Re: Server side prepared statements 'bit' parameters generate errors.
От | Johan Levin |
---|---|
Тема | Re: Server side prepared statements 'bit' parameters generate errors. |
Дата | |
Msg-id | CAGWp_GhOA6iA_cRSd7+eBC=S1GVTP5_JqJg5E8wARTsyekoAAg@mail.gmail.com обсуждение исходный текст |
Ответ на | Re: Server side prepared statements 'bit' parameters generate errors. (Adrian Klaver <adrian.klaver@aklaver.com>) |
Список | pgsql-odbc |
Thanks. Digging in to the code I found the connection parameter BoolsAsChar. Setting that to "0" helps.
/Johan
On Tue, Oct 4, 2016 at 4:44 PM, Adrian Klaver <adrian.klaver@aklaver.com> wrote:
On 10/04/2016 07:35 AM, Johan Levin wrote:Hello
I have run into a problem after upgrading from 9.03 to the 9.05.04 ODBC
driver. Parameters of type 'bit' seem to be interpreted as 'char' in
some cases when using server side prepared statements.
If I execute the query
select * from some_table where ?;
with a bit parameter then I get an error that reads:
ERROR [42804] ERROR: argument of WHERE must be type boolean, not
type "char";
The error is not reproducible is I set the connection string
parameter UseServerSidePrepare=0. It also isn't reproducible in version
9.03 regardless of the value of UseServerSidePrepare. The problem seems
to only affect bit parameters. A program that duplicates the problem
follows at the end of this email. I am using the driver distributed in
"psqlodbc_09_05_0400-x64.zip" on Windows 10. I have tested PostgreSQL
version 9.4 and 9.5.
Have I run into a bug in the driver, or is this a server issue? Any help
would be much appreciated.
Got to believe it is related to:
https://odbc.postgresql.org/docs/release.html
"
psqlODBC 09.05.0100 Release
....
12. Send datatype information for query parameters, when known
If a query parameter is bound with a specific SQL type, pass on that information to the server. This makes the behaviour of queries like "SELECT '555' > ?" more sensible, where the result depends on whether the query parameter is interpreted as an integer or a string.
....--
"
Regards,
Johan Levin
Program listing: (C#)
using System.Data.Odbc;
using System.Diagnostics;
internal class Program
{
private static void Main(string[] args)
{
// Command line: Server, User, Password, Database,
UseServerSidePrepare
// Database schema and data:
// create table some_table (id int, name varchar(20));
// insert into some_table values (42, 'Arthur Dent');
Trace.Assert(args.Length == 5, "Wrong number of command line
arguments.");
var connStr = string.Format("Driver={{PostgreSQL
Unicode(x64)}};Server={0};Uid={1};Pwd={2};Database={3};UseSe rverSidePrepare={4}",
args);
using (var connection = new OdbcConnection(connStr))
using (var command = connection.CreateCommand())
{
connection.Open();
command.CommandText = "select * from some_table where ?;";
command.Parameters.Add(new OdbcParameter
{
OdbcType = OdbcType.Bit,
Value = 1
});
command.ExecuteNonQuery(); // <-- Exception here if
UseServerSidePrepare=1
// OdbcException.Message =
// ERROR [42804] ERROR: argument of WHERE must be type
boolean, not type "char";
// Error while executing the query
}
}
}
Adrian Klaver
adrian.klaver@aklaver.com
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