Question

我试图将用户定义的表类型传递给C＃中的查询。

类型定义为2列（org和sub org）

这就是我的代码：

DataSet ds = new DataSet();
try
{

    DataTable FilteredOrgSubOrg = new DataTable("OrgSubOrgValueType");
    FilteredOrgSubOrg.Columns.Add("org", typeof(string));
    FilteredOrgSubOrg.Columns.Add("subOrg", typeof(string));
    FilteredOrgSubOrg.Rows.Add(org, orgsub);
    using (SqlConnection conn = new SqlConnection(cCon.getConn()))
    {
        using (SqlCommand cmd = conn.CreateCommand())
        {
            cmd.CommandText = 
                "select * from myTable ex where year = @year' and qtr = @qtr" +
                " and EXISTS(SELECT 1 FROM @OrgSubOrg tt  WHERE ex.org like tt.org" +
                " AND ex.orgsub = tt.suborg  )"+
                " order by ex.org,year, qtr DESC";
            // 2. set the command object so it knows
            // to execute a stored procedure

            // 3. add parameter to command, which
            // will be passed to the stored procedure
            cmd.Parameters.Add(new SqlParameter("@OrgSubOrg", FilteredOrgSubOrg));
            cmd.Parameters.Add(new SqlParameter("@year", year));
            cmd.Parameters.Add(new SqlParameter("@qtr", qtr));


            conn.Open();
            SqlDataAdapter sqlDA = new SqlDataAdapter();

            sqlDA.SelectCommand = cmd;
            sqlDA.Fill(ds);

        }
    }

我是否正确传递参数？

当我在SQL服务器中这样做时：

declare @OrgSubOrg OrgSubOrgValueType
insert into @OrgSubOrg  values ('05%','00000000')
insert into @OrgSubOrg values ('03%','00000000')


------------ complete -----------------------------------
select * from myTable ex
where 
year = '2013' and qtr = '1' 
and EXISTS(
               SELECT 1 
               FROM @OrgSubOrg tt               
               WHERE ex.org like tt.org
                 AND ex.orgsub = tt.suborg  )
order by ex.org,year, qtr DESC

everything works like it should.

我也尝试过这样传递：

  SqlParameter p = cmd.Parameters.Add(new SqlParameter("@OrgSubOrg", SqlDbType.Structured));
                     p.Value = FilteredOrgSubOrg;

但我得到了同样的错误

The table type parameter '@OrgSubOrg' must have a valid type name.

可能是我无法将它传递给SQL命令，我在另一个地方有类似的代码，这对存储过程很有用......？

Answer 1

使用TypeName属性在SqlServer中设置映射到您的类型：获取或设置必须修复的表值参数的类型名称。

p.TypeName = "dbo.MyType";

同时检查Table-Valued Parameters帖子

Answer 2

请注意，当您执行存储过程并且您没有将SqlCommand.CommandType设置为CommandType.StoredProcedure时，也可能会发生这种情况：

using (SqlCommand cmd = new SqlCommand("StoredProcName", conn))
{
    cmd.CommandType = CommandType.StoredProcedure;
    cmd.ExecuteNonQuery();
}

Answer 3

当您想将表参数传递给存储过程时，也可能会出现此错误。如果使用实体famework Context.Database.SqlQuery（），就会发生这种情况。您必须为表params设置TypeName属性。

SqlParameter codesParam = new SqlParameter(CODES_PARAM, SqlDbType.Structured);
            SqlParameter factoriesParam = new SqlParameter(FACTORIES_PARAM, SqlDbType.Structured);

            codesParam.Value = tbCodes;
            codesParam.TypeName = "[dbo].[MES_CodesType]";
            factoriesParam.Value = tbfactories;
            factoriesParam.TypeName = "[dbo].[MES_FactoriesType]";


            var list = _context.Database.SqlQuery<MESGoodsRemain>($"{SP_NAME} {CODES_PARAM}, {FACTORIES_PARAM}"
                , new SqlParameter[] {
                   codesParam,
                   factoriesParam
                }
                ).ToList();

System.ArgumentException：表类型参数必须具有有效的类型名称

3 个答案: