Question

使用dapper将参数附加到MySql查询时遇到问题。现在这可能是一个愚蠢的问题，但是我现在已经在这个问题上打了两个小时，但现在仍然无法正常工作。

我的问题是中间的SelectWithParametersTest（）函数。这就是我所拥有的......

编辑：更多细节。实际的Mysql服务器抛出适合并说，“ERROR [07001] [MySQL] [ODBC 3.51驱动程序] [mysqld-5.1.61-0ubuntu0.11.10.1-log] SQLBindParameter不用于所有参数”。

在QueryInternal <T＆gt;（...）执行读取器的行上捕获实际异常。（使用（var reader = cmd.ExecuteReader（））

当我检查命令时，没有附加任何参数，但是param对象（传递给函数）中有我的anon对象。

using System;
using System.Data;
using System.Collections.Generic;
using Dapper;

class Program
{
    static void Main(string[] args)
    {
        using (var dapperExample = new DapperExample())
        {
            //dapperExample.SelectTest();
            dapperExample.SelectWithParametersTest();
        }
    }
}

class DapperExample : IDisposable
{
    #region Fields
    IDbConnection _databaseConnection;
    #endregion

    #region Constructor / Destructor
    public DapperExample()
    {
        _databaseConnection = new System.Data.Odbc.OdbcConnection("DSN=MySqlServer;");
        _databaseConnection.Open();
    }

    public void Dispose()
    {
        if (_databaseConnection != null)
            _databaseConnection.Dispose();
    }
    #endregion

    #region Public Methods (Tests)
    public void SelectTest()
    {
        // This function correctly grabs and prints data.
        string normalSQL = @"SELECT County as CountyNo, CompanyName, Address1, Address2
                             FROM testdb.business
                             WHERE CountyNo = 50 LIMIT 3";

        var result = _databaseConnection.Query<ModelCitizen>(normalSQL);
        this.PrintCitizens(result);
    }

    public void SelectWithParametersTest()
    {
        // This function throws OdbcException: "ERROR [07001] [MySQL][ODBC 3.51 Driver][mysqld-5.1.61-0ubuntu0.11.10.1-log]SQLBindParameter not used for all parameters"
        string parameterizedSQL = @"SELECT County as CountyNo, CompanyName, Address1, Address2
                                    FROM testdb.business
                                    WHERE CountyNo = ?B";
        var result = _databaseConnection.Query<ModelCitizen>(parameterizedSQL, new { B = 50 });
        this.PrintCitizens(result);
    }
    #endregion

    #region Private Methods
    private void PrintCitizens(IEnumerable<ModelCitizen> citizenCollection)
    {
        foreach (var mc in citizenCollection)
        {
            Console.WriteLine("--------");
            Console.WriteLine(mc.BankNo.ToString() + " - " + mc.CompNo.ToString());
            Console.WriteLine(mc.CompanyName);
            Console.WriteLine(mc.Address1);
            Console.WriteLine(mc.Address2);
        }
        Console.ReadKey();
    }
    #endregion
}

public class ModelCitizen
{
    public long CountyNo { get; set; }
    public string CompanyName { get; set; }
    public string Address1 { get; set; }
    public string Address2 { get; set; }
}

Answer 1

Yokin，您是否尝试在C＃代码中使用UInt32而不是长？

使用dapper通过MySql附加参数

1 个答案: