AMImpl 中 執行sql語句的例子

執行更新語句的例子

  public void updateExamHourFromUser(){
    String sql = " update exam_single s set s.finish_hours = (select sum(h.fill_hour) from exam_single_hour h where s.id = h.exam_single_id ) ";
    ResultSet rs = null;
    DBTransaction db = this.getDBTransaction();
    PreparedStatement ps = db.createPreparedStatement(sql, 0);
            try {
                ps.execute(); 
                db.commit();
                ps.close();
            } catch (SQLException ex) {
                ex.printStackTrace();
            }
            this.getExamSingleView2().executeQuery();
            return ;
   }

執行查詢語句的例子：

  public boolean isExamUserExistInProject(String projectId,String userId){

    String querySQL = " select * from exam_single t where project_id = '"+projectId+"' and user_id = '"+userId+"'  ";
    ResultSet rs = null;
    DBTransaction db = this.getDBTransaction();
    boolean flag = false;
    //
    PreparedStatement ps = db.createPreparedStatement(querySQL, 0);
    try {
        rs = ps.executeQuery();
        while (rs.next()) {
          if( rs.getString("Id")!=null){
            flag = true;
          }
        }
    } catch (SQLException ex) {
        ex.printStackTrace();
        db.closeTransaction();
    }    
    return flag;
  }