How can I call other database's stored procedure in method

Question

When I first connect to MySQL, used dbname is DataBase1 (main DB)

Sometimes, I need to call other stored procedure named 'usp_select_query' which exists in DataBase2 (sub DB)

DataBase1,2 exist on the same server, same account.

In console, this is executed well.

call DataBase2.use_select_query; in DataBase1 // ok

 c# code
 DataSet ds = DbHelper.CallUSP("usp_select_query", para);  // of course error

 DataSet ds = DbHelper.CallUSP("DataBse2.usp_select_query", para);  //  error

 DataSet ds = DbHelper.CallUSP("`DataBse2`.`usp_select_query`", para);  //  error
 
  error Message :Procedure or function '``**DataBase2**`.`usp_select_query``' cannot be found in database '`**DataBase1**`'

public static DataSet CallUSP(string usp, params MySqlParameter[] parameters)
        {
            try
            {
                string query = usp;      
                if(conn.State!= ConnectionState.Open)
                conn.Open();                
                MySqlCommand com= conn.CreateCommand();
                com.CommandType = CommandType.StoredProcedure;
                com.CommandText = query;                
                if(parameters!=null)
                    com.Parameters.AddRange(parameters);
                MySqlDataAdapter adapter = new MySqlDataAdapter(com);
                DataSet ds = new DataSet();
                adapter.Fill(ds);
                conn.Close();
                adapter.Dispose();
                com.Dispose();       
                return ds;       
            }
            catch(Exception ex)
            {
                conn.Close();
                LogE(MKSession.COMPANYINDEX,usp,ex.Message);                
            }
            conn.Close();
            return null;
        }

How can I do it?

Answer 1

If you're using MySQL Connector/NET (aka MySql.Data ), this is a known bug in the latest version: https://bugs.mysql.com/bug.php?id=100391

You can work around it by switching to MySqlConnector instead, which has a similar API but fixes this and other bugs .

Answer 2

I'm just modify my method. it is may not efficency. but It is work for me.

 public static DataSet CallUSP(string usp, params MySqlParameter[] parameters)
        {
            try
            {
                //add variable for dbname,usp
                string mdbName = "";
                string oldDbName = conn.Database;
                string[] lines = usp.Split(new string[] { "." }, StringSplitOptions.None);


                //set the value
                if (lines.Length > 1)
                {
                    mdbName = lines[0];
                    usp = lines[1];
                }

                string query = usp;      
                if(conn.State!= ConnectionState.Open)
                conn.Open();

               //change database
               if (mdbName != "")
                    conn.ChangeDatabase(mdbName);


                MySqlCommand com= conn.CreateCommand();
                com.CommandType = CommandType.StoredProcedure;
                com.CommandText = usp;
                if(parameters!=null)
                    com.Parameters.AddRange(parameters);
                MySqlDataAdapter adapter = new MySqlDataAdapter(com);
                DataSet ds = new DataSet();
                adapter.Fill(ds);     
                
                //reset orgin databse 
                if (mdbName != "")
                    conn.ChangeDatabase(oldDbName);
                
                conn.Close();
                adapter.Dispose();
                com.Dispose();
               return ds;       
            }
            catch(Exception ex)
            {
                conn.Close();
                LogE(MKSession.COMPANYINDEX,usp,ex.Message);                
            }
            conn.Close();
            return null;
        }