spring boot 整合mybatis實現分頁功能的例項
阿新 • • 發佈:2018-12-06
1.匯入依賴
在你pom.xml檔案中新增如下整合
<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.ps</groupId> <artifactId>SPRING_BOOT_JSON</artifactId> <version>0.0.1-SNAPSHOT</version> <!-- 繼承預設值為Spring Boot --> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.17.RELEASE</version> </parent> <dependencies> <!-- 整合spring MVC --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- 整合mysql --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <!-- mysql驅動包 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> <!-- 阿里巴巴druid資料庫連線池 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>1.1.10</version> </dependency> <!-- 開發工具:修改java程式碼無須重新執行 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <optional>true</optional> </dependency> <!-- 分頁外掛 --> <dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper</artifactId> <version>4.1.6</version> </dependency> <dependency> <groupId>commons-lang</groupId> <artifactId>commons-lang</artifactId> <version>2.2</version> </dependency> <!-- 整合mybatis --> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.1.1</version> </dependency> </dependencies> </project>
2.程式碼
2.1:在你的main方法裡面加上如下配置:
import java.util.Properties; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.context.annotation.Bean; import com.github.pagehelper.PageHelper; @SpringBootApplication public class Main { public static void main(String[] args) throws Exception { SpringApplication.run(Main.class, args); } //配置mybatis的分頁外掛pageHelper @Bean public PageHelper pageHelper() { PageHelper pageHelper = new PageHelper(); Properties props = new Properties(); props.setProperty("dialect", "mysql"); // 表示支援從介面中讀取pageNum和pageSize props.setProperty("supportMethodsArguments", "true"); pageHelper.setProperties(props); return pageHelper; } }
解釋:@SpringBootApplication表示自動裝配;
也可以將你的pageHelper配置寫在帶有@Configuration的類中,這種類可以理解為spring boot的配置類
注意:所有的類要寫在main方法所在的類的包下,或者子包下,不然不能掃描;
2.2:建立一個數據庫中表的實體類
這個就不演示了,都是set,get方法
2.3:控制層
import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RestController; import com.pk.entity.Result; import com.pk.service.EmpService; @RestController public class EmpServlet{ @Autowired private EmpService service; @GetMapping(value = "/emps") public List<?> emps(String checkName,String page, String limit ){ Result result = null; try { // 這裡的checkName是指按名字查詢,1是指:頁數 ,2是指每頁展示的資料 result = service.queryEmps(checkName, "1", "2"); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } return result.getData(); } }
2.4:Service層
import java.util.List;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.github.pagehelper.PageInfo;
import com.pk.entity.Result;
import com.pk.mapper.EmpMapper;
import com.pk.service.EmpService;
import com.pk.entity.Emp;
@Service
public class EmpServiceImpl implements EmpService {
@Autowired
private EmpMapper empMapper;
public Result queryEmps(String checkName, String curPage, String pageNum) throws Exception {
int curPageIn = Integer.parseInt(curPage);
int pageNumIn = Integer.parseInt(pageNum);
if(StringUtils.isEmpty(checkName)) {
checkName = "";
}else {
curPageIn = 1;
}
List<Emp> queryEmps = empMapper.queryEmp("%"+checkName+"%", curPageIn, pageNumIn);
PageInfo<Emp> pi = new PageInfo<Emp>(queryEmps );
Result result = new Result();
result.setCode(0);
result.setCount((int) pi.getTotal());
result.setData(queryEmps);
return result;
}
}
2.5:表對映類
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import com.pk.entity.Emp;
@Mapper
public interface EmpMapper {
@Select("select empno,ename,job,hiredate,sal from emp where ename like #{0}")
public List<Emp> queryEmp(String checkName, @Param("pageNum")int startIndex, @Param("pageSize")int pageNumIn);
}
注意:
@Param(“pageNum”)和@Param(“pageSize”)是固定的,不能修改
通過@Mapper,直接在這裡寫sql語句
**2.6:**`application.properties`資原始檔的內容
server.port=8081
spring.datasource.url=jdbc:mysql://localhost:3306/m1dn
spring.datasource.username=root
spring.datasource.password=ps123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.druid.stat-view-servlet.login-username=druid