基于Android的驾照（驾校）考试系统的设计与实现

系统使用uni-app实现，会简单的HTML和PHP基础知识即可看懂：
代码：

public class DBHelper {private ConnDB db = null;// 声明连接对象private Connection conn = null;// 获取连接private PreparedStatement state = null;/*** 插入数据到表* * @param sql*/public boolean insertSql(String sql) {try {db = new ConnDB();// 声明连接对象conn = db.getConn();state = conn.prepareStatement(sql);if (state.executeUpdate() == 1) {// 返回影响的行数,返回为0表示没有插入成功// System.out.println("注册成功了");return true;}} catch (SQLException e) {e.printStackTrace();return false;}return false;}/*** 查询数据库中的信息* * @param sql* @return*/public ResultSet querySql(String sql) {try {db = new ConnDB();// 声明连接对象conn = db.getConn();state = conn.prepareStatement(sql);return state.executeQuery();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}return null;}/*** 数据库的更新操作* * @param sql* @return*/public boolean updateSql(String sql) {try {db = new ConnDB();// 声明连接对象conn = db.getConn();state = conn.prepareStatement(sql);int afact = state.executeUpdate();if (afact >= 1) {return true;}} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();return false;}return false;}/*** 根据sql语句 获取到有多少个符合条件的对象* * @param sql* @return*/public int getCountSql(String sql) {try {db = new ConnDB();// 声明连接对象conn = db.getConn();state = conn.prepareStatement(sql);ResultSet result = state.executeQuery();result.next();return result.getInt(1);} catch (SQLException e) {e.printStackTrace();}return -1;}