SpringBoot集成Mybatis(0配置注解版)

Mybatis初期使用比较麻烦，需要各种配置文件、实体类、dao层映射关联、还有一大推其它配置。当然Mybatis也发现了这种弊端，初期开发了generator可以根据表结构自动生成实体类、配置文件和dao层代码，可以减轻一部分开发量；后期也进行了大量的优化可以使用注解了，自动管理dao层和配置文件等，发展到最顶端就是今天要讲的这种模式，mybatis-spring-boot-starter就是springboot+mybatis完全注解不用任何配置文件，就可以简单配置轻松上手。

mybatis-spring-boot-starter主要有两种解决方案，一种是使用注解解决一切问题，一种是简化后的老传统。

以注解版的方式进行讲解。

users表结构

CREATE TABLE `users` (`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '主键id',`username` varchar(32) DEFAULT NULL COMMENT '用户名',`password` varchar(32) DEFAULT NULL COMMENT '密码',`sex` varchar(32) DEFAULT NULL,`nick_name` varchar(32) DEFAULT NULL,PRIMARY KEY (`id`),UNIQUE KEY `username` (`username`) USING HASH
) ENGINE=InnoDB AUTO_INCREMENT=39 DEFAULT CHARSET=utf8;

1、添加pom文件

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.lynch.springboot</groupId><artifactId>spring-boot-mybatis-annotation</artifactId><version>0.0.1-SNAPSHOT</version><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.5.10.RELEASE</version></parent><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>1.3.2</version></dependency><!-- mybatis分页插件 --><dependency><groupId>com.github.pagehelper</groupId><artifactId>pagehelper-spring-boot-starter</artifactId><version>1.1.1</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-devtools</artifactId><optional>true</optional></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build>
</project>

2、application.properties 添加相关配置

#mybatis.type-aliases-package=com.lynch.entityspring.datasource.driverClassName = com.mysql.jdbc.Driver
spring.datasource.url = jdbc:mysql://192.168.1.149:3306/aa?useUnicode=true&characterEncoding=utf-8&useSSL=false
spring.datasource.username = root
spring.datasource.password = attack

springboot会自动加载spring.datasource.*相关配置，数据源就会自动注入到sqlSessionFactory中，sqlSessionFactory会自动注入到Mapper中，对于开发人员不用管，直接拿来使用即可。

在启动类中添加对mapper包扫描@MapperScan

package com.lynch;import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication
@MapperScan("com.lynch.mapper")
public class Application {public static void main(String[] args) {SpringApplication.run(Application.class, args);}
}

或者直接在Mapper类上面添加注解@Mapper，建议使用上面那种，不然每个mapper加个注解也挺麻烦的。

3、开发Mapper

package com.lynch.mapper;import java.util.List;import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.InsertProvider;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Result;
import org.apache.ibatis.annotations.Results;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.SelectProvider;
import org.apache.ibatis.annotations.Update;
import org.apache.ibatis.annotations.UpdateProvider;import com.lynch.entity.UserEntity;
import com.lynch.enums.SexEnum;public interface UserMapper {@Select("SELECT * FROM users")@Results({ @Result(property = "sex", column = "sex", javaType = SexEnum.class),@Result(property = "nickName", column = "nick_name") })List<UserEntity> getAll();@Select("SELECT * FROM users WHERE id = #{id}")@Results({ @Result(property = "sex", column = "sex", javaType = SexEnum.class),@Result(property = "nickName", column = "nick_name") })UserEntity getOne(Long id);@Insert("insert into users(username,password,sex) values(#{username}, #{password}, #{sex})")int insert(UserEntity user);@Update("UPDATE users SET userName=#{username},nick_name=#{nickName} WHERE id =#{id}")void update(UserEntity user);@Delete("DELETE FROM users WHERE id =#{id}")void delete(Long id);@InsertProvider(type=UserProvider.class, method = "batchInsert")int batchInsert(@Param("userList")List<UserEntity> userList);@SelectProvider(type = UserProvider.class, method = "queryUser")@Results({ @Result(property = "sex", column = "sex", javaType = SexEnum.class),@Result(property = "nickName", column = "nick_name") })public List<UserEntity> queryUser(UserEntity user);@UpdateProvider(type = UserProvider.class, method = "updateUser")public int updateUser(@Param("U")UserEntity user);
}

package com.lynch.mapper;import java.util.List;
import java.util.Map;import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.jdbc.SQL;import com.github.pagehelper.util.StringUtil;
import com.lynch.entity.UserEntity;/*** 利用@Provider实现动态SQL* * @author Lynch**/
public class UserProvider {public String queryUser(UserEntity user) {StringBuffer sql = new StringBuffer("select * from users where 1=1 ");if(StringUtil.isNotEmpty(user.getUsername())) {sql.append(String.format("and username like '%s'", "%"+user.getUsername()+"%"));}return sql.toString();}public String batchInsert(Map map) {List<UserEntity> userList = (List<UserEntity>)map.get("userList");StringBuffer sql = new StringBuffer("insert into users (username,password) values ");for(UserEntity user : userList) {sql.append(String.format("('%s', '%s'),", user.getUsername(), user.getPassword()));}sql = sql.deleteCharAt(sql.length() -1);System.out.println(sql.toString());return sql.toString();}public String updateUser(@Param("U")UserEntity user) {SQL sql = new SQL(){{UPDATE("users");if (StringUtil.isNotEmpty(user.getNickName())){SET("nick_name = #{U.nickName}");}WHERE("id = #{U.id}");}};return sql.toString();}}

注意，使用#符号和$符号的不同：

// This example creates a prepared statement, something like select * from teacher where name = ?;
@Select("Select * from teacher where name = #{name}")
Teacher selectTeachForGivenName(@Param("name") String name);// This example creates n inlined statement, something like select * from teacher where name = 'someName';
@Select("Select * from teacher where name = '${name}'")
Teacher selectTeachForGivenName(@Param("name") String name);

4、单元测试

package com.lynch.mapper;import java.util.ArrayList;
import java.util.List;import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;import com.lynch.entity.UserEntity;
import com.lynch.enums.SexEnum;@RunWith(SpringRunner.class)
@SpringBootTest
public class UserMapperTest {@Autowiredprivate UserMapper userMapper;@Testpublic void insert() throws Exception {int result = 0;try {result = userMapper.insert(new UserEntity("lisi", "123456", SexEnum.MAN));} catch (Exception e) {System.out.println(e.getMessage().indexOf("ConstraintViolationException"));}System.out.println("result=" + result);}@Testpublic void batchInsert() throws Exception {List<UserEntity> userList = new ArrayList<UserEntity>();userList.add(new UserEntity("a","a",SexEnum.MAN));userList.add(new UserEntity("c","b",SexEnum.MAN));userList.add(new UserEntity("b","b",SexEnum.WOMAN));System.out.println("result=" + userMapper.batchInsert(userList)); }@Testpublic void getAll() throws Exception {List<UserEntity> users = userMapper.getAll();System.out.println(users.toString());}@Testpublic void testUpdate() throws Exception {UserEntity user = userMapper.getOne(45L);System.out.println(user.toString());user.setNickName("neo");user.setSex(SexEnum.WOMAN);userMapper.update(user);}@Testpublic void queryUser() throws Exception {UserEntity user = new UserEntity();user.setUsername("l");System.out.println(userMapper.queryUser(user)); }@Testpublic void updateUser() throws Exception {UserEntity user = new UserEntity();user.setId(45L);user.setNickName("aaa");System.out.println(userMapper.updateUser(user)); }}

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