JAVA DAO層 對數據庫操作常用方法（轉）

第一種：   List<Map<String, Object>>

1、不帶參數的

<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、帶參數的

<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+"' "); 效果一樣，如：

<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("編輯操作");
        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>

第二種  List<String>

<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>

第三種 String

<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>

<span style="font-size:18px">return query.list().get(0)==null?"": query.list().get(0).toString();  判斷</span><span style="font-size:18px">query.list().get(0)</span><span style="font-size:18px">是否爲空 如:</span>

<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>

第四種 不帶返回值

<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
     * 刪除
     */
    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>