标签：salary HibernateUtil obj 语法 002 session hql Test null
1、
package cn.jbit.hibernatedemo.test;
import java.util.Iterator;
import java.util.List;
import org.hibernate.*;
import org.junit.Test;
import cn.jbit.hibernatedemo.dao.HibernateUtil;
import cn.jbit.hibernatedemo.entity.DeptSalary;
public class Eg {
/**
* 统计部门个数。
*/
@Test
public void egDept() {
Session session = null;
try {
// 获取session
session = HibernateUtil.currentSession();
Long count = (Long) session.createQuery(
"select count(*) from Dept d").uniqueResult();
System.out.println(count);
} catch (Exception e) {
e.printStackTrace();
} finally {
// 关闭session
HibernateUtil.closeSession();
}
}
/**
* 统计员工工资。
*/
@Test
public void egEmp() {
Session session = null;
try {
// 获取session
session = HibernateUtil.currentSession();
Double salarySum = (Double) session.createQuery(
"select sum(e.salary) from Emp e").uniqueResult();
System.out.println(salarySum);
} catch (Exception e) {
e.printStackTrace();
} finally {
// 关闭session
HibernateUtil.closeSession();
}
}
/**
* 统计员工最低工资。
*/
@Test
public void egEmpMinSalary() {
Session session = null;
try {
// 获取session
session = HibernateUtil.currentSession();
Double salary = (Double) session.createQuery(
"select min(e.salary) from Emp e").uniqueResult();
System.out.println(salary);
} catch (Exception e) {
e.printStackTrace();
} finally {
// 关闭session
HibernateUtil.closeSession();
}
}
/**
* 统计员工最高工资。
*/
@Test
public void egEmpMaxSalary() {
Session session = null;
try {
// 获取session
session = HibernateUtil.currentSession();
Double salary = (Double) session.createQuery(
"select max(e.salary) from Emp e").uniqueResult();
System.out.println(salary);
} catch (Exception e) {
e.printStackTrace();
} finally {
// 关闭session
HibernateUtil.closeSession();
}
}
/**
* 统计员工平均工资。
*/
@Test
public void egEmpAvgSalary() {
Session session = null;
try {
// 获取session
session = HibernateUtil.currentSession();
Double salary = (Double) session.createQuery(
"select avg(e.salary) from Emp e").uniqueResult();
System.out.println(salary);
} catch (Exception e) {
e.printStackTrace();
} finally {
// 关闭session
HibernateUtil.closeSession();
}
}
/**
* 统计最低工资、最高工资以及平均工资。
*/
@Test
public void egEmpSalary() {
Session session = null;
try {
// 获取session
session = HibernateUtil.currentSession();
Object[] salarys = (Object[]) session.createQuery(
"select min(salary),max(salary),avg(salary) from Emp")
.uniqueResult();
System.out
.println(salarys[0] + "," + salarys[1] + "," + salarys[2]);
} catch (Exception e) {
e.printStackTrace();
} finally {
// 关闭session
HibernateUtil.closeSession();
}
}
/**
* 统计员工职位个数。
*/
@Test
public void egJobEmp() {
Session session = null;
try {
// 获取session
session = HibernateUtil.currentSession();
Object count = session.createQuery(
"select count(distinct job) from Emp ").uniqueResult();
System.out.println(count.getClass().getName());
} catch (Exception e) {
e.printStackTrace();
} finally {
// 关闭session
HibernateUtil.closeSession();
}
}
/**
* 按职位统计员工个数。
*/
@Test
public void eg1() {
Session session = null;
try {
// 获取session
session = HibernateUtil.currentSession();
List<Object[]> list = session.createQuery(
"select job,count(e) from Emp e group by job").list();
for (Object[] obj : list)
System.out.println(obj[0] + "," + obj[1]);
} catch (Exception e) {
e.printStackTrace();
} finally {
// 关闭session
HibernateUtil.closeSession();
}
}
/**
* 统计各个部门的平均工资
*/
@Test
public void eg2() {
Session session = null;
try {
// 获取session
session = HibernateUtil.currentSession();
Iterator<Object[]> it = session
.createQuery(
"select e.dept.deptName,avg(e.salary) from Emp e group by e.dept.deptName")
.list().iterator();
Object[] obj = null;
while (it.hasNext()) {
obj = it.next();
System.out.println(obj[0] + "," + obj[1]);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
// 关闭session
HibernateUtil.closeSession();
}
}
/**
* 统计各个职位的最低工资和最高工资
*/
@Test
public void eg3() {
Session session = null;
try {
// 获取session
session = HibernateUtil.currentSession();
Iterator<Object[]> it = session
.createQuery(
"select job,min(salary),max(salary) from Emp group by job")
.list().iterator();
Object[] obj = null;
while (it.hasNext()) {
obj = it.next();
System.out.println(obj[0] + "," + obj[1] + "," + obj[2]);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
// 关闭session
HibernateUtil.closeSession();
}
}
/**
* 统计各个部门平均工资高于4000元的部门名称，打印部门名称、部门平均工资
*/
@Test
public void eg4() {
Session session = null;
try {
// 获取session
session = HibernateUtil.currentSession();
Iterator<Object[]> it = session
.createQuery(
"select e.dept.deptName,avg(e.salary) from Emp "
+ "e group by e.dept.deptName having avg(e.salary)>4000")
.list().iterator();
Object[] obj = null;
while (it.hasNext()) {
obj = it.next();
System.out.println(obj[0] + "," + obj[1]);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
// 关闭session
HibernateUtil.closeSession();
}
}
/**
* 统计各个部门平均工资高于4000元的部门名称，打印部门名称、部门平均工资，使用JavaBean封装查询结果
*/
@Test
public void eg4JavaBean() {
Session session = null;
try {
// 获取session
session = HibernateUtil.currentSession();
Iterator<DeptSalary> it = session
.createQuery(
"select new cn.jbit.hibernatedemo.entity.DeptSalary(e.dept.deptName,avg(e.salary))"
+ " from Emp e group by e.dept.deptName having avg(e.salary)>4000")
.list().iterator();
DeptSalary deptSalary = null;
while (it.hasNext()) {
deptSalary = it.next();
System.out.println(deptSalary.getDeptName() + ","
+ deptSalary.getAvgSalary());
}
} catch (Exception e) {
e.printStackTrace();
} finally {
// 关闭session
HibernateUtil.closeSession();
}
}
}
标签：salary,HibernateUtil,obj,语法,002,session,hql,Test,null 来源： https://www.cnblogs.com/syjp/p/11078764.html
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