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@ -20,94 +20,94 @@ import net.sf.json.JSONObject;
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/**
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* Servlet implementation class ReturnTable
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*/
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@WebServlet("/manager/returnTable")
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public class ReturnTable extends HttpServlet {
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@WebServlet("/manager/returnTable") // 定义Servlet的URL映射
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public class ReturnTable extends HttpServlet { // 继承HttpServlet类
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@Override
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protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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resp.setContentType("application/json; charset=utf8");
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protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { // 重写doGet方法
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resp.setContentType("application/json; charset=utf8"); // 设置响应内容类型为JSON，编码为UTF-8
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// 接收参数
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String limit = req.getParameter("limit");
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String page = req.getParameter("page");
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String condition = (String) req.getParameter("condition");
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String conditionValue = (String) req.getParameter("conditionValue");
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String where = ""; // 无限制条件
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if (page == null) {
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page = "1";
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String limit = req.getParameter("limit"); // 获取请求中的limit参数
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String page = req.getParameter("page"); // 获取请求中的page参数
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String condition = (String) req.getParameter("condition"); // 获取请求中的condition参数
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String conditionValue = (String) req.getParameter("conditionValue"); // 获取请求中的conditionValue参数
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String where = ""; // 初始化where子句为空字符串
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if (page == null) { // 如果page参数为空
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page = "1"; // 默认设置为1
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}
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if (limit == null) {
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limit = "10";
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if (limit == null) { // 如果limit参数为空
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limit = "10"; // 默认设置为10
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}
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// 准备查询
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Connection connection = null;
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PreparedStatement pstmt = null;
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PreparedStatement countPstmt = null;
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ResultSet resultSet = null;
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ResultSet countSet = null;
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String sql = "";
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String countSql = "";
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Connection connection = null; // 数据库连接对象
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PreparedStatement pstmt = null; // 预编译SQL语句对象
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PreparedStatement countPstmt = null; // 用于计数的预编译SQL语句对象
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ResultSet resultSet = null; // 结果集对象
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ResultSet countSet = null; // 计数结果集对象
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String sql = ""; // SQL查询语句
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String countSql = ""; // 计数SQL查询语句
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// 准备返回参数
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int code = 1;
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String msg = "无数据";
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int count = 0;
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int code = 1; // 返回代码，默认为1表示失败
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String msg = "无数据"; // 返回消息，默认为"无数据"
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int count = 0; // 总记录数
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JSONObject jsonData = new JSONObject();
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JSONArray jsonArray = new JSONArray();
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JSONObject jsonResult = new JSONObject();
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JSONObject jsonData = new JSONObject(); // JSON对象，用于存储单条记录的数据
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JSONArray jsonArray = new JSONArray(); // JSON数组，用于存储所有记录的数据
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JSONObject jsonResult = new JSONObject(); // JSON对象，用于返回最终结果
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// 进行查询
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try {
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connection = (Connection) Base.getConnection();
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sql = "select * from borrow_books where manager_id is null";
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if (condition != null && conditionValue != null && !condition.equals("") && !conditionValue.equals("")) {
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where = " and " + condition + " like '%" + conditionValue + "%' ";
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sql += where;
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connection = (Connection) Base.getConnection(); // 获取数据库连接
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sql = "select * from borrow_books where manager_id is null"; // 基础查询语句
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if (condition != null && conditionValue != null && !condition.equals("") && !conditionValue.equals("")) { // 如果存在条件
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where = " and " + condition + " like '%" + conditionValue + "%' "; // 拼接where子句
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sql += where; // 将where子句添加到查询语句中
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}
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sql += " limit ?,?";// 1 10 (1-1)*10
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System.out.println("???" + sql);
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pstmt = connection.prepareStatement(sql);
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pstmt.setInt(1, (Integer.parseInt(page) - 1) * Integer.parseInt(limit));
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pstmt.setInt(2, Integer.parseInt(limit));
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resultSet = pstmt.executeQuery();
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while (resultSet.next()) {
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jsonData.put("id", resultSet.getString("id"));
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jsonData.put("card_id", resultSet.getString("card_id"));
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jsonData.put("book_id", resultSet.getString("book_id"));
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jsonData.put("borrow_date", resultSet.getString("borrow_date"));
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jsonData.put("end_date", resultSet.getString("end_date"));
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sql += " limit ?,?"; // 添加分页限制
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System.out.println("???" + sql); // 打印调试信息
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pstmt = connection.prepareStatement(sql); // 预编译SQL语句
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pstmt.setInt(1, (Integer.parseInt(page) - 1) * Integer.parseInt(limit)); // 设置第一个参数（偏移量）
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pstmt.setInt(2, Integer.parseInt(limit)); // 设置第二个参数（每页记录数）
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resultSet = pstmt.executeQuery(); // 执行查询
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while (resultSet.next()) { // 遍历结果集
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jsonData.put("id", resultSet.getString("id")); // 获取并存储id字段
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jsonData.put("card_id", resultSet.getString("card_id")); // 获取并存储card_id字段
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jsonData.put("book_id", resultSet.getString("book_id")); // 获取并存储book_id字段
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jsonData.put("borrow_date", resultSet.getString("borrow_date")); // 获取并存储borrow_date字段
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jsonData.put("end_date", resultSet.getString("end_date")); // 获取并存储end_date字段
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jsonArray.add(jsonData);
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jsonArray.add(jsonData); // 将当前记录添加到JSON数组中
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}
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countSql = "select count(*) as count from borrow_books where manager_id is null";
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countSql += where;
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countPstmt = connection.prepareStatement(countSql);
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countSet = countPstmt.executeQuery();
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if (countSet.next()) {
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count = countSet.getInt("count");
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countSql = "select count(*) as count from borrow_books where manager_id is null"; // 基础计数查询语句
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countSql += where; // 添加where子句到计数查询语句中
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countPstmt = connection.prepareStatement(countSql); // 预编译计数SQL语句
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countSet = countPstmt.executeQuery(); // 执行计数查询
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if (countSet.next()) { // 如果计数结果集有数据
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count = countSet.getInt("count"); // 获取总记录数
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}
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if (!jsonArray.isEmpty()) {
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code = 0;
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msg = "查询成功";
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if (!jsonArray.isEmpty()) { // 如果JSON数组不为空
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code = 0; // 设置返回代码为0表示成功
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msg = "查询成功"; // 设置返回消息为"查询成功"
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}
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} catch (ClassNotFoundException e) {
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msg = "class没找到";
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} catch (SQLException e) {
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msg = "sql错误";
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} catch (ClassNotFoundException e) { // 捕获类未找到异常
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msg = "class没找到"; // 设置错误消息
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} catch (SQLException e) { // 捕获SQL异常
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msg = "sql错误"; // 设置错误消息
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} finally {
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try {
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Base.closeResource(null, pstmt, resultSet);
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Base.closeResource(connection, countPstmt, countSet);
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} catch (SQLException e) {
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msg = "关闭资源失败";
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Base.closeResource(null, pstmt, resultSet); // 关闭资源
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Base.closeResource(connection, countPstmt, countSet); // 关闭资源
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} catch (SQLException e) { // 捕获SQL异常
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msg = "关闭资源失败"; // 设置错误消息
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}
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}
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// 返回数据
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jsonResult.put("code", code);
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jsonResult.put("count", count);
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jsonResult.put("msg", msg);
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jsonResult.put("data", jsonArray.toArray());
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PrintWriter out = resp.getWriter();
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out.print(jsonResult.toString());
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jsonResult.put("code", code); // 将返回代码添加到JSON结果中
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jsonResult.put("count", count); // 将总记录数添加到JSON结果中
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jsonResult.put("msg", msg); // 将返回消息添加到JSON结果中
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jsonResult.put("data", jsonArray.toArray()); // 将数据添加到JSON结果中
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PrintWriter out = resp.getWriter(); // 获取输出流
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out.print(jsonResult.toString()); // 输出JSON结果
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}
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/**
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