Question

I’ve got a table in my Google Cloud SQL database with an auto-incrementing column.

How do I execute an INSERT query via google-apps-script/JDBC and get back the value for the newly incremented column?

For example, my column is named ticket_id. I want to INSERT and have the new ticket_id value be returned in the result set.

In other words, if I have the following structure, what would I need to modify or how, so that I can do something like rs = stmt.getGeneratedKeys();

var conn = Jdbc.getCloudSqlConnection("jdbc:google:rdbms:.......  
var stmt = conn.createStatement();

//build my INSERT sql statement  
var sql = "insert into ......

var rs = stmt.executeUpdate(sql);

I see that there is a JDBC statement class with a member called RETURN_GENERATED_KEYS but I have so far not been smart enough to figure out how to properly manipulate that and get what I need. Is RETURN_GENERATED_KEYS a constant, is it an attribute, or how can I make use of it?

Answer 1

It seems like the documentation with the Apps Script JDBC service is a bit lacking. I’ve created an internal task item for that. Thankfully, Apps Script JDBC API follows the Java JDBC API pretty closely. The key is to get the result set back using the stmt.getGeneratedKeys() call.

I built a sample table using the animals example from the MySQL docs and this sample below works nicely against that and logs the next incremented ID.

function foo() {
  var conn = Jdbc.getCloudSqlConnection("jdbc:google:rdbms://<instance>/<db>");
  var stmt = conn.createStatement();
  var sql = "INSERT INTO animals (name) VALUES ('dog')";
  var count = stmt.executeUpdate(sql,1)//pass in any int for auto inc IDs back
  var rs = stmt.getGeneratedKeys();
  //if you are only expecting one row back, no need for while loop
  // just do rs.next();
  while(rs.next()) { 
    Logger.log(rs.getString(1));
  }
  rs.close();
  stmt.close();
  conn.close();
}