我在编写用户权限部分时,在"无法获得连接句柄!ODBC API执行错误"后实行不下去,源代码如下:(这是一个模块)
'== 声明odbc32.dll中定义的ODBC API函数 ==
Public Declare Function SQLAllocEnv Lib "odbc32.dll" (phenv&) As Integer
Public Declare Function SQLAllocConnect Lib "odbc32.dll" (ByVal Henv&, phdbcd&) As Integer
Public Declare Function SQLAllocStmt Lib "odbc32.dll" (ByVal Hdbc&, phstmt&) As Integer
Public Declare Function SQLConnect Lib "odbc32.dll" (ByVal Hdbc&, ByVal szDSN$, _
ByVal cbDSN%, ByVal szUID$, ByVal cbUID%, ByVal szPWD$, ByVal cbPWD%) As Integer
Public Declare Function SQLColAttributes Lib "odbc32.dll" (ByVal Hstmt&, ByVal icol%, _
ByVal fDescType%, ByVal rgbDesc As String, ByVal cbDescMax%, pcbDesc%, pfDesc&) As Integer
Public Declare Function SQLDisconnect Lib "odbc32.dll" (ByVal Hdbc&) As Integer
Public Declare Function SQLExecDirect Lib "odbc32.dll" (ByVal Hstmt&, ByVal szSqlStr$, _
ByVal cbSqStr&) As Integer
Public Declare Function SQLFetch Lib "odbc32.dll" (ByVal Hstmt&) As Integer
Public Declare Function SQLFreeConnect Lib "odbc32.dll" (ByVal Hdbc&) As Integer
Public Declare Function SQLFreeEnv Lib "odbc32.dll" (ByVal Henv&) As Integer
Public Declare Function SQLFreeStmt Lib "odbc32.dll" (ByVal Hstmt&, ByVal fOption%) As Integer
Public Declare Function SQLGetData Lib "odbc32.dll" (ByVal Hstmt&, ByVal icol%, ByVal fCType%, _
ByVal rgbValue As String, ByVal cbValueMax&, pcbValue%) As Integer
Public Declare Function SQLNumResultCols Lib "odbc32.dll" (ByVal Hstmt&, pccol%) As Integer
Public Declare Function SQLGetDiagRec Lib "odbc32.dll" (ByVal HandleType%, ByVal Handle&, _
ByVal RecNumber%, Sqlstate%, NativeErrorPtr%, MessageText As String, _
ByVal Bufferlenchgth%, TextlenchgthPtr%)
'== 标记数据库是否连接 ==
Private IsConnect As Boolean
'== 标记执行Connect()函数后,访问数据库的次数 ==
Private Connect_Num As Integer
Private Henv As Long '环境句柄
Private Hdbc As Long '连接句柄
Private Rc As Long
Public Hstmt As Long'连接数据库
Private Sub Connect()
Dim TmpStat As Long 'SQLConnect()函数的返回值
'如果连接标记为真,则返回。否则会出错
If IsConnect = True Then
Exit Sub
End If
'分配环境句柄,保存在变量Henv中
If SQLAllocEnv(Henv) Then
MsgBox "无法初始化ODBC环境!", , "ODBC API执行错误"
End
End If
'根据环境句柄,分配连接句柄,保存在变量Hdbc中
If SQLAllocConnect(Henv, Hdbc) Then
MsgBox "无法连接ODBC!", , "ODBC API执行错误"
End
End If
'根据连接句柄、数据源、用户名和密码连接指定的数据库
TmpStat = SQLConnect(Hdbc, DSN, Len(DSN), DB_USER_NAME, _
Lench(DB_USER_NAME), DB_PASSWORD, Len(DB_PASSWORD))
'如果连接不成功则退出程序
If TmpStat <> SQL_SUCCESS And _
TmpStat <> SQL_SUCCESS_WITH_INFO Then
MsgBox "无法获得连接句柄!", , "ODBC API执行错误"
IsConnect = True
Disconnect
End
End If
'设置连接标记
IsConnect = True
End Sub'断开与数据库的连接
Private Sub Disconnect()
Dim Rc As Long
'如果连接标记为假,标明已经断开连接,则直接返回
If IsConnect = False Then
Exit Sub
End If
'断开连接
Rc = SQLDisconnect(Hdbc)
'释放连接句柄
Rc = SQLFreeConnect(Hdbc)
'释放环境句柄
Rc = SQLFreeEnv(Henv)
IsConnect = False
End Sub'使用Connect_Num控制数据库连接
Public Sub DB_Connect()
Connect_Num = Connect_Num + 1
Connect
End Sub
Public Sub DB_Disconnect()
If Connect_Num >= CONNECT_LOOP_MAX Then
Connect_Num = 0
Disconnect
End If
End Sub
'强制关闭api方式访问的数据库,计数器复位
Public Sub DBapi_Disconnect()
Connect_Num = 0
Disconnect
End Sub'执行ODBC数据库操作语句
Public Sub OdbcExt(ByVal TmpSQLstmt As String)
'根据连接句柄,分配语句句柄
If SQLAllocStmt(Hdbc, Hstmt) Then
MsgBox "句柄分配失败", , "ODBC API执行错误"
DBapi_Disconnect
End
End If
'执行SQL语句,Lench是用户自定义函数,计算包含汉字的字符串长度
If SQLExecDirect(Hstmt, TmpSQLstmt, Lench(TmpSQLstmt)) Then
MsgBox "数据库访问语句执行失败", , "ODBC API执行错误"
MsgBox TmpSQLstmt
DBapi_Disconnect
End
End If
End Sub'使用Data控件连接数据库,将执行指定的SQL语句
Public Sub DBdataExt(TmpData As Data, ByVal TmpSource As String)
'关闭已有的ODBC连接
DBapi_Disconnect
'Data控件连接数据库
TmpData.Connect = "ODBC;DATABASE=" + Database _
+ ";UID=" + DB_USER_NAME + ";PWD=" _
+ DB_PASSWORD + ";DSN=" + DB_NAME
TmpData.RecordSource = TmpSource
TmpData.Refresh
End Sub
'== 声明odbc32.dll中定义的ODBC API函数 ==
Public Declare Function SQLAllocEnv Lib "odbc32.dll" (phenv&) As Integer
Public Declare Function SQLAllocConnect Lib "odbc32.dll" (ByVal Henv&, phdbcd&) As Integer
Public Declare Function SQLAllocStmt Lib "odbc32.dll" (ByVal Hdbc&, phstmt&) As Integer
Public Declare Function SQLConnect Lib "odbc32.dll" (ByVal Hdbc&, ByVal szDSN$, _
ByVal cbDSN%, ByVal szUID$, ByVal cbUID%, ByVal szPWD$, ByVal cbPWD%) As Integer
Public Declare Function SQLColAttributes Lib "odbc32.dll" (ByVal Hstmt&, ByVal icol%, _
ByVal fDescType%, ByVal rgbDesc As String, ByVal cbDescMax%, pcbDesc%, pfDesc&) As Integer
Public Declare Function SQLDisconnect Lib "odbc32.dll" (ByVal Hdbc&) As Integer
Public Declare Function SQLExecDirect Lib "odbc32.dll" (ByVal Hstmt&, ByVal szSqlStr$, _
ByVal cbSqStr&) As Integer
Public Declare Function SQLFetch Lib "odbc32.dll" (ByVal Hstmt&) As Integer
Public Declare Function SQLFreeConnect Lib "odbc32.dll" (ByVal Hdbc&) As Integer
Public Declare Function SQLFreeEnv Lib "odbc32.dll" (ByVal Henv&) As Integer
Public Declare Function SQLFreeStmt Lib "odbc32.dll" (ByVal Hstmt&, ByVal fOption%) As Integer
Public Declare Function SQLGetData Lib "odbc32.dll" (ByVal Hstmt&, ByVal icol%, ByVal fCType%, _
ByVal rgbValue As String, ByVal cbValueMax&, pcbValue%) As Integer
Public Declare Function SQLNumResultCols Lib "odbc32.dll" (ByVal Hstmt&, pccol%) As Integer
Public Declare Function SQLGetDiagRec Lib "odbc32.dll" (ByVal HandleType%, ByVal Handle&, _
ByVal RecNumber%, Sqlstate%, NativeErrorPtr%, MessageText As String, _
ByVal Bufferlenchgth%, TextlenchgthPtr%)
'== 标记数据库是否连接 ==
Private IsConnect As Boolean
'== 标记执行Connect()函数后,访问数据库的次数 ==
Private Connect_Num As Integer
Private Henv As Long '环境句柄
Private Hdbc As Long '连接句柄
Private Rc As Long
Public Hstmt As Long'连接数据库
Private Sub Connect()
Dim TmpStat As Long 'SQLConnect()函数的返回值
'如果连接标记为真,则返回。否则会出错
If IsConnect = True Then
Exit Sub
End If
'分配环境句柄,保存在变量Henv中
If SQLAllocEnv(Henv) Then
MsgBox "无法初始化ODBC环境!", , "ODBC API执行错误"
End
End If
'根据环境句柄,分配连接句柄,保存在变量Hdbc中
If SQLAllocConnect(Henv, Hdbc) Then
MsgBox "无法连接ODBC!", , "ODBC API执行错误"
End
End If
'根据连接句柄、数据源、用户名和密码连接指定的数据库
TmpStat = SQLConnect(Hdbc, DSN, Len(DSN), DB_USER_NAME, _
Lench(DB_USER_NAME), DB_PASSWORD, Len(DB_PASSWORD))
'如果连接不成功则退出程序
If TmpStat <> SQL_SUCCESS And _
TmpStat <> SQL_SUCCESS_WITH_INFO Then
MsgBox "无法获得连接句柄!", , "ODBC API执行错误"
IsConnect = True
Disconnect
End
End If
'设置连接标记
IsConnect = True
End Sub'断开与数据库的连接
Private Sub Disconnect()
Dim Rc As Long
'如果连接标记为假,标明已经断开连接,则直接返回
If IsConnect = False Then
Exit Sub
End If
'断开连接
Rc = SQLDisconnect(Hdbc)
'释放连接句柄
Rc = SQLFreeConnect(Hdbc)
'释放环境句柄
Rc = SQLFreeEnv(Henv)
IsConnect = False
End Sub'使用Connect_Num控制数据库连接
Public Sub DB_Connect()
Connect_Num = Connect_Num + 1
Connect
End Sub
Public Sub DB_Disconnect()
If Connect_Num >= CONNECT_LOOP_MAX Then
Connect_Num = 0
Disconnect
End If
End Sub
'强制关闭api方式访问的数据库,计数器复位
Public Sub DBapi_Disconnect()
Connect_Num = 0
Disconnect
End Sub'执行ODBC数据库操作语句
Public Sub OdbcExt(ByVal TmpSQLstmt As String)
'根据连接句柄,分配语句句柄
If SQLAllocStmt(Hdbc, Hstmt) Then
MsgBox "句柄分配失败", , "ODBC API执行错误"
DBapi_Disconnect
End
End If
'执行SQL语句,Lench是用户自定义函数,计算包含汉字的字符串长度
If SQLExecDirect(Hstmt, TmpSQLstmt, Lench(TmpSQLstmt)) Then
MsgBox "数据库访问语句执行失败", , "ODBC API执行错误"
MsgBox TmpSQLstmt
DBapi_Disconnect
End
End If
End Sub'使用Data控件连接数据库,将执行指定的SQL语句
Public Sub DBdataExt(TmpData As Data, ByVal TmpSource As String)
'关闭已有的ODBC连接
DBapi_Disconnect
'Data控件连接数据库
TmpData.Connect = "ODBC;DATABASE=" + Database _
+ ";UID=" + DB_USER_NAME + ";PWD=" _
+ DB_PASSWORD + ";DSN=" + DB_NAME
TmpData.RecordSource = TmpSource
TmpData.Refresh
End Sub
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