SQLDescribeCol

関数

結果セット列の名前や型などの属性を取得する。

DLLODBC32.dll文字セットANSI (-A)呼出規約winapi

シグネチャ

// ODBC32.dll  (ANSI / -A)
#include <windows.h>

SHORT SQLDescribeCol(
    void* StatementHandle,
    WORD ColumnNumber,
    BYTE* ColumnName,   // optional
    SHORT BufferLength,
    SHORT* NameLength,   // optional
    SHORT* DataType,   // optional
    DWORD* ColumnSize,   // optional
    SHORT* DecimalDigits,   // optional
    SHORT* Nullable   // optional
);

パラメーター

名前	型	方向
StatementHandle	void*	inout
ColumnNumber	WORD	in
ColumnName	BYTE*	outoptional
BufferLength	SHORT	in
NameLength	SHORT*	outoptional
DataType	SHORT*	outoptional
ColumnSize	DWORD*	outoptional
DecimalDigits	SHORT*	outoptional
Nullable	SHORT*	outoptional

戻り値の型: SHORT

各言語での呼び出し定義

// ODBC32.dll  (ANSI / -A)
#include <windows.h>

SHORT SQLDescribeCol(
    void* StatementHandle,
    WORD ColumnNumber,
    BYTE* ColumnName,   // optional
    SHORT BufferLength,
    SHORT* NameLength,   // optional
    SHORT* DataType,   // optional
    DWORD* ColumnSize,   // optional
    SHORT* DecimalDigits,   // optional
    SHORT* Nullable   // optional
);

[DllImport("ODBC32.dll", CharSet = CharSet.Ansi, ExactSpelling = true)]
static extern short SQLDescribeCol(
    IntPtr StatementHandle,   // void* in/out
    ushort ColumnNumber,   // WORD
    IntPtr ColumnName,   // BYTE* optional, out
    short BufferLength,   // SHORT
    IntPtr NameLength,   // SHORT* optional, out
    IntPtr DataType,   // SHORT* optional, out
    IntPtr ColumnSize,   // DWORD* optional, out
    IntPtr DecimalDigits,   // SHORT* optional, out
    IntPtr Nullable   // SHORT* optional, out
);

<DllImport("ODBC32.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function SQLDescribeCol(
    StatementHandle As IntPtr,   ' void* in/out
    ColumnNumber As UShort,   ' WORD
    ColumnName As IntPtr,   ' BYTE* optional, out
    BufferLength As Short,   ' SHORT
    NameLength As IntPtr,   ' SHORT* optional, out
    DataType As IntPtr,   ' SHORT* optional, out
    ColumnSize As IntPtr,   ' DWORD* optional, out
    DecimalDigits As IntPtr,   ' SHORT* optional, out
    Nullable As IntPtr   ' SHORT* optional, out
) As Short
End Function

' StatementHandle : void* in/out
' ColumnNumber : WORD
' ColumnName : BYTE* optional, out
' BufferLength : SHORT
' NameLength : SHORT* optional, out
' DataType : SHORT* optional, out
' ColumnSize : DWORD* optional, out
' DecimalDigits : SHORT* optional, out
' Nullable : SHORT* optional, out
Declare PtrSafe Function SQLDescribeCol Lib "odbc32" ( _
    ByVal StatementHandle As LongPtr, _
    ByVal ColumnNumber As Integer, _
    ByVal ColumnName As LongPtr, _
    ByVal BufferLength As Integer, _
    ByVal NameLength As LongPtr, _
    ByVal DataType As LongPtr, _
    ByVal ColumnSize As LongPtr, _
    ByVal DecimalDigits As LongPtr, _
    ByVal Nullable 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

SQLDescribeCol = ctypes.windll.odbc32.SQLDescribeCol
SQLDescribeCol.restype = ctypes.c_short
SQLDescribeCol.argtypes = [
    ctypes.POINTER(None),  # StatementHandle : void* in/out
    ctypes.c_ushort,  # ColumnNumber : WORD
    ctypes.POINTER(ctypes.c_ubyte),  # ColumnName : BYTE* optional, out
    ctypes.c_short,  # BufferLength : SHORT
    ctypes.POINTER(ctypes.c_short),  # NameLength : SHORT* optional, out
    ctypes.POINTER(ctypes.c_short),  # DataType : SHORT* optional, out
    ctypes.POINTER(wintypes.DWORD),  # ColumnSize : DWORD* optional, out
    ctypes.POINTER(ctypes.c_short),  # DecimalDigits : SHORT* optional, out
    ctypes.POINTER(ctypes.c_short),  # Nullable : SHORT* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ODBC32.dll')
SQLDescribeCol = Fiddle::Function.new(
  lib['SQLDescribeCol'],
  [
    Fiddle::TYPE_VOIDP,  # StatementHandle : void* in/out
    -Fiddle::TYPE_SHORT,  # ColumnNumber : WORD
    Fiddle::TYPE_VOIDP,  # ColumnName : BYTE* optional, out
    Fiddle::TYPE_SHORT,  # BufferLength : SHORT
    Fiddle::TYPE_VOIDP,  # NameLength : SHORT* optional, out
    Fiddle::TYPE_VOIDP,  # DataType : SHORT* optional, out
    Fiddle::TYPE_VOIDP,  # ColumnSize : DWORD* optional, out
    Fiddle::TYPE_VOIDP,  # DecimalDigits : SHORT* optional, out
    Fiddle::TYPE_VOIDP,  # Nullable : SHORT* optional, out
  ],
  Fiddle::TYPE_SHORT)

#[link(name = "odbc32")]
extern "system" {
    fn SQLDescribeCol(
        StatementHandle: *mut (),  // void* in/out
        ColumnNumber: u16,  // WORD
        ColumnName: *mut u8,  // BYTE* optional, out
        BufferLength: i16,  // SHORT
        NameLength: *mut i16,  // SHORT* optional, out
        DataType: *mut i16,  // SHORT* optional, out
        ColumnSize: *mut u32,  // DWORD* optional, out
        DecimalDigits: *mut i16,  // SHORT* optional, out
        Nullable: *mut i16  // SHORT* optional, out
    ) -> i16;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ODBC32.dll", CharSet = CharSet.Ansi)]
public static extern short SQLDescribeCol(IntPtr StatementHandle, ushort ColumnNumber, IntPtr ColumnName, short BufferLength, IntPtr NameLength, IntPtr DataType, IntPtr ColumnSize, IntPtr DecimalDigits, IntPtr Nullable);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ODBC32_SQLDescribeCol' -Namespace Win32 -PassThru
# $api::SQLDescribeCol(StatementHandle, ColumnNumber, ColumnName, BufferLength, NameLength, DataType, ColumnSize, DecimalDigits, Nullable)

#uselib "ODBC32.dll"
#func global SQLDescribeCol "SQLDescribeCol" sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr
; SQLDescribeCol StatementHandle, ColumnNumber, varptr(ColumnName), BufferLength, varptr(NameLength), varptr(DataType), varptr(ColumnSize), varptr(DecimalDigits), varptr(Nullable)   ; 戻り値は stat
; StatementHandle : void* in/out -> "sptr"
; ColumnNumber : WORD -> "sptr"
; ColumnName : BYTE* optional, out -> "sptr"
; BufferLength : SHORT -> "sptr"
; NameLength : SHORT* optional, out -> "sptr"
; DataType : SHORT* optional, out -> "sptr"
; ColumnSize : DWORD* optional, out -> "sptr"
; DecimalDigits : SHORT* optional, out -> "sptr"
; Nullable : 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 SQLDescribeCol "SQLDescribeCol" sptr, int, var, int, var, var, var, var, var
; res = SQLDescribeCol(StatementHandle, ColumnNumber, ColumnName, BufferLength, NameLength, DataType, ColumnSize, DecimalDigits, Nullable)
; StatementHandle : void* in/out -> "sptr"
; ColumnNumber : WORD -> "int"
; ColumnName : BYTE* optional, out -> "var"
; BufferLength : SHORT -> "int"
; NameLength : SHORT* optional, out -> "var"
; DataType : SHORT* optional, out -> "var"
; ColumnSize : DWORD* optional, out -> "var"
; DecimalDigits : SHORT* optional, out -> "var"
; Nullable : 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 SQLDescribeCol "SQLDescribeCol" sptr, int, sptr, int, sptr, sptr, sptr, sptr, sptr
; res = SQLDescribeCol(StatementHandle, ColumnNumber, varptr(ColumnName), BufferLength, varptr(NameLength), varptr(DataType), varptr(ColumnSize), varptr(DecimalDigits), varptr(Nullable))
; StatementHandle : void* in/out -> "sptr"
; ColumnNumber : WORD -> "int"
; ColumnName : BYTE* optional, out -> "sptr"
; BufferLength : SHORT -> "int"
; NameLength : SHORT* optional, out -> "sptr"
; DataType : SHORT* optional, out -> "sptr"
; ColumnSize : DWORD* optional, out -> "sptr"
; DecimalDigits : SHORT* optional, out -> "sptr"
; Nullable : 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 SQLDescribeCol(void* StatementHandle, WORD ColumnNumber, BYTE* ColumnName, SHORT BufferLength, SHORT* NameLength, SHORT* DataType, DWORD* ColumnSize, SHORT* DecimalDigits, SHORT* Nullable)
#uselib "ODBC32.dll"
#cfunc global SQLDescribeCol "SQLDescribeCol" intptr, int, var, int, var, var, var, var, var
; res = SQLDescribeCol(StatementHandle, ColumnNumber, ColumnName, BufferLength, NameLength, DataType, ColumnSize, DecimalDigits, Nullable)
; StatementHandle : void* in/out -> "intptr"
; ColumnNumber : WORD -> "int"
; ColumnName : BYTE* optional, out -> "var"
; BufferLength : SHORT -> "int"
; NameLength : SHORT* optional, out -> "var"
; DataType : SHORT* optional, out -> "var"
; ColumnSize : DWORD* optional, out -> "var"
; DecimalDigits : SHORT* optional, out -> "var"
; Nullable : 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 SQLDescribeCol(void* StatementHandle, WORD ColumnNumber, BYTE* ColumnName, SHORT BufferLength, SHORT* NameLength, SHORT* DataType, DWORD* ColumnSize, SHORT* DecimalDigits, SHORT* Nullable)
#uselib "ODBC32.dll"
#cfunc global SQLDescribeCol "SQLDescribeCol" intptr, int, intptr, int, intptr, intptr, intptr, intptr, intptr
; res = SQLDescribeCol(StatementHandle, ColumnNumber, varptr(ColumnName), BufferLength, varptr(NameLength), varptr(DataType), varptr(ColumnSize), varptr(DecimalDigits), varptr(Nullable))
; StatementHandle : void* in/out -> "intptr"
; ColumnNumber : WORD -> "int"
; ColumnName : BYTE* optional, out -> "intptr"
; BufferLength : SHORT -> "int"
; NameLength : SHORT* optional, out -> "intptr"
; DataType : SHORT* optional, out -> "intptr"
; ColumnSize : DWORD* optional, out -> "intptr"
; DecimalDigits : SHORT* optional, out -> "intptr"
; Nullable : 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")
	procSQLDescribeCol = odbc32.NewProc("SQLDescribeCol")
)

// StatementHandle (void* in/out), ColumnNumber (WORD), ColumnName (BYTE* optional, out), BufferLength (SHORT), NameLength (SHORT* optional, out), DataType (SHORT* optional, out), ColumnSize (DWORD* optional, out), DecimalDigits (SHORT* optional, out), Nullable (SHORT* optional, out)
r1, _, err := procSQLDescribeCol.Call(
	uintptr(StatementHandle),
	uintptr(ColumnNumber),
	uintptr(ColumnName),
	uintptr(BufferLength),
	uintptr(NameLength),
	uintptr(DataType),
	uintptr(ColumnSize),
	uintptr(DecimalDigits),
	uintptr(Nullable),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // SHORT

function SQLDescribeCol(
  StatementHandle: Pointer;   // void* in/out
  ColumnNumber: Word;   // WORD
  ColumnName: Pointer;   // BYTE* optional, out
  BufferLength: Smallint;   // SHORT
  NameLength: Pointer;   // SHORT* optional, out
  DataType: Pointer;   // SHORT* optional, out
  ColumnSize: Pointer;   // DWORD* optional, out
  DecimalDigits: Pointer;   // SHORT* optional, out
  Nullable: Pointer   // SHORT* optional, out
): Smallint; stdcall;
  external 'ODBC32.dll' name 'SQLDescribeCol';

result := DllCall("ODBC32\SQLDescribeCol"
    , "Ptr", StatementHandle   ; void* in/out
    , "UShort", ColumnNumber   ; WORD
    , "Ptr", ColumnName   ; BYTE* optional, out
    , "Short", BufferLength   ; SHORT
    , "Ptr", NameLength   ; SHORT* optional, out
    , "Ptr", DataType   ; SHORT* optional, out
    , "Ptr", ColumnSize   ; DWORD* optional, out
    , "Ptr", DecimalDigits   ; SHORT* optional, out
    , "Ptr", Nullable   ; SHORT* optional, out
    , "Short")   ; return: SHORT

●SQLDescribeCol(StatementHandle, ColumnNumber, ColumnName, BufferLength, NameLength, DataType, ColumnSize, DecimalDigits, Nullable) = DLL("ODBC32.dll", "int SQLDescribeCol(void*, int, void*, int, void*, void*, void*, void*, void*)")
# 呼び出し: SQLDescribeCol(StatementHandle, ColumnNumber, ColumnName, BufferLength, NameLength, DataType, ColumnSize, DecimalDigits, Nullable)
# StatementHandle : void* in/out -> "void*"
# ColumnNumber : WORD -> "int"
# ColumnName : BYTE* optional, out -> "void*"
# BufferLength : SHORT -> "int"
# NameLength : SHORT* optional, out -> "void*"
# DataType : SHORT* optional, out -> "void*"
# ColumnSize : DWORD* optional, out -> "void*"
# DecimalDigits : SHORT* optional, out -> "void*"
# Nullable : 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)。