[英]PostgreSQL: function returns multiple recordsets: how to read in c#?
使用此鏈接http://www.sqlines.com/postgresql/npgsql_cs_result_sets我創建了示例,但它不起作用:有我的功能:
CREATE OR REPLACE FUNCTION show_cities_multiple()
RETURNS SETOF refcursor AS $$
DECLARE
ref1 refcursor;
ref2 refcursor;
BEGIN
OPEN ref1 FOR SELECT user_id, user_name FROM users;
RETURN NEXT ref1;
OPEN ref2 FOR SELECT id, company FROM customers;
RETURN NEXT ref2;
END;
$$ LANGUAGE plpgsql;
第一個循環僅讀取記錄集名稱,這就是我可以從函數中讀取的全部內容。
NpgsqlConnection conn = new NpgsqlConnection(GetConnectionString());
conn.Open();
NpgsqlTransaction tran = conn.BeginTransaction();
NpgsqlCommand command = new NpgsqlCommand("show_cities_multiple", conn);
command.CommandType = CommandType.StoredProcedure;
NpgsqlDataReader dr = command.ExecuteReader();
while (dr.Read())
{
Console.Write("{0}\n", dr[0]);
}
// ----------there is output - only names of cursors recordsets
// <unnamed portal 1>
// <unnamed portal 2>
dr.NextResult();
// But there is nothing to read, no additional recordsets
while (dr.Read())
Console.Write("{0}\t{1} \n", dr[0], dr[1]);
tran.Commit();
conn.Close();
怎么了? 如何從PGSQL函數讀取多個記錄集?
有幾種方法可以使用不同版本的游標
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