DeptTest.java
测试类：
先创建Session：
private Session session; private Transaction tx; @Before public void beforeMethod(){ session=new Configuration() .configure() .buildSessionFactory() .openSession(); }
关闭Session：
@After public void afterMethod() { if (session != null) { session.close(); } }
开始测试：
/**
* 测试简单查询
*/
@Test public void testMethod1() { //查询所有的部门 Criteria criteria=session.createCriteria(Dept.class); List<Dept> deptList=criteria.list(); for (Dept dept : deptList) { System.out.println("部门编号："+dept.getDeptno()); System.out.println("部门名称："+dept.getDname()); System.out.println("部门编地址："+dept.getLoc()); } }
查詢部门在山西吕梁的部门名称
//查询部门地址在山西吕梁的部门名称 @Test public void test2(){ List<Dept> deptList=session.createCriteria(Dept.class) .add(Restrictions.eq("loc", "山西吕梁")).list(); for (Dept dept : deptList) { System.out.println(dept.getDeptno()+","+dept.getDname()); } }
//查询工资高于5000的员工
@Test public void test3(){ List<Emp> empList=session .createCriteria(Emp.class) .add(Restrictions.gt("sal", 5000D)).list(); for (Emp emp : empList) { System.out.println(emp.getEname()+","+emp.getSal()); } }
//查询不属于任何部门的员工
@Test public void test4(){ List<Emp> empList=session.createCriteria(Emp.class) .add(Restrictions.isNull("dept")).list(); for (Emp emp : empList) { System.out.println(emp.getEname()); } }
//查询职位是CLERK的员工
//ignoreCase:不区分大小写
@Test public void test5(){ List<Emp> empList=session.createCriteria(Emp.class) .add(Restrictions.eq("job","ClERK").ignoreCase()) .list(); for (Emp emp : empList) { System.out.println(emp.getEname()+","+emp.getDept().getDname()); } }
/**
* in:等于列表中的某一个值
* not in:不等于列表中的任何一个值
* between 值1 and 值2：大于等于值1并且小于值2
* not between 值1 and 值2：小于值1或者大于值2
*/
//查询职位是ANALYST 或 SALESMAN 的员工
@Test public void test6(){ List jobList=new ArrayList(); jobList.add("SALESMAN"); jobList.add("ANALYST"); List<Emp> empoList=session.createCriteria(Emp.class) .add(Restrictions.in("job",jobList)) .list(); for (Emp emp : empoList) { System.out.println(emp.getEname()+","+emp.getJob()); } }
//查询工资在2000元到4000元的员工
@Test public void test7(){ List<Emp> empList=session.createCriteria(Emp.class) .add(Restrictions.between("sal", 2000D, 4000D)) .list(); for (Emp emp : empList) { System.out.println(emp.getEname()+","+emp.getSal()); } }
/**
* like:字符串模式匹配
* ilike：字符串木事匹配，忽略大小写
*/
//查询姓名中包括s的职位(like)
@Test public void test8(){ List<Emp> empList=session.createCriteria(Emp.class) .add(Restrictions.like("job","%s%")) .list(); for (Emp emp : empList) { System.out.println(emp.getEname()); } }
//查询姓名中包括s的职位(ilike)
@Test public void test9(){ List<Emp> empList=session.createCriteria(Emp.class) .add(Restrictions.ilike("job","%s%")) .list(); for (Emp emp : empList) { System.out.println(emp.getEname()); } }
/**
* MatchMode静态常量
* 1.MatchMode.STRART: 员工姓名以s开头
* 2.MatchMode.END： 员工姓名以s结尾
* 3.MatchMode.ANYWHERE 员工姓名中包含s
* 4.MatchMode.EXACT 员工姓名中等于s精确匹配
*/
//查询职位中包括s的职位
@Test public void test10(){ List<Emp> empList=session.createCriteria(Emp.class) .add(Restrictions.ilike("job","%s%",MatchMode.ANYWHERE)) .list(); for (Emp emp : empList) { System.out.println(emp.getJob()); } }
/**
*逻辑运算
*1.and:逻辑与
*2.or:逻辑或
*3.not:逻辑非
*/
//查询职位是accountant 或者是analyert的职位名称
@Test public void test11(){ List<Emp> empList=session.createCriteria(Emp.class) .add(Restrictions.or(Restrictions.eq("job", "analyert").ignoreCase(), Restrictions.eq("job","accountant").ignoreCase())) .list(); for (Emp emp : empList) { System.out.println(emp.getJob()); } }
//查询职位是accountant 或者是analyert 或者是 engineer的职位名称
@Test public void test12(){ List<Emp> empList=session.createCriteria(Emp.class) .add(Restrictions.disjunction() .add(Restrictions.eq("job", "analyert").ignoreCase()) .add(Restrictions.eq("job","accountant").ignoreCase()) .add(Restrictions.eq("job", "engineer").ignoreCase())) .list(); for (Emp emp : empList) { System.out.println(emp.getJob()); } }
/**
* 集合运算符
* 1. is empty:集合为空，不包含任何元素
* 2. is not empty：集合不为空
*/
//查询没有员工的部门
@Test public void test13(){ List<Dept> deptList=session.createCriteria(Dept.class) .add(Restrictions.isEmpty("emps")) .list(); for (Dept dept : deptList) { System.out.println(dept.getDname()); } }
/**
* 动态查询
* 条件见下：（条件类：EmpCondition）
* 1.job是engineer
* 2.sal大于2000
* 3.入职时间在2006年12月31日到2008年12月31日之前
*/
@Test public void test14(){ SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd"); EmpCondition empCondition=new EmpCondition(); try { empCondition.setJob("engineer"); empCondition.setSal(2000D); String hiredateStart="2006-12-31"; String hiredateEnd="2008-12-31"; Date hiredateStart1=format.parse(hiredateStart); Date hiredateEnd1=format.parse(hiredateEnd); empCondition.setHiredateStart(hiredateStart1); empCondition.setHiredateEnd(hiredateEnd1); } catch (ParseException e) { // TODO Auto-generated catch block e.printStackTrace(); }
//添加动态查询的条件
Criteria criteria=session.createCriteria(Emp.class); if(empCondition.getJob()!=null){ criteria.add(Restrictions.ilike("job", empCondition.getJob())); } if(empCondition.getSal()!=null){ criteria.add(Restrictions.gt("sal",empCondition.getSal())); } if(empCondition.getHiredateStart()!=null){ criteria.add(Restrictions.ge("hiredate",empCondition.getHiredateStart())); } if(empCondition.getHiredateEnd()!=null){ criteria.add(Restrictions.le("hiredate",empCondition.getHiredateEnd())); } //输出 List<Emp>emplist=criteria.list(); for (Emp emp : emplist) { System.err.println(emp.getEname()+","+emp.getJob()+","+emp.getSal()+","+emp.getHiredate()); } }
/**
* 分页查询
*/
//分页查询部门是SALESMAN 的所有员工
//并且工资降序
//显示总页数，总记录数，当前页号
@Test public void test15(){ Criteria criteria =session.createCriteria(Emp.class) .add(Restrictions.eq("job", "SALESMAN").ignoreCase()) .setProjection(Projections.count("empno")); //获得总记录数 Integer count=(Integer)criteria.uniqueResult(); //分页 int pageSize=2; int pageIndex=1; int totalPage=count%pageSize==0?count/pageSize:(count/pageSize)+1; criteria=session.createCriteria(Emp.class) .add(Restrictions.eq("job", "SALESMAN").ignoreCase()) .addOrder(Order.desc("sal")); //开始分页，设置从哪条记录开始查 List<Emp> emplist=criteria.setFirstResult((pageIndex-1)*pageSize) .setMaxResults(pageSize) .list(); for (Emp emp : emplist) { System.out.println(emp.getEname()+","+emp.getSal()); } System.out.println("总页数:"+totalPage); System.err.println("总记录数："+count); System.out.println("当前页号："+pageIndex); }
/**
* 连接查询
* Criteria里面只有内连接和迫切做外链接
*/
//查询RESEARCH部们中姓名包括s的员工
@Test public void test16(){ List<Emp> emplistList=session.createCriteria(Emp.class) .add(Restrictions.ilike("ename", "s",MatchMode.ANYWHERE)) .createCriteria("dept") .add(Restrictions.eq("dname","RESEARCH").ignoreCase()) .list(); for (Emp emp : emplistList) { System.out.println(emp.getEname()+","+emp.getDept().getDname()); } } //查询RESEARCH部门中姓名包含s的员工 @Test public void test17(){ List<Emp> empList=session.createCriteria(Emp.class,"e") .createAlias("dept", "d") .add(Restrictions.ilike("e.ename","s",MatchMode.ANYWHERE)) .add(Restrictions.eq("d.dname","RESEARCH").ignoreCase()) .list(); for (Emp emp : empList) { System.out.println(emp.getEname()+","+emp.getDept().getDname()); } }
//左外连接
//查询位置在山西吕梁的部门及其人数
//FetchMode.JOIN表示迫切做外链接查询策略
@Test public void test18(){ List<Dept> deptList=session.createCriteria(Dept.class,"d") .setFetchMode("emps",FetchMode.JOIN) .add(Restrictions.eq("d.loc","山西吕梁").ignoreCase()) .list(); for (Dept dept : deptList) { System.out.println(dept.getDname()+","+dept.getLoc()+","+dept.getEmps().size()); } }
//去掉重复数据
@Test public void test19(){ List<Dept> deptList=session.createCriteria(Dept.class,"d") .setFetchMode("emps", FetchMode.JOIN) .add(Restrictions.eq("d.loc","山西吕梁").ignoreCase()) .list(); HashSet<Dept> set=new HashSet<Dept>(deptList); for (Dept dept : set) { System.out.println(dept.getDname()+","+dept.getLoc()+","+dept.getEmps().size()); } }
/**
* 投影，分组，及DetachedCriteria
*/
//查询所有的部门名称】
@Test public void test20(){ List<String> list=session.createCriteria(Dept.class) .setProjection(Property.forName("dname")) .list(); for (String str : list) { System.out.println(str); } }
//查询两个或者两个以上的属性
//查询员工的姓名和入职时间
@Test public void test21(){ List<Object[]> list=session.createCriteria(Emp.class) .setProjection( Projections.projectionList() .add(Property.forName("ename")) .add(Property.forName("hiredate")) ) .list(); for (Object[] objects : list) { System.out.println(objects[0]+","+objects[1]); } }
/**
* 分组
* 1.groupProperty:分组
* 2.rowCount():统计记录数
* 3.avg:平均值
* 4.max:最大值
* 5.min:最小值
* 6.count:统计某一字段的非空记录数
* 7.sum:针对某一字段进行求和
*/
//统计各个部门的平均工资，最高工资，最低工资
@Test public void test22(){ List<Object[]> list=session.createCriteria(Emp.class,"e") .createAlias("e.dept", "d") .setProjection( Projections.projectionList() .add(Projections.groupProperty("d.dname")) .add(Projections.avg("e.sal")) .add(Projections.max("e.sal")) .add(Projections.min("e.sal")) ) .list(); for (Object[] objects : list) { System.out.println("部门名称"+objects[0]+",最高工资："+objects[2]+"" + ",平均工资："+objects[1]+",最低工资："+objects[3]); } }
//使用DetachedCriteria
//查询RESEARCH部门，姓名包含“a”的员工
@Test public void test23(){ DetachedCriteria detachedCriteria =DetachedCriteria.forClass(Emp.class,"e") .createAlias("e.dept","d") .add(Restrictions.eq("d.dname","RESEARCH").ignoreCase()) .add(Restrictions.ilike("e.ename","a",MatchMode.ANYWHERE)); List<Emp> list=detachedCriteria.getExecutableCriteria(session).list(); for (Emp emp : list) { System.out.println(emp.getEname()+","+emp.getDept().getDname()); } }
//查询工资高于平均工资的员工
@Test public void test24(){ //平均工资 DetachedCriteria detachedCriteria=DetachedCriteria .forClass(Emp.class,"e") .setProjection(Property.forName("sal").avg()); //求工资大于平均工资 List<Emp> emplist=session.createCriteria(Emp.class) .add(Property.forName("sal").gt(detachedCriteria)).list(); for (Emp emp : emplist) { System.out.println(emp.getEname()+","+emp.getSal()); } }
