How Can I Get Value From One Table And Use It In Another

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i have three table table teacher ,publication_app, and publication.
i have to use the id of teacher in publication_app then id of publication app into publication. and also i have to run the 4 quries at the same time.

C#

public void Addpublication(string Author, string designations ,string status_of_authoship, string faculty, string d,string id )
       {
           string q = "insert into Teacher (TName, Designation,Status_of_authorship, Department, dateAdded)values('" + Author + "', '" + designations + "','" + status_of_authoship + "','" + faculty + "','" + d + "')";
           cmd = new OleDbCommand(q, con);
           cmd.CommandText = q;
           cmd.Connection = con;
           con.Open();

         string   q2 =  "select Max(TID), from Teacher where Tname='Author' by DESC ORDER";
         cmd = new OleDbCommand(q2, con);
         cmd.CommandText = q2;
         cmd.Connection = con;

i have select id from one table and i dont know how to use it in another table plx tell me procedure using 4 quries on single click and usage of select value into another table

Posted 14-Sep-15 20:42pm

Member 11973254

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Richard MacCutchan 15-Sep-15 4:13am

The first thing you need to do is learn how to use proper parameterised queries in SQL. Your code is wide open to SQL injection, hacking and loss of your data.

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vagelis1 · Answer 1 · 2015-09-18T03:37:00

You can write multiple SQL statements in one query so you can use the previous value of the same query to the next.
e.g.

C#

q ="DELCARE @teacherid int, @publicationid int; 
SET @teacherid  = SELECT id from teachertable;
SET @publicationid = SELECT id from publicationstable where teacherid = @teacherid;
INSERT INTO sometable (blah, blah) VALUES(@teacherid, @publicationid )";

execute query q and you are done. All in one statement