Hibernate之QBC持久层封装（二）
DaoTemplate类：
public class DaoTemplate {
//注入HibernateTemplate
protected HibernateTemplate hibernateTemplate;
public void setHibernateTemplate(HibernateTemplate hibernateTemplate) {
this.hibernateTemplate = hibernateTemplate;
}
/**
* 保存数据到数据库
* @author peak
* @param entity 要保存的对象
* @return
* 返回数据是否保存成功
* */
public boolean sava(final Object entity) {
return (Boolean) hibernateTemplate.execute(new HibernateCallback() {
public Object doInHibernate(Session arg0)
throws HibernateException, SQLException {
try {
arg0.save(entity);
return true;
} catch (HibernateException e) {
// TODO Auto-generated catch block
throw new RuntimeException("hibernate数据保存异常：", e);
}
}
});
}
/**
* 更新数据
* @author peak
* @param entity 要更新的对象
* @return
* 返回数据是否更新成功
* */
public boolean update(final Object entity) {
return (Boolean) hibernateTemplate.execute(new HibernateCallback() {
public Object doInHibernate(Session arg0)
throws HibernateException, SQLException {
try {
arg0.update(entity);
return true;
} catch (HibernateException e) {
// TODO Auto-generated catch block
throw new RuntimeException("hibernate数据更新异常：", e);
}
}
});
}
/**
* 删除数据
* @author peak
* @param entity 要删除的对象
* @return
* 返回数据是否删除成功
* */
public boolean delete(final Object entity) {
return (Boolean) hibernateTemplate.execute(new HibernateCallback() {
public Object doInHibernate(Session arg0)
throws HibernateException, SQLException {
try {
arg0.delete(entity);
return true;
} catch (HibernateException e) {
// TODO Auto-generated catch block
throw new RuntimeException("hibernate数据删除异常：", e);
}
}
});
}
/**
* 基本查询 （多表链接、多条件、分页、排序）
* @author peak
* @param classzz 查询的类
* @param conditions 查询条件
* @return
* ResultList 数据结果集ResultList.List 与ResultList.pager
* */
public <T> ResultList find(final Class classzz,
final Condition... conditions) {
return (ResultList) hibernateTemplate.execute(new HibernateCallback() {
public Object doInHibernate(Session arg0)
throws HibernateException, SQLException {
Criteria criteria = arg0.createCriteria(classzz);
// 多表连接
linkJoin(criteria, conditions);
// 查询条件
prepareCondtion(criteria, conditions);
// 设置分页得到分页结果
Pager pager = pagerInfo(criteria, conditions);
// 排序条件
orderCondtion(criteria, conditions);
// 得到查询结果
List<T> list = criteria.list();
// 返回结果集
ResultList rl = new ResultList();
rl.setList(list);
rl.setPager(pager);
return rl;
}
});
}
/**
* 分组查询（多表链接、分组、聚合函数、分页、排序）
*@author peak
* @param classzz 查询的类
* @param conditions 查询条件
* @return
* 返回Map 分组查询结果
* Map.getKey() 为分组查询属性别名
* Map.getValue() 为分组查询属性所对应的值
* */
public List<Map<String,Object>> groupFind(final Class classzz,
final Condition... conditions) {
return (List<Map<String,Object>>) hibernateTemplate
.execute(new HibernateCallback() {
public Object doInHibernate(Session session)
throws HibernateException, SQLException {
// TODO Auto-generated method stub
Criteria criteria = session.createCriteria(classzz);
// 多表连接
linkJoin(criteria, conditions);
// 分组
List<String> alList = functionSetting(criteria, conditions);
// 查询条件
prepareCondtion(criteria, conditions);
// 排序条件
orderCondtion(criteria, conditions);
List<Object[]> l = criteria.list();// 查询结果 object对象数组
List list = new ArrayList(0);
for (Object[] obj : l) {
Map map = new HashMap(0);
for(int i = 0;i<obj.length;i++){
map.put(alList.get(i), obj[i]);
}
list.add(map);
}
return list;
}
});
}
/**
* 设置多表连接
* @author peak
* @param qbc Hibernate Criteria
* @param conditions 多表连接的条件
* */
protected void linkJoin(Criteria qbc, Condition... conditions) {
if (conditions != null) {
for (Condition c : conditions) {
if (c.getLinkCondition() != null) {
for (int i = 0; i < c.getLinkCondition().length; i++) {
qbc.createAlias(
c.getLinkCondition()[i].getPropertyName(),
c.getLinkCondition()[i].getPropertyAlias(),
Criteria.LEFT_JOIN);
}
}
}
}
}
/**
* 设置分页 获取分页信息（总条数、总页数据）
* @author peak
* @param qbc Hibernate Criteria
* @param conditions 多表连接的条件
* @return
* 返回分页结果Pager
* */
protected Pager pagerInfo(Criteria qbc, Condition... conditions) {
Pager pager = new Pager();
if (conditions != null) {
for (Condition c : conditions) {
/** 拼接分页查询 */
if (c.getPager() != null) {
// 得到总条数
qbc.setProjection(Projections.rowCount());
pager.setRecordCount((Integer) qbc.uniqueResult());
qbc.setFirstResult((c.getPager().getPageIndex() - 1)
* c.getPager().getPageSize());
qbc.setMaxResults(c.getPager().getPageSize());
// 清空投影查询的设置
qbc.setProjection(null); qbc.setResultTransformer(CriteriaSpecification.DISTINCT_ROOT_ENTITY);
// 计算总页数
pager.setPageCount((pager.getRecordCount()
% c.getPager().getPageSize() == 0) ? (pager
.getRecordCount() / c.getPager().getPageSize())
: (pager.getRecordCount()
/ c.getPager().getPageSize() + 1));
// 当前页数
pager.setPageIndex(c.getPager().getPageIndex());
}
}
}
return pager;
}
/**
* 拼接查询条件
* @author peak
* @param qbc Hibernate Criteria
* @param conditions 多表连接的条件
* */
protected void prepareCondtion(Criteria qbc, Condition... conditions) {
if (conditions != null) {
for (Condition c : conditions) {
if (c.getMyWheres() != null) {
for (MyWhere w : c.getMyWheres()) {
if (w.getBetweenValue() != null
|| (w.getPropertyValue() != null)
&& (w.getPropertyName() != null)
|| (w.getLhs() != null) && (w.getRhs() != null)) {
switch (w.getCompare()) {
case EQ:
qbc.add(Restrictions.eq(w.getPropertyName(),
w.getPropertyValue()));
break;
case LT:
qbc.add(Restrictions.lt(w.getPropertyName(),
w.getPropertyValue()));
break;
case GT:
qbc.add(Restrictions.gt(w.getPropertyName(),
w.getPropertyValue()));
break;
case LE:
qbc.add(Restrictions.le(w.getPropertyName(),
w.getPropertyValue()));
break;
case GE:
qbc.add(Restrictions.ge(w.getPropertyName(),
w.getPropertyValue()));
break;
case NE:
qbc.add(Restrictions.ne(w.getPropertyName(),
w.getPropertyValue()));
break;
case LIKE:
qbc.add(Restrictions.like(w.getPropertyName(), w
.getPropertyValue() == null ? "" : w
.getPropertyValue().toString(),
MatchMode.ANYWHERE));
break;
case BETWEEN:
qbc.add(Restrictions.between(w.getPropertyName(),
w.getBetweenValue()[0], w.getBetweenValue()[1]));
break;
case IN:
qbc.add(Restrictions.in(w.getPropertyName(),
(Object[]) w.getPropertyValue()));
break;
case AND:
qbc.add(Restrictions.and(w.getLhs(), w.getRhs()));
break;
default:
break;
}
}
}
}
}
}
}
/**
* 拼接排序语句
* @author peak
* @param qbc Hibernate Criteria
* @param conditions 多表连接的条件
* */
protected void orderCondtion(Criteria qbc, Condition... conditions) {
if (conditions != null) {
for (Condition c : conditions) {
if (c.getOrder() != null) {
switch (c.getOrder().getDirect()) {
case ASC:
qbc.addOrder(Order.asc(c.getOrder().getFieldName()));
break;
case DESC:
qbc.addOrder(Order.desc(c.getOrder().getFieldName()));
break;
default:
break;
}
}
}
}
}
/**
* 聚合函数设置
* @author peak
* @param qbc Hibernate Criteria
* @param conditions 多表连接的条件
* @return
* 返回分组属性别名集合
* */
protected List<String> functionSetting(Criteria qbc, Condition... conditions) {
List<String> alList = null;
if (conditions != null) {
ProjectionList plist = Projections.projectionList();//聚合函数集合
alList = new ArrayList<String>();//所用别名集合
for (Condition c : conditions) {
if(c.getGroupBy()!=null){
if(c.getGroupBy().getGroup()!=null){
for (Map.Entry<String, String> gb : c.getGroupBy().getGroup().entrySet()) {
plist.add(Projections.groupProperty(gb.getKey()));//设置分组属性
alList.add(gb.getValue());//设置分组别名
}
}
if (c.getGroupBy().getFunctionDemands() != null) {
for (FunctionDemand fd : c.getGroupBy().getFunctionDemands()) {
alList.add(fd.getAlia());
switch (fd.getFun()) {
case AVG:
plist.add(Projections.alias(
Projections.avg(fd.getPro()), fd.getAlia()));
break;
case COUNT:
plist.add(Projections.alias(
Projections.count(fd.getPro()),
fd.getAlia()));
break;
case MAX:
plist.add(Projections.alias(
Projections.max(fd.getPro()), fd.getAlia()));
break;
case MIN:
plist.add(Projections.alias(
Projections.min(fd.getPro()), fd.getAlia()));
break;
case SUM:
plist.add(Projections.alias(
Projections.sum(fd.getPro()), fd.getAlia()));
break;
default:
break;
}
}
}
}
}
qbc.setProjection(plist);
}
return alList;
}
}
其中有很多不完善的地方还在继续完善中
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