MyBatis基於Spring-boot整合通用Mapper以及pagehelper分頁外掛（含原始碼下載）
阿新 • • 發佈：2019-01-01
配置
POM檔案
<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 同一環境1.5.7.RELEASE版本的Spring-boot會拋Caused by: java.lang.IllegalStateException: Cannot load driver class: com.mysql.jdbc.Driver異常，1.5.6.RELEASE以及1.5.5.RELEASE版本親測沒問題
application.properties配置檔案
#資料庫
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
#分頁外掛
pagehelper.helperDialect=mysql
pagehelper.reasonable=true
pagehelper.supportMethodsArguments=true
pagehelper.params=count=countSql
#log
logging.file=logger.log
logging.level.*=debug對映實體（省略欄位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;
/**
* 名稱
*/
@Column(name = "name")
private String name;
/**
* 年齡
*/
@Column(name = "age")
private Integer age;
/**
* 身份編號
*/
@Column(name = "card_no")
private Integer cardNo;
/**
* 生日
*/
@Column(name = "birthday")
private Date birthday;
}本地通用Mapper介面（繼承通用Mapper介面）
import tk.mybatis.mapper.common.Mapper;
import tk.mybatis.mapper.common.MySqlMapper;
public interface TkMapper<T> extends Mapper<T>, MySqlMapper<T> {
}Mapper介面：基本的增、刪、改、查方法
MySqlMapper：針對MySQL的額外補充介面，支援批量插入
業務介面（繼承“本地通用Mapper介面”）
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啟動類，@MapperScan僅掃描業務介面包，不能掃描本地通用Mapper介面包，否則報java.lang.ClassCastException: sun.reflect.generics.reflectiveObjects.TypeVariableImpl cannot be cast to java.lang.Class異常
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);
}
}單元測試
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)
@SpringBootTest
public class SpringBootMyBatisApplicationTests {
@Autowired
private UserMapper mapper;
// 插入一條新記錄
@Test
public void insertOne() {
User newUser = new User();
int cardNo = (int) (Math.random() * 10000000);
newUser.setAge(24);
newUser.setBirthday(new Date());
newUser.setName(cardNo + "使用者");
newUser.setCardNo(cardNo);
mapper.insertSelective(newUser);
System.out.println("插入成功");
}
// 批量插入記錄
@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 + "批量插入使用者");
newUser.setCardNo(cardNo);
recordList.add(newUser);
}
mapper.insertList(recordList);
System.out.println("批量插入成功");
}
// 根據唯一編號查詢使用者(通用Mapper查詢)
@Test
public void selectByCardNo() {
User paramBean = new User();
paramBean.setCardNo(6647403);
User dbUser = mapper.selectOne(paramBean);
if (dbUser != null) {
System.out.println("資料庫使用者(通用Mapper查詢)：" + dbUser.getName());
return;
}
System.out.println("查無此使用者");
}
// 根據唯一編號查詢使用者(XML查詢)
@Test
public void selectByCardNoByXml() {
User dbUser = mapper.selectByCardNo(6105967);
if (dbUser != null) {
System.out.println("資料庫使用者(XML查詢)：" + dbUser.getName());
return;
}
System.out.println("查無此使用者");
}
// 根據年齡查詢一組使用者
@Test
public void selectByAge() {
User paramBean = new User();
paramBean.setAge(24);
List<User> dbUserList = mapper.select(paramBean);
System.out.println("總共查詢數：" + dbUserList.size());
}
// 分頁查詢使用者
@Test
public void selectByPage() {
PageHelper.offsetPage(1, 5);
List<User> dbUserList = mapper.select(null);
for (User item : dbUserList) {
System.out.println("分頁使用者：" + item.getName());
}
}
// 更新使用者資訊
@Test
public void updateOneInfo() {
User paramBean = new User();
paramBean.setId(1);
paramBean.setAge(26);
mapper.updateByPrimaryKeySelective(paramBean);
System.out.println("更新成功");
}
}
整合通用Mapper可以像hibernate那樣“面向物件”進行資料庫操作了，pagehelper分頁也彌補了Mybatis本身不支援分頁機制的小缺陷；為Mybatis添這兩小外掛，你還在猶豫使用Mybatis或者Hibernate嗎？快擁抱Mybatis吧
（完）