使用Parameters从DbCommand获取SQL查询字符串

Question

就在C#中对MySQL数据库执行SQL查询之前,我想记录将要执行的查询.我现在所拥有的只是记录SELECT * FROM foo WHERE Id = @Id我希望看到的地方SELECT * FROM foo WHERE Id = 5.我怎么做？

    DbCommand dbCommand = dbFactory.CreateCommand();
    dbCommand.CommandText = "SELECT * FROM foo WHERE Id = @Id";

    DbParameter param = dbCommand.CreateParameter();
    param.ParameterName = "@Id";
    param.Value = 5;

    dbCommand.Parameters.Add(param);

    dbConnection.Open();
    Log.AddVerbose(String.Format("SQL query: {0}", dbCommand.CommandText));
    dbCommand.ExecuteReader();

Answer 1

如果您尝试登录,则可以执行此类扩展方法.

public static string GetGeneratedQuery(this SqlCommand dbCommand)
{
    var query = dbCommand.CommandText;
    foreach (var parameter in dbCommand.Parameters)
    {
            query = query.Replace(parameter.ParameterName, parameter.Value.ToString());
    }

    return query;
}

你可以像这样使用它.

Log.AddVerbose(String.Format("SQL query: {0}", GetGeneratedQuery(dbCommand)));