如何在C＃Windows窗体中使用LAST_INSERT_ID（）？

Question

In database I have three tables-

patient(patientID,fName,lName) 
illness(diseaseID,diseaseName)
patientDisease(patientID, diseaseID, dateChecked)

patientID and diseaseID are index. So on in c# I have three textboxes fNameTxt and lNameTXT , diseaseTxt .I want to store the name in patient table and disease name in illness table. Besides, I have to record patientID and diseaseID in patientDisease table as well. For patient table, I used following code. I knew, I can use

SET @variable = LAST_INSERT_ID()

to get the id, but realised c#(visual studio) doesnt recognize it. Basically, I couldnt make the overall statement. Could anybody help me to get through this condition please.

string connStr = @"server=localhost; DATABASE=mario;User ID=root;Password=;";
MySqlConnection conn1 = new MySqlConnection();
conn1.ConnectionString = connStr;

MySqlCommand cmd = conn1.CreateCommand();

cmd.CommandText = "INSERT INTO patient(patientID,fName, lName)" 
    + "Values("NULL",'" + fNameTxt.Text + "','" + lNameTxt.Text + "');";
conn1.Open();
cmd.ExecuteNonQuery();

I searched some other questions here, but they are almost about suggesting the use of LAST_INSERT_ID() but not how to use it.

Answer 1

You can use this to get the last inserted id:

"SELECT * FROMtable(column) WHERE id = last_insert_id();

And use this if you want to insert a last id:

"INSERT INTO table(column) VALUES (LAST_INSERT_ID())";

Hope this might be useful.

Answer 2

It will be much better if you use stored procedures

     INSERT INTO patient (patientID,patientID,lName)
            VALUES("NULL",'" + fNameTxt.Text + "','" + lNameTxt.Text + "');
   SET @last_id_in_patient  = LAST_INSERT_ID();        
     INSERT INTO patientDisease (patientID,diseaseID,dateChecked)
            VALUES( @last_id_in_patient ,NULL,'text');  # use ID in second table";

Now You can update your PatientDisease table for particular PatientId.