SQLNumParams

関数

準備済みSQL文のパラメータ数を取得する。

DLLODBC32.dll呼出規約winapi

シグネチャ

// ODBC32.dll
#include <windows.h>

SHORT SQLNumParams(
    void* hstmt,
    SHORT* pcpar   // optional
);

パラメーター

名前	型	方向
hstmt	void*	inout
pcpar	SHORT*	outoptional

戻り値の型: SHORT

各言語での呼び出し定義

// ODBC32.dll
#include <windows.h>

SHORT SQLNumParams(
    void* hstmt,
    SHORT* pcpar   // optional
);

[DllImport("ODBC32.dll", ExactSpelling = true)]
static extern short SQLNumParams(
    IntPtr hstmt,   // void* in/out
    IntPtr pcpar   // SHORT* optional, out
);

<DllImport("ODBC32.dll", ExactSpelling:=True)>
Public Shared Function SQLNumParams(
    hstmt As IntPtr,   ' void* in/out
    pcpar As IntPtr   ' SHORT* optional, out
) As Short
End Function

' hstmt : void* in/out
' pcpar : SHORT* optional, out
Declare PtrSafe Function SQLNumParams Lib "odbc32" ( _
    ByVal hstmt As LongPtr, _
    ByVal pcpar As LongPtr) As Integer
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

SQLNumParams = ctypes.windll.odbc32.SQLNumParams
SQLNumParams.restype = ctypes.c_short
SQLNumParams.argtypes = [
    ctypes.POINTER(None),  # hstmt : void* in/out
    ctypes.POINTER(ctypes.c_short),  # pcpar : SHORT* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ODBC32.dll')
SQLNumParams = Fiddle::Function.new(
  lib['SQLNumParams'],
  [
    Fiddle::TYPE_VOIDP,  # hstmt : void* in/out
    Fiddle::TYPE_VOIDP,  # pcpar : SHORT* optional, out
  ],
  Fiddle::TYPE_SHORT)

#[link(name = "odbc32")]
extern "system" {
    fn SQLNumParams(
        hstmt: *mut (),  // void* in/out
        pcpar: *mut i16  // SHORT* optional, out
    ) -> i16;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ODBC32.dll")]
public static extern short SQLNumParams(IntPtr hstmt, IntPtr pcpar);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ODBC32_SQLNumParams' -Namespace Win32 -PassThru
# $api::SQLNumParams(hstmt, pcpar)

#uselib "ODBC32.dll"
#func global SQLNumParams "SQLNumParams" sptr, sptr
; SQLNumParams hstmt, varptr(pcpar)   ; 戻り値は stat
; hstmt : void* in/out -> "sptr"
; pcpar : SHORT* optional, out -> "sptr"
; ※HSP3.7は #func のため戻り値はシステム変数 stat に格納されます。

出力引数:

#uselib "ODBC32.dll"
#cfunc global SQLNumParams "SQLNumParams" sptr, var
; res = SQLNumParams(hstmt, pcpar)
; hstmt : void* in/out -> "sptr"
; pcpar : SHORT* optional, out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。#uselib "ODBC32.dll"
#cfunc global SQLNumParams "SQLNumParams" sptr, sptr
; res = SQLNumParams(hstmt, varptr(pcpar))
; hstmt : void* in/out -> "sptr"
; pcpar : SHORT* optional, out -> "sptr"
; ※出力/バッファ引数はポインタ方式(token=sptr / 呼び出しは varptr(変数))。

出力引数:

; SHORT SQLNumParams(void* hstmt, SHORT* pcpar)
#uselib "ODBC32.dll"
#cfunc global SQLNumParams "SQLNumParams" intptr, var
; res = SQLNumParams(hstmt, pcpar)
; hstmt : void* in/out -> "intptr"
; pcpar : SHORT* optional, out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。; SHORT SQLNumParams(void* hstmt, SHORT* pcpar)
#uselib "ODBC32.dll"
#cfunc global SQLNumParams "SQLNumParams" intptr, intptr
; res = SQLNumParams(hstmt, varptr(pcpar))
; hstmt : void* in/out -> "intptr"
; pcpar : SHORT* optional, out -> "intptr"
; ※出力/バッファ引数はポインタ方式(token=intptr / 呼び出しは varptr(変数))。

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	odbc32 = windows.NewLazySystemDLL("ODBC32.dll")
	procSQLNumParams = odbc32.NewProc("SQLNumParams")
)

// hstmt (void* in/out), pcpar (SHORT* optional, out)
r1, _, err := procSQLNumParams.Call(
	uintptr(hstmt),
	uintptr(pcpar),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // SHORT

function SQLNumParams(
  hstmt: Pointer;   // void* in/out
  pcpar: Pointer   // SHORT* optional, out
): Smallint; stdcall;
  external 'ODBC32.dll' name 'SQLNumParams';

result := DllCall("ODBC32\SQLNumParams"
    , "Ptr", hstmt   ; void* in/out
    , "Ptr", pcpar   ; SHORT* optional, out
    , "Short")   ; return: SHORT

●SQLNumParams(hstmt, pcpar) = DLL("ODBC32.dll", "int SQLNumParams(void*, void*)")
# 呼び出し: SQLNumParams(hstmt, pcpar)
# hstmt : void* in/out -> "void*"
# pcpar : SHORT* optional, out -> "void*"
# なでしこ1は32bit・ANSI(Shift_JIS)。文字列=char*(ANSI)、ポインタ/ハンドル=void*(4byte)。