java数据库操作 java数据库连接、查询、更新等

nameGet='%'+nameGet+'%'; 
String sqlGname = "SELECT * FROM GOODS WHERE GNAME LIKE ?"; 
try 
{ 
  pstmt = conn.prepareStatement(sqlGname); 
  pstmt.setString(1, nameGet); 
  rs = pstmt.executeQuery(); 
  while (rs.next()) 
  { 
    int gid = rs.getInt("gid"); 
    String gname = rs.getString(2); 
    double gprice = rs.getDouble(3); 
    int gnum = rs.getInt(4); 
    Goods goods = new Goods(gid,gname,gprice,gnum); 
    goodsList.add(goods); 
    } 
  } catch (SQLException e) 
  { 
    e.printStackTrace(); 
  }finally 
  { 
    DbClose.queryClose(pstmt, rs, conn); 
  } 

public final class DbConn 
{ 
  public static Connection getconn() 
  { 
    Connection conn = null; 
     
    String user  = "root"; 
    String passwd = "root"; 
    String url = "jdbc:mysql://localhost:3306/shop"; 
     
    //已加载完驱动 
    try 
    { 
      Class.forName("com.mysql.jdbc.Driver");  
      conn = DriverManager.getConnection(url,user,passwd); 
    }catch (SQLException e) 
    { 
      e.printStackTrace(); 
    } 
    catch (ClassNotFoundException e) 
    { 
      e.printStackTrace(); 
    } 
    return conn; 
  } 
 
}