JAVA DAO层 对数据库操作常用方法(转)
2015-03-25 11:34
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第一种: List<Map<String, Object>>
1、不带参数的
[java] viewplaincopy
<span style="font-size:18px"> /**
* @return
* @throws SQLException
*/
@SuppressWarnings("unchecked")
public List<Map<String, String>> getProjectModule() throws SQLException
{
StringBuffer sql = new StringBuffer();
sql.append("select ........ ........,");
sql.append(" ........ ........");
sql.append(" from dbo.........");
sql.append(" where fileuseflg='0' ");
Query query = this.getSession().createSQLQuery(sql.toString())
.setResultTransformer(Transformers.ALIAS_TO_ENTITY_MAP);
return query.list();
}</span>
2、带参数的
[java] viewplaincopy
<span style="font-size:18px"> /**
* @param custId
* @param page
* @param rows
* @return
*/
@SuppressWarnings("unchecked")
public List<Map<String, Object>> getCustomerList(String regieId, int page, int rows) throws SQLException{
StringBuffer sql = new StringBuffer();
sql.append("SELECT a.*,b.CUST_NAME ");
sql.append(" FROM ........ ");
sql.append(" WHERE a.CUSTOM_ID = b.CUSTOM_ID ");
sql.append(" AND a.VISIT_REGION_ID =:regieId ");
sql.append(" ORDER BY a.CUST_REGIE_CODE ");
return this.getSession().createSQLQuery(sql.toString()).setParameter("regieId", regieId)
.setResultTransformer(Transformers.ALIAS_TO_ENTITY_MAP)
.setFirstResult((page-1)*rows).setMaxResults(rows).list();
}</span>
sql.append(" AND a.VISIT_REGION_ID =:regieId ");
return this.getSession().createSQLQuery(sql.toString()).setParameter("regieId", regieId)
跟 sql.append(" AND a.VISIT_REGION_ID ='"+regieId+"' "); 效果一样,如:
[java] view
plaincopy
<span style="font-size:18px"> /**
* @param projectId
* @param documentID
* @return
* @throws SQLException
*/
@SuppressWarnings("unchecked")
public List<Map<String, Object>> fillDgPaddingListData(String projectId,
String documentID) throws SQLException {
System.out.println("编辑操作");
StringBuffer sql = new StringBuffer();
sql.append("SELECT a.* ");
sql.append("FROM ........ a ");
sql.append(" left join dbo.XLJXC_PROJECT b ");
sql.append(" on a.subProjectID=b.PROJECT_ID ");
sql.append(" WHERE projectID = '" + projectId
+ "' and documentID='" + documentID + "' ");
Query query = this.getSession().createSQLQuery(sql.toString())
.setResultTransformer(Transformers.ALIAS_TO_ENTITY_MAP);
return query.list();
}</span>
第二种 List<String>
[java] viewplaincopy
<span style="font-size:18px"> /**
* @param documentId
* @return
*/
@SuppressWarnings("unchecked")
public List<String> findFilePathBySrcId(String srcId)
{
StringBuffer sql = new StringBuffer();
sql.append("SELECT ........ ");
sql.append("FROM dbo......... ");
sql.append("WHERE srcID = '"+srcId+"' ");
List<String> list=this.getSession().createSQLQuery(sql.toString()).list();
return list;
}</span>
第三种 String
[java] viewplaincopy
<span style="font-size:18px"> /**
* @param custId
* @return
*/
public String getCustomerCount(String custId) throws SQLException{
StringBuffer sql = new StringBuffer();
sql.append("SELECT count(*)");
sql.append(" FROM ........cc_customer b ");
sql.append(" WHERE a.CUST_REGIE_CODE = b.CUST_CODE ");
sql.append(" AND a.VISIT_REGION_ID =:custId ");
return this.getSession().createSQLQuery(sql.toString()).setParameter("custId", custId).list().get(0).toString();
}</span>
[java] view
plaincopy
<span style="font-size:18px">return query.list().get(0)==null?"": query.list().get(0).toString(); 判断</span><span style="font-size:18px">query.list().get(0)</span><span style="font-size:18px">是否为空 如:</span>
[java] view
plaincopy
<span style="font-size:18px"> public String getComment(String id) throws SQLException{
StringBuffer sql = new StringBuffer();
sql.append("select COMMENT ");
sql.append(" from ........ ");
sql.append(" where id='"+id+"'");
Query query = this.getSession().createSQLQuery(sql.toString());
return query.list().get(0)==null?"": query.list().get(0).toString();
}</span>
第四种 不带返回值
[java] viewplaincopy
<span style="font-size:18px"> /**
* @param ent
* @throws SQLException
* 插入
*/
public void saveVisitCustormer(Work135DayVisitCust ent) throws SQLException{
StringBuffer sql = new StringBuffer();
sql.append("insert into DB2INST1.WORK135_DAY_VISIT_CUST ");
sql.append("........ ");
sql.append(" ...... ");
Query query = this.getSession().createSQLQuery(sql.toString());
query.executeUpdate();
//this.getSession().save(ent);
}
/**
* @throws SQLException
* 删除
*/
public void delectDictByItemId(String itemId,String personCode,String orgCode)throws SQLException{
StringBuffer sql = new StringBuffer();
sql.append("delete from ........");
sql.append(" where evaluate_Item_Id = '"+itemId+"' and person_Code ='"+personCode+"' and org_Code ='"+orgCode+"'");
Query query = getSession().createSQLQuery(sql.toString());
query.executeUpdate();
}</span>
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