[英]How to return refcursor from plpgsql function in c#?
我是 plpgsql 的菜鳥,我創建了一個存儲過程來將表數據放入 refcursor,我正在嘗試從 plpgsql 和 c# 調用該過程來檢查過程/c# 代碼是否工作正常。
程序:
CREATE OR REPLACE FUNCTION public.proc_get_test(out tbldata refcursor)
returns refcursor
LANGUAGE plpgsql
AS $function$
BEGIN
open tbldata for
select * from arc_mmstbrndgroup;
END;
$function$;
從 plpgsql 調用過程:
SELECT proc_get_test('cur');
然后嘗試從 refcursor 獲取數據:
FETCH ALL FROM cur;
SQL 錯誤 [34000]: 錯誤: cursor "cur" 不存在
嘗試的另一種方法:
BEGIN;
SELECT proc_get_test('cur');
FETCH ALL FROM cur;
COMMIT;
Output:
C#:
var p = new PostgreSQLDynamicParameters();
p.Add("tbldata", dbType: NpgsqlDbType.Refcursor, direction: ParameterDirection.Output);
using (var multi = _connection.QueryMultiple("proc_get_test", param: p, commandType: CommandType.StoredProcedure))
{
List<PostgresModel> dataMaster = multi.Read<PostgresModel>().AsList();
return new ResponseModel { ResultSet = dataMaster, StatusCode = 1, StatusDescription = "Success" };
}
Api 也只接收 1 行 null 值
誰能幫我調用 plpgsql 和 c# 中的過程?
所以我嘗試在 plpgsql 中創建一個帶有多個引用的演示 function,如下所示:
CREATE OR REPLACE FUNCTION public.proc_get_multiple_cursors_test()
returns setof refcursor
LANGUAGE plpgsql
AS $$
DECLARE
ref1 refcursor:= 'ref1';
ref2 refcursor:= 'ref2';
BEGIN
open ref1 for
select * from arc_mmstbrndgroup;
return next ref1;
open ref2 for
select * from arc_mmstbrndgroup;
return next ref2;
END;
$$
並像這樣從 c# 調用這個 function :
_connection.Open();
NpgsqlTransaction trans = _connection.BeginTransaction();
using (var multi = _connection.QueryMultiple("proc_get_multiple_cursors_test", null, transaction: trans, commandType: CommandType.StoredProcedure))
{
var result = multi.Read();
var ref1 = _connection.QueryMultiple("FETCH ALL IN ref1", null, commandType: CommandType.Text, transaction: trans);
List<PostgresModel> dataMaster = ref1.Read<PostgresModel>().AsList();
var ref2 = _connection.QueryMultiple("FETCH ALL IN ref2", null, commandType: CommandType.Text, transaction: trans);
List<PostgresModel> dataMaster2 = ref2.Read<PostgresModel>().AsList();
trans.Commit();
_connection.Close();
return new ResponseModel
{
ResultSet = new
{
master1 = dataMaster,
master2 = dataMaster2
},
StatusCode = 1,
StatusDescription = "Success"
};
}
現在它返回兩個游標的 output
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