代宇航进行数据库配置和User类，并推送

王健旭编写Material类
喻廷屿编写MaterialStock类
孙佳兴编写Reservation类
赵文博编写Lab类

equipment-MyBatisProject/src/com/ssm/entity/Lab.java

@@ -5,20 +5,16 @@ public class Lab {
     private String lname;
     private String location;
     private Integer capacity;
-    private Integer managerId;
-    private Integer state;
+    private String status;
 
-    // 无参构造
     public Lab() {}
 
-    // 全参构造
-    public Lab(Integer lid, String lname, String location, Integer capacity, Integer managerId, Integer state) {
+    public Lab(Integer lid, String lname, String location, Integer capacity, String status) {
         this.lid = lid;
         this.lname = lname;
         this.location = location;
         this.capacity = capacity;
-        this.managerId = managerId;
-        this.state = state;
+        this.status = status;
     }
 
     // Getter/Setter
@@ -30,10 +26,8 @@ public class Lab {
     public void setLocation(String location) { this.location = location; }
     public Integer getCapacity() { return capacity; }
     public void setCapacity(Integer capacity) { this.capacity = capacity; }
-    public Integer getManagerId() { return managerId; }
-    public void setManagerId(Integer managerId) { this.managerId = managerId; }
-    public Integer getState() { return state; }
-    public void setState(Integer state) { this.state = state; }
+    public String getStatus() { return status; }
+    public void setStatus(String status) { this.status = status; }
 
     @Override
     public String toString() {
@@ -42,8 +36,7 @@ public class Lab {
                 ", lname='" + lname + '\'' +
                 ", location='" + location + '\'' +
                 ", capacity=" + capacity +
-                ", managerId=" + managerId +
-                ", state=" + state +
+                ", status='" + status + '\'' +
                 '}';
     }
 }

equipment-MyBatisProject/src/com/ssm/entity/MaterialStock.java

@@ -11,33 +11,61 @@ public class MaterialStock {
     private Date updateTime;
     private Integer state;
 
-    public MaterialStock() {}
+    public Integer getStockId() {
+        return stockId;
+    }
 
-    public MaterialStock(Integer stockId, Integer materialId, Integer stockNum, Integer warnNum, String location, Date updateTime, Integer state) {
+    public void setStockId(Integer stockId) {
         this.stockId = stockId;
+    }
+
+    public Integer getMaterialId() {
+        return materialId;
+    }
+
+    public void setMaterialId(Integer materialId) {
         this.materialId = materialId;
+    }
+
+    public Integer getStockNum() {
+        return stockNum;
+    }
+
+    public void setStockNum(Integer stockNum) {
         this.stockNum = stockNum;
+    }
+
+    public Integer getWarnNum() {
+        return warnNum;
+    }
+
+    public void setWarnNum(Integer warnNum) {
         this.warnNum = warnNum;
+    }
+
+    public String getLocation() {
+        return location;
+    }
+
+    public void setLocation(String location) {
         this.location = location;
+    }
+
+    public Date getUpdateTime() {
+        return updateTime;
+    }
+
+    public void setUpdateTime(Date updateTime) {
         this.updateTime = updateTime;
-        this.state = state;
     }
 
-    // getter & setter
-    public Integer getStockId() { return stockId; }
-    public void setStockId(Integer stockId) { this.stockId = stockId; }
-    public Integer getMaterialId() { return materialId; }
-    public void setMaterialId(Integer materialId) { this.materialId = materialId; }
-    public Integer getStockNum() { return stockNum; }
-    public void setStockNum(Integer stockNum) { this.stockNum = stockNum; }
-    public Integer getWarnNum() { return warnNum; }
-    public void setWarnNum(Integer warnNum) { this.warnNum = warnNum; }
-    public String getLocation() { return location; }
-    public void setLocation(String location) { this.location = location; }
-    public Date getUpdateTime() { return updateTime; }
-    public void setUpdateTime(Date updateTime) { this.updateTime = updateTime; }
-    public Integer getState() { return state; }
-    public void setState(Integer state) { this.state = state; }
+    public Integer getState() {
+        return state;
+    }
+
+    public void setState(Integer state) {
+        this.state = state;
+    }
 
     @Override
     public String toString() {

equipment-MyBatisProject/src/com/ssm/entity/Reservation.java

@@ -12,36 +12,69 @@ public class Reservation {
     private String status;
     private Date createTime;
 
-    public Reservation() {}
+    public Integer getRid() {
+        return rid;
+    }
 
-    public Reservation(Integer rid, Integer userId, Integer labId, Integer materialId, Date reserveTime, String purpose, String status, Date createTime) {
+    public void setRid(Integer rid) {
         this.rid = rid;
+    }
+
+    public Integer getUserId() {
+        return userId;
+    }
+
+    public void setUserId(Integer userId) {
         this.userId = userId;
+    }
+
+    public Integer getLabId() {
+        return labId;
+    }
+
+    public void setLabId(Integer labId) {
         this.labId = labId;
+    }
+
+    public Integer getMaterialId() {
+        return materialId;
+    }
+
+    public void setMaterialId(Integer materialId) {
         this.materialId = materialId;
+    }
+
+    public Date getReserveTime() {
+        return reserveTime;
+    }
+
+    public void setReserveTime(Date reserveTime) {
         this.reserveTime = reserveTime;
+    }
+
+    public String getPurpose() {
+        return purpose;
+    }
+
+    public void setPurpose(String purpose) {
         this.purpose = purpose;
+    }
+
+    public String getStatus() {
+        return status;
+    }
+
+    public void setStatus(String status) {
         this.status = status;
-        this.createTime = createTime;
     }
 
-    // getter & setter
-    public Integer getRid() { return rid; }
-    public void setRid(Integer rid) { this.rid = rid; }
-    public Integer getUserId() { return userId; }
-    public void setUserId(Integer userId) { this.userId = userId; }
-    public Integer getLabId() { return labId; }
-    public void setLabId(Integer labId) { this.labId = labId; }
-    public Integer getMaterialId() { return materialId; }
-    public void setMaterialId(Integer materialId) { this.materialId = materialId; }
-    public Date getReserveTime() { return reserveTime; }
-    public void setReserveTime(Date reserveTime) { this.reserveTime = reserveTime; }
-    public String getPurpose() { return purpose; }
-    public void setPurpose(String purpose) { this.purpose = purpose; }
-    public String getStatus() { return status; }
-    public void setStatus(String status) { this.status = status; }
-    public Date getCreateTime() { return createTime; }
-    public void setCreateTime(Date createTime) { this.createTime = createTime; }
+    public Date getCreateTime() {
+        return createTime;
+    }
+
+    public void setCreateTime(Date createTime) {
+        this.createTime = createTime;
+    }
 
     @Override
     public String toString() {

equipment-MyBatisProject/src/com/ssm/mapper/LabMapper.java

@@ -0,0 +1,9 @@
+package com.ssm.mapper;
+
+import com.ssm.entity.Lab;
+import java.util.List;
+
+public interface LabMapper {
+    Lab getLabById(Integer lid);
+    List<Lab> getAllLabs();
+}

equipment-MyBatisProject/src/com/ssm/mapper/LabMapper.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE mapper
+        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
+        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+
+<mapper namespace="com.ssm.mapper.LabMapper">
+    <select id="getLabById" resultType="com.ssm.entity.Lab" parameterType="Integer">
+        SELECT * FROM lab WHERE lid = #{lid}
+    </select>
+
+    <select id="getAllLabs" resultType="com.ssm.entity.Lab">
+        SELECT * FROM lab
+    </select>
+</mapper>

equipment-MyBatisProject/src/com/ssm/mapper/MaterialMapper.java

@@ -0,0 +1,9 @@
+package com.ssm.mapper;
+
+import com.ssm.entity.Material;
+import java.util.List;
+
+public interface MaterialMapper {
+    Material getMaterialById(Integer mid);
+    List<Material> getAllMaterials();
+}

equipment-MyBatisProject/src/com/ssm/mapper/MaterialMapper.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE mapper
+        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
+        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+
+<mapper namespace="com.ssm.mapper.MaterialMapper">
+    <select id="getMaterialById" resultType="com.ssm.entity.Material">
+        SELECT * FROM material WHERE mid=#{mid}
+    </select>
+
+    <select id="getAllMaterials" resultType="com.ssm.entity.Material">
+        SELECT * FROM material
+    </select>
+</mapper>

equipment-MyBatisProject/src/com/ssm/mapper/MaterialStockMapper.java

@@ -0,0 +1,11 @@
+package com.ssm.mapper;
+
+import com.ssm.entity.MaterialStock;
+import java.util.List;
+
+public interface MaterialStockMapper {
+    // 根据库存ID查询
+    MaterialStock getStockById(Integer stockId);
+    // 查询所有库存
+    List<MaterialStock> getAllStocks();
+}

equipment-MyBatisProject/src/com/ssm/mapper/MaterialStockMapper.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE mapper
+        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
+        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+
+<mapper namespace="com.ssm.mapper.MaterialStockMapper">
+
+    <!-- 根据库存ID查询 -->
+    <select id="getStockById" resultType="com.ssm.entity.MaterialStock">
+        SELECT * FROM materialstock WHERE stock_id = #{stockId}
+    </select>
+
+    <!-- 查询所有库存 -->
+    <select id="getAllStocks" resultType="com.ssm.entity.MaterialStock">
+        SELECT * FROM materialstock
+    </select>
+
+</mapper>

equipment-MyBatisProject/src/com/ssm/mapper/ReservationMapper.java

@@ -0,0 +1,9 @@
+package com.ssm.mapper;
+
+import com.ssm.entity.Reservation;
+import java.util.List;
+
+public interface ReservationMapper {
+    Reservation getReservationById(Integer rid);
+    List<Reservation> getAllReservations();
+}

equipment-MyBatisProject/src/com/ssm/mapper/ReservationMapper.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE mapper
+        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
+        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+
+<mapper namespace="com.ssm.mapper.ReservationMapper">
+
+    <select id="getReservationById" resultType="com.ssm.entity.Reservation">
+        SELECT * FROM reservation WHERE rid = #{rid}
+    </select>
+
+    <select id="getAllReservations" resultType="com.ssm.entity.Reservation">
+        SELECT * FROM reservation
+    </select>
+
+</mapper>

equipment-MyBatisProject/src/com/ssm/mapper/UserMapper.java

@@ -0,0 +1,11 @@
+package com.ssm.mapper;
+
+import com.ssm.entity.User;
+import java.util.List;
+
+public interface UserMapper {
+
+    User getUserById(Integer uid);
+
+    List<User> getAllUsers();
+}

equipment-MyBatisProject/src/com/ssm/mapper/UserMapper.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE mapper
+        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
+        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+
+<mapper namespace="com.ssm.mapper.UserMapper">
+
+    <select id="getUserById"
+            resultType="com.ssm.entity.User"
+            parameterType="Integer">
+        SELECT *
+        FROM user
+        WHERE uid = #{uid}
+    </select>
+
+    <select id="getAllUsers"
+            resultType="com.ssm.entity.User">
+        SELECT *
+        FROM user
+    </select>
+
+</mapper>

equipment-MyBatisProject/src/com/ssm/test/TestLab.java

@@ -1,35 +1,49 @@
 package com.ssm.test;
 
 import com.ssm.entity.Lab;
+import com.ssm.mapper.LabMapper;
 import org.apache.ibatis.io.Resources;
 import org.apache.ibatis.session.SqlSession;
+import org.apache.ibatis.session.SqlSessionFactory;
 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
 
-import java.sql.Connection;
-import java.sql.ResultSet;
-import java.util.ArrayList;
+import java.io.IOException;
+import java.io.Reader;
 import java.util.List;
 
 public class TestLab {
-    public static void main(String[] args) throws Exception {
-        SqlSession session = new SqlSessionFactoryBuilder().build(Resources.getResourceAsStream("config.xml")).openSession(true);
-        Connection conn = session.getConnection();
+    public static void main(String[] args) throws IOException {
+        testGetLabById();
+        testGetAllLabs();
+    }
 
-        List<Lab> list = new ArrayList<>();
-        ResultSet rs = conn.prepareStatement("select * from lab").executeQuery();
-        while (rs.next()) {
-            Lab l = new Lab();
-            l.setLid(rs.getInt("lid"));
-            l.setLname(rs.getString("lname"));
-            l.setLocation(rs.getString("location"));
-            l.setCapacity(rs.getInt("capacity"));
-            l.setManagerId(rs.getInt("manager_id"));
-            l.setState(rs.getInt("state"));
-            list.add(l);
+    private static void testGetLabById() throws IOException {
+        Reader reader = Resources.getResourceAsReader("config.xml");
+        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(reader);
+        SqlSession sqlSession = factory.openSession();
+        try {
+            LabMapper mapper = sqlSession.getMapper(LabMapper.class);
+            Lab lab = mapper.getLabById(1);
+            System.out.println("===== 根据ID查询实验室 =====");
+            System.out.println(lab);
+        } finally {
+            sqlSession.close();
         }
+    }
 
-        System.out.println("===== 实验室表 =====");
-        for (Lab l : list) System.out.println(l);
-        session.close();
+    private static void testGetAllLabs() throws IOException {
+        Reader reader = Resources.getResourceAsReader("config.xml");
+        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(reader);
+        SqlSession sqlSession = factory.openSession();
+        try {
+            LabMapper mapper = sqlSession.getMapper(LabMapper.class);
+            List<Lab> labList = mapper.getAllLabs();
+            System.out.println("\n===== 所有实验室信息 =====");
+            for (Lab lab : labList) {
+                System.out.println(lab);
+            }
+        } finally {
+            sqlSession.close();
+        }
     }
 }

equipment-MyBatisProject/src/com/ssm/test/TestMaterial.java

@@ -1,48 +1,44 @@
 package com.ssm.test;
 
 import com.ssm.entity.Material;
+import com.ssm.mapper.MaterialMapper;
 import org.apache.ibatis.io.Resources;
 import org.apache.ibatis.session.SqlSession;
+import org.apache.ibatis.session.SqlSessionFactory;
 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
 
-import java.sql.Connection;
-import java.sql.ResultSet;
-import java.util.ArrayList;
+import java.io.Reader;
 import java.util.List;
 
 public class TestMaterial {
     public static void main(String[] args) throws Exception {
-        // 1. 获取SqlSession和数据库连接
-        SqlSession session = new SqlSessionFactoryBuilder()
-                .build(Resources.getResourceAsStream("config.xml"))
-                .openSession(true);
-        Connection conn = session.getConnection();
+        testGetMaterialById();
+        testGetAllMaterials();
+    }
 
-        // 2. 执行查询
-        List<Material> list = new ArrayList<>();
-        ResultSet rs = conn.prepareStatement("select * from material").executeQuery();
+    private static void testGetMaterialById() throws Exception {
+        Reader reader = Resources.getResourceAsReader("config.xml");
+        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(reader);
+        SqlSession session = factory.openSession();
 
-        // 3. 把结果集映射到实体类
-        while (rs.next()) {
-            Material m = new Material();
-            m.setMid(rs.getInt("mid"));
-            m.setMname(rs.getString("mname"));
-            m.setType(rs.getString("type"));
-            m.setSpec(rs.getString("spec"));
-            m.setPrice(rs.getDouble("price"));
-            m.setLabId(rs.getInt("lab_id"));
-            m.setStockNum(rs.getInt("stock_num"));
-            m.setState(rs.getInt("state"));
-            list.add(m);
-        }
+        MaterialMapper mapper = session.getMapper(MaterialMapper.class);
+        Material m = mapper.getMaterialById(1);
+        System.out.println("===== 根据ID查询器材 =====");
+        System.out.println(m);
+        session.close();
+    }
 
-        // 4. 打印结果
-        System.out.println("===== 器材表数据 =====");
-        for (Material material : list) {
-            System.out.println(material);
-        }
+    private static void testGetAllMaterials() throws Exception {
+        Reader reader = Resources.getResourceAsReader("config.xml");
+        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(reader);
+        SqlSession session = factory.openSession();
 
-        // 5. 关闭资源
+        MaterialMapper mapper = session.getMapper(MaterialMapper.class);
+        List<Material> list = mapper.getAllMaterials();
+        System.out.println("\n===== 所有器材信息 =====");
+        for (Material m : list) {
+            System.out.println(m);
+        }
         session.close();
     }
 }

equipment-MyBatisProject/src/com/ssm/test/TestMaterialStock.java

@@ -0,0 +1,45 @@
+package com.ssm.test;
+
+import com.ssm.entity.MaterialStock;
+import com.ssm.mapper.MaterialStockMapper;
+import org.apache.ibatis.io.Resources;
+import org.apache.ibatis.session.SqlSession;
+import org.apache.ibatis.session.SqlSessionFactory;
+import org.apache.ibatis.session.SqlSessionFactoryBuilder;
+
+import java.io.Reader;
+import java.util.List;
+
+public class TestMaterialStock {
+    public static void main(String[] args) throws Exception {
+        testGetStockById();
+        testGetAllStocks();
+    }
+
+    private static void testGetStockById() throws Exception {
+        Reader reader = Resources.getResourceAsReader("config.xml");
+        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(reader);
+        SqlSession session = factory.openSession();
+
+        MaterialStockMapper mapper = session.getMapper(MaterialStockMapper.class);
+        // 查询stock_id=1的库存
+        MaterialStock s = mapper.getStockById(1);
+        System.out.println("===== 根据库存ID查询 =====");
+        System.out.println(s);
+        session.close();
+    }
+
+    private static void testGetAllStocks() throws Exception {
+        Reader reader = Resources.getResourceAsReader("config.xml");
+        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(reader);
+        SqlSession session = factory.openSession();
+
+        MaterialStockMapper mapper = session.getMapper(MaterialStockMapper.class);
+        List<MaterialStock> list = mapper.getAllStocks();
+        System.out.println("\n===== 所有库存信息 =====");
+        for (MaterialStock s : list) {
+            System.out.println(s);
+        }
+        session.close();
+    }
+}

equipment-MyBatisProject/src/com/ssm/test/TestReservation.java

@@ -1,36 +1,44 @@
 package com.ssm.test;
 
 import com.ssm.entity.Reservation;
+import com.ssm.mapper.ReservationMapper;
 import org.apache.ibatis.io.Resources;
 import org.apache.ibatis.session.SqlSession;
+import org.apache.ibatis.session.SqlSessionFactory;
 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
 
-import java.sql.Connection;
-import java.sql.ResultSet;
-import java.util.ArrayList;
+import java.io.Reader;
 import java.util.List;
 
 public class TestReservation {
     public static void main(String[] args) throws Exception {
-        SqlSession session = new SqlSessionFactoryBuilder().build(Resources.getResourceAsStream("config.xml")).openSession(true);
-        Connection conn = session.getConnection();
+        testGetReservationById();
+        testGetAllReservations();
+    }
 
-        List<Reservation> list = new ArrayList<>();
-        ResultSet rs = conn.prepareStatement("select * from reservation").executeQuery();
-        while (rs.next()) {
-            Reservation r = new Reservation();
-            r.setRid(rs.getInt("rid"));
-            r.setUserId(rs.getInt("user_id"));
-            r.setLabId(rs.getInt("lab_id"));
-            r.setMaterialId(rs.getInt("material_id"));
-            r.setReserveTime(rs.getTimestamp("reserve_time"));
-            r.setPurpose(rs.getString("purpose"));
-            r.setStatus(rs.getString("status"));
-            list.add(r);
-        }
+    private static void testGetReservationById() throws Exception {
+        Reader reader = Resources.getResourceAsReader("config.xml");
+        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(reader);
+        SqlSession session = factory.openSession();
 
-        System.out.println("===== 预约表 =====");
-        for (Reservation r : list) System.out.println(r);
+        ReservationMapper mapper = session.getMapper(ReservationMapper.class);
+        Reservation r = mapper.getReservationById(1);
+        System.out.println("===== 根据预约ID查询 =====");
+        System.out.println(r);
+        session.close();
+    }
+
+    private static void testGetAllReservations() throws Exception {
+        Reader reader = Resources.getResourceAsReader("config.xml");
+        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(reader);
+        SqlSession session = factory.openSession();
+
+        ReservationMapper mapper = session.getMapper(ReservationMapper.class);
+        List<Reservation> list = mapper.getAllReservations();
+        System.out.println("\n===== 所有预约信息 =====");
+        for (Reservation r : list) {
+            System.out.println(r);
+        }
         session.close();
     }
 }

equipment-MyBatisProject/src/com/ssm/test/TestStock.java

@@ -1,35 +0,0 @@
-package com.ssm.test;
-
-import com.ssm.entity.MaterialStock;
-import org.apache.ibatis.io.Resources;
-import org.apache.ibatis.session.SqlSession;
-import org.apache.ibatis.session.SqlSessionFactoryBuilder;
-
-import java.sql.Connection;
-import java.sql.ResultSet;
-import java.util.ArrayList;
-import java.util.List;
-
-public class TestStock {
-    public static void main(String[] args) throws Exception {
-        SqlSession session = new SqlSessionFactoryBuilder().build(Resources.getResourceAsStream("config.xml")).openSession(true);
-        Connection conn = session.getConnection();
-
-        List<MaterialStock> list = new ArrayList<>();
-        ResultSet rs = conn.prepareStatement("select * from material_stock").executeQuery();
-        while (rs.next()) {
-            MaterialStock s = new MaterialStock();
-            s.setStockId(rs.getInt("stock_id"));
-            s.setMaterialId(rs.getInt("material_id"));
-            s.setStockNum(rs.getInt("stock_num"));
-            s.setWarnNum(rs.getInt("warn_num"));
-            s.setLocation(rs.getString("location"));
-            s.setState(rs.getInt("state"));
-            list.add(s);
-        }
-
-        System.out.println("===== 库存表 =====");
-        for (MaterialStock s : list) System.out.println(s);
-        session.close();
-    }
-}

equipment-MyBatisProject/src/com/ssm/test/TestUser.java

@@ -1,37 +1,65 @@
 package com.ssm.test;
 
 import com.ssm.entity.User;
+import com.ssm.mapper.UserMapper;
 import org.apache.ibatis.io.Resources;
 import org.apache.ibatis.session.SqlSession;
 import org.apache.ibatis.session.SqlSessionFactory;
 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
 
-import java.sql.Connection;
-import java.sql.PreparedStatement;
-import java.sql.ResultSet;
-import java.util.ArrayList;
+import java.io.IOException;
+import java.io.Reader;
 import java.util.List;
 
 public class TestUser {
-    public static void main(String[] args) throws Exception {
-        SqlSession session = new SqlSessionFactoryBuilder().build(Resources.getResourceAsStream("config.xml")).openSession(true);
-        Connection conn = session.getConnection();
-
-        List<User> list = new ArrayList<>();
-        ResultSet rs = conn.prepareStatement("select * from user").executeQuery();
-        while (rs.next()) {
-            User u = new User();
-            u.setUid(rs.getInt("uid"));
-            u.setUsername(rs.getString("username"));
-            u.setPassword(rs.getString("password"));
-            u.setPhone(rs.getString("phone"));
-            u.setRole(rs.getString("role"));
-            u.setState(rs.getInt("state"));
-            list.add(u);
+
+    public static void main(String[] args) throws IOException {
+
+        testGetUserById();
+
+        testGetAllUsers();
+    }
+
+
+    private static void testGetUserById() throws IOException {
+
+        Reader reader = Resources.getResourceAsReader("config.xml");
+
+        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(reader);
+
+        SqlSession sqlSession = factory.openSession();
+
+        try {
+            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
+            User user = mapper.getUserById(1);
+
+            System.out.println("===== 根据ID查询用户 =====");
+            System.out.println(user);
+        } finally {
+
+            sqlSession.close();
         }
+    }
+
+    private static void testGetAllUsers() throws IOException {
+
+        Reader reader = Resources.getResourceAsReader("config.xml");
 
-        System.out.println("===== 用户表 =====");
-        for (User u : list) System.out.println(u);
-        session.close();
+        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(reader);
+
+        SqlSession sqlSession = factory.openSession();
+
+        try {
+            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
+            List<User> userList = mapper.getAllUsers();
+
+            System.out.println("\n===== 所有用户信息 =====");
+            for (User user : userList) {
+                System.out.println(user);
+            }
+        } finally {
+
+            sqlSession.close();
+        }
     }
 }

equipment-MyBatisProject/src/config.xml

@@ -3,7 +3,7 @@
         PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
         "http://mybatis.org/dtd/mybatis-3-config.dtd">
 <configuration>
-    <!-- 开启下划线转驼峰，解决数据库字段名和实体类属性名的映射问题 -->
+    <!-- 开启下划线转驼峰，自动映射数据库字段 -->
     <settings>
         <setting name="mapUnderscoreToCamelCase" value="true"/>
     </settings>
@@ -13,7 +13,7 @@
         <package name="com.ssm.entity"/>
     </typeAliases>
 
-    <!-- 配置环境 -->
+    <!-- 数据库环境配置 -->
     <environments default="development">
         <environment id="development">
             <transactionManager type="JDBC"/>
@@ -26,6 +26,8 @@
         </environment>
     </environments>
 
+    <!-- ✅✅✅ 这是万能写法，自动扫描所有 Mapper，永远不报错 ✅✅✅ -->
     <mappers>
+        <package name="com.ssm.mapper"/>
     </mappers>
 </configuration>