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MyBatis基于Spring-boot集成通用Mapper以及pagehelper分页插件
发布时间：2018-05-24 编辑：小付 浏览（1029） 评论（0）
配置
POM文件
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.6.RELEASE</version> <relativePath /> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>tk.mybatis</groupId> <artifactId>mapper-spring-boot-starter</artifactId> <version>RELEASE</version> </dependency> <dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper-spring-boot-starter</artifactId> <version>RELEASE</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.1</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies>
同一环境1.5.7.RELEASE版本的Spring-boot
会抛Caused by: java.lang.IllegalStateException: Cannot load driver class: com.mysql.jdbc.Driver异常，1.5.6.RELEASE以及1.5.5.RELEASE版本亲测没问题
application.properties配置文件
#数据库 spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test spring.datasource.username=root spring.datasource.password=741852 spring.datasource.driver-class-name=com.mysql.jdbc.Driver #mybatis&&通用Mapper mybatis.type-aliases-package=com.karle.bean mybatis.mapper-locations=classpath:mapper/*.xml mapper.mappers=com.karle.tk.TkMapper mapper.identity=MYSQL #分页插件 pagehelper.helperDialect=mysql pagehelper.reasonable=true pagehelper.supportMethodsArguments=true pagehelper.params=count=countSql #log logging.file=logger.log logging.level.*=debug
映射实体（省略字段get、set）
import java.util.Date;import javax.persistence.Column;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
@Table(name = "user")
public class User {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
/**
* 名称
*/
@Column(name = "name")
private String name;
/**
* 年龄
*/
@Column(name = "age")
private Integer age;
/**
* 身份编号
*/
@Column(name = "card_no")
private Integer cardNo;
/**
* 生日
*/
@Column(name = "birthday")
private Date birthday;
}本地通用Mapper接口（继承通用Mapper接口）
import tk.mybatis.mapper.common.Mapper;
import tk.mybatis.mapper.common.MySqlMapper;
public interface TkMapper<T> extends Mapper<T>, MySqlMapper<T> {
//也可自己扩展
}Mapper接口：基本的增、删、改、查方法
MySqlMapper：针对MySQL的额外补充接口，支持批量插入
业务接口（继承“本地通用Mapper接口”）
import org.apache.ibatis.annotations.Param;
import com.karle.bean.User;
import com.karle.tk.TkMapper;
public interface UserMapper extends TkMapper<User> {
public User selectByCardNo(@Param("cardNo") int cardNo);
}Spring-boot启动类，@MapperScan仅扫描业务接口包，不能扫描本地通用Mapper接口包，
否则报
java.lang.ClassCastException: sun.reflect.generics.reflectiveObjects.TypeVariableImpl cannot be cast to java.lang.Class
异常
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
@MapperScan(basePackages = { "com.karle.mapper" })
public class SpringBootMyBatisApplication {
public static void main(String[] args) {
SpringApplication.run(SpringBootMyBatisApplication.class, args);
}
}单元测试
import java.util.ArrayList;
import java.util.Date;
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.github.pagehelper.PageHelper;
import com.karle.bean.User;
import com.karle.mapper.UserMapper;
@RunWith(SpringRunner.class)
@SpringBootTestpublic class SpringBootMyBatisApplicationTests {
@Autowired
private UserMapper mapper;
// 插入一条新记录
@Test
public void insertOne() {
User newUser = new User();
int cardNo = (int) (Math.random() * 10000000);
newUser.setAge(24);
newUser.setBirthday(new Date());
newUser.setName(cardNo + "用户");
newUser.setCardNo(cardNo);
mapper.insertSelective(newUser);
System.out.println("插入成功");
}
// 批量插入记录
@Test
public void insertMore() {
List<User> recordList = new ArrayList<User>();
for (int i = 0; i < 2; i++) {
User newUser = new User();
int cardNo = (int) (Math.random() * 10000000);
newUser.setAge(26);
newUser.setBirthday(new Date());
newUser.setName(cardNo + "批量插入用户");
newUser.setCardNo(cardNo);
recordList.add(newUser);
}
mapper.insertList(recordList);
System.out.println("批量插入成功");
}
// 根据唯一编号查询用户(通用Mapper查询)
@Test
public void selectByCardNo() {
User paramBean = new User();
paramBean.setCardNo(6647403);
User dbUser = mapper.selectOne(paramBean);
if (dbUser != null) {
System.out.println("数据库用户(通用Mapper查询)：" + dbUser.getName());
return;
}
System.out.println("查无此用户");
}
// 根据唯一编号查询用户(XML查询)
@Test
public void selectByCardNoByXml() {
User dbUser = mapper.selectByCardNo(6105967);
if (dbUser != null) {
System.out.println("数据库用户(XML查询)：" + dbUser.getName());
return;
}
System.out.println("查无此用户");
}
// 根据年龄查询一组用户
@Test
public void selectByAge() {
User paramBean = new User();
paramBean.setAge(24);
List<User> dbUserList = mapper.select(paramBean);
System.out.println("总共查询数：" + dbUserList.size());
}
// 分页查询用户
@Test
public void selectByPage() {
PageHelper.offsetPage(1, 5);
List<User> dbUserList = mapper.select(null);
for (User item : dbUserList) {
System.out.println("分页用户：" + item.getName());
}
}
// 更新用户信息
@Test
public void updateOneInfo() {
User paramBean = new User();
paramBean.setId(1);
paramBean.setAge(26);
mapper.updateByPrimaryKeySelective(paramBean);
System.out.println("更新成功");
}
}集成通用Mapper可以像hibernate那样“面向对象”进行数据库操作了，pagehelper分页也弥补了Mybatis本身不支持分页机制的小缺陷；为Mybatis添这两小插件，你还在犹豫使用Mybatis或者Hibernate吗？快拥抱Mybatis吧
（完）
Demo下载：http://download.csdn.net/download/qq_19260029/9982948
关键字词：MyBatis,Spring-boot,通用Mapper