[Mono-list] postgresql pinvoke sample
Daniel Morgan
danmorg@sc.rr.com
Fri, 12 Apr 2002 13:38:56 -0400
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Adam,
Here is the sample pinvoke to PostgreSQL that compiles and runs fine on
windows but fails compiling on linux that gonzalo tested.
- Daniel
-----Original Message-----
From: Daniel Morgan [mailto:danmorg@sc.rr.com]
Sent: Thursday, April 11, 2002 7:28 AM
To: Gonzalo Paniagua Javier
Cc: Rodrigo Moya
Subject:
Gonzalo,
I have put the PostgreSQL pinvoke C# sample as an attachment to make it
easier for you to compile and run it.
Notice, I'm using "pq" in the DllImport attribute instead of "pq.dll" or
"libpq.so".
Thanks,
Daniel
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<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Adam,<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Here is the sample <span =
class=3DSpellE>pinvoke</span>
to PostgreSQL that compiles and runs fine on windows but fails compiling =
on <span
class=3DSpellE>linux</span> that <span class=3DSpellE>gonzalo</span> =
tested.<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>- =
Daniel<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;
font-family:Tahoma'>-----Original Message-----<br>
<b><span style=3D'font-weight:bold'>From:</span></b> Daniel Morgan
[mailto:danmorg@sc.rr.com] <br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> =
</span></font><st1:date
Month=3D"4" Day=3D"11" Year=3D"2002"><font size=3D2 face=3DTahoma><span =
style=3D'font-size:
10.0pt;font-family:Tahoma'>Thursday, April 11, =
2002</span></font></st1:date><font
size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'> </span></font><st1:time
Hour=3D"7" Minute=3D"28"><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;
font-family:Tahoma'>7:28 AM</span></font></st1:time><font size=3D2 =
face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma'><br>
<b><span style=3D'font-weight:bold'>To:</span></b> Gonzalo Paniagua =
Javier<br>
<b><span style=3D'font-weight:bold'>Cc:</span></b> Rodrigo Moya<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> =
</span></font></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>Gonzalo,<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>I have put the PostgreSQL pinvoke C# sample as an attachment to =
make it
easier for you to compile and run it.<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>Notice, I’m using “pq” in the DllImport =
attribute
instead of “pq.dll” or =
“libpq.so”.<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>Thanks,<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>Daniel<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p> </o:p></span></font></p>
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using System;
using System.Runtime.InteropServices;
namespace ConsoleApplication1
{
/// <summary>
/// Summary description for Class1.
/// </summary>
class Class1
{
// PostgreSQL client library:
// under cygwin, it is pq.dll while under linux, it is libpq.so
[DllImport("pq")]
public static extern IntPtr PQconnectdb(String conninfo);
// PGconn *PQconnectdb(const char *conninfo)
[DllImport("pq")]
public static extern void PQfinish(IntPtr conn);
// void PQfinish(PGconn *conn)
=09
[DllImport("pq")]
public static extern IntPtr PQexec(IntPtr conn,
String query);
// PGresult *PQexec(PGconn *conn, const char *query);
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main(string[] args)
{
IntPtr dbconn;
String sConnInfo;
String sQuery;
sConnInfo =3D "host=3Dlocalhost dbname=3Dtest user=3Ddanmorg =
password=3Dviewsonic";
sQuery =3D "insert into sometable " +
"(tid,tdesc) " +
"values('pq','just pq') ";
dbconn =3D PQconnectdb(sConnInfo);
if(dbconn =3D=3D IntPtr.Zero)
Console.WriteLine("dbconn is null");
else
{
Console.WriteLine("assuming successful connection");
PQexec(dbconn,sQuery);
PQfinish(dbconn);
}
}
}
}
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