desc) END set @[email protected]+1 ENDENDGO--2.3 存储过程IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[Proc_Util_Desc_GetColumnNameToDescTable]') AND type in (N'P', N'PC')) DROP PROCEDURE [dbo].[Proc_Util_Desc_GetColumnNameToDescTable]GO-- =============================================-- Author: -- Create date: 2014-05-29-- Description: 将以 @tablePrefix 为前缀的表名对应的列和列对应的扩展属性 insert 到 dc_util_column_desc 表中去.-- @tablePrefix 如果为 '' 或者 null， 则为全部表(默认为null)-- @overrideDesc : 如果已有记录存在，是否覆盖原记录的扩展属性 (默认为1)-- =============================================CREATE procedure [dbo].[Proc_Util_Desc_GetColumnNameToDescTable] @tablePrefix VARCHAR(100) =null, @overrideDesc BIT =1AS BEGIN SET NOCOUNT ON --删除表中无效的数据 exec Proc_Util_Desc_DeleteInvalidData DECLARE @t1 TABLE(rn int IDENTITY(1,1),tablename VARCHAR(100),COLUMNNAME VARCHAR(100),columndesc NVARCHAR(200)) --插入以 @tablePrefix [email protected] INSERT INTO @t1 ( tablename, COLUMNNAME, columndesc ) SELECT convert(varchar(100),t.name) , convert(varchar(100),c.name) , convert(nvarchar(200),p.value) FROM sys.tables AS t LEFT JOIN sys.columns c ON t.object_id = c.object_id LEFT JOIN sys.extended_properties AS p ON p.major_id = t.object_id AND p.minor_id = c.column_id AND p.class = 1 AND p.name = 'MS_Description' WHERE t.SCHEMA_ID IN (SELECT SCHEMA_ID FROM sys.schemas WHERE NAME = 'dbo') AND (ISNULL(@tablePrefix,'')='' or t.name LIKE [email protected]+'%') DECLARE @i INT DECLARE @i_max INT DECLARE @t_name VARCHAR(100) DECLARE @col_name VARCHAR(100) DECLARE @col_desc NVARCHAR(200) SET @i=1 SELECT @i_max=COUNT(1) FROM @t1 WHILE @i<[email protected]_max BEGIN SELECT @t_name=tablename,@col_name=COLUMNNAME,@col_desc=columndesc FROM @t1 WHERE [email protected] IF @overrideDesc=1 begin IF EXISTS(SELECT 1 FROM dc_util_column_desc WHERE [email protected]_name AND [email protected]_name) UPDATE dc_util_column_desc SET columnDesc = @col_desc WHERE [email protected]_name AND [email protected]_name ELSE INSERT INTO dc_util_column_desc(tablename,columnName,columnDesc) VALUES (@t_name,@col_name,@col_desc) END ELSE BEGIN IF NOT EXISTS(SELECT 1 FROM dc_util_column_desc WHERE [email protected]_name AND [email protected]_name ) INSERT INTO dc_util_column_desc(tablename,columnName,columnDesc) VALUES (@t_name,@col_name,@col_desc) END set @[email protected]+1 ENDENDGO--2.4 存储过程IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[Proc_Util_Desc_SetDescToTable]') AND type in (N'P', N'PC')) DROP PROCEDURE [dbo].[Proc_Util_Desc_SetDescToTable]GO-- =============================================-- Author: -- Create date: 2014-05-29-- Description: 将 dc_util_table_desc 表中的 tableDesc 写到对应表的扩展属性-- @tablePrefix 为表前缀 如果为 '' 或者 null， 则为全部表(默认为null)-- =============================================CREATE PROCEDURE [dbo].[Proc_Util_Desc_SetDescToTable] @tablePrefix varchar(100) = nullASBEGIN SET NOCOUNT ON --删除表中无效的数据 exec Proc_Util_Desc_DeleteInvalidData --定义表变量 DECLARE @t1 TABLE(rn int IDENTITY(1,1),tablename VARCHAR(100),tabledesc NVARCHAR(200)) [email protected] INSERT INTO @t1 ( tablename, tabledesc ) SELECT tablename,tabledesc FROM dc_util_table_desc WHERE ISNULL(@tablePrefix,'')='' OR tablename LIKE [email protected]+'%' --循环表变量中的数据 DECLARE @i INT DECLARE @i_max INT DECLARE @t_name VARCHAR(100) DECLARE @t_desc NVARCHAR(200) SET @i=1 SELECT @i_max=COUNT(1) FROM @t1 WHILE @i<[email protected]_max BEGIN SELECT @t_name=tablename,@t_desc=tabledesc FROM @t1 WHERE [email protected] IF isnull(@t_desc,'')='' BEGIN SET @[email protected]+1 CONTINUE END --如果表上存在MS_Description就update,不存在就insert IF EXISTS (SELECT p.value FROM sys.tables AS t LEFT JOIN sys.extended_properties AS p ON p.major_id = t.object_id WHERE t.SCHEMA_ID IN (SELECT SCHEMA_ID FROM sys.schemas WHERE NAME = 'dbo') AND p.minor_id = 0 AND p.class = 1 AND p.name = 'MS_Description' AND t.name [email protected]_name) BEGIN EXEC sp_updateextendedproperty @name = N'MS_Description' ,@value = @t_desc ,@level0type = N'Schema', @level0name = 'dbo' ,@level1type = N'Table', @level1name = @t_name END ELSE BEGIN EXEC sp_addextendedproperty @name = N'MS_Description' ,@value = @t_desc ,@level0type = N'Schema', @level0name = 'dbo' ,@level1type = N'Table', @level1name = @t_name END SET @[email protected]+1 ENDENDGO--2.5 存储过程IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[Proc_Util_Desc_SetDescToColumn]') AND type in (N'P', N'PC')) DROP PROCEDURE [dbo].[Proc_Util_Desc_SetDescToColumn]GO-- =============================================-- Author: -- Create date: 2014-05-29-- Description: 将dc_util_column_desc 表中的 columnDesc 写到对应表对应列的扩展属性-- @tablePrefix 为表前缀 如果为 '' 或者 null， 则为全部表(默认为null)-- =============================================CREATE PROCEDURE [dbo].[Proc_Util_Desc_SetDescToColumn] @tablePrefix varchar(100) = nullASBEGIN SET NOCOUNT ON --删除表中无效的数据 exec Proc_Util_Desc_DeleteInvalidData --定义表变量 DECLARE @t1 TABLE(rn int IDENTITY(1,1),tablename VARCHAR(100),columnname VARCHAR(100),columndesc NVARCHAR(200)) -- [email protected] INSERT INTO @t1 ( tablename, columnname, columndesc ) SELECT tablename,columnname,columndesc FROM dc_util_column_desc WHERE ISNULL(@tablePrefix,'')='' or tablename LIKE [email protected]+'%' --循环表变量中的数据 DECLARE @i INT DECLARE @i_max INT DECLARE @t_name VARCHAR(100) DECLARE @col_name VARCHAR(100) DECLARE @col_desc NVARCHAR(200) SET @i=1 SELECT @i_max=COUNT(1) FROM @t1 WHILE @i<[email protected]_max BEGIN SELECT @t_name=tablename,@col_name=columnname,@col_desc=columndesc FROM @t1 WHERE [email protected] IF ISNULL(@col_desc,'')='' BEGIN SET @[email protected]+1 CONTINUE END --如果列上存在MS_Description就update,不存在就add IF EXISTS (SELECT p.value FROM sys.tables AS t LEFT JOIN sys.extended_properties AS p ON p.major_id = t.object_id LEFT JOIN sys.columns c ON t.object_id=c.object_id AND c.column_id=p.minor_id WHERE t.SCHEMA_ID IN (SELECT SCHEMA_ID FROM sys.schemas WHERE NAME = 'dbo') AND p.class = 1 AND p.minor_id!=0 AND p.name = 'MS_Description' AND t.name = @t_name AND c.name = @col_name) BEGIN EXEC sp_updateextendedproperty @name = N'MS_Description' ,@value = @col_desc ,@level0type = N'Schema', @level0name = 'dbo' ,@level1type = N'Table', @level1name = @t_name ,@level2type = N'Column', @level2name = @col_name END ELSE BEGIN EXEC sp_addextendedproperty @name = N'MS_Description' ,@value = @col_desc ,@level0type = N'Schema', @level0name = 'dbo' ,@level1type = N'Table', @level1name = @t_name ,@level2type = N'Column', @level2name = @col_name END SET @[email protected]+1 ENDENDGO--3.1 触发器 IF EXISTS (SELECT * FROM sys.triggers WHERE object_id = OBJECT_ID(N'[dbo].[Trig_dc_util_table_desc_I_U]')) DROP TRIGGER [dbo].[Trig_dc_util_table_desc_I_U]GO-- =============================================-- Author: -- Create date: 2014-05-29-- Description: 将记录更新到对应表的扩展属性-- =============================================CREATE TRIGGER [dbo].[Trig_dc_util_table_desc_I_U] ON [dbo].[dc_util_table_desc] AFTER INSERT , UPDATEAS BEGIN --触发Proc_Util_SetDescToTable 更新表描述 DECLARE @m VARCHAR(100) SELECT @m=tablename FROM inserted EXEC Proc_Util_Desc_SetDescToTable @[email protected]END--3.2 触发器IF EXISTS (SELECT * FROM sys.triggers WHERE object_id = OBJECT_ID(N'[dbo].[Trig_dc_util_column_desc_I_U]')) DROP TRIGGER [dbo].[Trig_dc_util_column_desc_I_U]GO-- =============================================-- Author: -- Create date: 2014-05-29-- Description: 将记录更新到对应列的扩展属性-- =============================================CREATE TRIGGER [dbo].[Trig_dc_util_column_desc_I_U] ON [dbo].[dc_util_column_desc] AFTER INSERT , UPDATEAS BEGIN --触发Proc_Util_SetDescToColumn 去更新列描述 DECLARE @m VARCHAR(100) SELECT @m=tablename FROM inserted EXEC Proc_Util_Desc_SetDescToColumn @[email protected]END--4.1 查看表的描述IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[Fun_GetTableStru]') AND type in (N'FN', N'IF', N'TF', N'FS', N'FT')) DROP FUNCTION [dbo].[Fun_GetTableStru]GO-- =============================================-- Author: -- Create date: 2014-03-27-- Description: 获取表结构-- Demo: select * from [dbo].[Fun_GetTableStru]('表名')-- =============================================CREATE FUNCTION [dbo].[Fun_GetTableStru] ( @tableName NVARCHAR(MAX))RETURNS TABLE ASRETURN ( SELECT ac.column_id AS columnId ,AC.[name] AS columnName ,TY.[name] AS dataType ,AC.max_length AS maxLength ,AC.[is_nullable] isNullable ,CASE WHEN AC.[name] in (SELECT COLUMN_NAME = convert(sysname,c.name) from sysindexes i, syscolumns c, sysobjects o where o.id = object_id(@tableName) and o.id = c.id and o.id = i.id and (i.status & 0x800) = 0x800 and ( c.name = index_col (@tableName, i.indid, 1) or c.name = index_col (@tableName, i.indid, 2) or c.name = index_col (@tableName, i.indid, 3) or c.name = index_col (@tableName, i.indid, 4) or c.name = index_col (@tableName, i.indid, 5) or c.name = index_col (@tableName, i.indid, 6) or c.name = index_col (@tableName, i.indid, 7) or c.name = index_col (@tableName, i.indid, 8) or c.name = index_col (@tableName, i.indid, 9) or c.name = index_col (@tableName, i.indid, 10) or c.name = index_col (@tableName, i.indid, 11) or c.name = index_col (@tableName, i.indid, 12) or c.name = index_col (@tableName, i.indid, 13) or c.name = index_col (@tableName, i.indid, 14) or c.name = index_col (@tableName, i.indid, 15) or c.name = index_col (@tableName, i.indid, 16) )) THEN 1 ELSE 0 END AS isPK ,CASE WHEN AC.[name] IN ( SELECT t1.name FROM ( SELECT col.name, f.constid AS temp FROM syscolumns col, sysforeignkeys f WHERE f.fkeyid = col.id AND f.fkey = col.colid AND f.constid IN (SELECT DISTINCT(id) FROM sysobjects WHERE OBJECT_NAME(parent_obj) = @tableName AND xtype = 'F') ) AS t1, ( SELECT OBJECT_NAME(f.rkeyid) AS rtableName, col.name, f.constid AS temp FROM syscolumns col, sysforeignkeys f WHERE f.rkeyid = col.id AND f.rkey = col.colid AND f.constid IN (SELECT DISTINCT(id) FROM sysobjects WHERE OBJECT_NAME(parent_obj) = @tableName AND xtype = 'F') ) AS t2 WHERE t1.temp = t2.temp ) THEN 1 ELSE 0 END AS isFK ,(SELECT COLUMNPROPERTY( OBJECT_ID(@tableName),ac.name,'IsIdentity')) AS isIdentity ,ISNULL(t2.[DESCRIPTION], '') AS [columnDesc] ,ISNULL(( SELECT ISNULL(VALUE, '') FROM sys.extended_properties ex_p WHERE ex_p.minor_id = 0 AND ex_p.major_id = t.OBJECT_ID ),'') AS [tableDesc]FROM sys.[tables] AS T INNER JOIN sys.[all_columns] AC ON T.[object_id] = AC.[object_id] INNER JOIN sys.[types] TY ON AC.[system_type_id] = TY.[system_type_id] AND AC.[user_type_id] = TY.[user_type_id] LEFT JOIN ( SELECT DISTINCT(sys.columns.name), ( SELECT VALUE FROM sys.extended_properties WHERE sys.extended_properties.major_id = sys.columns.object_id AND sys.extended_properties.minor_id = sys.columns.column_id ) AS DESCRIPTION FROM sys.columns, sys.tables, sys.types WHERE sys.columns.object_id = sys.tables.object_id AND sys.columns.system_type_id = sys.types.system_type_id AND sys.tables.name = @tableName ) AS t2 ON AC.name=t2.nameWHERE T.[is_ms_shipped] = 0 AND [email protected])GO