使用HQL语句方式实现多表多条件组合模糊查询

最近在做struts2+hibernate项目整合，其中有一个两表多条件组合模糊查询功能：

将页面查询条件封装为对象，传至后台处理：

/*查询实例类/

package com.newer.bean;

import java.util.Date;

/**

* 模糊查询对象实体类

*

* @author Siglam Lee

*

*/

public class SearchModelBean {

// 计划名称

private String plan_Name;

// 所属任务的任务id

private int task_Id;

// 起始开始时间

private Date beginDateFrom;

// 末尾开始时间

private Date beginDateTo;

// 起始结束时间

private Date endDateFrom;

// 末尾结束时间

private Date endDateTo;

// 是否反馈

private String isFeedBack;

public SearchModelBean(String plan_Name, int task_Id, Date beginDateFrom,
Date beginDateTo, Date endDateFrom, Date endDateTo,
String isFeedBack) {
super();
this.plan_Name = plan_Name;
this.task_Id = task_Id;
this.beginDateFrom = beginDateFrom;
this.beginDateTo = beginDateTo;
this.endDateFrom = endDateFrom;
this.endDateTo = endDateTo;
this.isFeedBack = isFeedBack;
}

public SearchModelBean() {
}

public String getPlan_Name() {
return plan_Name;
}

public void setPlan_Name(String plan_Name) {
this.plan_Name = plan_Name;
}

public int getTask_Id() {
return task_Id;
}

public void setTask_Id(int task_Id) {
this.task_Id = task_Id;
}

public Date getBeginDateFrom() {
return beginDateFrom;
}

public void setBeginDateFrom(Date beginDateFrom) {
this.beginDateFrom = beginDateFrom;
}

public Date getBeginDateTo() {
return beginDateTo;
}

public void setBeginDateTo(Date beginDateTo) {
this.beginDateTo = beginDateTo;
}

public Date getEndDateFrom() {
return endDateFrom;
}

public void setEndDateFrom(Date endDateFrom) {
this.endDateFrom = endDateFrom;
}

public Date getEndDateTo() {
return endDateTo;
}

public void setEndDateTo(Date endDateTo) {
this.endDateTo = endDateTo;
}

public String getIsFeedBack() {
return isFeedBack;
}

public void setIsFeedBack(String isFeedBack) {
this.isFeedBack = isFeedBack;
}

@Override
public String toString() {
return "SearchModelBean [plan_Name=" + plan_Name + ", task_Id="
+ task_Id + ", beginDateFrom=" + beginDateFrom
+ ", beginDateTo=" + beginDateTo + ", endDateFrom="
+ endDateFrom + ", endDateTo=" + endDateTo + ", isFeedBack="
+ isFeedBack + "]";
}

}

使用HQL语句查询指定字段，新建一个BeanDto类。

/*dto实体类/

package com.newer.dto;

import java.io.Serializable;

import java.util.Date;

public class PlanDto implements Serializable {

private static final long serialVersionUID = 1L;
private int planId;
private String plaName;
private Date beginDate;
private Date endDate;
private String isFeedback;
private String taskName;

public PlanDto() {
}

public PlanDto(int planId, String plaName, Date beginDate, Date endDate,
String isFeedback, String taskName) {
super();
this.planId = planId;
this.plaName = plaName;
this.beginDate = beginDate;
this.endDate = endDate;
this.isFeedback = isFeedback;
this.taskName = taskName;
}

public int getPlanId() {
return planId;
}

public void setPlanId(int planId) {
this.planId = planId;
}

public String getPlaName() {
return plaName;
}

public void setPlaName(String plaName) {
this.plaName = plaName;
}

public Date getBeginDate() {
return beginDate;
}

public void setBeginDate(Date beginDate) {
this.beginDate = beginDate;
}

public Date getEndDate() {
return endDate;
}

public void setEndDate(Date endDate) {
this.endDate = endDate;
}

public String ge
4000
tIsFeedback() {
return isFeedback;
}

public void setIsFeedback(String isFeedback) {
this.isFeedback = isFeedback;
}

public String getTaskName() {
return taskName;
}

public void setTaskName(String taskName) {
this.taskName = taskName;
}

}

`

3. 具体代码块如下：

/* Dao层方法：根据条件对计划进行模糊查询 /

@Override

public List searchPlan(int empId, SearchModelBean bean) {

StringBuffer hql = new StringBuffer(

“select new com.newer.dto.PlanDto”

+ “(p.planId, p.planName, p.beginDate,p.endDate,p.isFeedback,t.taskName)”

+ “from Task t,Plan p where t.taskId=p.task.taskId and t.employeeByImplementorId.employeeId=?”);

SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-MM-dd”);

if (bean != null) {

String plan_Name = bean.getPlan_Name();

int task_Id = bean.getTask_Id();

Date beginDateFrom = bean.getBeginDateFrom();

Date beginDateTo = bean.getEndDateTo();

Date endDateFrom = bean.getEndDateFrom();

Date endDateTo = bean.getEndDateTo();

String isFeedBack = bean.getIsFeedBack();

if (plan_Name != null && !plan_Name.equals(“”)) {

hql.append(“and p.planName like ‘%” + plan_Name + “%’”);

}

if (task_Id > 0) {
hql.append("and t.taskId=" + task_Id);
}
if (beginDateFrom != null && !beginDateFrom.equals("")) {
String beginDateFromStr = sdf.format(beginDateFrom);
hql.append("and p.beginDate>to_date('" + beginDateFromStr
+ "','yyyy-mm-dd')");
}
// 转换时注意单引号，否则会抛出oracle ORA-01840:输入值对于日期格式不够长的异常
if (beginDateTo != null && !beginDateTo.equals("")) {
String beginDateToStr = sdf.format(beginDateTo);
hql.append("and p.beginDate<to_date('" + beginDateToStr
+ "','yyyy-mm-dd')");
}

if (endDateFrom != null && !endDateFrom.equals("")) {
String endDateFromStr = sdf.format(endDateFrom);
hql.append("and p.endDate>to_date('" + endDateFromStr
+ "','yyyy-mm-dd')");
}
if (endDateTo != null && !endDateTo.equals("")) {
String endDateToStr = sdf.format(endDateTo);
hql.append("and p.endDate<to_date('" + endDateToStr
+ "','yyyy-mm-dd')");

}
if (isFeedBack != null && !isFeedBack.equals("")) {
hql.append("and p.isFeedback like '" + isFeedBack + "' ");
}
}
Session session = HibernateSessionFactory.getSession();
Query q = session.createQuery(hql.toString());
q.setInteger(0, empId);
return q.list();
}

ps:由于hibernate是ORM框架，因此需要使用面向对象的思想去思考：

如查询三张表的指定字段，如果使用传统的sql语句多表连接查询非常繁琐，使用session.createsqlquery的方式创建查询对象时也因无法指定addEntity的xxx.Class参数值实现困难，因此我们可以通过ORM框架特性，只查询一张表，通过关系映射配置，使用对象.属性的方式获取到另外两张表的值，非常方便。