1.引入mybatis-plus依赖及相关依赖:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--mybatis-plus和mybatis依赖-->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.1.1</version>
</dependency>
<!--代码生成器所需依赖-->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-generator</artifactId>
<version>3.1.1</version>
<!--mybatis-plus代码生成所需模板,项目业务中不需要-->
<dependency>
<groupId>org.apache.velocity</groupId>
<artifactId>velocity</artifactId>
<version>1.7</version>
</dependency>
<!--thymeleaf模板引擎-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<!--MySQL数据库驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<!--druid数据源-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.10</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependency>
2.创建表并初始化测试数据:
DROP TABLE IF EXISTS user;
CREATE TABLE user (
id BIGINT(20) NOT NULL COMMENT '主键ID',
name VARCHAR(30) DEFAULT NULL COMMENT '姓名',
age INT(11) DEFAULT NULL COMMENT '年龄',
email VARCHAR(50) DEFAULT NULL COMMENT '邮箱',
PRIMARY KEY (id)
);
DELETE FROM user;
INSERT INTO user (id, name, age, email) VALUES
(1, 'Jone', 18, '[email protected]'),
(2, 'Jack', 20, '[email protected]'),
(3, 'Tom', 28, '[email protected]'),
(4, 'Sandy', 21, '[email protected]'),
(5, 'Billie', 24, '[email protected]');
3.编写代码生成器:
@Test
public void codeGenerator(){
//代码生成器对象
AutoGenerator mpg = new AutoGenerator();
//数据源配置
DataSourceConfig dataSourceConfig = new DataSourceConfig();
dataSourceConfig.setDriverName("com.mysql.cj.jdbc.Driver");
dataSourceConfig.setUrl("jdbc:mysql://localhost:3306/test?serverTimezone=GMT%2B8");
dataSourceConfig.setUsername("root");
dataSourceConfig.setPassword("root");
mpg.setDataSource(dataSourceConfig);
//包名配置
PackageConfig packageConfig = new PackageConfig();
//该配置会在mapper目录下生成xml目录保存xml文件,因在自定义配置中重新生成了可删除
packageConfig.setParent("com.example.mybatisplus");
mpg.setPackageInfo(packageConfig);
//策略配置
StrategyConfig strategyConfig = new StrategyConfig();
strategyConfig.setNaming(NamingStrategy.underline_to_camel);
strategyConfig.setColumnNaming(NamingStrategy.underline_to_camel);
strategyConfig.setControllerMappingHyphenStyle(true);
strategyConfig.setInclude("user"); //设置表名,多个以英文逗号分隔
mpg.setStrategy(strategyConfig);
//全局策略配置
GlobalConfig globalConfig = new GlobalConfig();
String projectPath = System.getProperty("user.dir");
globalConfig.setOutputDir(projectPath+"/src/main/java");
globalConfig.setOpen(false);
globalConfig.setAuthor("dengzhiming");
globalConfig.setServiceName("%sService");
mpg.setGlobalConfig(globalConfig);
// 自定义配置
InjectionConfig cfg = new InjectionConfig() {
@Override
public void initMap() {
// to do nothing
}
};
//如果模板引擎是velocity,默认模板引擎,需添加其依赖
String templatePath = "/templates/mapper.xml.vm";
// 自定义输出配置
List<FileOutConfig> focList = new ArrayList<>();
// 自定义配置会被优先输出
focList.add(new FileOutConfig(templatePath) {
@Override
public String outputFile(TableInfo tableInfo) {
// 自定义输出文件名,如果你Entity设置了前后缀、此处注意xml的名称会跟着发生变化
// 在/src/main/resources/mapper/目录下重新生成xml文件
return projectPath + "/src/main/resources/mapper/" +
tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML;
}
});
cfg.setFileOutConfigList(focList);
mpg.setCfg(cfg);
mpg.execute();
}
4.配置yml文件:
# 服务器项目根路径
server:
servlet:
context-path: /web
spring:
datasource:
druid:
#数据库访问配置，使用Druid数据源
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost:3306/test?serverTimezone=GMT%2B8
username: root
password: root
# 连接池配置
initial-size: 5
min-idle: 5
max-active: 20
# 连接等待超时时间
max-wait: 30000
# 配置检测可以关闭的空闲连接间隔时间(检测空闲连接的周期)
time-between-eviction-runs-millis: 60000
# 配置连接在池中的最小生存时间
min-evictable-idle-time-millis: 300000
validation-query: select '1' from dual
test-while-idle: true
test-on-borrow: false
test-on-return: false
# 打开PSCache，并且指定每个连接上PSCache的大小
pool-prepared-statements: true
max-open-prepared-statements: 20
max-pool-prepared-statement-per-connection-size: 20
# 配置监控统计拦截的filters,去掉后监控界面sql无法统计,'wall'用于防火墙
filters: stat,wall
# Spring监控AOP切入点，如x.y.z.service.*,配置多个英文逗号分隔
aop-patterns: com.springboot.service.*
# WebStatFilter配置
web-stat-filter:
enabled: true
# 添加过滤规则
url-pattern: /*
# 忽略过滤的格式
exclusions: '*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*'
# StatViewServlet配置
stat-view-servlet:
enabled: true
# 访问路径为/druid时,跳转到StatViewServlet
url-pattern: /druid/*
# 是否能够重置数据
reset-enable: false
# 需要账号密码才能访问控制台
login-username: admin
login-password: admin
# IP白名单
# allow: 127.0.0.1
# IP黑名单（共同存在时，deny优先于allow）
# deny: 192.168.1.218
# 配置StatFilter
filter:
stat:
log-slow-sql: true
mybatis-plus:
#指定MyBatis Mapper所对应的XML文件位置
mapper-locations: classpath:/mapper/*.xml
#启动时是否检查MyBatis XML文件的存在,默认不检查
checkConfigLocation: true
5.运行测试类中的代码生气方法,生成所需的基础代码;
6.在入口类上添加mybatis接口扫描注解:
@MapperScan("com.example.mybatisplus.mapper")
@SpringBootApplication
public class SpringBootMybatisPlusApplication {
public static void main(String[] args) {
SpringApplication.run(SpringBootMybatisPlusApplication.class, args);
}
}
7.测试:
[1]测试通用Service:
@Autowired
private UserService service;
@Test
public void testService(){
//User user = service.getOne(new QueryWrapper<User>().eq("id","1"));
User user = service.getById("1");
System.out.println(user);
}
[2]测试通用Mapper:
@Autowired
private UserMapper mapper;
@Test
public void testMapper(){
User user = mapper.selectOne(new QueryWrapper<User>().eq("id", "1"));
System.out.println(user);
}
[3]测试自定义SQL:
(1)在mapper接口中添加自定义方法:
public interface UserMapper extends BaseMapper<User> {
User findById(String id);
}
(2)在mapper xml文件中添加自定义SQL:
<select id="findById" resultType="com.example.mybatisplus.entity.User">
select * from user where id = #{id}
</select>
(3)测试:
@Test
public void testSql(){
User user = mapper.findById("2");
System.out.println(user);
}