public static void main(String[] args) {
try {
Connection conn = DBHelper.getConnection();
if (conn == null) {
System.out.println("数据库连接失败。");
} else {
System.out.println("数据库连接成功！");
}
} catch (SQLException ex) {
ex.printStackTrace();
}
}
public Items getItemsById(int id) {
Connection conn = null;
PreparedStatement stmt = null;
ResultSet rs = null;
try {
conn = DBHelper.getConnection();
String sql = "select * from items where id =?;";
stmt = conn.prepareStatement(sql);
stmt.setInt(1, id);
rs = stmt.executeQuery();
while (rs.next()) {
Items item = new Items();
item.setId(rs.getInt("id"));
item.setName(rs.getString("name"));
item.setCity(rs.getString("city"));
item.setNumber(rs.getInt("number"));
item.setPrice(rs.getInt("price"));
item.setPicture(rs.getString("picture"));
return item;
}
} catch (SQLException ex) {
ex.printStackTrace();
} finally {
try {
stmt.close();
} catch (SQLException e) {
e.printStackTrace();
}
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
rs = null;
stmt = null;
}
return null;
}
// 获得所有的商品信息
public ArrayList<Items> getAllItems() {
Connection conn = null;
PreparedStatement stmt = null;
ResultSet rs = null;
ArrayList<Items> list = new ArrayList<Items>();
try {
conn = DBHelper.getConnection();
String sql = "select * from items";
stmt = conn.prepareStatement(sql);
rs = stmt.executeQuery();
while (rs.next()) {
Items item = new Items();
item.setId(rs.getInt("id"));
item.setName(rs.getString("name"));
item.setCity(rs.getString("city"));
item.setNumber(rs.getInt("number"));
item.setPrice(rs.getInt("price"));
item.setPicture(rs.getString("picture"));
list.add(item);
}
} catch (SQLException ex) {
ex.printStackTrace();
} finally {
try {
stmt.close();
} catch (SQLException e) {
e.printStackTrace();
}
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
rs = null;
stmt = null;
}
return list;
}