hibernate 执行sql ,select 返回string long

1.执行sql，返回一个结果集，适用查询一个字段并返回一条记录

public Long findSeqTbTest() {  
    String sql = "select SEQ_TB_TEST.nextval from dual";  
    SQLQuery query = this.getSession().createSQLQuery(sql);  
    String str = query.uniqueResult().toString();  
    return Long.valueOf(str);  
}  

//获取表中最小的id  
String sql = "select min(a.employeeid) from Emplyees a";  
Long id = (Long) session.createQuery(sql).uniqueResult();  
  
//获取数据库时间mysql  
String sql = "select now() from dual";  
String time =  session.createSQLQuery(sql).uniqueResult().toString();  

2.删除、更新等操作，这里参数是从0开始的

public void deleteTbTest(Long id) {  
    String hql = "DELETE FROM TbTest WHERE ID = ?";  
    this.getSession().createQuery(hql).setLong(0, id).executeUpdate();  
}  

public void updateTbTest(Date date, boolean flag) {  
    String sql = "update tb_test set t_name=? where t_status!=1 and t_date" + (flag ? "<?" : "=?");  
    SQLQuery query = this.getSession().createSQLQuery(sql);  
    query.setString(0,flag ? "hello": "hi").setDate(1, date).executeUpdate();  
}  

3.执行sql，查询单表中多条数据

//尽量避免适用"*"  
String sql = "select * from employee e where e.valid=1 and not exists (select employeeid from attendance a where a.employeeid=e.employeeid and a.date = ?)"; 
 SQLQuery query = getSession().createSQLQuery(sql);  
query.addEntity(Employee.class).setDate(0, day);  
List<Employee> retList = query.list();  

4.查询多表

String hql = "select new map(dept.deptID as deptID,dept.depNo as deptNo,dept.deptName as deptName,emp.empName as empName,emp.empID as empID,emp.empAge as age,emp.empNo as empNo) from Department dept ,Employee emp where dept.depID = emp.depID and emp.empName = ? and emp.sex = ?";  
return getHibernateTemplate().find(hql, new Object[] { name, sex }); 

每个字段都保存在map中（key是字段名，value是此字段的值如：[{empID=1,empName=leona,...},...]）

5.查询多表

 

String sql = "select dept.deptID as deptID,dept.depNo as deptNo,dept.deptName as deptName,emp.empName as empName,emp.empID as empID,emp.empAge as age,emp.empNo as empNo,emp.birthday as birthday from Employee emp LEFT JOIN Department dept on dept.depID = emp.depID where empName = ?";  
        return (List<EmpBean>) this.getSession()  
            .createSQLQuery(sql)  
            .addScalar("deptID", Hibernate.STRING)  
            .addScalar("deptNo", Hibernate.STRING)  
            .addScalar("deptName", Hibernate.STRING)  
            .addScalar("empName", Hibernate.STRING)  
            .addScalar("empID", Hibernate.STRING)  
            .addScalar("age", Hibernate.LONG)  
            .addScalar("birthday", Hibernate.DATE)  
            .addScalar("empNo", Hibernate.STRING)  
            .setString(0, empName)  
            // 将结果集映射为EmpBean对象  
            .setResultTransformer(Transformers.aliasToBean(EmpBean.class)).list();  

String hql = "from Attendance att where att.employeeid = ? and att.date =? "; 
List<Attendance> list = this.getHibernateTemplate().find(hql, 
new Object[] { employeeid, workDay }); 
if (null != list && !list.isEmpty()) { 
return list.get(0); 
} 

String queryString = "FROM Attendance a WHERE a.employeeid=? AND DATE_FORMAT(a.date,'%Y-%m')=DATE_FORMAT(?,'%Y-%m') ORDER BY a.teamname"; 
Query queryObject = getSession(). createQuery(queryString); 
queryObject.setParameter(0, id); 
queryObject.setParameter(1, date); 
return queryObject.list(); 

Session session = getSession(); 
session.clear(); 
getSession().saveOrUpdate(transientInstance); 

startBatch()的用法

 

public class LocalDaoImpl extends SqlMapClientDaoSupport implements LocalDao { 

    public void insertBuNaTaxBatLst(final PaginatedList list) 
    { 
         getSqlMapClientTemplate().execute(new SqlMapClientCallback() { 
                public Object doInSqlMapClient(SqlMapExecutor executor) 
                        throws SQLException { 
                    executor.startBatch(); 
                    // do some iBatis operations here 
                    for(int i=0,count=list.size();i<count;i++) 
                    {    
                        executor.insert("insertBuNaTaxBatLst", list.get(i)); 
                        if (i % 50 == 0) { 
                            System.out.println("----" + i);//没有意义只为测试 
                        } 
                    } 
                    executor.executeBatch(); 
                    return null; 
                } 
            }); 
    }