关于Mybatis-plus的使用请参考官网：https://mp.baomidou.com/
官方有提供mybatis-plus和springboot整合的demo：https://gitee.com/baomidou/mybatisplus-spring-boot
1 添加mybatis-plus相关依赖
第二个是生成器依赖，第三个是默认的引擎velocity
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.3.1.tmp</version>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-generator</artifactId>
<version>3.3.1.tmp</version>
</dependency>
<dependency>
<groupId>org.apache.velocity</groupId>
<artifactId>velocity-engine-core</artifactId>
<version>2.2</version>
</dependency>2 配置application.yml
如果代码生成器生成的实体没有id的话，不要设置id-type:auto
mybatis-plus:
global-config:
db-config:
#id-type: auto
table-underline: true
logic-delete-value: 1 # 逻辑已删除值(默认为 1)
logic-not-delete-value: 0 # 逻辑未删除值(默认为 0)
mapper-locations: classpath:/mapper/*.xml
configuration:
log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
type-aliases-package: com.lane.entity3 代码生成器
可以自动生成entity、controller、service、mapper
public class CodeGenerator {
/**
* <p>
* 读取控制台内容
* </p>
*/
public static String scanner(String tip) {
Scanner scanner = new Scanner(System.in);
StringBuilder help = new StringBuilder();
help.append("请输入" + tip + "：");
System.out.println(help.toString());
if (scanner.hasNext()) {
String ipt = scanner.next();
if (StringUtils.isNotEmpty(ipt)) {
return ipt;
}
}
throw new MybatisPlusException("请输入正确的" + tip + "！");
}
public static void main(String[] args) {
// 代码生成器
AutoGenerator mpg = new AutoGenerator();
// 全局配置
GlobalConfig gc = new GlobalConfig();
String projectPath = System.getProperty("user.dir");
gc.setOutputDir(projectPath + "/src/main/java");
gc.setAuthor("lane");
gc.setOpen(false);
// gc.setSwagger2(true); 实体属性 Swagger2 注解
mpg.setGlobalConfig(gc);
// 数据源配置
DataSourceConfig dsc = new DataSourceConfig();
dsc.setUrl("jdbc:mysql://localhost:3306/mybatis?serverTimezone=UTC&userUnicode=true&characterEncoding=utf-8");
// dsc.setSchemaName("public");
dsc.setDriverName("com.mysql.cj.jdbc.Driver");
dsc.setUsername(" ");
dsc.setPassword(" ");
mpg.setDataSource(dsc);
// 包配置
PackageConfig pc = new PackageConfig();
pc.setModuleName(scanner("模块名"));
pc.setParent("com");
mpg.setPackageInfo(pc);
// 自定义配置
InjectionConfig cfg = new InjectionConfig() {
@Override
public void initMap() {
// to do nothing
}
};
// 如果模板引擎是 velocity
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！！
return projectPath + "/src/main/java/com/" + pc.getModuleName()+"/mapper"
+ "/" + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML;
}
});
/*
cfg.setFileCreate(new IFileCreate() {
@Override
public boolean isCreate(ConfigBuilder configBuilder, FileType fileType, String filePath) {
// 判断自定义文件夹是否需要创建
checkDir("调用默认方法创建的目录");
return false;
}
});
*/
cfg.setFileOutConfigList(focList);
mpg.setCfg(cfg);
// 配置模板
TemplateConfig templateConfig = new TemplateConfig();
// 配置自定义输出模板
//指定自定义模板路径，注意不要带上.ftl/.vm, 会根据使用的模板引擎自动识别
// templateConfig.setEntity("templates/entity2.java");
// templateConfig.setService();
// templateConfig.setController();
templateConfig.setXml(null);
mpg.setTemplate(templateConfig);
// 策略配置
StrategyConfig strategy = new StrategyConfig();
strategy.setNaming(NamingStrategy.underline_to_camel);
strategy.setColumnNaming(NamingStrategy.underline_to_camel);
// strategy.setSuperEntityClass("你自己的父类实体,没有就不用设置!");
strategy.setEntityLombokModel(true);
strategy.setRestControllerStyle(true);
// 公共父类
//strategy.setSuperControllerClass("你自己的父类控制器,没有就不用设置!");
// 写于父类中的公共字段
//strategy.setSuperEntityColumns("id");
strategy.setInclude(scanner("表名，多个英文逗号分割").split(","));
strategy.setControllerMappingHyphenStyle(true);
strategy.setTablePrefix(pc.getModuleName() + "_");
mpg.setStrategy(strategy);
//mpg.setTemplateEngine(new FreemarkerTemplateEngine());
mpg.execute();
}
}4 分页插件配置
@Configuration
public class MyBatisPlusConfig {
/**
* mybatis-plus分页插件
*/
@Bean
public PaginationInterceptor paginationInterceptor() {
PaginationInterceptor paginationInterceptor = new PaginationInterceptor();
return paginationInterceptor;
}
}
5 实现增删查改
mybatis-plus提供了2个CRUD接口，一个是mapper 接口，一个是service接口，下面代码基于service.
https://mp.baomidou.com/guide/crud-interface.html#update
代码生成器根据我的user表生成的user实体：User(id int,name String,pwd String)
controller：
@RestController
@RequestMapping("/lane")
public class UserController {
@Resource
private UserMapper userMapper;
@Autowired
private IUserService userService;
//增
@RequestMapping("/addUser/{id}/{name}/{pwd}")
public String addUser(@PathVariable("id") int id,@PathVariable("name") String name,@PathVariable("pwd") String pwd)
{
User user=new User(id,name,pwd);
userService.save(user);
return "添加成功";
}
//删
@RequestMapping("/deleteUser/{id}")
public String deleteUser(@PathVariable("id") int id) {
userService.removeById(id);
return "删除成功";
}
//改
@RequestMapping("/updateUser/{id}/{name}/{pwd}")
public String updateUser(@PathVariable("id") int id,@PathVariable("name") String name,@PathVariable("pwd") String pwd)
{
User user=new User(id,name,pwd);
userService.updateById(user);
return "更新成功";
}
//查
@RequestMapping("/queryUserById/{id}")
public User getUser(@PathVariable("id") int id)
{
User user=userService.getById(id);
return user;
}
//条件查询
@RequestMapping("/queryUserCondition/{low}/{high}")
public List<User> queryUserCondition(@PathVariable("low") int low,@PathVariable("high") int high) {
QueryWrapper<User> queryWrapper = new QueryWrapper<>();
queryWrapper.ge("id", low).le("id",high);
List<User> list=userService.list(queryWrapper);
return list;
}
//分页查询
@RequestMapping("/page/{current}/{size}")
public List<User> getPage(@PathVariable("current") int current,@PathVariable("size") int size)
{
Map<String,Object> map = new HashMap<>();
QueryWrapper<User> queryWrapper = new QueryWrapper<>();
queryWrapper.orderByDesc("id");//按id降序
Page<User> page = new Page<>(current,size); // 查询第current页，每页大小为size
IPage<User> iPage = userMapper.selectPage(page,queryWrapper);
return iPage.getRecords();
}
}
