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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;
添加pom文件
4.0.0 com.lynch.springboot spring-boot-mybatis-annotation 0.0.1-SNAPSHOT org.springframework.boot spring-boot-starter-parent 1.5.10.RELEASE UTF-8 1.8 org.springframework.boot spring-boot-starter org.springframework.boot spring-boot-starter-test test org.springframework.boot spring-boot-starter-web org.mybatis.spring.boot mybatis-spring-boot-starter 1.3.2 com.github.pagehelper pagehelper-spring-boot-starter 1.1.1 mysql mysql-connector-java org.springframework.boot spring-boot-devtools true org.springframework.boot spring-boot-maven-plugin
application.properties 添加相关配置
#mybatis.type-aliases-package=com.lynch.entityspring.datasource.driverClassName = com.mysql.jdbc.Driverspring.datasource.url = jdbc:mysql://192.168.1.149:3306/aa?useUnicode=true&characterEncoding=utf-8&useSSL=falsespring.datasource.username = rootspring.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。
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 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 userList); @SelectProvider(type = UserProvider.class, method = "queryUser") @Results({ @Result(property = "sex", column = "sex", javaType = SexEnum.class), @Result(property = "nickName", column = "nick_name") }) public List 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 userList = (List )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); 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)@SpringBootTestpublic class UserMapperTest { @Autowired private UserMapper userMapper; @Test public 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); } @Test public void batchInsert() throws Exception { List userList = new ArrayList (); 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)); } @Test public void getAll() throws Exception { List users = userMapper.getAll(); System.out.println(users.toString()); } @Test public void testUpdate() throws Exception { UserEntity user = userMapper.getOne(45L); System.out.println(user.toString()); user.setNickName("neo"); user.setSex(SexEnum.WOMAN); userMapper.update(user); } @Test public void queryUser() throws Exception { UserEntity user = new UserEntity(); user.setUsername("l"); System.out.println(userMapper.queryUser(user)); } @Test public void updateUser() throws Exception { UserEntity user = new UserEntity(); user.setId(45L); user.setNickName("aaa"); System.out.println(userMapper.updateUser(user)); }} 转载地址：http://zzpqb.baihongyu.com/