执行带有参数postgresql的存储过程

Question

我的 Npgsql 版本 3.2.5 - Postgresql 9.6

我在使用 CommandType.StoredProcedure 时遇到此错误（但 CommandType.Text 有效）：

Npgsql.PostgresException: '42883: function customer_select(pEmail => text, Password => text) does not exist'

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);
}

这是数据库中的函数：

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

根据 issue，NPS SQL 不支持命名参数，因为 PostgreSQL 不支持。但您可以尝试以下操作：

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);
}

据此issue

Answer 2

Npgsql 确实支持命名参数，但您的参数大小写与您的函数不匹配，尝试 pemail 而不是 pEmail 和 ppassword 而不是 pPassword .

请注意，在 Npgsql 中使用 CommandType.StoredProcedure 与 CommandType.Text 相比并没有特别的优势 - 两者最终都会做同样的事情。 CommandType.StoredProcedure主要是方便从SqlServer等移植代码

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