删除手写JDBC部分代码
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myh
@@ -1,16 +0,0 @@
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package com.example.springdemo.dao.InterfaceDao;
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import java.util.List;
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public interface AbstractDao<T> {
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int insert(T t); //增
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int delete(T t);//删
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int update(T t);//改
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List<T> search(T t);//查
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T searchID(Long id);//查 ByID
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}
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@@ -1,7 +0,0 @@
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package com.example.springdemo.dao.InterfaceDao;
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import com.example.springdemo.dao.InterfaceDao.AbstractDao;
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import com.example.springdemo.entities.Users;
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public interface UsersDao extends AbstractDao<Users> {
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}
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@@ -1,28 +0,0 @@
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package com.example.springdemo.dao.impl;
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import com.example.springdemo.utils.DataBaseUtil;
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import java.sql.Connection;
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import java.sql.PreparedStatement;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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public class CommonDao {
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DataBaseUtil dataBaseUtil = new DataBaseUtil();
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public int delete(Connection ct, PreparedStatement ps, ResultSet rs,
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String sql, Long id) {
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int flag;
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try {
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ct = dataBaseUtil.getConnection();
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// FIXME: 未对传入sql语句检测，可能有sql注入攻击
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ps = ct.prepareStatement(sql);
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ps.setLong(1, id);
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flag = ps.executeUpdate();
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} catch (SQLException e) {
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throw new RuntimeException(e);
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} finally {
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dataBaseUtil.close(ct, ps, rs);
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}
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return flag;
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}
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}
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@@ -1,138 +0,0 @@
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package com.example.springdemo.dao.impl;
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import com.example.springdemo.dao.InterfaceDao.UsersDao;
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import com.example.springdemo.entities.Users;
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import com.example.springdemo.utils.DataBaseUtil;
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import org.jetbrains.annotations.NotNull;
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import org.springframework.stereotype.Component;
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import java.sql.Connection;
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import java.sql.PreparedStatement;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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import java.util.ArrayList;
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import java.util.List;
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@Component
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public class UsersDaoImpl implements UsersDao {
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private Connection connection = null;
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private PreparedStatement preparedStatement = null;
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private ResultSet resultSet = null;
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DataBaseUtil dataBaseUtil = new DataBaseUtil();
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//新建用户
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@Override
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public int insert(@NotNull Users users) {
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int flag;
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try {
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connection = dataBaseUtil.getConnection();
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String insert_sql = "insert into Users(name, phoneNumber, address, password) " + "values (?,?,?,?)";
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preparedStatement = connection.prepareStatement(insert_sql);
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preparedStatement.setString(1, users.getName());
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preparedStatement.setString(2, users.getPhoneNumber());
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preparedStatement.setString(3, users.getAddress());
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preparedStatement.setString(4, users.getPassword());
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flag = preparedStatement.executeUpdate();
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} catch (SQLException e) {
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throw new RuntimeException(e);
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} finally {
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dataBaseUtil.close(connection, preparedStatement, resultSet);
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}
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return flag;
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}
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//删除
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@Override
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public int delete(@NotNull Users user) {
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String delete_sql = "delete from Users where id=?";
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CommonDao dao = new CommonDao();
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return dao.delete(connection, preparedStatement, resultSet,
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delete_sql, user.getId());
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}
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//更新用户个人信息
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//@TODO 只能更新所有信息，不能选择性更新
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@Override
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public int update(@NotNull Users users) {
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int flag;
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String update_sql = "update Users " + "set name = ?, phoneNumber = ?, address = ? " + "where id = ?";
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try {
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connection = dataBaseUtil.getConnection();
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preparedStatement = connection.prepareStatement(update_sql);
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preparedStatement.setString(1, users.getName());
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preparedStatement.setString(2, users.getPhoneNumber());
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preparedStatement.setString(3, users.getAddress());
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preparedStatement.setLong(4, users.getId());
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flag = preparedStatement.executeUpdate();
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} catch (SQLException e) {
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throw new RuntimeException(e);
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}
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return flag;
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}
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//查询所有用户
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@Override
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public @NotNull List<Users> search(@NotNull Users user) {
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List<Users> list = new ArrayList<>();
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String selectAll_sql = "select * from Users";
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try {
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connection = dataBaseUtil.getConnection();
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preparedStatement = connection.prepareStatement(selectAll_sql);
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resultSet = preparedStatement.executeQuery();
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while (resultSet.next()) {
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user = new Users();
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SetAttribute(user, resultSet);
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list.add(user);
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}
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} catch (SQLException e) {
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throw new RuntimeException(e);
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} finally {
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dataBaseUtil.close(connection, preparedStatement, resultSet);
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}
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return list;
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}
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//用ID查询用户
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@Override
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public @NotNull Users searchID(@NotNull Long id) {
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Users user = null;
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String selectID_sql = "select * from Users where id = ?";
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try {
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connection = dataBaseUtil.getConnection();
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preparedStatement = connection.prepareStatement(selectID_sql);
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preparedStatement.setLong(1, id);
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resultSet = preparedStatement.executeQuery();
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while (resultSet.next()) {
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user = new Users();
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SetAttribute(user, resultSet);
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}
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} catch (SQLException e) {
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throw new RuntimeException(e);
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} finally {
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dataBaseUtil.close(connection, preparedStatement, resultSet);
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}
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if (user == null) {
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throw new RuntimeException("用户不存在");
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} else {
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return user;
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}
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}
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private void SetAttribute(@NotNull Users user, @NotNull ResultSet rs) throws SQLException {
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user.setId(rs.getLong("id"));
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user.setName(rs.getString("name"));
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user.setPhoneNumber(rs.getString("phoneNumber"));
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user.setAddress(rs.getString("address"));
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}
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}
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