C#数据路接口中获取SQL数据的用法

1. 获取一条记录

 string sql = string.Format(“”);

 DataRow row;

 if (GetFirstDataRow(sql, out row))

     {

      caseInfoBrief.TEST_TASK_STATUS = row["CASE_STATUS_FINISH"].ToString()

              return true;

      }

2. 获取多条记录

string sql = string.Format("select * from T_TEST_TASK where TEST_USER_ID={0} and TASK_STATUS in ({1}, {2}) ", uID,(int)E_TEST_TASK_STATUS.已分派, (int)E_TEST_TASK_STATUS.待评价);

 DataTable dataTable;

if (GetDataTable(sql, out dataTable))

{

  foreach (DataRow row in dataTable.Rows)

     {

        T_TEST_TASK testTask = new T_TEST_TASK();

                testTask.TASK_ID = row["TASK_ID"].ToString()                       

               int.TryParse(row["TASK_TYPE"].ToString(), out testTask.TASK_TYPE);

               DateTime.TryParse(row["CREATE_TIME"].ToString(), out caseInfoBrief.CREATE_TIME);

        list.Add(testTask);

        }

    }

3.数据分页显示

var sql = string.Format("select * from (select rownum rn,T_CASE_INFO.* from T_CASE_INFO)  where rn>={0}*{1} and rn<={0}*{1}+{1}", page,record);

4.批量执行SQL语句

 var sql = string.Format("delete from T_CASE_INFO where CASE_ID='{0}'",caseID);

 var sql2 = string.Format("delete from T_CASE_LOG where CASE_ID='{0}'", caseID);

 List<string> sqlList = new List<string>();

 sqlList.Add(sql);

 sqlList.Add(sql2);

 return ExecuteListNonQuery(sqlList);

5.统计个数

select  sum( case Test_task_status when null then 0 else 1 end ) as test_total ,  sum( case Test_task_status when 5 then 1 else 0 end ) as test_finished,sum( case Suvey_Task_Status when null then 0 else 1 end ) as survey_total , sum( case Suvey_Task_Status when 5 then 1 else 0 end ) as survey_finished 

from v_case_breif_info  group by  CASE_ID)

6.左连接查询

SELECT TotalScore,graped,giveup,Finished  from

(select USER_SCORE_CURRENT AS TotalScore,ID from T_TEST_USER_INFO WHERE ID=1) t1  left join

(select USER_ID,sum(case USER_TASK_STATUS when 1 then 1 else 0  END) as graped,  sum(case USER_TASK_STATUS when 2 then 1 else 0  END) as giveup,   sum(case USER_TASK_STATUS when 3 then 1 else 0  END) as Finished 

 from T_TEST_TASK_USER  where USER_ID=1 group by User_ID) t on t1.id = T.USER_ID