JAVA向数据库插入数据返回ID值的方法
java.sql.Statement 返回键获取：
1.使用JDBC 3.0提供的 getGeneratedKeys (推荐使用)

Statement stmt = conn.createStatement();stmt.executeQuery("INSERT INTO table_name(...) values(...)",Statement.RETURN_GENERATED_KEYS);ResultSet rs = stmt.getGeneratedKeys();if(rs.next()){this.setId(rs.getInt(1));}

Statement stmt = conn.createStatement();stmt.executeQuery("INSERT INTO table_name(...) values(...)",Statement.RETURN_GENERATED_KEYS);ResultSet rs = stmt.executeQuery("SELECT LAST_INSERT_ID()");if(rs.next()){      this.setId(rs.getInt(1));}