hibernate 中createQuery与createSQLQuery两个用法
hibernate 中createQuery与createSQLQuery两者区别是：
前者用的hql语句进行查询，后者可以用sql语句查询
前者以hibernate生成的Bean为对象装入list返回
后者则是以对象数组进行存储
比如我们在获得session后：
createQuery：
try{
Session session=this.hibernateTemplate.getSessionFactory().getCurrentSession();
//这里的表名dcn_flow是数据库里的表名
String sql="select local,remote,object_id from dcn_flow where is_NPI <> 9 ";
Query query=session.createSQLQuery(sql);
List list = query.list();
System.out.println("dao层执行的结果"+list);
//此时dao层返回的是一个object类型的数组
dao层执行的结果:[[Ljava.lang.Object;@da341, [Ljava.lang.Object;@1592141, [Ljava.lang.Object;@9652e4, [Ljava.lang.Object;@11c3288, [Ljava.lang.Object;@399c02, [Ljava.lang.Object;@317dc9, [Ljava.lang.Object;@1394e9d, [Ljava.lang.Object;@1583882, [Ljava.lang.Object;@e60a94, [Ljava.lang.Object;@c0843d, [Ljava.lang.Object;@129dff4, [Ljava.lang.Object;@2e0dcb, [Ljava.lang.Object;@18ba429]
List dcnList=null;
if(list!=null&&list.size()>0){
dcnList=new ArrayList();
for(int i=0;i
//我在此处遍历返回的结果将数据放到我的实体类DCN_FlowVo里
Object[] obj=(Object[])list.get(i);
DCN_FlowVo dcn=new DCN_FlowVo();
if(obj[0]!=null){
dcn.setLocal(obj[0].toString());
}
if(obj[1]!=null){
dcn.setRemote(obj[1].toString());
}
if(obj[2]!=null){
dcn.setObject_id(obj[2].toString());
}
dcnList.add(dcn);
}
}
return dcnList;
}catch(Exception e){
System.out.println(e);
return null;
}
createSQLQuery：
public List findByDepartment_id(String department_id){
//我这个hql里的CirCuit是实体类 ，:department_id 是告诉hibernate以map形式存入参数
String hql = " FROM CirCuit where DEPARTMENT_ID = :department_id ";
Map params = new HashMap();
params.put("department_id", department_id);
//此处返回的是封装circuit对象集合
return cirCuitDao.find(hql, params);
}
调用的方法是我封装好的：
public List find(String hql, Map params) {
Query q = this.getCurrentSession().createQuery(hql);
//对map进行遍历
if (params != null && !params.isEmpty()) {
for (String key : params.keySet()) {
q.setParameter(key, params.get(key));
}
}
return q.list();
}
//实体类，通过注解形式把实体类和数据库字段对应上
@Entity
@Table(name = "CMDB.NE_CIRCUIT_RESOURCE")
@SequenceGenerator(name="objectId",allocationSize=1,initialValue=1,sequenceName="cmdb.SEQ_circuit_objectID")
public class CirCuit implements Serializable{
private static final Long SERIALVERSIONUID = -3898355999058501880L;
private Long objectId;
private Double gt_version;
private String circuit_no;
private String department_id;
@Id
@Column(name="OBJECTID",nullable=false)
@GeneratedValue(strategy=GenerationType.SEQUENCE,generator="objectId")
public Long getObjectId() {
return objectId;
}
public void setObjectId(Long objectId) {
this.objectId = objectId;
}
@Column(name="GT_VERSION")
public Double getGt_version() {
return gt_version;
}
public void setGt_version(Double gt_version) {
this.gt_version = gt_version;
}
@Column(name="CIRCUIT_NO",length=150,nullable=false)
public String getCircuit_no() {
return circuit_no;
}
public void setCircuit_no(String circuit_no) {
this.circuit_no = circuit_no;
}
@Column(name="DEPARTMENT_ID",length=173)
public String getDepartment_id() {
return department_id;
}
public void setDepartment_id(String department_id) {
this.department_id = department_id;
}
