注释代码

TeamInfoDal.java

@@ -0,0 +1,150 @@
+package cn.fly.jdbc;
+
+import cn.fly.entity.TeamInfo;
+
+import java.io.IOException;
+import java.sql.*;
+import java.util.*;
+
+public class TeamInfoDal {
+    // 数据库连接字符串和相关属性
+    private static final String DB_URL = "jdbc:mysql://localhost:3306/DBTeam";
+    private static final String USER = "root";
+    private static final String PASS = "20030815";
+
+    // JDBC驱动名
+    private static final String DRIVER = "com.mysql.cj.jdbc.Driver";
+
+    // Connection对象
+    private Connection conn;
+
+    public static void main(String[] args) throws IOException {
+        try {
+            // 加载JDBC驱动
+            Class.forName("com.mysql.cj.jdbc.Driver");
+            // 建立数据库连接
+            Connection conn = DriverManager.getConnection(DB_URL, USER, PASS);
+            System.out.println("连接成功");
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    // 构造函数
+    public TeamInfoDal() {
+        try {
+            // 加载JDBC驱动
+            Class.forName("com.mysql.cj.jdbc.Driver");
+            // 建立数据库连接
+            conn = DriverManager.getConnection(DB_URL, USER, PASS);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    // 添加报名信息
+    public boolean addTeamInfo(TeamInfo teamInfo) {
+        String sql = "INSERT INTO TeamInfo (id, sno, name, sex, tel) VALUES (?, ?, ?, ?, ?)";
+        try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+            stmt.setString(1, teamInfo.getId());
+            stmt.setString(2, teamInfo.getSno());
+            stmt.setString(3, teamInfo.getName());
+            stmt.setString(4, teamInfo.getSex());
+            stmt.setString(5, teamInfo.getTel());
+            // 执行插入操作并返回结果
+            int rowsAffected = stmt.executeUpdate();
+            return rowsAffected > 0;
+        } catch (SQLException e) {
+            e.printStackTrace();
+            return false;
+        }
+    }
+
+    // 修改报名信息
+    public boolean updateTeamInfo(TeamInfo teamInfo) {
+        String sql = "UPDATE TeamInfo SET sno=?, name=?, sex=?, tel=? WHERE id=?";
+        try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+            stmt.setString(1, teamInfo.getSno());
+            stmt.setString(2, teamInfo.getName());
+            stmt.setString(3, teamInfo.getSex());
+            stmt.setString(4, teamInfo.getTel());
+            stmt.setString(5, teamInfo.getId());
+            int rowsAffected = stmt.executeUpdate();
+            return rowsAffected > 0;
+        } catch (SQLException e) {
+            e.printStackTrace();
+            return false;
+        }
+    }
+
+    // 删除报名信息
+    public boolean deleteTeamInfo(String id) {
+        String sql = "DELETE FROM TeamInfo WHERE id=?";
+        try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+            stmt.setString(1, id);
+            int rowsAffected = stmt.executeUpdate();
+            return rowsAffected > 0;
+        } catch (SQLException e) {
+            e.printStackTrace();
+            return false;
+        }
+    }
+
+    // 根据id查询某条信息
+    public TeamInfo getTeamInfoById(String id) {
+        String sql = "SELECT * FROM TeamInfo WHERE id=?";
+        TeamInfo teamInfo = null;
+        try (PreparedStatement stmt = conn.prepareStatement(sql)) {
+            stmt.setString(1, id);
+            ResultSet rs = stmt.executeQuery();
+            if (rs.next()) {
+                teamInfo = new TeamInfo();
+                teamInfo.setId(rs.getString("id"));
+                teamInfo.setSno(rs.getString("sno"));
+                teamInfo.setName(rs.getString("name"));
+                teamInfo.setSex(rs.getString("sex"));
+                teamInfo.setTel(rs.getString("tel"));
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+        return teamInfo;
+    }
+
+    // 查询所有数据
+    public List<TeamInfo> getAllTeamInfos() {
+        String sql = "SELECT * FROM TeamInfo";
+        List<TeamInfo> list = new ArrayList<>();
+        try (Statement stmt = conn.createStatement()) {
+            ResultSet rs = stmt.executeQuery(sql);
+            while (rs.next()) {
+                TeamInfo teamInfo = new TeamInfo();
+                teamInfo.setId(rs.getString("id"));
+                teamInfo.setSno(rs.getString("sno"));
+                teamInfo.setName(rs.getString("name"));
+                teamInfo.setSex(rs.getString("sex"));
+                teamInfo.setTel(rs.getString("tel"));
+                list.add(teamInfo);
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+
+        for (TeamInfo teamInfo : list) {
+            System.out.println(teamInfo.toString());
+        }
+
+        return list;
+    }
+
+    // 关闭数据库连接
+    public void close() {
+        try {
+            if (conn != null && !conn.isClosed()) {
+                conn.close();
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+    }
+}