从sql server表列中检索描述项

Question

是否可以通过使用connection.getschema（）从sql Server表列中检索描述项，就像可以检索列名，数据类型，可为空，列默认值等一样？ 如果是这样，怎么办？

Answer 1

尝试这个：

    SELECT 
    [Table Name] = i_s.TABLE_NAME, 
    [Column Name] = i_s.COLUMN_NAME, 
    [Description] = s.value 
FROM 
    INFORMATION_SCHEMA.COLUMNS i_s 
LEFT OUTER JOIN 
    sys.extended_properties s 
ON 
    s.major_id = OBJECT_ID(i_s.TABLE_SCHEMA+'.'+i_s.TABLE_NAME) 
    AND s.minor_id = i_s.ORDINAL_POSITION 
    AND s.name = 'MS_Description' 
WHERE 
    OBJECTPROPERTY(OBJECT_ID(i_s.TABLE_SCHEMA+'.'+i_s.TABLE_NAME), 'IsMsShipped')=0 
    --AND i_s.TABLE_NAME = 'table_name' 
ORDER BY 
    i_s.TABLE_NAME, i_s.ORDINAL_POSITION

编辑：修复查询:-)

高温超导

Answer 2

在Sql Server 2005上，可以使用以下系统表值函数：

fn_listextendedproperty（Transact-SQL）

或尝试通过本文的查询，如下所示：

SELECT  
    [Table Name] = OBJECT_NAME(c.object_id), 
    [Column Name] = c.name, 
    [Description] = ex.value  
FROM  
    sys.columns c  
LEFT OUTER JOIN  
    sys.extended_properties ex  
ON  
    ex.major_id = c.object_id 
    AND ex.minor_id = c.column_id  
    AND ex.name = 'MS_Description'  
WHERE  
    OBJECTPROPERTY(c.object_id, 'IsMsShipped')=0  
    -- AND OBJECT_NAME(c.object_id) = 'your_table' 
ORDER  
    BY OBJECT_NAME(c.object_id), c.column_id

Answer 3

如您所述，如果您已经拥有DataTable，请查看其数据列！

foreach(DataColumn col in dataTable.Columns)
{
  // check out all the properties on the DataColumn
}

那包含您需要的东西吗？