c# - MySQL ODBC 存储过程结果缺少列

Question

我有一组用于填充 ASP.Net CheckBoxList 的存储过程。从代码运行此过程时 { CALL ProcedureName(params); } 将类型设置为存储过程，我似乎只得到了部分结果(即实际结果中的许多列都丢失了。)

如果我从查询中复制 CommandText(使用断点来获取发送的确切文本)并直接在 Navicat(或任何其他 MySQL GUI)中运行它，我会得到所有预期的列。

这是不起作用的代码:

using (OdbcCommand command = OdbcConnection.CreateCommand())
{
    command.CommandType = CommandType.StoredProcedure;
    command.CommandText = "{ " + string.Format(StoredProcedureCall, foundationId, fpids, "", "", "NULL", "2001/01/02", "2001/01/01", "*") +
                          " }";
    using (OdbcDataReader reader = command.ExecuteReader())
    {

        for (int i = 0; i < reader.FieldCount; i++)
        {
            columns.Add(reader.GetName(i));
        }
    }
}

如果我将代码更改为以下但它开始工作(仅添加其他使用):

using (OdbcConnection)
using (OdbcCommand command = OdbcConnection.CreateCommand())
{
    command.CommandType = CommandType.StoredProcedure;
    command.CommandText = "{ " + string.Format(StoredProcedureCall, foundationId, fpids, "", "", "NULL", "2001/01/02", "2001/01/01", "*") +
                          " }";
    using (OdbcDataReader reader = command.ExecuteReader())
    {

        for (int i = 0; i < reader.FieldCount; i++)
        {
            columns.Add(reader.GetName(i));
        }
    }
}

这是怎么回事？

此处供引用的是 OdbcConnection 属性:

public static OdbcConnection OdbcConnection
{
    get
    {
        // If we have no connection or our connection isn't open
        if (null == odbcConnection || ConnectionState.Open != odbcConnection.State)
        {
            odbcConnection = new OdbcConnection(BaseAccess.DBConnectionString);
            odbcConnection.Open();
        }

        return odbcConnection;
    }
}

Answer 1

这可能是 Odbc MySql 驱动程序中的错误。尝试使用 ADO.NET driver .另外，我建议您不要在静态属性中手动处理连接。将此任务留给 ADO.NET，它将有效地处理连接池:

using (var conn = new MySqlConnection(DBConnectionString))
using (var cmd = conn.CreateCommand())
{
    conn.Open();
    cmd.CommandType = CommandType.StoredProcedure;
    cmd.CommandText = "sp_name";

    cmd.Parameters.Add(new SqlParameter("@foundationId", foundationId));
    cmd.Parameters.Add(new SqlParameter("@fpids", fpids));
    ...

    using (var reader = cmd.ExecuteReader())
    {
        for (int i = 0; i < reader.FieldCount; i++)
        {
            columns.Add(reader.GetName(i));
        }
    }
}