Mybatis初期使用比較麻煩，需要各種配置文件、實體類、dao層映射關聯、還有一大推其它配置。當然Mybatis也發現了這種弊端，初期開發了generator可以根據表結構自動生成實體類、配置文件和dao層代碼，可以減輕一部分開發量；后期也進行了大量的優化可以使用注解了，自動管理dao層和配置文件等，發展到最頂端就是今天要講的這種模式，mybatis-spring-boot-starter就是springboot+mybatis完全注解不用任何配置文件，就可以簡單配置輕松上手。

mybatis-spring-boot-starter主要有兩種解決方案，一種是使用注解解決一切問題，一種是簡化后的老傳統。

以注解版的方式進行講解。

users表結構

CREATE TABLE `users` (`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '主鍵id',`username` varchar(32) DEFAULT NULL COMMENT '用戶名',`password` varchar(32) DEFAULT NULL COMMENT '密碼',`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;

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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分頁插件 --><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>

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2、application.properties 添加相關配置

#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會自動加載spring.datasource.*相關配置，數據源就會自動注入到sqlSessionFactory中，sqlSessionFactory會自動注入到Mapper中，對于開發人員不用管，直接拿來使用即可。

在啟動類中添加對mapper包掃描@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類上面添加注解@Mapper，建議使用上面那種，不然每個mapper加個注解也挺麻煩的。

3、開發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實現動態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();}}

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注意，使用#符號和$符號的不同：

// 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、單元測試

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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