使用參數postgresql執行存儲過程

Question

我的Npgsql版本3.2.5-Postgresql 9.6

我收到CommandType.StoredProcedure此錯誤（但CommandType.Text有效）：

Npgsql.PostgresException：'42883：函數customer_select（pEmail =>文本，Password =>文本）不存在'

string sql3 = @"customer_select";

NpgsqlConnection pgcon = new NpgsqlConnection(pgconnectionstring);
pgcon.Open();
NpgsqlCommand pgcom = new NpgsqlCommand(sql3, pgcon);
pgcom.CommandType = CommandType.StoredProcedure;
pgcom.Parameters.AddWithValue(":pEmail", "myemail@hotmail.com");
pgcom.Parameters.AddWithValue(":pPassword", "eikaylie78");
NpgsqlDataReader pgreader = pgcom.ExecuteReader();

while (pgreader.Read()) {
    string name = pgreader.GetString(1);
    string surname = pgreader.GetString(2);
}

這是數據庫中的功能：

CREATE OR REPLACE FUNCTION public.customer_select(
    pemail character varying, ppassword character varying)
RETURNS SETOF "CustomerTest"
LANGUAGE 'plpgsql'
COST 100.0
AS $function$                                   
BEGIN 
    RETURN QUERY
        SELECT "CustomerTestId", "FirstName", "LastName", "Email", "Password"
        FROM public."CustomerTest"
        WHERE "Email" = pEmail AND "Password" = pPassword;
END; 
$function$;
ALTER FUNCTION public.customer_select(character varying, character varying)
OWNER TO postgres;

Answer 1

Npgsql確實支持命名參數，但是參數的大小寫與您的函數不匹配，請嘗試使用pemail而不是pEmail和ppassword而不是pPassword 。

請注意，將CommandType.Text與NTypesql相比使用CommandType.StoredProcedure並沒有什么特別的優勢-兩者最終都會做同樣的事情。 CommandType.StoredProcedure主要是為了簡化從SqlServer等的代碼移植。

Answer 2

根據該問題 ， NPS SQL不支持命名參數，因為PostgreSQL不支持。 但是您可以嘗試以下操作：

string sql3 = @"select * from customer_select(:pEmail, :pPassword)";    
NpgsqlConnection pgcon = new NpgsqlConnection(pgconnectionstring);
pgcon.Open();
NpgsqlCommand pgcom = new NpgsqlCommand(sql3, pgcon);
pgcom.CommandType = CommandType.Text;
pgcom.Parameters.AddWithValue("pEmail", "myemail@hotmail.com");
pgcom.Parameters.AddWithValue("pPassword", "eikaylie78");
NpgsqlDataReader pgreader = pgcom.ExecuteReader();

while (pgreader.Read()) {
    string name = pgreader.GetString(1);
    string surname = pgreader.GetString(2);
}

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