Get last insert id with Oracle 11g using JDBC

问题:

I'm new to using Oracle so I'm going off what has already been previously answered in this SO question. I just can't seem to get it to work. Here's the statement that I'm using:

declare
  lastId number;
begin
INSERT INTO "DB_OWNER"."FOO" 
  (ID, DEPARTMENT, BUSINESS)
  VALUES (FOO_ID_SEQ.NEXTVAL, 'Database Management', 'Oracle')
  RETURNING ID INTO lastId;
end;

When I call executeQuery the PreparedStatement that I have made, it inserts everything into the database just fine. However, I cannot seem to figure out how to retrieve the ID. The returned ResultSet object will not work for me. Calling

if(resultSet.next()) ...

yields a nasty SQLException that reads:

Cannot perform fetch on a PLSQL statement: next

How do I get that lastId? Obviously I'm doing it wrong.

回答1:

make it a function that returns it to you (instead of a procedure). Or, have a procedure with an OUT parameter.

回答2:

Not sure if this will work, since I've purged all of my computers of anything Oracle, but...

Change your declare to:

declare
  lastId OUT number;

Switch your statement from a PreparedStatement to a CallableStatement by using prepareCall() on your connection. Then register the output parameter before your call, and read it after the update:

cstmt.registerOutParameter(1, java.sql.Types.NUMERIC);
cstmt.executeUpdate();
int x = cstmt.getInt(1);

回答3:

I tried with Oracle driver v11.2.0.3.0 (since there are some bugs in 10.x and 11.1.x, see other blog). Following code works fine:

final String sql = "insert into TABLE(SOME_COL, OTHER_COL) values (?, ?)";
PreparedStatement ps = con.prepareStatement(sql, new String[] {"ID"});
ps.setLong(1, 264);
ps.setLong(2, 1);
int executeUpdate = ps.executeUpdate();
ResultSet rs = ps.getGeneratedKeys();
if (rs.next() ) {
    // The generated id
    long id = rs.getLong(1);
    System.out.println("executeUpdate: " + executeUpdate + ", id: " + id);
}

回答4:

When you prepare the statement set the second parameter to RETURN_GENERATED_KEYS. Then you should be able to get a ResultSet off the statement object.

回答5:

You can use Statement.getGeneratedKeys() to do this. You just need to make sure to tell JDBC what columns you want back using one of the method overloads for that, such as the Connection.prepareStatement overload here:

Connection conn = ...
PreparedStatement pS = conn.prepareStatement(sql, new String[]{"id"});
pS.executeUpdate();
ResultSet rS = pS.getGeneratedKeys();
if (rS.next()) {
  long id = rS.getLong("id");
  ...
}

You don't need to do the RETURNING x INTO stuff with this, just use the basic SQL statement you want.

回答6:

Are you doing that in a stored procedure ? According to this Oracle document, it won't work with the server-side driver.

The Oracle server-side internal driver does not support 
the retrieval of auto-generated keys feature.