UserDAO以及MerchantsDAO抽象接口的实现，ShellUI的部分功能

README.md

@@ -1,12 +1,12 @@
 # Homework-entities
 *网安实训作业*
 
-# 20230316
+# 2023-03-16
 - 初始化项目
-# 20230322
+# 2023-03-22
 - 增加实体类
 - 删除.idea文件
-# 20230326
+# 2023-03-26
 - 完善实体类
 - 我靠，折腾了一晚上，提交了十几次，终于提交时把.idea这个文件给忽略了
   - 方法：在`.gitgnore`文件中添加
@@ -19,7 +19,20 @@
   - `update`一下远端项目
   - `push`代码
 - 我好菜。。。
-# 20230327
+# 2023-03-27
 - 完善了一下实体类，发现商家那一部分漏了一点东西，给它补上了
 - 另外就是为什么`.idea`文件我已经取消提交了，为啥本地的`commit`里面还会有有啊……无语了
 - 是不是跟`git`八字不合。。。
+# 2023-03-29
+- 添加`JDBC`驱动，连接数据库
+# 2023-05-04
+- 创建数据库表，并成功连接
+- 调整实体类与数据库对应的结构，修改外键
+- 调整项目结构
+- 完成DAO层抽象接口
+- 完成MerchantsDAO和UserDAO具体功能
+# 2023-05-05
+- Debug MerchantsDAO 按ID查询功能
+- 搭建shellUI的大体框架
+- 完成UserDAO具体功能
+- 第一次测试

pom.xml

@@ -3,7 +3,7 @@
     <modelVersion>4.0.0</modelVersion>
 
     <groupId>org.example</groupId>
-  <artifactId>JavaEle</artifactId>
+    <artifactId>JavaElm</artifactId>
     <version>1.0-SNAPSHOT</version>
     <packaging>jar</packaging>
 
@@ -12,9 +12,9 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <maven.compiler.source>17</maven.compiler.source>
-    <maven.compiler.target>17</maven.compiler.target>
-    <java.version>17</java.version>
+        <maven.compiler.source>17.0.6</maven.compiler.source>
+        <maven.compiler.target>17.0.6</maven.compiler.target>
+        <java.version>17.0.6</java.version>
     </properties>
 
     <dependencies>
@@ -32,5 +32,16 @@
             <version>1.18.26</version>
         </dependency>
 
+        <dependency>
+            <groupId>com.microsoft.sqlserver</groupId>
+            <artifactId>mssql-jdbc</artifactId>
+            <version>12.2.0.jre11</version>
+        </dependency>
+        <dependency>
+            <groupId>org.jetbrains</groupId>
+            <artifactId>annotations</artifactId>
+            <version>20.1.0</version>
+            <scope>compile</scope>
+        </dependency>
     </dependencies>
 </project>

src/main/java/dao/IndentAbstractDAO.java

@@ -0,0 +1,4 @@
+package dao;
+
+public interface IndentAbstractDAO {
+}

src/main/java/dao/abstractDAO.java

@@ -0,0 +1,13 @@
+package dao;
+
+import java.util.List;
+
+public interface abstractDAO<T> {
+    int insert(T t); //增
+
+    int delete(T t);//删
+
+    int update(T t);//改
+
+    List<T> search(T t);//查
+}

src/main/java/dao/indentItemAbstractDAO.java

@@ -0,0 +1,7 @@
+package dao;
+
+import entities.indentItem;
+
+public interface indentItemAbstractDAO extends abstractDAO<indentItem> {
+
+}

src/main/java/dao/merchantsAbstractDAO.java

@@ -0,0 +1,8 @@
+package dao;
+
+import entities.Merchants;
+
+public interface merchantsAbstractDAO extends abstractDAO<Merchants> {
+    //根据id查询商家
+    Merchants searchMerchantByID(Long id);
+}

src/main/java/dao/specification/merchantsDAO.java

@@ -0,0 +1,136 @@
+package dao.specification;
+
+import dao.merchantsAbstractDAO;
+import org.jetbrains.annotations.NotNull;
+import entities.Merchants;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.sql.*;
+
+import static util.SQLDatabaseConnection.close;
+import static util.SQLDatabaseConnection.getConnection;
+
+public class merchantsDAO implements merchantsAbstractDAO {
+    private Connection connection = null;
+    private PreparedStatement preparedStatement = null;
+    private ResultSet resultSet = null;
+
+    //通过id寻找商家
+    @Override
+    public Merchants searchMerchantByID(Long id) {
+        Merchants merchants = null;
+        String selectID_sql = "select * from Merchants where id = ?";
+        try {
+            connection = getConnection();
+            preparedStatement = connection.prepareStatement(selectID_sql);
+            preparedStatement.setLong(1, id);
+            resultSet = preparedStatement.executeQuery();
+
+            while (resultSet.next()) {
+                merchants = new Merchants();
+                merchants.setId(resultSet.getLong("id"));
+                merchants.setName(resultSet.getString("name"));
+                merchants.setAddress(resultSet.getString("address"));
+                merchants.setDescription(resultSet.getString("description"));
+                merchants.setPhoneNumber(resultSet.getString("phoneNumber"));
+            }
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        } finally {
+            close(connection, preparedStatement, resultSet);
+        }
+        return merchants;
+    }
+
+    //新加商家
+    @Override
+    public int insert(@NotNull Merchants merchants) {
+        int flag = 0;
+        try {
+            connection = getConnection();
+            String insert_sql = "insert into Merchants(name,address,description,phoneNumber) values(?,?,?,?)";
+            preparedStatement = connection.prepareStatement(insert_sql);
+
+            preparedStatement.setString(1, merchants.getName());
+            preparedStatement.setString(2, merchants.getAddress());
+            preparedStatement.setString(3, merchants.getDescription());
+            preparedStatement.setString(4, merchants.getPhoneNumber());
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        } finally {
+            close(connection, preparedStatement, resultSet);
+        }
+        return flag;
+    }
+
+    //删除商家
+    @Override
+    public int delete(Merchants merchants) {
+        int flag = 0;
+        try {
+            connection = getConnection();
+            String delete_sql = "delete from Merchants where id = ?";
+            preparedStatement = connection.prepareStatement(delete_sql);
+            preparedStatement.setLong(1, merchants.getId());
+            flag = preparedStatement.executeUpdate();
+        } catch (Exception e) {
+            e.printStackTrace();
+        } finally {
+            close(connection, preparedStatement, resultSet);
+        }
+        return flag;
+    }
+
+    //更新信息
+    @Override
+    public int update(@NotNull Merchants merchants) {
+        int flag;
+        String update_sql = "update Merchants " +
+                "set name = ?, address = ?, description = ?, phoneNumber= ? " +
+                "where id = ?";
+        try {
+            connection = getConnection();
+            preparedStatement = connection.prepareStatement(update_sql);
+
+            preparedStatement.setString(1, merchants.getName());
+            preparedStatement.setString(2, merchants.getAddress());
+            preparedStatement.setString(3, merchants.getDescription());
+            preparedStatement.setString(4, merchants.getPhoneNumber());
+            preparedStatement.setLong(5, merchants.getId());
+
+            flag = preparedStatement.executeUpdate(update_sql);
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+        return flag;
+    }
+
+    //查询所有商家
+    @Override
+    public List<Merchants> search(Merchants merchants) {
+        List<Merchants> list = new ArrayList<>();
+        try {
+            connection = getConnection();
+            String selectAll_sql = "select * from Merchants";
+            preparedStatement = connection.prepareStatement(selectAll_sql);
+            resultSet = preparedStatement.executeQuery();
+
+            while (resultSet.next()) {
+                merchants.setId(resultSet.getLong("id"));
+                merchants.setName(resultSet.getString("name"));
+                merchants.setPhoneNumber(resultSet.getString("phoneNumber"));
+                merchants.setAddress(resultSet.getString("address"));
+                merchants.setDescription(resultSet.getString("description"));
+                list.add(merchants);
+            }
+
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        } finally {
+            close(connection, preparedStatement, resultSet);
+        }
+        return list;
+    }
+
+}

src/main/java/dao/specification/userDAO.java

@@ -0,0 +1,119 @@
+package dao.specification;
+
+import dao.userAbstractDAO;
+import entities.Users;
+import org.jetbrains.annotations.NotNull;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
+
+import static util.SQLDatabaseConnection.getConnection;
+import static util.SQLDatabaseConnection.close;
+
+public class userDAO implements userAbstractDAO {
+    private Connection connection = null;
+    private PreparedStatement preparedStatement = null;
+    private ResultSet resultSet = null;
+
+    //@TODO UserDAO 插入功能
+    @Override
+    public int insert(Users users) {
+
+        return 0;
+    }
+
+    @Override
+    public int delete(@NotNull Users users) {
+        int flag;
+        try {
+            connection = getConnection();
+            String delete_sql = "delete from Users where id=?";
+            preparedStatement = connection.prepareStatement(delete_sql);
+            preparedStatement.setLong(1, users.getId());
+            flag = preparedStatement.executeUpdate();
+
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        } finally {
+            close(connection, preparedStatement, resultSet);
+        }
+
+        return flag;
+    }
+
+    @Override
+    public int update(@NotNull Users users) {
+        int flag = 0;
+        try {
+            connection = getConnection();
+            String update_sql = "update Users " +
+                    "set name = ?, phoneNumber = ?, address = ? " +
+                    "where id = ?";
+            preparedStatement = connection.prepareStatement(update_sql);
+            preparedStatement.setString(1,users.getName());
+            preparedStatement.setString(2,users.getPhoneNumber());
+            preparedStatement.setString(3,users.getAddress());
+            preparedStatement.setLong(4,users.getId());
+
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+        return flag;
+    }
+
+    //查询所有用户
+    @Override
+    public List<Users> search(Users users) {
+        List<Users> list = new ArrayList<>();
+
+        try {
+            connection = getConnection();
+            String selectAll_sql = "select * from Users";
+            preparedStatement = connection.prepareStatement(selectAll_sql);
+            preparedStatement.executeQuery();
+
+            while (resultSet.next()) {
+                users.setName(resultSet.getString("name"));
+                users.setPhoneNumber(resultSet.getString("phoneNumber"));
+                users.setAddress(resultSet.getString("address"));
+                list.add(users);
+            }
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        } finally {
+            close(connection, preparedStatement, resultSet);
+        }
+        return list;
+    }
+
+    //用ID查询用户
+    @Override
+    public Users searchUsersByID(Long id) {
+        Users user = null;
+        String selectID_sql = "select * from Users where id = ?";
+        try {
+            connection = getConnection();
+            preparedStatement = connection.prepareStatement(selectID_sql);
+            preparedStatement.setLong(1, id);
+            resultSet = preparedStatement.executeQuery();
+
+            while (resultSet.next()) {
+                user = new Users();
+                user.setId(resultSet.getLong("id"));
+                user.setName(resultSet.getString("name"));
+                user.setPhoneNumber(resultSet.getString("phoneNumber"));
+                user.setAddress(resultSet.getString("address"));
+            }
+
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        } finally {
+            close(connection, preparedStatement, resultSet);
+        }
+        return user;
+    }
+}

src/main/java/dao/userAbstractDAO.java

@@ -0,0 +1,8 @@
+package dao;
+
+import entities.Users;
+
+public interface userAbstractDAO extends abstractDAO<Users> {
+    //根据ID查询用户
+    Users searchUsersByID(Long id);
+}

src/main/java/entities/Indent.java

@@ -2,12 +2,17 @@ package entities;
 
 import lombok.Data;
 
+import java.util.Date;
+
 //订单类
 @Data
 public class Indent {
     private Long id;//订单ID
-    private indentItem indentItemID;//外键，菜品ID
+
     private Users userID;//外键，下单用户ID
     private Merchants merchantsID;//外键，餐厅ID
+
     private Float allPrice;//菜品总价
+    Date createdDate;//订单创建时间
+    String message;//下单备注
 }

src/main/java/entities/Merchants.java

@@ -5,10 +5,19 @@ import lombok.Data;
 //商家类
 @Data
 public class Merchants {
-    private Long id;//商家编号
+    private Long id;//主键,商家编号
+
     private String name;//店铺名字
     private String address;//店铺地址
     private String description;//店铺描述
     private String phoneNumber;//商家联系方式
-    private Indent IndentID;//外键，订单ID
+
+    @Override
+    public String toString() {
+        return "\n商家编号：" + this.id +
+                "\n店铺名字：" + this.name +
+                "\n店铺地址：" + this.address +
+                "\n店铺描述：" + this.description +
+                "\n联系方式：" + this.phoneNumber;
+    }
 }

src/main/java/entities/Users.java

@@ -5,8 +5,18 @@ import lombok.Data;
 //用户类
 @Data
 public class Users {
-    private Long id;//用户ID
+    private Long id;//主键，用户ID
+    private String password;//用户密码
     private String name;//用户姓名
     private String phoneNumber;//用户联系方式
     private String address;//家庭住址
+
+    @Override
+    public String toString() {
+        return "\n用户编号：" + this.id +
+                "\n用户姓名：" + this.name +
+                "\n家庭地址：" + this.address +
+                "\n联系方式：" + this.phoneNumber;
+    }
+
 }

src/main/java/entities/indentItem.java

@@ -4,10 +4,12 @@ import lombok.Data;
 //订单中的菜品
 @Data
 public class indentItem {
-    private Long id;//菜品ID
+    private Long id;//主键，菜品ID
     private String name;//菜品名字
     private Float initialPrice;//菜品原价
     private Float discount;//折扣
     private Float finalPrice;//最终价格
     private String description;//菜品描述
+
+    private Indent indentID;//订单ID
 }

src/main/java/example/App.java

@@ -1,7 +1,9 @@
 package example;
 
+import entities.*;
+
 public class App {
     public static void main(String[] args) {
-        System.out.println("Hello World!");
+        System.out.println("你好世界！Hello World!");
     }
 }

src/main/java/example/shellUI.java

@@ -0,0 +1,55 @@
+package example;
+
+import com.microsoft.sqlserver.jdbc.StringUtils;
+import dao.*;
+import dao.specification.*;
+
+import java.util.Scanner;
+
+public class shellUI {
+    public static void main(String[] args) {
+        run();
+    }
+
+    public static void run() {
+        Scanner reader = new Scanner(System.in);
+        System.out.println("""
+                ------------------------------------------
+                ----------------后台管理系统----------------
+                ------------------------------------------
+                """);
+        System.out.println("""
+                请选择你要进行的功能
+                1.商家管理
+                2.用户管理
+                """);
+        //
+        int chose1;
+        while (true) {
+            if (reader.hasNextInt()) {
+                chose1 = reader.nextInt();
+                break;
+            } else {
+                System.out.println("你的输入有误，请重新输入！");
+            }
+        }
+        //@TODO 2023-05-05 shellUI功能选择
+        int chose2;
+        switch (chose1) {
+            case 1:
+                System.out.println("""
+                        请选择你想使用的功能：
+                        1.
+                        2.
+                        3.
+                        4.
+                        5.
+                        """);
+
+                break;
+            case 2:
+        }
+
+
+    }
+}

src/main/java/util/SQLDatabaseConnection.java

@@ -0,0 +1,47 @@
+package util;
+
+import java.sql.*;
+
+public class SQLDatabaseConnection {
+    // Connect to database
+    private static final String connectionUrl =
+            "jdbc:sqlserver://152.136.182.168:1433;"
+                    + "database=Elm;"
+                    + "user=guest@152.136.182.168;"
+                    + "password=20230504#Guest;"
+                    + "encrypt=true;"
+                    + "trustServerCertificate=false;"
+                    + "loginTimeout=30;";
+
+    public static Connection getConnection() {
+        Connection connection = null;
+        try {
+            // Code here.
+            connection = DriverManager.getConnection(connectionUrl);
+        }
+        // Handle any errors that may have occurred.
+        catch (SQLException e) {
+            e.printStackTrace();
+        }
+        return connection;
+    }
+
+    //释放资源
+    public static void close(Connection connection, Statement statement, ResultSet resultSet) {
+        try {
+            if (resultSet != null) {
+                resultSet.close();
+            }
+            if (statement != null) {
+                statement.close();
+            }
+            if (connection != null) {
+                connection.close();
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+
+    }
+
+}