Spring Boot整合Mybatis及PageHelper实现分页查询
作者:互联网
1、导入jar包
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.4</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.github.pagehelper/pagehelper-spring-boot-starter -->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>1.2.12</version>
</dependency>
2、数据源及日志配置
spring:
datasource:
driver-class-name: oracle.jdbc.driver.OracleDriver
url: jdbc:oracle:thin:@localhost:1521:orcl
username: scott
password: scott
#开启SQL打印
logging:
level:
#单独指定包
org.silence.blog.mapper: debug
3、编写Mapper
@Repository
public interface EmpMapper {
@Select("select * from emp ")
List<Emp> queryList();
@Select("select * from emp where empno = #{empno}")
Emp queryByEmpNo(String empno);
}
4、测试
@SpringBootTest
class EmpMapperTest {
@Autowired
EmpMapper mapper;
@Test
void queryList() {
//设置查询页面
PageHelper.startPage(1, 6);
//执行查询
List<Emp> emps = mapper.queryList();
//构建PageInfo对象,将结果集传入
PageInfo<Emp> pageInfo = new PageInfo<Emp>(emps);
pageInfo.getList().forEach(System.out::println);
}
@Test
void queryByEmpNo() {
}
}
5、输出结果
2021-03-04 21:20:49.349 DEBUG 14456 --- [ main] o.s.b.mapper.EmpMapper.queryList_COUNT : ==> Preparing: SELECT count(0) FROM emp
2021-03-04 21:20:49.451 DEBUG 14456 --- [ main] o.s.b.mapper.EmpMapper.queryList_COUNT : ==> Parameters:
2021-03-04 21:20:49.513 DEBUG 14456 --- [ main] o.s.b.mapper.EmpMapper.queryList_COUNT : <== Total: 1
2021-03-04 21:20:49.515 DEBUG 14456 --- [ main] o.s.blog.mapper.EmpMapper.queryList : ==> Preparing: SELECT * FROM ( SELECT TMP_PAGE.*, ROWNUM ROW_ID FROM ( select * from emp ) TMP_PAGE) WHERE ROW_ID <= ? AND ROW_ID > ?
2021-03-04 21:20:49.517 DEBUG 14456 --- [ main] o.s.blog.mapper.EmpMapper.queryList : ==> Parameters: 6(Integer), 0(Integer)
2021-03-04 21:20:49.529 DEBUG 14456 --- [ main] o.s.blog.mapper.EmpMapper.queryList : <== Total: 6
Emp(empno=7369, ename=SMITH, job=CLERK, mgr=7902, hiredate=1980-12-17T00:00, sal=800, comm=null, deptno=20)
Emp(empno=7499, ename=ALLEN, job=SALESMAN, mgr=7698, hiredate=1981-02-20T00:00, sal=1600, comm=300, deptno=30)
Emp(empno=7521, ename=WARD, job=SALESMAN, mgr=7698, hiredate=1981-02-22T00:00, sal=1250, comm=500, deptno=30)
Emp(empno=7566, ename=JONES, job=MANAGER, mgr=7839, hiredate=1981-04-02T00:00, sal=2975, comm=null, deptno=20)
Emp(empno=7654, ename=MARTIN, job=SALESMAN, mgr=7698, hiredate=1981-09-28T00:00, sal=1250, comm=1400, deptno=30)
Emp(empno=7698, ename=BLAKE, job=MANAGER, mgr=7839, hiredate=1981-05-01T00:00, sal=2850, comm=null, deptno=30)
标签:mapper,20,21,03,Spring,Boot,queryList,PageHelper,EmpMapper 来源: https://www.cnblogs.com/wind-ranger/p/14483073.html