1.搭建项目环境
1.创建项目
详细创建步骤可以参考博文：传送门！！！
2.修改 POM 文件，添加相关依赖
<?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>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.0.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.bjsxt</groupId>
<artifactId>springbootmybatis</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>springbootmybatis</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--Mybatis启动器-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.1</version>
</dependency>
<!--数据库驱动坐标-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.38</version>
</dependency>
<!--Druid数据源依赖-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.12</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>com.bjsxt</groupId>
<artifactId>springbootjdbc</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<!--配置Generator插件-->
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.5</version>
<dependencies>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.38</version>
</dependency>
</dependencies>
<!--指定配置文件的路径-->
<configuration>
<configurationFile>${project.basedir}/src/main/resources/generatorConfig.xml</configurationFile>
<verbose>true</verbose>
<overwrite>true</overwrite>
</configuration>
</plugin>
</plugins>
<!--配置资源拷贝插件-->
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.xml</include>
</includes>
</resource>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.yml</include>
<include>**/*.properties</include>
</includes>
</resource>
</resources>
</build>
</project>
3.配置数据源
spring:
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=false
username: root
password: root
type: com.alibaba.druid.pool.DruidDataSource
2.配置 Maven 的 generator 插件
1.添加 generator 配置文件
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
<context id="testTables" targetRuntime="MyBatis3">
<commentGenerator>
<!-- 是否去除自动生成的注释 true：是 ： false:否 -->
<property name="suppressAllComments" value="true"/>
</commentGenerator>
<!--数据库连接的信息：驱动类、连接地址、用户名、密码 -->
<jdbcConnection driverClass="com.mysql.jdbc.Driver"
connectionURL="jdbc:mysql://localhost:3306/test" userId="root"
password="root">
</jdbcConnection>
<!-- 默认false，把JDBC DECIMAL 和 NUMERIC 类型解析为 Integer，为 true时把JDBC DECIMAL 和
NUMERIC 类型解析为java.math.BigDecimal -->
<javaTypeResolver>
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
<!-- targetProject:生成PO类的位置 -->
<javaModelGenerator targetPackage="com.dqcgm.springbootmybatis.pojo"
targetProject=".\src\main\java">
<!-- enableSubPackages:是否让schema作为包的后缀 -->
<property name="enableSubPackages" value="false"/>
<!-- 从数据库返回的值被清理前后的空格 -->
<property name="trimStrings" value="true"/>
</javaModelGenerator>
<!-- targetProject:mapper映射文件生成的位置 -->
<sqlMapGenerator targetPackage="com.dqcgm.springbootmybatis.mapper"
targetProject=".\src\main\java">
<!-- enableSubPackages:是否让schema作为包的后缀 -->
<property name="enableSubPackages" value="false"/>
</sqlMapGenerator>
<!-- targetPackage：mapper接口生成的位置 -->
<javaClientGenerator type="XMLMAPPER"
targetPackage="com.dqcgm.springbootmybatis.mapper"
targetProject=".\src\main\java">
<!-- enableSubPackages:是否让schema作为包的后缀 -->
<property name="enableSubPackages" value="false"/>
</javaClientGenerator>
<!-- 指定数据库表 -->
<table schema="" tableName="users"></table>
</context>
</generatorConfiguration>
2.添加 generator 配置文件的 DTD 文件
3.运行 generator 插件生成代码
3.配置资源拷贝插件
1.修改启动类添加@MapperScan 注解
@SpringBootApplication
@MapperScan("com.dqcgm.springbootmybatis.mapper")//指定扫描接口与映射配置文件的包名
public class SpringbootmybatisApplication {
public static void main(String[] args) {
SpringApplication.run(SpringbootmybatisApplication.class, args);
}
}
4.MyBatis 的其他配置项
mybatis:
#扫描 classpath 中 mapper 目录下的映射配置文件，针对于映射配置文件放 到了 resources 目录下
mapper-locations: classpath:/mapper/*.xml
#定义包别名，使用 pojo 时可以直接使用 pojo 的类型名称不用加包名
type-aliases-package: com.dqcgm.springbootmybatis.pojo
5.添加用户功能
1.创建页面
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html xmlns:th="http://www.thymeleaf.org">
<link rel="shortcut icon" href="../resources/favicon.ico" th:href="@{/static/favicon.ico}"/>
<head>
<title>地球村公民首页</title>
</head>
<body>
<form th:action="@{/user/addUser}" method="post">
<input type="text" name="username"><br/>
<input type="text" name="usersex"><br/>
<input type="submit" value="OK"/>
</form>
</body>
</html>
2.创建 Controller
1.PageController
@Controller
public class PageController {
/**
* 页面跳转方法
*/
@RequestMapping("/{page}")
public String showPage(@PathVariable String page) {
return page;
}
}
2.UsersController
@Controller
@RequestMapping("/user")
public class UsersController {
@Autowired
private UsersService usersService;
/**
* 添加用户
*/
@PostMapping("/addUser")
public String addUsers(Users users) {
try {
this.usersService.addUsers(users);
} catch (Exception e) {
e.printStackTrace();
return "error";
}
return "redirect:/ok";
}
}
3.创建 Service
@Service
public class UsersServiceImpl implements UsersService {
@Autowired
private UsersMapper usersMapper;
/**
* 添加用户
*
* @param users
*/
@Override
@Transactional
public void addUsers(Users users) {
this.usersMapper.insert(users);
}
}
6.查询用户功能
1.修改 UsersController
@GetMapping("/findUserAll")
public String findUserAll(Model model) {
try {
List<Users> list = this.usersService.findUserAll();
model.addAttribute("list", list);
} catch (Exception e) {
e.printStackTrace();
return "error";
}
return "showUsers";
}
2.修改业务层
@Override
public List<Users> findUserAll() {
UsersExample example = new UsersExample();
return this.usersMapper.selectByExample(example);
}
3.创建页面显示查询结果
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html xmlns:th="http://www.thymeleaf.org">
<link rel="shortcut icon" href="../resources/favicon.ico" th:href="@{/static/favicon.ico}"/>
<head>
<title>地球村公民首页</title>
</head>
<body>
<table border="1" align="center">
<tr>
<th>用户ID</th>
<th>用户姓名</th>
<th>用户性别</th>
<th>操作</th>
</tr>
<tr th:each="u : ${list}">
<td th:text="${u.userid}"></td>
<td th:text="${u.username}"></td>
<td th:text="${u.usersex}"></td>
<td>
<a th:href="@{/user/preUpdateUser(id=${u.userid})}">修改</a>
<a th:href="@{/user/deleteUser(id=${u.userid})}">删除</a>
</td>
</tr>
</table>
</body>
</html>
7.更新用户功能
1.预更新用户查询
1.修改 UsersController
@GetMapping("/preUpdateUser")
public String preUpdateUser(Integer id, Model model) {
try {
Users user = this.usersService.preUpdateUsers(id);
model.addAttribute("user", user);
} catch (Exception e) {
e.printStackTrace();
return "error";
}
return "updateUser";
}
2.修改业务层
@Override
public Users preUpdateUsers(Integer id) {
return this.usersMapper.selectByPrimaryKey(id);
}
3.创建更新用户页面
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html xmlns:th="http://www.thymeleaf.org">
<link rel="shortcut icon" href="../resources/favicon.ico" th:href="@{/static/favicon.ico}"/>
<head>
<title>地球村公民</title>
</head>
<body>
<form th:action="@{/user/updateUser}" method="post">
<input type="hidden" name="userid" th:value="${user.userid}"/>
<input type="text" name="username" th:value="${user.username}"><br/>
<input type="text" name="usersex" th:value="${user.usersex}"><br/>
<input type="submit" value="OK"/>
</form>
</body>
</html>
2.更新用户操作
1.修改 UsersController
@PostMapping("/updateUser")
public String updateUser(Users users) {
try {
this.usersService.modifyUsers(users);
} catch (Exception e) {
e.printStackTrace();
return "error";
}
return "redirect:/ok";
}
2.修改业务层
@Override
@Transactional
public void modifyUsers(Users users) {
this.usersMapper.updateByPrimaryKey(users);
}
8.删除用户功能
1.修改 UsersController
@GetMapping("/deleteUser")
public String deleteUser(Integer id) {
try {
this.usersService.dropUsersById(id);
} catch (Exception e) {
e.printStackTrace();
return "error";
}
return "redirect:/ok";
}
2.修改业务层
@Override
@Transactional
public void dropUsersById(Integer id) {
this.usersMapper.deleteByPrimaryKey(id);
}