mysql - timeout expired 从池中获取连接之前经过的超时时间

Question

今天我发现一个问题，我的程序在进行 SQL 查询时冻结，并且我得到一个异常“超时已过期，在从池中获取连接之前经过的超时时间”

我的C#请求代码：

public int LoadParameter(string parameter,string table,string condition,string find)
{
    

        int index = 0;
        SqlConnection dbConnection = new SqlConnection
        {
            ConnectionString = ConfigurationManager.ConnectionStrings["Connection"].ToString()
        };
    try
    {
        dbConnection.Open();
        SqlCommand command = new SqlCommand
        {
            CommandText = string.Format(@"Select {0} FROM {1} WHERE {2} = '{3}'", parameter, table, condition, find),
            Connection = dbConnection
        };
        SqlDataReader reader = command.ExecuteReader();
        while (reader.Read())
        {
            index = reader.GetInt32(0);
        }
        dbConnection.Close();
        SqlConnection.ClearPool(dbConnection);
        return index;
        
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
        return 0;
    }
    finally
    {
        dbConnection.Close();
        SqlConnection.ClearPool(dbConnection);
    }
}

我关闭了连接，但没有帮助。