VB6 用ODBC连接数据库

Dim hdbc As Long    '连接句柄
rc = SQLAllocConnect(henv, hdbc)    '获取连接句柄
MsgBox rc
If rc <> 0 Then
MsgBox "无法获取连接句柄"
rc = SQLFreeEnv(henv)
End
End If

#If Win32 Then
Declare Function SQLAllocEnv Lib "odbc32.dll" (env As Long) As Integer
Declare Function SQLFreeEnv Lib "odbc32.dll" (ByVal env As Long) As Integer
Declare Function SQLAllocConnect Lib "odbc32.dll" (ByVal env As Long, ldbc As Long) As Integer
Declare Function SQLConnect Lib "odbc32.dll" (ByVal ldbc As Long, ByVal Server As String, ByVal serverlen As Integer, ByVal uid As String, ByVal uidlen As Integer, ByVal pwd As String, ByVal pwdlen As Integer) As Integer
Declare Function SQLDriverConnect Lib "odbc32.dll" (ByVal ldbc As Long, ByVal hWnd As Long, ByVal szCSIn As String, ByVal cbCSIn As Integer, ByVal szCSOut As String, ByVal cbCSMax As Integer, cbCSOut As Integer, ByVal f As Integer) As Integer
Declare Function SQLFreeConnect Lib "odbc32.dll" (ByVal ldbc As Long) As Integer
Declare Function SQLDisconnect Lib "odbc32.dll" (ByVal ldbc As Long) As Integer
Declare Function SQLAllocStmt Lib "odbc32.dll" (ByVal ldbc As Long, lStmt As Long) As Integer
Declare Function SQLFreeStmt Lib "odbc32.dll" (ByVal lStmt As Long, ByVal EndOption As Integer) As Integer
Declare Function SQLTables Lib "odbc32.dll" (ByVal lStmt As Long, ByVal q As Long, ByVal cbq As Integer, ByVal o As Long, ByVal cbo As Integer, ByVal t As Long, ByVal cbt As Integer, ByVal tt As Long, ByVal cbtt As Integer) As Integer
Declare Function SQLExecDirect Lib "odbc32.dll" (ByVal lStmt As Long, ByVal sqlString As String, ByVal sqlstrlen As Long) As Integer
Declare Function SQLNumResultCols Lib "odbc32.dll" (ByVal lStmt As Long, NumCols As Integer) As Integer
Declare Function SQLDescribeCol Lib "odbc32.dll" (ByVal lStmt As Long, ByVal colnum As Integer, ByVal colname As String, ByVal Buflen As Integer, colnamelen As Integer, dtype As Integer, dl As Long, ds As Integer, n As Integer) As Integer
Declare Function SQLFetch Lib "odbc32.dll" (ByVal lStmt As Long) As Integer
Declare Function SQLGetData Lib "odbc32.dll" (ByVal lStmt As Long, ByVal col As Integer, ByVal wConvType As Integer, ByVal lpbBuf As String, ByVal dwbuflen As Long, lpcbout As Long) As Integer
Declare Function SQLGetInfo Lib "odbc32.dll" (ByVal ldbc As Long, ByVal hWnd As Long, ByVal szInfo As String, ByVal cbInfoMax As Integer, cbInfoOut As Integer) As Integer
Declare Function SQLError Lib "odbc32.dll" (ByVal env As Long, ByVal ldbc As Long, ByVal lStmt As Long, ByVal SQLState As String, NativeError As Long, ByVal Buffer As String, ByVal Buflen As Integer, Outlen As Integer) As Integer

#Else

Declare Function SQLAllocEnv Lib "odbc.dll" (env As Long) As Integer
Declare Function SQLFreeEnv Lib "odbc.dll" (ByVal env As Long) As Integer
Declare Function SQLAllocConnect Lib "odbc.dll" (ByVal env As Long, ldbc As Long) As Integer
Declare Function SQLConnect Lib "odbc.dll" (ByVal ldbc As Long, ByVal Server As String, ByVal serverlen As Integer, ByVal uid As String, ByVal uidlen As Integer, ByVal pwd As String, ByVal pwdlen As Integer) As Integer
Declare Function SQLDriverConnect Lib "odbc.dll" (ByVal ldbc As Long, ByVal hWnd As Integer, ByVal szCSIn As String, ByVal cbCSIn As Integer, ByVal szCSOut As String, ByVal cbCSMax As Integer, cbCSOut As Integer, ByVal f As Integer) As Integer

Declare Function SQLFreeConnect Lib "odbc.dll" (ByVal ldbc As Long) As Integer
Declare Function SQLDisconnect Lib "odbc.dll" (ByVal ldbc As Long) As Integer
Declare Function SQLAllocStmt Lib "odbc.dll" (ByVal ldbc As Long, lStmt As Long) As Integer
Declare Function SQLFreeStmt Lib "odbc.dll" (ByVal lStmt As Long, ByVal EndOption As Integer) As Integer
Declare Function SQLTables Lib "odbc.dll" (ByVal lStmt As Long, ByVal q As Long, ByVal cbq As Integer, ByVal o As Long, ByVal cbo As Integer, ByVal t As Long, ByVal cbt As Integer, ByVal tt As Long, ByVal cbtt As Integer) As Integer
Declare Function SQLExecDirect Lib "odbc.dll" (ByVal lStmt As Long, ByVal sqlString As String, ByVal sqlstrlen As Long) As Integer
Declare Function SQLNumResultCols Lib "odbc.dll" (ByVal lStmt As Long, NumCols As Integer) As Integer
Declare Function SQLDescribeCol Lib "odbc.dll" (ByVal lStmt As Long, ByVal colnum As Integer, ByVal colname As String, ByVal Buflen As Integer, colnamelen As Integer, dtype As Integer, dl As Long, ds As Integer, n As Integer) As Integer
Declare Function SQLFetch Lib "odbc.dll" (ByVal lStmt As Long) As Integer
Declare Function SQLGetData Lib "odbc.dll" (ByVal lStmt As Long, ByVal col As Integer, ByVal wConvType As Integer, ByVal lpbBuf As String, ByVal dwbuflen As Long, lpcbout As Long) As Integer
Declare Function SQLGetInfo Lib "odbc.dll" (ByVal ldbc As Long, ByVal hWnd As Integer, ByVal szInfo As String, ByVal cbInfoMax As Integer, cbInfoOut As Integer) As Integer
Declare Function SQLError Lib "odbc.dll" (ByVal env As Long, ByVal ldbc As Long, ByVal lStmt As Long, ByVal SQLState As String, NativeError As Long, ByVal Buffer As String, ByVal Buflen As Integer, Outlen As Integer) As Integer

#End If

Global glEnv As Long
Global glDbc As Long
Global sSQL As String
Global Const MAX_DATA_BUFFER = 255
Global Const SQL_SUCCESS = 0
Global Const SQL_SUCCESS_WITH_INFO = 1
Global Const SQL_ERROR = -1
Global Const SQL_NO_DATA_FOUND = 100
Global Const SQL_CLOSE = 0
Global Const SQL_DROP = 1
Global Const SQL_CHAR = 1
Global Const SQL_NUMERIC = 2
Global Const SQL_DECIMAL = 3
Global Const SQL_INTEGER = 4
Global Const SQL_SMALLINT = 5
Global Const SQL_FLOAT = 6
Global Const SQL_REAL = 7
Global Const SQL_DOUBLE = 8
Global Const SQL_VARCHAR = 12
Global Const SQL_DATA_SOURCE_NAME = 6
Global Const SQL_USER_NAME = 8