execSql

//执行 insert update delete 语句

       public static booleanexecSql(String sql){

              boolean flag=false;

              introws=0;

              Connection conn=getConnection();

              PreparedStatement pre=null;

              try {

                     pre=conn.prepareStatement(sql);

                     rows=pre.executeUpdate();

                     if(rows>0){

                            flag=true;

                     }else{

                            flag=false;

                     }

                     conn.commit();

              } catch (SQLException e) {

                     flag=false;

              }finally{

                     Tool.release(null,pre,conn);

              }

              return flag;

       }