我正在尝试使用 c#、.net 2.0 和 SQLServer 2012 Express 将 DataTable 发送到存储过程。
这大致就是我正在做的:
//define the DataTable
var accountIdTable = new DataTable("[dbo].[TypeAccountIdTable]");
//define the column
var dataColumn = new DataColumn {ColumnName = "[ID]", DataType = typeof (Guid)};
//add column to dataTable
accountIdTable.Columns.Add(dataColumn);
//feed it with the unique contact ids
foreach (var uniqueId in uniqueIds)
{
accountIdTable.Rows.Add(uniqueId);
}
using (var sqlCmd = new SqlCommand())
{
//define command details
sqlCmd.CommandType = CommandType.StoredProcedure;
sqlCmd.CommandText = "[dbo].[msp_Get_Many_Profiles]";
sqlCmd.Connection = dbConn; //an open database connection
//define parameter
var sqlParam = new SqlParameter();
sqlParam.ParameterName = "@tvp_account_id_list";
sqlParam.SqlDbType = SqlDbType.Structured;
sqlParam.Value = accountIdTable;
//add parameter to command
sqlCmd.Parameters.Add(sqlParam);
//execute procedure
rResult = sqlCmd.ExecuteReader();
//print results
while (rResult.Read())
{
PrintRowData(rResult);
}
}
但随后出现以下错误:
ArgumentOutOfRangeException: No mapping exists from SqlDbType Structured to a known DbType.
Parameter name: SqlDbType
经过进一步调查(在 MSDN、SO 和其他地方),似乎 .net 2.0 不支持向数据库发送 DataTable(缺少 SqlParameter.TypeName
等内容),但我我仍然不确定,因为我还没有看到任何人明确声称此功能在 .net 2.0 中不可用
这是真的吗?
如果是这样,是否有另一种方法可以将数据集合发送到数据库?
提前致谢!
最佳答案
开箱即用,ADO.NET 不支持它是有充分理由的。 DataTable 可以包含任意数量的列,这些列可能会或可能不会映射到数据库中的真实表。
如果我理解你想要做什么 - 将 DataTable 的内容快速上传到具有相同结构的预定义真实表,我建议你调查 SQLBulkCopy .
来自文档:
Microsoft SQL Server includes a popular command-prompt utility named bcp for moving data from one table to another, whether on a single server or between servers. The SqlBulkCopy class lets you write managed code solutions that provide similar functionality. There are other ways to load data into a SQL Server table (INSERT statements, for example), but SqlBulkCopy offers a significant performance advantage over them.
The SqlBulkCopy class can be used to write data only to SQL Server tables. However, the data source is not limited to SQL Server; any data source can be used, as long as the data can be loaded to a DataTable instance or read with a IDataReader instance.
SqlBulkCopy will fail when bulk loading a DataTable column of type SqlDateTime into a SQL Server column whose type is one of the date/time types added in SQL Server 2008.
但是,您可以在更高版本的 SQL Server 中定义表值参数,并使用它以您要求的方法发送表 (DateTable)。在 http://sqlwithmanoj.wordpress.com/2012/09/10/passing-multipledynamic-values-to-stored-procedures-functions-part4-by-using-tvp/ 有一个例子
关于c# - 将 DataTable 作为参数发送到存储过程,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/14112128/