获取存储过程结果的.NET模式

Question

我在T-SQL中有几个存储过程,其中每个存储过程都有一个固定的结果集模式.

我需要将每个过程的结果集映射到POCO对象,并且需要结果集中每列的列名和类型.有快速访问信息的方法吗？

到目前为止,我发现的最好的方法是从.NET访问每个存储过程,并在IDataReader/IDataRecord上编写我自己的扩展方法,以便转储信息(列名和类型).

例如,执行以下查询的存储过程:

SELECT Id, IntField, NullableIntField, VarcharField, DateField FROM SomeTable

会要求我有映射信息:

Id - Guid
IntField - System.Int32
NullableIntField - Nullable<System.Int32>
VarcharField - String
DateField - DateTime

Answer 1

我认为您应该能够使用SqlDataReader.GetSchemaTable方法来访问架构.

更多信息可以在这里找到.

http://support.microsoft.com/kb/310107

以上来源的例子

SqlConnection cn = new SqlConnection();
SqlCommand cmd = new SqlCommand();
DataTable schemaTable; 
SqlDataReader myReader; 

//Open a connection to the SQL Server Northwind database.
cn.ConnectionString = "Data Source=server;User ID=login;
                       Password=password;Initial Catalog=DB";
cn.Open();

//Retrieve records from the Employees table into a DataReader.
cmd.Connection = cn;
cmd.CommandText = "SELECT Id, IntField, NullableIntField, VarcharField, DateField FROM SomeTable";

myReader = cmd.ExecuteReader(CommandBehavior.KeyInfo);

//Retrieve column schema into a DataTable.
schemaTable = myReader.GetSchemaTable();

//For each field in the table...
foreach (DataRow myField in schemaTable.Rows){
    //For each property of the field...
    foreach (DataColumn myProperty in schemaTable.Columns) {
    //Display the field name and value.
    Console.WriteLine(myProperty.ColumnName + " = " + myField[myProperty].ToString());
    }
    Console.WriteLine();

    //Pause.
    Console.ReadLine();
}

//Always close the DataReader and connection.
myReader.Close();
cn.Close();