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****************************************************************
README.TXT File for Microsoft ODBC 2.5
(c) Copyright Microsoft (R) Corporation, 1995.
All Rights Reserved
****************************************************************
================================================================
INTRODUCTION
================================================================
This document contains release notes for Microsoft ODBC 2.5.
Information in this document should be considered to be the
most up-to-date of any source.
================================================================
CONTENTS
================================================================
This document contains the following information:
Section Description
======= ===========
1 Configuration Information
ODBC 2.5 Installation
System Requirements
RISC Platforms Not Supported
Components
32-Bit Multithreaded Drivers on Windows 95
ODBC Driver's Base Address
Language Library File
Header Files
3D Controls
ODBC.INF File
2 Installation Changes
Uninstall
Component Usage Count Tracking
File Usage Count Tracking
ODBC Installation Scenarios
Fresh Install Scenario
Uninstall Scenario
Upgrade/Replace Scenario
Installer Registration
Control Panel Changes
System DSNs
Administrator/Control Panel Setup
System DSN Setup Using Functions
New Installer Functions
ConfigDriver
SQLConfigDriver
SQLInstallTranslator
SQLRemoveDriver
SQLRemoveDriverManager
SQLRemoveTranslator
Modified Installer Functions
SQLConfigDataSource
SQLCreateDataSource
SQLGetPrivateProfileString
SQLInstallDriver
SQLInstallDriverManager
SQLInstallODBC
SQLManageDataSources
SQLWritePrivateProfileString
3 ODBC Function Changes
Rebinding with SQLBindCol
Attempting to Add Truncated Data with
SQLSetPos
pcbValue in SQLBindParameter
SQLSTATE S1C00 Returned By SQLPrepare
SQLSTATE 22005 RETURNED BY SQLExtendedFetch
and SQLFetch
SQLSTATE 22008 RETURNED BY SQLExtendedFetch
and SQLFetch
SQLSTATE 22012 RETURNED BY SQLGetData
Cursor Concurrency Set in SQLSetStmtOption
Error Message Format
Notes to Driver Writers
================================================================
SECTION 1: CONFIGURATION INFORMATION
================================================================
+++++++++++++++ODBC 2.5 INSTALLATION+++++++++++++++
If ODBC 2.5 components are being installed on an x86 platform
over MSDN, the version 2.5 components should replace the
corresponding ODBC 2.10 components. A new RELNOTES.HLP file
for ODBC 2.5 will replace this version 2.10 release notes help
file, and should be consulted for all ODBC 2.5 release notes.
The ODBC 2.5 files should be copied from the subdirectories of
\ODBC210B\X86\ODBC25 on MSDN, to the appropriate directories
on your computer, replacing the corresponding version 2.10
files. Header files should be copied to the \ODBCSDK\INCLUDE
directory. Library files should be copied to the
\ODBCSDK\INCLUDE directory. Redistributable files should be
copied to both the \ODBCSDK\REDIST32 and \WINDOWS\SYSTEM
(or \SYSTEM32) directories. If you are going to use
ODBC Test, the 32-bit ODBC Test file (ODBCTE32.EXE) should
also be copied.
+++++++++++++++SYSTEM REQUIREMENTS+++++++++++++++
ODBC 2.5 is supported on Microsoft Windows 95 and Windows NT 3.5
and 3.51. ODBC 2.5 does not have 16-bit components. Use
ODBC 2.10 for 16-bit applications.
+++++++++++++++RISC PLATFORMS NOT SUPPORTED+++++++++++++++
ODBC 2.5 will not be supported on RISC platforms. Use ODBC 2.10
on RISC platforms.
+++++++++++++++COMPONENTS+++++++++++++++
ODBC 2.5 consists of the following components:
Component Filename
Driver Manager ODBC32.DLL
Installer ODBCCP32.DLL
ODBCCP32.CPL
Cursor Library ODBCCR32.DLL
Language Library ODBCINT.DLL
Administrator ODBCAD32.EXE
Thunking Files DS32GT.DLL
ODBC16GT.DLL
ODBC32GT.DLL
Installer Help ODBCINST.HLP
ODBCINST.CNT
Header Files ODBCINST.H
SQL.H
SQLEXT.H
SQLTYPES.H
Lib Files ODBC32.LIB
ODBCCP32.LIB
ODBC 2.5 also uses the following thunking file that was
included in the ODBC 2.10 SDK. It is not included in
the ODBC 2.5 file list, so should be retained from the
ODBC 2.10 SDK.
Thunking File DS16GT.DLL
+++++++++++32-BIT MULTITHREADED DRIVERS ON WINDOWS 95+++++++++++
On Windows 95, a 32-bit multithreaded driver will not work when
a 16-bit application tries to use it. A 32-bit multithreaded
driver will work, on the other hand, with a 32-bit application.
The restriction on 16-bit applications occurs because Windows
95 does not support multiple threads within a 16-bit process
space.
The options for driver writers are as follows:
1. Write a driver that is multithreaded when running in a
32-bit process space, but single-threaded when running in a
16-bit process space. This allows maximum interoperability and
performance.
2. Write a multithreaded driver that does not work with 16-bit
applications on Windows 95. The driver will have decreased
interoperability, but will be simpler to write. A 16-bit driver
can be written as well.
3. Write a single-threaded driver that works with either
16- or 32-bit applications on Windows 95. The driver will have
maximum interoperability, but decreased performance.
+++++++++++++++ODBC DRIVER'S BASE ADDRESS+++++++++++++++
ODBC driver should be linked with a base address of 0x04C00000.
+++++++++++++++LANGUAGE LIBRARY FILES+++++++++++++++
All of the code that needs to be localized for all of the ODBC
core components has been centralized into the language
library, ODBCINT.DLL. This file includes all error strings and
all dialog boxes.
+++++++++++++++HEADER FILES+++++++++++++++
The standard and extended header files, SQL.H and SQLEXT.H,
have been modified in ODBC 2.5 to align with changes in the
X/Open CAE specification. All material in SQL.H that was
specific to Microsoft has been moved to SQLEXT.H. The format
of the file was changed so that the datatypes and return types
conform to the X/Open CAE specification. All material in
SQLEXT.H that has been adopted by the standard has been moved
to SQL.H.
If SQL.H and/or SQLEXT.H are included in driver or application
code, "-DWINDOWS" should be added to the compiler command when
building 16-bit drivers or applications.
SQLTYPES.H has been added to provide type definition for
program types in ODBC 2.5. SQLTYPES.H defines the handle
environment, SQL portable types for C, transfer types for
DATE, TIME, and TIMESTAMP, and bookmarks.
+++++++++++++++3D CONTROLS++++++++++++++
On Windows 95, ODBC 2.5 uses the native 3D controls of
Windows 95 instead of CTL3D32.DLL. All ODBC drivers must also
use the native 3D controls on Windows 95, not CTL3D32.DLL.
On Windows NT, the ODBC 2.5 core components will load the
Unicode version of CTL3D32.DLL.
+++++++++++++++ODBC.INF FILE++++++++++++++
In the Driver Specification Section of the ODBC.INF file, the
WinSysNTnn and WinSys95nn keywords (where nn is a number from
00 to 99) indicate that the files specified will be installed
on either Windows NT or Windows 95, but not on both. These
keywords allow developers to install files selectively.
A file can have the same name, but a different binary, for
Windows NT and Windows 95.
================================================================
SECTION 2: INSTALLATION CHANGES
================================================================
+++++++++++++++UNINSTALL+++++++++++++++
In the course of installing an application, a user can install
ODBC components, then uninstall the ODBC components. If the
ODBC files are not used by another application, then the files
are deleted. If the files are used by another application, the
registry entries for ODBC are changed, but the actual files are
not deleted.
ODBC components are uninstalled by component, not by file. The
ODBC components that can be uninstalled are the ODBC core
components, ODBC drivers, and ODBC translators. Any component
can be uninstalled, while the other components are left
installed. For example, you can uninstall the ODBC translators
while leaving the core components and drivers installed.
ODBC core components (which include the Driver Manager, Cursor
Library, Installer, Language Library, Administrator, thunking
files, etc.) are uninstalled as a whole. ODBC drivers and
translators, on the other hand, are installed driver by driver,
or translator by translator. Any number of ODBC drivers or
translators can be uninstalled, while other drivers and
translators are left installed.
The Uninstall process depends upon two types of registry
entries: a component usage count kept by the ODBC installer
functions, and file count tracking kept by application setup
programs. These registry entries are described below.
+++++++++++++++COMPONENT USAGE COUNT TRACKING+++++++++++++++
The ODBC installer functions change registry and
configuration information. With the exception of
SQLInstallODBC (see the SQLInstallODBC section below), they
do not copy and delete files. The application setup program
is responsible for copying and deleting files.
ODBC installer functions maintain in the registry a count of
the number of times that an ODBC component has been installed.
This count is kept for each of the three ODBC components: the
core components, the ODBC translators, and the ODBC drivers.
A separate component usage count is kept for each ODBC
translator and driver installed.
Each time an ODBC component is installed, an installation
function is called, and the component usage count is
incremented. The installation functions are
SQLInstallDriverManager, SQLInstallDriver, and
SQLInstallTranslator. Each time an ODBC component is
uninstalled, a removal function is called, and the component
usage count is decremented. The removal functions are
SQLRemoveDriverManager, SQLRemoveDriver, and
SQLRemoveTranslator.
When an ODBC installer function is called to install an
ODBC component for the first time, the function creates
the registry entry and increments the component usage
count, but does not copy the files. The application setup
program must do that. When the installer function is
called to install an ODBC component that has already been
installed, it again increments the component usage count.
When an ODBC installer function is called by the application
to uninstall a component, and the usage count reaches 0, the
installer function deletes the registry entry for that
component. It does not, however, delete the component files.
The application is responsible for deleting the files, and
must use the file usage count to determine if the deletion
should be performed (see the File Usage Count Tracking
section following this section).
The component usage count is kept in the following registry
entry:
Registry Subtree: HKEY_LOCAL_MACHINE
Registry Hive: SOFTWARE
Subtree: ODBC
Class Name: <NO CLASS>
Value Data Type: REG_DWORD
Value Name: UsageCount
Value Data: <Number of times this component was
installed>
The Key Name, which identifies the location of the component
usage count value, is specified in the following table:
Component Key Name (Registry Location)
ODBC Core Components SOFTWARE\ODBC\ODBCINST.INI\ODBC Core
ODBC Translators SOFTWARE\ODBC\ODBCINST.INI\<Translator
Name>
ODBC Drivers SOFTWARE\ODBC\ODBCINST.INI\<Driver Name>
+++++++++++++++FILE USAGE COUNT TRACKING+++++++++++++++
The files associated with each ODBC component are not copied or
deleted by the ODBC installer functions. These functions
manipulate the registry entries for the components. The files
are installed or deleted by the application setup program. It
is also the responsibility of the setup program to create,
change, and delete registry entries, as necessary, for all ODBC
files it installs or deletes. The registry entry includes a
file usage count that is the number of times that a file has
been installed.
When an application's setup program is called to uninstall
a component, it should call the appropriate removal function
(SQLRemoveDriverManager, SQLRemoveDriver, or
SQLRemoveTranslator), which will decrement the component
usage count. The setup program should then decrement the file
usage count. If the file usage count reaches 0, the setup
program should delete the file. If the file usage count does
not reach 0, the file should not be deleted.
+++++++++++++++ODBC INSTALLATION SCENARIOS+++++++++++++++
The ODBC installation functions are called according to one
of three installation scenarios: fresh install, uninstall,
or upgrade/replace.
+++++++++++++++FRESH INSTALL SCENARIO+++++++++++++++
When a fresh install is performed, the ODBC components have
not previously been installed. ODBC installation functions
are called in the following sequence, and the setup program
must perform the following actions. Additional information
on the ODBC installer functions is provided in later sections
of these release notes.
1. SQLInstallDriverManager is called to return the path for
ODBC core components and increment the component usage count.
The application setup program then installs the core component
files. If a newer version of a core component file has not
been previously installed, the application setup program
copies the file, and creates the file usage count. If a newer
version of a file has previously been installed, the setup
program increments the file usage count.
2. SQLInstallDriver is called for each driver to add
information about the driver to the ODBCINST.INI section of
the registry, return the path for the driver, and increment
the driver usage count. The application setup program then
installs the driver files. If a newer version of a driver file
has not been previously installed, the application setup program
copies the file, and creates the file usage count. If a newer
version of a file has previously been installed, the setup
program increments the file usage count.
3. SQLConfigDriver (a new function) is called with the
ODBC_INSTALL_DRIVER fOption to call the driver setup DLL. The
driver setup DLL calls the ConfigDriver function to set
configuration for the driver. (The application setup program
must have installed the driver files, if necessary, before
this step can be performed.)
4. SQLInstallTranslator (a new function) is called to add
information about the translator to the ODBCINST.INI section of
the registry, and increment the translator's component usage
count. The application setup program then installs the
translator files. If a newer version of a translator file has
not been previously installed, the application setup program
copies the file, and creates the file usage count. If a newer
version of a file has previously been installed, the setup
program increments the file usage count.
+++++++++++++++UNINSTALL SCENARIO+++++++++++++++
When an application setup program is called to perform an
Uninstall, the ODBC component has previously been installed
by the application. ODBC installation functions are called in
the following sequence, and the setup program must perform the
following actions. Additional information on the ODBC installer
functions is provided in later sections of these release notes.
1. SQLRemoveTranslator is called to remove information about
the translator from the ODBCINST.INI section of the registry,
and decrement the translator's component usage count. If the
component usage count falls to 0, the function removes the
translator information (including the usage count) from the
registry. For each translator file, the application setup
program should check the file usage count. If the file usage
count has fallen to 0, the setup program should delete the
file.
2. SQLRemoveDriver is called to remove information about the
driver from the ODBCINST.INI section of the registry and
decrement the driver usage count. If the component usage count
falls to 0, the function removes the driver information
(including the component usage count) from the registry, and
calls SQLConfigDriver with the ODBC_REMOVE_DRIVER fOption.
SQLConfigDriver calls the ConfigDriver function, which modifies
the configuration as necessary. For each driver file, the
application setup program should check the file usage count.
If the file usage count has fallen to 0, the setup program
should delete the file.
3. SQLRemoveDriverManager is called to decrement the Driver
Manager component usage count. If the component usage count
falls to 0, the function removes the Driver Manager information
(including the usage count) from the registry. For each core
component file, the application setup program should check
the file usage count. If the file usage count has fallen to 0,
the setup program should delete the file.
+++++++++++++++UPGRADE/REPLACE SCENARIO+++++++++++++++
When a component is upgraded or replaced, the component should
be removed before being reinstalled, so that the component usage
count is valid. All steps in the Uninstall scenario
(SQLRemoveTranslator, SQLConfigDriver, SQLRemoveDriver, and
SQLRemoveDriverManager) should be performed, then all steps in
the Fresh Install scenario (SQLInstallDriverManager,
SQLInstallDriver, SQLConfigDriver, and SQLInstallTranslator)
should be performed. (See the Fresh Install Scenario and
Uninstall Scenario sections for more information.)
+++++++++++++++INSTALLER REGISTRATION+++++++++++++++
The ODBC installer in ODBC 2.5 is registered by copying the
ODBCCP32.CPL file to the system directory. This action loads
the control panel device. The ODBC installer no longer modifies
the MMCPL entry in the registry and the CONTROL.INI file
directly. When run, the ODBCCP32.CPL control panel device
deletes any existing ODBC entry in the MMCPL registry key.
+++++++++++++++CONTROL PANEL CHANGES+++++++++++++++
The Add and Delete buttons have been removed from the Drivers
dialog box that is displayed when the ODBC icon in the Control
Panel (or Administrator) is chosen, then the Drivers button
in the Data Sources dialog box is chosen. The buttons were
removed because this program has not yet been redesigned to
modify the registry or remove files properly.
A System DSN button has been added to the Data Source dialog
box. For information on this change, see the following System
DSNs section.
+++++++++++++++SYSTEM DSNs++++++++++++++
ODBC 2.5 supports the creation of a system data-source name
(DSN). A data source set up with a system DSN can be used by
more than one user on the same machine. It can also be used
by a system-wide service, which can then gain access to the
data source even if no user is logged onto the machine.
A system DSN is registered in the HKEY_LOCAL_MACHINE registry,
rather than the HKEY_CURRENT_USER registry. It is not tied to
one user who logs on with their particular user name and
password, but can be used by any user of that machine, or by
an automatic system-wide service. The system DSN is, however,
tied to one machine. It does not support the capability of
using remote DSNs between machines.
System DSNs will be registered in the following registry
location:
Registry Subtree: HKEY_LOCAL_MACHINE
Registry Hive: SOFTWARE
Subtree: ODBC
Key: ODBC.INI
DSNs created for individual users, i.e., registered in the
HKEY_CURRENT_USER registry, as at present, will be called
user DSNs, to distinguish them from system DSNs.
System DSNs can be set up through the installer user
interface or API functions, as described below.
+++++++++++++++ADMINISTRATOR/CONTROL PANEL SETUP++++++++++++++
A System DSN button has been added to the Data Sources dialog
box displayed when the ODBC Administrator icon in the ODBC
group is chosen, or when the ODBC icon in the Control Panel
is chosen. When the System DSN button is chosen, a System Data
Sources dialog box is displayed with controls that allow you
to add or delete a system data source to your local computer,
or to set the configuration for a system data source.
+++++++++++++++SYSTEM DSN SETUP USING FUNCTIONS++++++++++++++
Five ODBC installer functions have been modified to
accommodate system DSNs. Applications can call these
functions in order to implement automatic or customized
interactive management of system DSNs.
SQLConfigDataSources has been changed to accommodate the
addition, configuration, and removal of system DSNs.
SQLCreateDataSource has been changed to add a System DSN
check box to the Add Data Source dialog box.
SQLManageDataSources has been changed to accommodate the
System DSN button in the Data Sources dialog box.
SQLGetPrivateProfileString and SQLWritePrivateProfileString
support configuration of system DSNs for existing drivers.
The system DSN works only if a driver reads from the registry
using SQLGetPrivateProfileString and writes to the registry
using SQLWritePrivateProfileString. If a driver reads from,
or writes to, the registry itself, the system DSN may not
work.
+++++++++++++++NEW INSTALLER FUNCTIONS+++++++++++++++
The following new installer and driver setup functions have
been added in ODBC 2.5 to support Uninstall and System DSNs.
The functions are described in the Uninstall and System DSN
sections above, and in detail below.
ConfigDriver
SQLConfigDriver
SQLInstallTranslator
SQLRemoveDriver
SQLRemoveDriverManager
SQLRemoveTranslator
+++++++++++++++ConfigDriver+++++++++++++++
Purpose: ConfigDriver allows a driver to perform install and
uninstall functions without requiring an application to call
ConfigDSN. This function will perform driver-specific
functions such as creating driver-specific INI files and
performing DSN conversions during installation, and cleaning
up INI files or registry modifications during Uninstall.
This function is exposed by the driver setup DLL.
Syntax: BOOL ConfigDriver (hwndParent, fRequest, lpszDriver,
lpszArgs, lpszMsg, cbMsgMax, pcbMsgOut)
Type Argument Use Description
HWND hwndParent Input Parent window handle.
WORD fRequest Input Type of request. fRequest
must contain one
of the following values:
ODBC_INSTALL_DRIVER:
installing a new driver
ODBC_REMOVE_DRIVER:
removing a driver
This option can also be
driver-specific, in which
case the first option will
be ODBC_CONFIG_DRIVER_MAX+1,
and additional options will
be incremented by 1 from
that value.
LPCSTR lpszDriver Input The name of the driver as
registered in the
ODBCINST.INI key of the
registry.
LPCSTR lpszArgs Input A null-terminated string
containing arguments for
a driver-specific fRequest.
LPSTR lpszMsg Output A null-terminated string
containing an output message
from the driver setup.
WORD cbMsgMax Input Length of lpszMsg.
WORD pcbMsgOut Output Total number of bytes
FAR * available to return in
lpszMsg. If the number of
bytes available to return
is greater than or equal to
cbMsgMax, the output message
in lpszMsg is truncated to
cbMsgMax-1 characters.
Returns: The function returns TRUE if it is successful.
It returns FALSE if it fails.
Comments: All drivers that make modifications at the time
ConfigDriver is called with the ODBC_INSTALL_DRIVER option
should properly delete or uninstall those modifications
when ConfigDriver is called with the ODBC_REMOVE_DRIVER
option.
Driver-Specific Options: An application can request driver-
specific features exposed by the driver by using the
fRequest argument. The fRequest for the first option will
be ODBC_CONFIG_DRIVER_MAX+1, and additional options will
be incremented by 1 from that value. Any arguments required
by the driver for that function should be provided in a
null-terminated string passed in the lpszArgs argument.
Drivers providing such functionality should maintain a
table of driver-specific options. The options should be
fully documented in driver documentation. Application
writers who make use of driver-specific options should
be aware that this use will make the application less
interoperable.
Messages: A driver setup routine can send a text message
to an application as null-terminated strings in the lpszMsg
buffer. The message will be truncated to cbMsgMax-1
characters by the ConfigDriver function if it is greater
than or equal to cbMsgMax characters.
+++++++++++++++SQLConfigDriver+++++++++++++++
Purpose: SQLConfigDriver loads the appropriate driver setup
DLL and calls the ConfigDriver function.
Syntax: BOOL SQLConfigDriver (hwndParent, fRequest, lpszDriver,
lpszArgs, lpszMsg, cbMsgMax, pcbMsgOut)
Type Argument Use Description
HWND hwndParent Input Parent window handle.
WORD fRequest Input Type of request. fRequest must
contain one of the following
values:
ODBC_INSTALL_DRIVER:
installing a new driver
ODBC_REMOVE_DRIVER: removing
a driver
This option can also be
driver-specific, in which
case the first option will
be ODBC_CONFIG_DRIVER_MAX+1,
and additional options will
be incremented by 1 from
that value.
LPCSTR lpszDriver Input The name of the driver as
registered in the ODBCINST.INI
key of the registry.
LPCSTR lpszArgs Input A null-terminated string
containing arguments for
a driver-specific fRequest.
LPSTR lpszMsg Output A null-terminated string
containing an output message
from the driver setup.
WORD cbMsgMax Input Length of lpszMsg.
WORD pcbMsgOut Output Total number of bytes
FAR * available to return in
lpszMsg. If the number of
bytes available to return
is greater than or equal to
cbMsgMax, the output message
in lpszMsg is truncated to
cbMsgMax-1.
Returns: The function returns TRUE if it is successful.
It returns FALSE if it fails.
Comments: SQLConfigDriver allows an application to call a
driverÆs ConfigDriver routine without having to know the name
and load the driver-specific setup DLL. A setup program calls
this function after the driver setup DLL has been installed.
The calling program should be aware that this function may not
be available for all drivers. In such a case, the calling
program should continue without error.
Driver-Specific Options: An application can request driver-
specific features exposed by the driver by using the
fRequest argument. The fRequest for the first option will
be ODBC_CONFIG_DRIVER_MAX+1, and additional options will
be incremented by 1 from that value. Any arguments required
by the driver for that function should be provided in a
null-terminated string passed in the lpszArgs argument.
Drivers providing such functionality should maintain a
table of driver-specific options. The options should be
fully documented in driver documentation. Application
writers who make use of driver-specific options should
be aware that this use will make the application less
interoperable.
Messages: A driver setup routine can send a text message
to an application as null-terminated strings in the lpszMsg
buffer. The message will be truncated to cbMsgMax-1
characters by the ConfigDriver function if it is greater
than or equal to cbMsgMax characters.
+++++++++++++++SQLInstallTranslator+++++++++++++++
Purpose: SQLInstallTranslator adds information about a
translator to the ODBCINST.INI section of the registry
and increments the translatorÆs UsageCount by 1.
Syntax: BOOL SQLInstallTranslator (lpszInfFile, lpszTranslator,
lpszPathIn, lpszPathOut, cbPathOutMax, pcbPathOut, fRequest,
lpdwUsageCount)
Type Argument Use Description
LPCSTR lpszInfFile Input Full path of the ODBC.INF file
or a null pointer.
If lpszInfFile is a null
pointer, lpszTranslator must
contain a list of keyword-value
pairs describing the
translator.
LPCSTR lpszTranslator Input If lpszInfFile is the path of
the ODBC.INF file, this must
be the key in the ODBC.INF file
that describes the translator.
If lpszInfFile is a null
pointer, this must contain a
list of keyword-value pairs
describing the translator.
The Translator and Setup keywords
have to be included in the
lpszTranslator string. The
translation DLL is listed with
the Translator keyword, and the
translator setup DLL is listed
with the Setup keyword.
LPCSTR lpszPathIn Input Full path of where the
translator is to be installed
or a null pointer. If lpszPath
is a null pointer, then the
translators will be installed
in the System directory.
LPSTR lpszPathOut Output The path of where the translator
should be installed. If the
translator has never been
installed, then lpszPathOut is
the same as lpszPathIn. If
there exists a prior
installation of the translator,
then lpszPathOut is the path of
the prior installation.
WORD cbPathOutMax Input Length of lpszPathOut.
WORD pcbPathOut Output Total number of bytes
FAR * available to return in
lpszPathOut. If the number of
bytes available to return is
greater than or equal to
cbPathOutMax, the output path
in lpszPathOut is truncated to
pcbPathOutMax-1 characters.
WORD fRequest Input Type of request. fRequest must
contain one of the following
values:
ODBC_INSTALL_INQUIRY: inquire
about where a translator can
be installed
ODBC_INSTALL_COMPLETE:
complete the installation
request
LPDWORD lpdwUsageCount Output The usage count of the
translator after this function
has been called.
Returns: The function returns TRUE if it is successful.
It returns FALSE if it fails.
Comments: SQLInstallTranslator provides a mechanism to install
just the translator. This function does not actually copy any
files. The calling program is responsible for copying the
translator files.
If a version of the translator already exists, but
the UsageCount value for the translator does not exist, the
new UsageCount value is set to 2.
Length of the Path in lpszPathOut: SQLInstallTranslator
allows for a two-phase install process, so an application can
determine what cbPathOutMax should be by calling
SQLInstallTranslator with an fRequest of ODBC_INSTALL_INQUIRY
mode. This will return the total number of bytes available
in the pcbPathOut buffer.
SQLInstallTranslator can then be called with an fRequest of
ODBC_INSTALL_COMPLETE and the cbPathOutMax argument set to
the value in the pcbPathOut buffer, plus 1.
If you choose not to use the two-phase model for
SQLInstallTranslator, then you must set cbPathOutMax to
the value _MAX_PATH, as defined in STDLIB.H, to prevent
truncation.
When fRequest is ODBC_INSTALL_COMPLETE, SQLInstallTranslator
does not allow lpszPathOut to be NULL (or cbPathOutMax to
be 0). If fRequest is ODBC_INSTALL_COMPLETE, FALSE is
returned when the number of bytes available to return is
greater than or equal to cbPathOutMax, with the result
that truncation occurs.
+++++++++++++++SQLRemoveDriver+++++++++++++++
Purpose: SQLRemoveDriver removes information about the driver
from the ODBCINST.INI registry entry.
Syntax: BOOL SQLRemoveDriver (lpszDriver, fRemoveDSN,
lpdwUsageCount)
Type Argument Use Description
LPCSTR lpszDriver Input The name of the driver as
registered in the ODBCINST.INI
key of the registry.
BOOL fRemoveDSN Input The valid values are:
TRUE Remove DSNs associated
with the driver specified
in lpszDriver.
FALSE Do not remove DSNs
associated with the
driver specified in
lpszDriver.
LPDWORD lpdwUsageCount Output The usage count of the driver
after this function has been
called.
Returns: The function returns TRUE if it is successful.
It returns FALSE if it fails. If no entry exists in the
registry when this function is called, the function returns
FALSE.
Comments: SQLRemoveDriver complements the SQLInstallDriver
function, and updates the UsageCount. This function does not
actually remove any files. The calling program is responsible
for deleting files.
SQLRemoveDriver will decrement the UsageCount value by 1.
If the UsageCount goes to 0, then the following will occur:
1. SQLConfigDriver with the ODBC_REMOVE_DRIVER option will be
called. If the fRemoveDSN option is set to TRUE, the ConfigDSN
function calls SQLRemoveDSNFromIni to remove all the data
associated with the driver specified in lpszDriver.
2. The driver registry entry itself will be removed.
+++++++++++++++SQLRemoveDriverManager+++++++++++++++
Purpose: SQLRemoveDriverManager removes information about the
ODBC core components from the ODBCINST.INI registry entry.
Syntax: BOOL SQLRemoveDriverManager (lpdwUsageCount)
Type Argument Use Description
LPDWORD lpdwUsageCount Output The usage count of the Driver
Manager after this function
has been called.
Returns: The function returns TRUE if it is successful.
It returns FALSE if it fails. If no entry exists in the
registry when this function is called, the function returns
FALSE.
Comments: SQLRemoveDriverManager complements the
SQLInstallDriverManager function, and updates the UsageCount.
This function does not remove any files. The calling program
is responsible for deleting files.
SQLRemoveDriverManager will decrement the UsageCount value
of the ODBC core components by 1. If the UsageCount goes to
0, then the ODBC core component registry entry will be
removed.
+++++++++++++++SQLRemoveTranslator+++++++++++++++
Purpose: SQLRemoveTranslator removes information about a
translator from the ODBCINST.INI section of the registry
and decrements the translatorÆs UsageCount by 1.
Syntax: BOOL SQLRemoveTranslator (lpszTranslator,
lpdwUsageCount)
Type Argument Use Description
LPCSTR lpszTranslator Input The name of the translator as
registered in the ODBCINST.INI
key of the registry.
LPDWORD lpdwUsageCount Output The usage count of the
translator after this function
has been called.
Returns: The function returns TRUE if it is successful.
It returns FALSE if it fails. If no entry exists in the
registry when this function is called, the function returns
FALSE.
Comments: If the UsageCount goes to 0, then the translatorÆs
registry entry will be removed. This function does not remove
any files. The calling program is responsible for properly
removing the translator files.
+++++++++++++++MODIFIED INSTALLER FUNCTIONS+++++++++++++++
The following installer functions have been modified in
ODBC 2.5 to support Uninstall and System DSNs. To support full
backward compatibility, unless otherwise specified, all of the
modified APIs will support all existing functionality. The
functions are described in the Uninstall and System DSN
sections above, and in detail below.
SQLConfigDataSource
SQLCreateDataSource
SQLGetPrivateProfileString
SQLInstallDriver
SQLInstallDriverManager
SQLInstallODBC
SQLManageDataSources
SQLWritePrivateProfileString
+++++++++++++++SQLConfigDataSource+++++++++++++++
SQLConfigDataSource provides the same functionality as in the
ODBC 2.10 installer, with the addition of the following
SystemDSN options in the fRequest argument: ODBC_ADD_SYS_DSN,
ODBC_CONFIG_SYS_DSN, and ODBC_REMOVE_SYS_DSN. These options are
added to enable adding, removing, or changing the configuration
of a System DSN. The fRequest argument is now as follows:
Type Argument Use Description
HWND hwndParent Input Parent window handle. The
function will not display any
dialog boxes if the handle is
null.
WORD fRequest Input Type of request. fRequest must
contain one of the following
values:
ODBC_ADD_DSN: Add new user data
source.
ODBC_CONFIG_DSN: Modify an
existing data source.
ODBC_REMOVE_DSN: Remove an
existing data source.
ODBC_ADD_SYS_DSN: Add a new
system data source.
ODBC_CONFIG_SYS_DSN: Modify
an existing system data
source.
ODBC_REMOVE_SYS_DSN: Remove
an existing system data
source.
LPCSTR lpszDriver Input Driver description (usually the
name of the associated DBMS)
presented to users instead of
the physical driver name.
LPCSTR lpszAttributes Input List of attributes in the form
of keyword-value pairs. For
more information, see ConfigDSN
in the Microsoft ODBC 2.10
Programmer's Reference.
Returns: The function returns TRUE if it is successful.
It returns FALSE if it fails. If no entry exists in the
registry when this function is called, the function returns
FALSE.
SQLConfigDataSource maps the system DSN fRequests to the
user DSN fRequests (ODBC_ADD_SYS_DSN to ODBC_ADD_DSN,
ODBC_CONFIG_SYS_DSN to ODBC_CONFIG_DSN, and
ODBC_REMOVE_SYS_DSN to ODBC_REMOVE_DSN). To distinguish
user and system DSNs, SQLConfigDataSource sets the
wSystemDSN state variable according to the following table.
Prior to returning, SQLConfigDataSource resets wSystemDSN
to BOTHDSN.
fRequest wSystemDSN
ODBC_ADD_DSN USERDSN_ONLY
ODBC_CONFIG_DSN USERDSN_ONLY
ODBC_REMOVE_DSN USERDSN_ONLY
ODBC_ADD_SYS_DSN SYSTEMDSN_ONLY
ODBC_CONFIG_SYS_DSN SYSTEMDSN_ONLY
ODBC_REMOVE_SYS_DSN SYSTEMDSN_ONLY
+++++++++++++++SQLCreateDataSource+++++++++++++++
SQLCreateDataSource provides the same functionality as in the
ODBC 2.10 installer, with the addition of a System DSN check
box in the Add Data Source dialog box. This check box allows
the user to specify whether a user DSN or a system DSN should
be created. If a driver is chosen with the System DSN check box
selected, SQLCreateDataSource sets the wSystemDSN flag to
SYSTEMDSN_ONLY, and calls ConfigDSN in the driver
setup DLL with an fRequest of ODBC_ADD_DSN.
The System DSN check box is displayed whenever the
SQLCreateDataSource function is called to display the Add
Data Source dialog box, except when this dialog box is
displayed through the Control Panel. In this case, a data
source is added either from the Data Sources dialog box (for
user data sources) or from the System Data Sources dialog box,
so the System DSN check box is not needed.
+++++++++++++++SQLGetPrivateProfileString+++++++++++++++
This function gets a list of DSN values from the ODBC.INI entry
in the registry. A wSystemDSN state variable indicates where
the registry entry is. If the DSN is a User DSN (the state
variable is USERDSN_ONLY), the function reads from the ODBC.INI
entry in HKEY_CURRENT_USER. If the DSN is a system DSN
(SYSTEMDSN_ONLY), the ODBC.INI entry in HKEY_LOCAL_MACHINE is
used. If the state variable is BOTHDSN, HKEY_CURRENT_USER is
tried, and if it fails, then HKEY_LOCAL_MACHINE is used.
+++++++++++++++SQLInstallDriver+++++++++++++++
This function will perform the same functionality as listed in
the ODBC 2.10 ProgrammerÆs Reference. It will also increment
the UsageCount for the installed driver by 1. However, if a
version of the driver already exists, but the UsageCount value
for the driver does not exist, the new UsageCount value is set
to 2.
+++++++++++++++SQLInstallDriverManager+++++++++++++++
This function will perform the same functionality as listed in
the ODBC 2.10 ProgrammerÆs Reference. It will also increment
the UsageCount for the ODBC core components by 1. However, if
a version of the Driver Manager already exists, but the
UsageCount value for the core components does not exist, the
new UsageCount value is set to 2.
+++++++++++++++SQLInstallODBC+++++++++++++++
In addition to performing the same functions it currently does,
as described in the ODBC 2.10 Programmer's Reference, this
function will also perform the following:
1. Increment the component usage count of the ODBC core
components.
2. Increment the component usage count of the drivers being
installed.
3. Increment the component usage count of the translators being
installed.
4. Increment the file usage count of each file being installed.
5. Modify the FileList key with the appropriate files (see the
File Count Tracking section of this readme for more information).
Note that SQLInstallODBC is the only one of the ODBC
installer functions that actually copies files. SQLInstallODBC
does not support the Uninstall process. If an application's
setup program uses SQLInstallODBC, the application will not
be Windows 95 logo compliant.
SQLInstallODBC performs the same functions as
SQLInstallDriverManager, SQLInstallDriver, SQLConfigDriver
(with ODBC_INSTALL_DRIVER), and SQLInstallTranslator.
SQLInstallODBC does not perform the functions accomplished by
SQLRemoveTranslator, SQLConfigDriver (with SQL_REMOVE_DRIVER),
SQLRemoveDriver, and SQLRemoveDriverManager).
SQLInstallODBC should incorporate the removal functions, and so
support Uninstall and Windows 95 logo compliance, in ODBC 3.0.
+++++++++++++++SQLManageDataSources+++++++++++++++
SQLManageDataSources has been changed to accommodate the user
interface changes necessary to support system DSNs (see the
Administrator/Control Panel Setup section). The function
provides the same functionality as in the ODBC 2.10 installer,
with the addition of the SystemDSN button.
+++++++++++++++SQLWritePrivateProfileString+++++++++++++++
This function writes DSN information to the ODBC.INI entry in
the registry. A wSystemDSN state variable indicates where the
registry entry is. If the DSN is a User DSN (the state variable
is USERDSN_ONLY), the function writes to the ODBC.INI entry in
HKEY_CURRENT_USER. If the DSN is a system DSN (SYSTEMDSN_ONLY),
the ODBC.INI entry in HKEY_LOCAL_MACHINE is used. If the state
variable is BOTHDSN, HKEY_CURRENT_USER is used.
================================================================
SECTION 3: ODBC FUNCTION CHANGES
================================================================
The following changes have been made to the ODBC functions
documented in the ODBC 2.10 Programmer's Reference and SDK
Guide.
+++++++++++++++REBINDING WITH SQLBindCol+++++++++++++++
An application can call SQLBindCol to bind a column to a new
storage location, regardless of whether data has already been
fetched. The new binding replaces the old binding. This is true
for bookmark columns as well as other bound columns. Note that
the new binding does not apply to data already fetched--it
takes effect the next time SQLFetch, SQLExtendedFetch, or
SQLSetPos is called.
+++++++ATTEMPTING TO ADD TRUNCATED DATA WITH SQLSetPos+++++++
Using SQLSetPos with an fOption of SQL_ADD to add data from
a buffer that was truncated when bound by a call to
SQLBindCol, will result in a General-Protection Fault.
Prior to calling SQLSetPos with an fOption of SQL_ADD,
application writers should verify that the value pointed to by
pcbValue in the accompanying call to SQLBindCol is not greater
than cbValueMax.
+++++++++++++++pcbValue IN SQLBindParameter+++++++++++++++
When pcbValue in SQLBindParameter is SQL_DEFAULT_PARAM, the
corresponding parameter can only be a parameter for an ODBC
canonical procedure invocation.
SQLExecDirect, SQLExecute, and SQLPutData return SQLSTATE 07S01
(Invalid use of default parameter) when a parameter value was
set to SQL_DEFAULT_PARAM, and the corresponding parameter was
not a parameter for an ODBC canonical procedure invocation.
+++++++++++++SQLSTATE S1C00 RETURNED BY SQLPrepare+++++++++++++
SQLPrepare will return SQLSTATE S1C00 (Driver not capable) if
the cursor/concurrency combination is invalid.
+++SQLSTATE 22005 RETURNED BY SQLExtendedFetch and SQLFetch+++
SQLExtendedFetch and SQLFetch will return SQLSTATE 22005
(Error in assignment) if a zero-length string was inserted
into a string field, and the field was bound to a numeric data
type, so the string was converted to a zero.
+++SQLSTATE 22008 RETURNED BY SQLExtendedFetch and SQLFetch+++
SQLExtendedFetch and SQLFetch will return SQLSTATE 22008
(Datetime field overflow) if a SQL_C_TIME, SQL_C_DATE, or
SQL_C_TIMESTAMP value was converted to a SQL_CHAR data type,
and the value was, respectively, an invalid date, time, or
timestamp.
++++++++++++SQLSTATE 22012 RETURNED BY SQLGetData++++++++++++
SQLGetData will return SQLSTATE 22012 (Division by zero)
if a value from an arithmetic expression was returned that
resulted in division by zero.
+++++++++++CURSOR CONCURRENCY SET IN SQLSetStmtOption++++++++++
The default value for SQL_CONCURRENCY is SQL_CONCUR_READ_ONLY.
This option can also be set through the fConcurrency argument
in SQLSetScrollOptions. This option cannot be specified for
an open cursor.
If the SQL_CURSOR_TYPE fOption is changed to a type that does
not support the current value of SQL_CONCURRENCY, the value of
SQL_CONCURRENCY is not automatically changed to a supported
value, and no error will be reported until SQLExecDirect or
SQLPrepare is called.
If the driver supports the SELECT_FOR_UPDATE statement, and such
a statement is executed while the value of SQL_CONCURRENCY is
set to SQL_CONCUR_READ_ONLY, an error will be returned. If the
value of SQL_CONCURRENCY is changed to a value that the driver
supports for some value of SQL_CURSOR_TYPE, but not for the
current value of SQL_CURSOR_TYPE, the value of SQL_CURSOR_TYPE
is not automatically changed to a supported value, and no error
will be reported until SQLExecDirect or SQLPrepare is called.
++++++++++++++ERROR MESSAGE FORMAT+++++++++++++
Error messages returned by the Driver Manager have the
following format: [Microsoft][ODBC Driver Manager] message-text.
The old format was: [Microsoft][ODBC DLL] message-text.
++++++++++++++NOTES TO DRIVER WRITERS+++++++++++++
1. As described in the ODBC 2.0 Programmer's Reference,
the ODBC 2.0 Driver Manager uses ordinal number 199 to
determine whether or not to load functions by ordinal or by
name. If a driver does not define its functions in the
ordinal order defined by ODBC, it MUST not define ordinal
number 199. Note that by default, the Microsoft C/C++ compiler
defines ordinal values for all far functions, not only exported
functions. This can cause ordinal 199 to be defined even if
there is no function explicitly mapped to that ordinal.
To make sure the compiler doesn't assign ordinal values for
non-exported functions, include the "PROTMODE" statement in
the definition (.DEF) file that describes the dynamic-link
library. For more information, see "Building Drivers: Use
of PROTMODE Line in .DEF Files" in the ODBC SDK Knowledge
Base Help file.
2. An application might occasionally invoke a driver
connection while responding to a DDE Initiate request from
another application. If the driver displays a connect dialog
box and yields to Windows, it may cause unpredictable system
behavior. Therefore, drivers must call InSendMessage before
displaying any dialog or message boxes to see if they are
being called while the application is in SendMessage
processing. If so, only SYSTEM MODAL dialogs are permitted
so that Windows can block additional messages being sent
to the applications.
Drivers that support the asynchronous mode of ODBC
operations MUST not rely upon windows PeekMessage
functionality to emulate such support. This also applies
to ALL underlying components (network libraries, any
asynchronous DDEML based drivers, underlying data access
components, and so on). Any ODBC application that
implements asynchronous ODBC operations may show unexpected
behavior and cause the entire Windows system to become
unstable, if such a driver was used. Therefore, driver
writers must make sure that implementation of asynchronous
mode does not yield control to Windows.
3. For driver-specific options (>999), the thunking layer
checks to see if vParam is a valid pointer. If it is not,
vParam is passed unchanged as a 32-bit integer. In the case
where an application expects vParam to be an integer, and
the value for vParam happened to be a valid pointer, the
driver will receive an invalid 32-bit integer value.
In addition, if a driver tries to return a pointer in the
pvParam argument of SQLGetStmtOption for a driver-specific
option, it will not be translated. Instead of passing back
a pointer, the driver should copy the associated value back
into the calling application's buffer.