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Hibernate学习30 -- Hibernate查询语言（HQL）4 -- 条件查询

2009-12-08 13:10 585 查看

条件查询：
* 可以采用拼字符串的方式传递参数
* 可以采用？来传递参数（索引从0开始）
* 可以采用 :参数名来传递参数
* 如果传递多个参数，可以采用setParamterList方法
* 在hql中可以使用数据库的函数，如：date_format
例子代码如下：

/**
* 条件查询
*/
public class SimpleConditionQueryTest extends TestCase {
public void testQuery1() {
Session session = null;
try {
session = HibernateUtils.getSession();
session.beginTransaction();
//可以拼字符串
List students = session.createQuery
("select s.id, s.name from Student s where s.name like '%1%'")
.list();
for (Iterator iter=students.iterator(); iter.hasNext();) {
Object[] obj = (Object[])iter.next();
System.out.println(obj[0] + "," + obj[1]);
}
session.getTransaction().commit();
}catch(Exception e) {
e.printStackTrace();
session.getTransaction().rollback();
}finally {
HibernateUtils.closeSession(session);
}
}
public void testQuery2() {
Session session = null;
try {
session = HibernateUtils.getSession();
session.beginTransaction();
//可以使用？方式传递参数
//参数的索引从0开始
//传递的参数值，不用单引号引起来
//注意方法链编程
List students = session.createQuery
("select s.id, s.name from Student s where s.name like ?")
.setParameter(0, "%1%")
.list();
for (Iterator iter=students.iterator(); iter.hasNext();) {
Object[] obj = (Object[])iter.next();
System.out.println(obj[0] + "," + obj[1]);
}
session.getTransaction().commit();
}catch(Exception e) {
e.printStackTrace();
session.getTransaction().rollback();
}finally {
HibernateUtils.closeSession(session);
}
}
public void testQuery3() {
Session session = null;
try {
session = HibernateUtils.getSession();
session.beginTransaction();
//使用：参数名称的方式传递参数值
List students = session.createQuery
("select s.id, s.name from Student s where s.name like :myname")
.setParameter("myname", "%1%")
.list();
for (Iterator iter=students.iterator(); iter.hasNext();) {
Object[] obj = (Object[])iter.next();
System.out.println(obj[0] + "," + obj[1]);
}
session.getTransaction().commit();
}catch(Exception e) {
e.printStackTrace();
session.getTransaction().rollback();
}finally {
HibernateUtils.closeSession(session);
}
}
public void testQuery4() {
Session session = null;
try {
session = HibernateUtils.getSession();
session.beginTransaction();
//使用：参数名称的方式传递参数值
List students = session.createQuery
("select s.id, s.name from Student s where s.name like :myname and s.id=:myid")
.setParameter("myname", "%1%")
.setParameter("myid", 12)
.list();
for (Iterator iter=students.iterator(); iter.hasNext();) {
Object[] obj = (Object[])iter.next();
System.out.println(obj[0] + "," + obj[1]);
}
session.getTransaction().commit();
}catch(Exception e) {
e.printStackTrace();
session.getTransaction().rollback();
}finally {
HibernateUtils.closeSession(session);
}
}
public void testQuery5() {
Session session = null;
try {
session = HibernateUtils.getSession();
session.beginTransaction();
//支持in，需要使用setParameterList进行参数传递
List students = session.createQuery
("select s.id, s.name from Student s where s.id in(:myids)")
.setParameterList("myids", new Object[]{1, 2, 3, 4, 5})
.list();
for (Iterator iter=students.iterator(); iter.hasNext();) {
Object[] obj = (Object[])iter.next();
System.out.println(obj[0] + "," + obj[1]);
}
session.getTransaction().commit();
}catch(Exception e) {
e.printStackTrace();
session.getTransaction().rollback();
}finally {
HibernateUtils.closeSession(session);
}
}
public void testQuery6() {
Session session = null;
try {
session = HibernateUtils.getSession();
session.beginTransaction();
//查询2008年2月创建的学生
List students = session.createQuery
("select s.id, s.name from Student s where date_format(s.createTime, '%Y-%m')=?")
.setParameter(0, "2008-02")
.list();
for (Iterator iter=students.iterator(); iter.hasNext();) {
Object[] obj = (Object[])iter.next();
System.out.println(obj[0] + "," + obj[1]);
}
session.getTransaction().commit();
}catch(Exception e) {
e.printStackTrace();
session.getTransaction().rollback();
}finally {
HibernateUtils.closeSession(session);
}
}

public void testQuery7() {
Session session = null;
try {
session = HibernateUtils.getSession();
session.beginTransaction();
SimpleDateFormat sdf = new SimpleDateFormat
("yyyy-MM-dd HH:mm:ss");
//查询2008-01-10到2008-02-15创建的学生
List students = session.createQuery
("select s.id, s.name from Student s where s.createTime between ? and ?")
.setParameter(0, sdf.parse("2008-01-10 00:00:00"))
.setParameter(1, sdf.parse("2008-02-15 23:59:59"))
.list();
for (Iterator iter=students.iterator(); iter.hasNext();) {
Object[] obj = (Object[])iter.next();
System.out.println(obj[0] + "," + obj[1]);
}
session.getTransaction().commit();
}catch(Exception e) {
e.printStackTrace();
session.getTransaction().rollback();
}finally {
HibernateUtils.closeSession(session);
}
}
}

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