在添加之前检查扩展属性描述是否已存在

时间：2013-06-18 15:44:43

标签： sql sql-server exists extended-properties database-table

所以，我有一个添加扩展属性的脚本，一些描述一个表，一些描述一个列。如何在添加扩展属性之前检查扩展属性是否存在，以便脚本不会抛出错误？

6 个答案:

答案 0 :(得分：53)

第一个脚本检查描述该表的扩展属性是否存在：

IF NOT EXISTS (SELECT NULL FROM SYS.EXTENDED_PROPERTIES WHERE [major_id] = OBJECT_ID('Table_Name') AND [name] = N'MS_Description' AND [minor_id] = 0)
EXECUTE sp_addextendedproperty @name = N'MS_Description', @value = N'This table is responsible for holding information.', @level0type = N'SCHEMA', @level0name = N'dbo', @level1type = N'TABLE', @level1name = N'Table_Name';

第二个脚本检查描述该列的扩展属性是否存在：

IF NOT EXISTS (SELECT NULL FROM SYS.EXTENDED_PROPERTIES WHERE [major_id] = OBJECT_ID('Table_Name') AND [name] = N'MS_Description' AND [minor_id] = (SELECT [column_id] FROM SYS.COLUMNS WHERE [name] = 'Column_Name' AND [object_id] = OBJECT_ID('Table_Name')))
EXECUTE sp_addextendedproperty @name = N'MS_Description', @value = N'This column is responsible for holding information for table Table_Name.', @level0type = N'SCHEMA', @level0name = N'dbo', @level1type = N'TABLE', @level1name = N'Table_Name', @level2type = N'COLUMN', @level2name = N'Column_Name';

答案 1 :(得分：5)

这是另一种类似于Ruslan K的存储过程方法，但它不涉及try / catch或显式事务：

-- simplify syntax for maintaining data dictionary

IF OBJECT_ID ('dbo.usp_addorupdatedescription', 'P') IS NOT NULL
    DROP PROCEDURE dbo.usp_addorupdatedescription;
GO

CREATE PROCEDURE usp_addorupdatedescription
        @table nvarchar(128),  -- table name
        @column nvarchar(128), -- column name, NULL if description for table
        @descr sql_variant     -- description text
AS
    BEGIN
        SET NOCOUNT ON;

        IF @column IS NOT NULL
            IF NOT EXISTS (SELECT NULL FROM SYS.EXTENDED_PROPERTIES
            WHERE [major_id] = OBJECT_ID(@table) AND [name] = N'MS_Description'
                  AND [minor_id] = (SELECT [column_id]
                                    FROM SYS.COLUMNS WHERE [name] = @column AND [object_id] = OBJECT_ID(@table)))
                EXECUTE sp_addextendedproperty @name = N'MS_Description', @value = @descr,
                                               @level0type = N'SCHEMA', @level0name = N'dbo', @level1type = N'TABLE',
                                               @level1name = @table, @level2type = N'COLUMN', @level2name = @column;
            ELSE
                EXECUTE sp_updateextendedproperty @name = N'MS_Description',
                                                  @value = @descr, @level0type = N'SCHEMA', @level0name = N'dbo',
                                                  @level1type = N'TABLE', @level1name = @table,
                                                  @level2type = N'COLUMN', @level2name = @column;
        ELSE
            IF NOT EXISTS (SELECT NULL FROM SYS.EXTENDED_PROPERTIES
            WHERE [major_id] = OBJECT_ID(@table) AND [name] = N'MS_Description'
                  AND [minor_id] = 0)
                EXECUTE sp_addextendedproperty @name = N'MS_Description', @value = @descr,
                                               @level0type = N'SCHEMA', @level0name = N'dbo',
                                               @level1type = N'TABLE', @level1name = @table;
            ELSE
                EXECUTE sp_updateextendedproperty @name = N'MS_Description', @value = @descr,
                                                  @level0type = N'SCHEMA', @level0name = N'dbo',
                                                  @level1type = N'TABLE', @level1name = @table;
    END
GO

答案 2 :(得分：1)

检查可用于给定表的任何扩展属性，如下所示。

IF EXISTS(SELECT 1 FROM sys.extended_properties WHERE [major_id] = OBJECT_ID('<schema>.<table_name>') AND [name] = N'MS_Description')

如果您的表具有多个扩展属性，请将列ID指定为minor_id。

IF EXISTS(SELECT 1 FROM sys.extended_properties WHERE [major_id] = OBJECT_ID('<schema>.<table_name>') AND [name] = N'MS_Description' AND minor_id = 3)

查询sys.extended_properties目录视图以获取数据库中的所有扩展属性。

有关详细信息，请使用http://msdn.microsoft.com/en-us/library/ms177541(v=sql.110).aspx

答案 3 :(得分：1)

也许我的答案没有直接联系到这个问题，但是我想指出MS_Description实际上是区分大小写的，即使我们使用SQL添加它。如果我们使用MS_DESCRIPTION而不是MS_Description，它将不会显示在SMSS表设计视图中。

就我而言，我必须做类似的事情以删除现有描述并添加正确的描述。

IF EXISTS (
    SELECT NULL
    FROM SYS.EXTENDED_PROPERTIES
    WHERE [major_id] = OBJECT_ID('TableName')
        AND [name] = N'MS_DESCRIPTION'
        AND [minor_id] = (
            SELECT [column_id]
            FROM SYS.COLUMNS
            WHERE [name] = 'ColumnName'
                AND [object_id] = OBJECT_ID('Tablename')
            )
    )
    EXEC sys.sp_dropextendedproperty @name = N'MS_DESCRIPTION'
        ,@level0type = N'SCHEMA'
        ,@level0name = N'dbo'
        ,@level1type = N'TABLE'
        ,@level1name = N'TableName'
        ,@level2type = N'COLUMN'
        ,@level2name = N'ColumnName'
    GO

EXEC sys.sp_addextendedproperty @name = N'MS_Description'
,@value = N'Description detail'
,@level0type = N'SCHEMA'
,@level0name = N'dbo'
,@level1type = N'TABLE'
,@level1name = N'TableName'
,@level2type = N'COLUMN'
,@level2name = N'ColumnName'

GO

答案 4 :(得分：1)

请在上面找到我对Brian Westrich答案的扩展，但是此版本允许更新和添加表和列上的所有扩展属性，而不仅仅是MS_Description。另外，它允许您使用存储过程在不同数据库中添加和更新扩展属性，因此服务器上只需要一个副本。

CREATE PROCEDURE dbo.AddOrUpdateExtendedProperty
     @Database      NVARCHAR(128)   -- Database name
    ,@Schema        NVARCHAR(128)   -- Schema name
    ,@Table         NVARCHAR(128)   -- Table name
    ,@Column        NVARCHAR(128)   -- Column name, NULL if description for table
    ,@PropertyName  NVARCHAR(128)   -- Property name
    ,@PropertyValue SQL_VARIANT     -- Property value
AS
BEGIN
    SET NOCOUNT ON;

    DECLARE @NSQL NVARCHAR(MAX);

    DECLARE @Level2Type NVARCHAR(128) = NULL;

    DECLARE @Params NVARCHAR(MAX) = N'@Schema NVARCHAR(128), @Table NVARCHAR(128), @Column NVARCHAR(128), @PropertyName NVARCHAR(128), @PropertyValue SQL_VARIANT';

    IF @Column IS NOT NULL
    BEGIN
        SET @NSQL = 'USE ' + @Database + ';

            IF NOT EXISTS
            (
                SELECT NULL FROM sys.extended_properties
                 WHERE     major_id = OBJECT_ID(''' + @Schema + '.' + @Table + ''')
                       AND name = @PropertyName
                      AND minor_id = (SELECT column_id
                                        FROM sys.columns
                                       WHERE     name = @Column
                                             AND object_id = OBJECT_ID(''' + @Schema + '.' + @Table + ''')
                                     )
            )
            BEGIN
                EXECUTE sp_addextendedproperty
                     @name = @PropertyName
                    ,@value = @PropertyValue
                    ,@level0type = N''SCHEMA''
                    ,@level0name = @Schema
                    ,@level1type = N''TABLE''
                    ,@level1name = @Table
                    ,@level2type = N''COLUMN''
                    ,@level2name = @Column;
            END
            ELSE
            BEGIN
                EXECUTE sp_updateextendedproperty
                     @name = @PropertyName
                    ,@value = @PropertyValue
                    ,@level0type = N''SCHEMA''
                    ,@level0name = @Schema
                    ,@level1type = N''TABLE''
                    ,@level1name = @Table
                    ,@level2type = N''COLUMN''
                    ,@level2name = @Column;
            END
        ';

        EXECUTE sp_executesql
             @NSQL
            ,@Params
            ,@Schema
            ,@Table
            ,@Column
            ,@PropertyName
            ,@PropertyValue;
    END
    ELSE
    BEGIN
        SET @NSQL = 'USE ' + @Database + ';

            IF NOT EXISTS
            (
                SELECT NULL
                  FROM sys.extended_properties
                 WHERE     major_id = OBJECT_ID(''' + @Schema + '.' + @Table + ''')
                       AND name = @PropertyName
                       AND minor_id = 0
            )
            BEGIN
                EXECUTE sp_addextendedproperty
                     @name = @PropertyName
                    ,@value = @PropertyValue
                    ,@level0type = N''SCHEMA''
                    ,@level0name = @Schema
                    ,@level1type = N''TABLE''
                    ,@level1name = @Table;
            END
            ELSE
            BEGIN
                EXECUTE sp_updateextendedproperty
                     @name = @PropertyName
                    ,@value = @PropertyValue
                    ,@level0type = N''SCHEMA''
                    ,@level0name = @Schema
                    ,@level1type = N''TABLE''
                    ,@level1name = @Table;
            END
        ';

        EXECUTE sp_executesql
             @NSQL
            ,@Params
            ,@Schema
            ,@Table
            ,@Column
            ,@PropertyName
            ,@PropertyValue;
    END
END

答案 5 :(得分：0)

基于ScubaSteve的答案，以下查询将使您可以按名称检查指定架构中列或表的MS_Description属性。要检查表，只需将谓词c.name = '<column>'替换为c.name IS NULL或d.minor_id = 0

要使用架构枚举MS_Description属性，请使用-

SELECT a.name as [schema], b.name as [table], c.name as [column], d.name, d.value
FROM sys.schemas a
JOIN sys.tables b ON a.schema_id = b.schema_id
LEFT JOIN sys.columns c ON b.object_id = c.object_id
JOIN sys.extended_properties d ON d.major_id = b.object_id AND d.minor_id = ISNULL(c.column_id,0)
WHERE a.name = '<schema>' AND b.name = '<table>' AND c.name = '<column>' AND d.name = 'MS_Description'

要在添加MS_Description属性之前检查它是否不存在，请使用-

IF NOT EXISTS (SELECT 1 FROM sys.schemas a JOIN sys.tables b ON a.schema_id = b.schema_id LEFT JOIN sys.columns c ON b.object_id = c.object_id JOIN sys.extended_properties d ON d.major_id = b.object_id AND d.minor_id = ISNULL(c.column_id,0)
               WHERE a.name = '<schema>' AND b.name = '<table>' AND c.name = '<column>' AND d.name = 'MS_Description'
               )
BEGIN
    --EXEC sp_addextendedproperty statement goes here
END

这些查询中的联接可能可以更好地进行排序，以消除ISNULL函数，但这应该可以满足您的需求。

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