1.lombok的使用

2.Spring-mybatis-增删改查准备工作

springboot-mybatis-crud/.gitignore

@@ -0,0 +1,33 @@
+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/

springboot-mybatis-crud/pom.xml

@@ -0,0 +1,83 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>com.inmind</groupId>
+    <artifactId>springboot-mybatis-crud</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>springboot-mybatis-crud</name>
+    <description>springboot-mybatis-crud</description>
+    <properties>
+        <java.version>11</java.version>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+        <spring-boot.version>2.7.6</spring-boot.version>
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>org.mybatis.spring.boot</groupId>
+            <artifactId>mybatis-spring-boot-starter</artifactId>
+            <version>2.3.0</version>
+        </dependency>
+
+        <dependency>
+            <groupId>com.mysql</groupId>
+            <artifactId>mysql-connector-j</artifactId>
+            <scope>runtime</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-dependencies</artifactId>
+                <version>${spring-boot.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.8.1</version>
+                <configuration>
+                    <source>11</source>
+                    <target>11</target>
+                    <encoding>UTF-8</encoding>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+                <version>${spring-boot.version}</version>
+                <configuration>
+                    <mainClass>com.inmind.SpringbootMybatisCrudApplication</mainClass>
+                    <skip>true</skip>
+                </configuration>
+                <executions>
+                    <execution>
+                        <id>repackage</id>
+                        <goals>
+                            <goal>repackage</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

springboot-mybatis-crud/src/main/java/com/inmind/SpringbootMybatisCrudApplication.java

@@ -0,0 +1,13 @@
+package com.inmind;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SpringbootMybatisCrudApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(SpringbootMybatisCrudApplication.class, args);
+    }
+
+}

springboot-mybatis-crud/src/main/java/com/inmind/mapper/EmpMapper.java

@@ -0,0 +1,8 @@
+package com.inmind.mapper;
+
+import org.apache.ibatis.annotations.Mapper;
+
+@Mapper
+public interface EmpMapper {
+
+}

springboot-mybatis-crud/src/main/java/com/inmind/pojo/Emp.java

@@ -0,0 +1,26 @@
+package com.inmind.pojo;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class Emp {
+    private Integer id;//ID
+    private String username;//用户名
+    private String password;//密码
+    private String name;//姓名
+    private Short gender;//性别 1:男 2：女
+    private String image; //头像URL
+    private String job; // 职位 1:班主任 2:讲师 3:学工主管 4:教研主管 5:咨询师
+    private LocalDate entrydate; // 入职日期
+    private Integer deptId; // 部门ID
+    private LocalDateTime createTime;
+    private LocalDateTime updateTime;
+
+}

springboot-mybatis-crud/src/main/resources/application.properties

@@ -0,0 +1,14 @@
+#下面这些内容是为了让MyBatis映射
+#指定Mybatis的Mapper文件
+mybatis.mapper-locations=classpath:mappers/*xml
+#指定Mybatis的实体目录
+mybatis.type-aliases-package=com.inmind.mybatis.entity
+
+#驱动类名称
+spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
+#数据库连接的url
+spring.datasource.url=jdbc:mysql://localhost:3306/mybatis
+#连接数据库的用户名
+spring.datasource.username=root
+#连接数据库的密码
+spring.datasource.password=1234

springboot-mybatis-crud/src/test/java/com/inmind/SpringbootMybatisCrudApplicationTests.java

@@ -0,0 +1,13 @@
+package com.inmind;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class SpringbootMybatisCrudApplicationTests {
+
+    @Test
+    void contextLoads() {
+    }
+
+}

springboot-mybatis-quickstart/pom.xml

@@ -44,6 +44,18 @@
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
         </dependency>
+
+        <!--阿里巴巴的DRUID依赖-->
+        <dependency>
+            <groupId>com.alibaba</groupId>
+            <artifactId>druid-spring-boot-starter</artifactId>
+            <version>1.2.8</version>
+        </dependency>
+        <!--lombok依赖-->
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+        </dependency>
     </dependencies>
     <!--统一springboot依赖管理版本-->
     <dependencyManagement>

springboot-mybatis-quickstart/src/main/java/com/inmind/mapper/UserMapper.java

@@ -14,6 +14,7 @@ public interface UserMapper {
     /*
     查询所有用户数据
      */
-    @Select("select  * from user;")
+//    @Select("select  * from user;")
+    @Select("select * from user")
     public List<User> list();
 }

springboot-mybatis-quickstart/src/main/java/com/inmind/pojo/User.java

@@ -1,5 +1,14 @@
 package com.inmind.pojo;
 
+import lombok.*;
+
+/*@Getter
+@Setter
+@ToString
+@EqualsAndHashCode*/
+@Data
+@NoArgsConstructor //生成无参构造
+@AllArgsConstructor//生成满参构造方法
 public class User {
     private Integer id;
     private String name;
@@ -7,65 +16,4 @@ public class User {
     private Short gender;
     private String phone;
 
-    public User() {
-    }
-
-    public User(Integer id, String name, Integer age, Short gender, String phone) {
-        this.id = id;
-        this.name = name;
-        this.age = age;
-        this.gender = gender;
-        this.phone = phone;
-    }
-
-    @Override
-    public String toString() {
-        return "User{" +
-                "id=" + id +
-                ", name='" + name + '\'' +
-                ", age=" + age +
-                ", gender=" + gender +
-                ", phone='" + phone + '\'' +
-                '}';
-    }
-
-    public Integer getId() {
-        return id;
-    }
-
-    public void setId(Integer id) {
-        this.id = id;
-    }
-
-    public String getName() {
-        return name;
-    }
-
-    public void setName(String name) {
-        this.name = name;
-    }
-
-    public Integer getAge() {
-        return age;
-    }
-
-    public void setAge(Integer age) {
-        this.age = age;
-    }
-
-    public Short getGender() {
-        return gender;
-    }
-
-    public void setGender(Short gender) {
-        this.gender = gender;
-    }
-
-    public String getPhone() {
-        return phone;
-    }
-
-    public void setPhone(String phone) {
-        this.phone = phone;
-    }
 }

springboot-mybatis-quickstart/src/test/java/com/inmind/SpringbootMybatisQuickstartApplicationTests.java

@@ -6,21 +6,61 @@ import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
 
+import java.sql.*;
+import java.util.ArrayList;
 import java.util.List;
 
-@SpringBootTest
+@SpringBootTest //该注解的作用，启动spring环境，所以也就有了IOC容器
 class SpringbootMybatisQuickstartApplicationTests {
 
     @Autowired//直接从IOC容器中获取UserMapper类型的对象
-    private UserMapper userMapper;
+    private UserMapper userMapper;//接口开发，多态
 
     @Test
     void contextLoads() {
         //使用mybatis框架查询所有用户的数据
         List<User> list = userMapper.list();
         list.stream().forEach(user -> {
+            System.out.println(user.getId());
             System.out.println(user);
         });
     }
 
+    @Test
+    void testJDBC() throws ClassNotFoundException, SQLException {
+        //1. 注册驱动
+        Class.forName("com.mysql.cj.jdbc.Driver");
+
+        //2. 获取连接对象
+        String url = "jdbc:mysql://localhost:3306/mybatis";
+        String username = "root";
+        String password = "1234";
+        Connection connection = DriverManager.getConnection(url, username, password);
+
+        //3. 获取执行SQL的对象Statement,执行SQL,返回结果
+        String sql = "select * from user";
+        Statement statement = connection.createStatement();
+        ResultSet resultSet = statement.executeQuery(sql);
+
+        //4. 封装结果数据
+        List<User> userList = new ArrayList<>();
+        while (resultSet.next()){
+            int id = resultSet.getInt("id");
+            String name = resultSet.getString("name");
+            int age = resultSet.getInt("age");
+            short gender = resultSet.getShort("gender");
+            String phone = resultSet.getString("phone");
+
+            User user = new User(id,name,age,gender,phone);
+            userList.add(user);
+        }
+
+        //5. 释放资源
+        statement.close();
+        connection.close();
+
+
+        userList.forEach(System.out::println);
+    }
+
 }