FoxPro .dbf ファイルを使用して分散クエリをSQL Serverする
この記事では、SQL Server分散クエリを実行して、VFP ODBC ドライバーまたは VFP OLE DB プロバイダーを使用して FoxPro .dbc ファイルと .dbf ファイルからデータを取得する方法について説明します。
元の製品バージョン: Visual FoxPro
元の KB 番号: 207595
概要
この記事では、SQL Server分散クエリを実行して、VFP ODBC ドライバーまたは VFP OLE DB プロバイダーを使用して FoxPro .dbc
と.dbf
ファイルからデータを取得する方法について説明します。
詳細
Microsoft SQL Server 2000 では、OLE DB プロバイダーに対してクエリを実行できます。 このクエリは、または OpenRowset
Transact-SQL 関数をOpenQuery
使用するか、リンク サーバー名を含む 4 部構成の名前を持つクエリを使用して実行します。
例:
sp_addlinkedserver 'mylinkedserver', 'product_name', 'myoledbprovider', 'data_source','location', 'provider_string', 'catalog'
SELECT * FROM OPENQUERY(mylinkedserver, 'select * from table1')
Microsoft OLE DB プロバイダー for ODBC (MSDASQL) と Visual FoxPro ODBC ドライバーを使用して、FoxPro .dbc
と .dbf
ファイルに対して分散クエリを実行するようにリンク サーバーを設定する必要があります。 FoxPro での Jet OLEDB プロバイダーの使用はサポートされていません。 VFP ODBC ドライバーはスレッド セーフではありません。 SQL Serverはマルチスレッドであるため、状況によっては VFP ODBC ドライバーによって問題が発生する可能性があります。 可能であれば、VFP OLE DB プロバイダーを使用して、SQL Server データに接続することをお勧めします。
次の T-SQL コード例は、OpenQuery 関数と OpenRowset 関数を使用して FoxPro で分散クエリを設定して使用する方法を示しています。 また、SQL Server 2000 からリモート FoxPro テーブルを更新する方法も示します。 このコードは、SQL Server 2000 コンピューターに Visual FoxPro ODBC ドライバーをインストールした後に SQL Query Analyzer でテストできます。 必要に応じて、データ ソースの名前と FoxPro ファイルへのパスを変更する必要があります。
/* OPENROWSET and OPENQUERY examples with VFP via ODBC OLE DB provider */
/* These OPENROWSET examples depend on the sample files VFP98\data\Testdata.dbc
Modify your code accordingly for differences in location or DBC name */
--====================================================
-- Using DBC file , read and update
--====================================================
-- OPENROWSET DSN-less example
select * from openrowset('MSDASQL',
'Driver=Microsoft Visual FoxPro Driver;
SourceDB=e:\VFP98\data\Testdata.dbc;
SourceType=DBC',
'select * from customer where country != "USA" order by country')
go
select * from openrowset('MSDASQL',
'Driver=Microsoft Visual FoxPro Driver;
SourceDB=e:\VFP98\data\Testdata.dbc;
SourceType=DBC',
'select * from customer where region="WA"')
go
Update openrowset('MSDASQL',
'Driver=Microsoft Visual FoxPro Driver;
SourceDB=e:\VFP98\data\Testdata.dbc;
SourceType=DBC',
'select * from customer where region="WA"')
set region = "Seattle"
go
-- check to verify which rows were updated
select * from openrowset('MSDASQL',
'Driver=Microsoft Visual FoxPro Driver;
SourceDB=e:\VFP98\data\Testdata.dbc;
SourceType=DBC',
'select * from customer where region="Seattle"')
go
-- OPENROWSET DSN example
/* Note the DSN Example might fail if SQL Server is configured to use a local account.*/
select * from openrowset('MSDASQL',
'DSN=Visual FoxPro Database;
SourceDB=e:\VFP98\data\Testdata.dbc;
SourceType=DBC',
'select * from customer where country != "USA" order by country'
go
/* sp_addlinkedserver examples */
-- sp_addlinkedserver example with DSN
/* You will need to make a DSN and point it to the Testdata database.
Modify your code accordingly for differences in location or DBC name */
/* Note this Example may fail if SQL Server is configured to use a local account.*/
sp_addlinkedserver 'VFP Testdata Database With DSN',
'',
'MSDASQL',
'VFP System DSN'
go
sp_addlinkedsrvlogin 'VFP Testdata Database With DSN', FALSE, NULL, NULL, NULL
go
SELECT *
FROM OPENQUERY([VFP Testdata Database With DSN], 'select * from customer where region = "Seattle"')
go
-- Update using OpenQuery
Update OPENQUERY([VFP Testdata Database With DSN], 'select * from customer where region="WA"')
set region = "Seattle"
go
/* SP_addlinkedserver example with DSN-less connection */
/* This example also depends on the sample files Testdata.dbc
Modify your code accordingly for differences in location or DBC name */
sp_addlinkedserver 'VFP Testdata Database With No DSN',
'',
'MSDASQL',
NULL,
NULL,
'Driver={Microsoft Visual FoxPro Driver};UID=;PWD=;SourceDB=e:\VFP98\data\Testdata.dbc;SourceType=DBC;Exclusive=No;BackgroundFetch=Yes;Collate=Machine;'
go
sp_addlinkedsrvlogin 'VFP Testdata Database With No DSN', FALSE, NULL, NULL, NULL
go
SELECT *
FROM OPENQUERY([VFP Testdata Database With No DSN], 'select * from customer where country != "USA" order by country')
go
--====================================================
-- Using VFP 6.0 driver, read and update data from VFP sample dbf files
--====================================================
-- OPENROWSET DSN-less example
select * from openrowset('MSDASQL',
'Driver=Microsoft Visual FoxPro Driver;
SourceDB=e:\VFP98\data;
SourceType=DBF',
'select * from customer where country != "USA" order by country')
go
-- perform UPDATE
Update openrowset('MSDASQL',
'Driver=Microsoft Visual FoxPro Driver;
SourceDB=e:\VFP98\data;
SourceType=DBF',
'select * from customer where region="Seattle"')
set region = "WA"
go
-- verify update
select * from openrowset('MSDASQL',
'Driver=Microsoft Visual FoxPro Driver;
SourceDB=e:\VFP98\data;
SourceType=DBF',
'select * from customer where region = "WA"')
go<BR/>
-- OPENROWSET DSN example
-- DSN points to the folder where .dbf files are.
/* Note this Example may fail if SQL Server is configured to use a local account.*/
select * from openrowset('MSDASQL',
'DSN=Visual FoxPro Tables;
SourceDB=e:\VFP98\data;
SourceType=DBF',
'select * from customer where country != "USA" order by country')
go"?
-- SQL Server's QUOTED_IDENTIFIER has to be set to OFF.
SET QUOTED_IDENTIFIER OFF
-- OPENROWSET DSN-less example
select * from openrowset('MSDASQL',
'Driver=Microsoft Visual FoxPro Driver;
SourceDB=e:\VFP90\samples\data\Testdata.dbc;
SourceType=DBC',
'select * from customer where country = "USA" order by city')
go
select * from openrowset('MSDASQL',
'Driver=Microsoft Visual FoxPro Driver;
SourceDB=e:\VFP90\samples\data\Testdata.dbc;
SourceType=DBC',
'select * from customer where region="WA"')
go
Update openrowset('MSDASQL',
'Driver=Microsoft Visual FoxPro Driver;
SourceDB=e:\VFP90\samples\data\Testdata.dbc;
SourceType=DBC',
'select * from customer where city = "Seattle"')
set region = "WW"
go
-- check to verify which rows were updated
select * from openrowset('MSDASQL',
'Driver=Microsoft Visual FoxPro Driver;
SourceDB=e:\VFP90\samples\data\Testdata.dbc;
SourceType=DBC',
'select * from customer where region="WW"')
go
-- OPENROWSET DSN example
/* Note the DSN Example might fail if SQL Server is configured to use a local account.*/
select * from openrowset('MSDASQL',
'DSN=Visual FoxPro Database;
SourceDB=e:\VFP90\samples\data\Testdata.dbc;
SourceType=DBC',
'select * from customer where country = "USA" order by city')
go
/* sp_addlinkedserver examples */
-- sp_addlinkedserver example with DSN
/* You will need to make a DSN and point it to the Testdata database.
Modify your code accordingly for differences in location or DBC name */
/* Note this Example may fail if SQL Server is configured to use a local account.*/
sp_addlinkedserver 'VFP Testdata Database With DSN',
'',
'MSDASQL',
'VFP System DSN'
go
sp_addlinkedsrvlogin 'VFP Testdata Database With DSN', FALSE, NULL, NULL, NULL
go
SELECT *
FROM OPENQUERY([VFP Testdata Database With DSN], 'select * from customer where city = "Seattle" ')
go
-- We will set the region back to "WA" if it currently is "WW".
-- Update using OpenQuery
Update OPENQUERY([VFP Testdata Database With DSN], 'select * from customer where city = "Seattle" ')
set region = "WA"
go
-- Make sure that the region got updated.
SELECT *
FROM OPENQUERY([VFP Testdata Database With DSN], 'select * from customer where city = "Seattle" ')
go
/* SP_addlinkedserver example with DSN-less connection */
/* This example also depends on the sample files Testdata.dbc
Modify your code accordingly for differences in location or DBC name */
sp_addlinkedserver 'VFP Testdata Database With No DSN',
'',
'MSDASQL',
NULL,
NULL,
'Driver={Microsoft Visual FoxPro Driver};UID=;PWD=;SourceDB=e:\VFP90\samples\data\Testdata.dbc;SourceType=DBC;Exclusive=No;BackgroundFetch=Yes;Collate=Machine;'
go
sp_addlinkedsrvlogin 'VFP Testdata Database With No DSN', FALSE, NULL, NULL, NULL
go
SELECT *
FROM OPENQUERY([VFP Testdata Database With No DSN], 'select * from customer where country = "USA" order by city')
go
--====================================================
-- Using VFP 6.0 driver, read and update data from VFP sample dbf files
--====================================================
-- OPENROWSET DSN-less example
select * from openrowset('MSDASQL',
'Driver=Microsoft Visual FoxPro Driver;
SourceDB=e:\VFP90\samples\data;
SourceType=DBF',
'select * from customer where country != "USA" order by country')
go
-- perform UPDATE
Update openrowset('MSDASQL',
'Driver=Microsoft Visual FoxPro Driver;
SourceDB=e:\VFP90\samples\data;
SourceType=DBF',
'select * from customer where city = "Seattle"')
set region = "WW"
go
-- verify update
select * from openrowset('MSDASQL',
'Driver=Microsoft Visual FoxPro Driver;
SourceDB=e:\VFP90\samples\data;
SourceType=DBF',
'select * from customer where region = "WW"')
go
-- OPENROWSET DSN example
-- DSN points to the folder where .dbf files are.
/* Note this Example may fail if SQL Server is configured to use a local account.*/
select * from openrowset('MSDASQL',
'DSN=Visual FoxPro Tables;
SourceDB=e:\VFP90\samples\data;
SourceType=DBF',
'select * from customer where country != "USA" order by country')
go
Visual FoxPro OLE DB プロバイダーを使用して、分散クエリを作成することもできます。 これは、使用するのが好ましい技術です。 このコードでは、データの更新と削除、OLE DB プロバイダーを使用した分散クエリでのデータの追加、更新 (編集)、削除の方法はサポートされていません。
次の T-SQL コード例は、OpenQuery と関数を使用して FoxPro で分散クエリを設定して OpenRowset
使用する方法を示しています。 このコードは、SQL Server 2000 コンピューターに Visual FoxPro OLE DB プロバイダーをインストールした後に SQL Query Analyzer でテストできます。 必要に応じて、データ ソースの名前と FoxPro ファイルへのパスを変更する必要があります。
'/* These OPENROWSET examples depend on the sample files VFP98\data\Testdata.dbc
'Modify your code accordingly for differences in location or DBC name */
--*====================================================
--* Using the DBC file, reading and updating data.
--*====================================================
--* A couple of OPENROWSET queries.
select * from openrowset('VFPOLEDB',
'e:\vfp7junk\Testdata.dbc';'Exclusive=No';'Data Source=DBC',
'select * from customer where country != "USA" order by country')
go
Select * from openrowset('VFPOLEDB',
'e:\vfp7junk\Testdata.dbc';'Exclusive=No';'Data Source=DBC',
'select * from customer where region="WA"')
go
--* Need to use an error trapping routine with the UPDATE and DELETE functions:
select * from
openrowset('VFPOLEDB',
'E:\VFP7Junk\Testdata.DBC';'Exclusive=No';'Data Source=DBC',
'Update Customer Set city = "SEATTLE" where region = "WA" ')
go
declare @upderror int
select @upderror = @@error
print ''
if @upderror != 7357 and @upderror != 0
print 'Update failed with error '+convert(varchar(5),@upderror)
else
print 'Ignore the error above, the Update succeeded'
go
-- check to verify which rows were updated
select * from openrowset('VFPOLEDB',
'E:\VFP7junk\Testdata.DBC';'Exclusive=No';'Data Source=DBC',
'select * from customer where region = "WA"')
go
--* Change the City field back to "Seattle".
select * from
openrowset('VFPOLEDB',
'E:\VFP7Junk\Testdata.DBC';'Exclusive=No';'Data Source=DBC',
'Update Customer Set city = "Seattle" where region = "WA" ')
go
declare @upderror int
select @upderror = @@error
print ''
if @upderror != 7357 and @upderror != 0
print 'Update failed with error '+convert(varchar(5),@upderror)
else
print 'Ignore the error above, the Update succeeded'
go
--* The DELETE fucntion also causes an error, but the DELETE works.
select * from
openrowset('VFPOLEDB',
'E:\VFP7Junk\Testdata.DBC';'Exclusive=No';'Data Source=DBC',
'Delete from Customer where country = "Spain" ')
go
declare @delerror int
select @delerror = @@error
print ''
if @delerror != 7357 and @delerror != 0
print 'Delete failed with error '+convert(varchar(5),@delerror)
else
print 'Ignore the error above, the Delete succeeded'
go
--* Check to see that the records are deleted.
Select * from openrowset('VFPOLEDB',
'e:\vfp7junk\Testdata.dbc';'Exclusive=No';'Data Source=DBC',
'select * from customer where country = "Spain"')
go
--* Here are some examples using the VFP OLE DB Provider to create Linked Servers.
--* Using sp_addlinkedserver to create the Linked Server.
sp_addlinkedserver @server='VFP_Linked_Server',
@srvproduct='Microsoft Visual FoxPro OLE DB Provider',
@provider='VFPOLEDB',
@datasrc = 'E:\vfp7junk'
go
SELECT *
FROM OPENQUERY([VFP_Linked_Server], 'select * from customer where city = "Seattle"')
go
-- The Update command will update the table with the OPENQUERY function when using the
-- linked server, but the same error 7357 error will occur.
select * from
OPENQUERY([VFP_Linked_Server],
'Update Customer Set city = "SEATTLE" where region = "WA" ')
go
declare @upderror int
select @upderror = @@error
print ''
if @upderror != 7357 and @upderror != 0
print 'Update failed with error '+convert(varchar(5),@upderror)
else
print 'Ignore the error above, the Update succeeded'
go
-- Check and see if the City field is all uppercase with "SEATTLE".
SELECT *
FROM OPENQUERY([VFP_Linked_Server], 'select * from customer where region = "WA"')
go
--* Let's check for how many records have the word "London" in the City field.
SELECT *
FROM OPENQUERY([VFP_Linked_Server], 'select * from customer where city = "London"')
go
-- We can also use the Delete command to remove records with the OPENQUERY function when using the
-- linked server, but the same error 7357 error will occur.
select * from
OPENQUERY([VFP_Linked_Server],
'Delete from Customer where city = "London"')
go
declare @delerror int
select @delerror = @@error
print ''
if @delerror != 7357 and @delerror != 0
print 'Delete failed with error '+convert(varchar(5),@delerror)
else
print 'Ignore the error above, the Delete succeeded'
go
/* SP_addlinkedserver example with DSN-less connection */
/* This example also depends on the sample files Testdata.dbc
Modify your code accordingly for differences in location or DBC name */
sp_addlinkedserver 'VFP Testdata Database With No DSN',
'',
'MSDASQL',
NULL,
NULL,
'Driver={Microsoft Visual FoxPro Driver};UID=;PWD=;SourceDB=e:\VFP8junk\Testdata.dbc;SourceType=DBC;Exclusive=No;BackgroundFetch=Yes;Collate=Machine;'
go
SELECT *
FROM OPENQUERY([VFP Testdata Database With No DSN], 'select * from customer where country = "USA" order by country')
go
関連情報
分散クエリの設定と使用の詳細については、SQL 7.0 オンライン ブックの OpenQuery、OpenRowset、および関連トピックを参照 sp_addlinkedserver
してください。
FoxPro と.dbf
.dbc
ファイルの詳細については、FoxPro 製品のドキュメントを参照してください。