// 关闭数据库
public void closeAll() {
try {
if (rs != null) {
rs.close();
rs = null;
}
if (ps != null) {
ps.close();
ps = null;
}
if (conn != null) {
conn.close();
conn = null;
}
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
