FoxPro でIBM Cloud Object Storage データを操作

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IBM Cloud Object Storage ODBC Driver

IBM Cloud Object Storage ODBC Driver を使って、ODBC 接続をサポートするあらゆるアプリケーション・ツールからIBM Cloud Object Storage にデータ連携。

IBM Cloud Object Storage データにデータベースと同感覚でアクセスして、IBM Cloud Object Storage データに使い慣れたODBC インターフェースで双方向連携。



IBM Cloud Object Storage をFoxPro データベースにロードします。この記事では、完全なコードとプロセスのウォークスルーを提供します。

CData ODBC Driver for IBM Cloud Object Storage は、ODBC スタンダードを使用してIBM Cloud Object Storage にアクセスすることを可能にします。また、CData ODBC Driver for IBM Cloud Object Storage を使用して、IBM Cloud Object Storage をFoxPro プロジェクトに統合することも可能です。以下のステップは、含まれているコードサンプルのウォークスルーを提供します。このコードでは、IBM Cloud Object Storage データをFoxPro データベースのテーブルに保存します。

ODBC Data Source としてIBM Cloud Object Storage に接続

未指定の場合は、初めにODBC DSN(data source name)で接続プロパティを指定します。ドライバーのインストールの最後にアドミニストレーターが開きます。Microsoft ODBC Data Source Administrator を使用して、ODBC DSN を作成および構成できます。

NOTE:[Map To WVarchar]接続プロパティをFALSE に設定します。(FoxPro はODBC W API を使用し、値タイプのWCHAR を返します。)

Register a New Instance of Cloud Object Storage

If you do not already have Cloud Object Storage in your IBM Cloud account, follow the procedure below to install an instance of SQL Query in your account:

  1. Log in to your IBM Cloud account.
  2. Navigate to the page, choose a name for your instance and click Create. You will be redirected to the instance of Cloud Object Storage you just created.

Connecting using OAuth Authentication

There are certain connection properties you need to set before you can connect. You can obtain these as follows:

API Key

To connect with IBM Cloud Object Storage, you need an API Key. You can obtain this as follows:

  1. Log in to your IBM Cloud account.
  2. Navigate to the Platform API Keys page.
  3. On the middle-right corner click "Create an IBM Cloud API Key" to create a new API Key.
  4. In the pop-up window, specify the API Key name and click "Create". Note the API Key as you can never access it again from the dashboard.

Cloud Object Storage CRN

If you have multiple accounts, you will need to specify the CloudObjectStorageCRN explicitly. To find the appropriate value, you can:

  • Query the Services view. This will list your IBM Cloud Object Storage instances along with the CRN for each.
  • Locate the CRN directly in IBM Cloud. To do so, navigate to your IBM Cloud Dashboard. In the Resource List, Under Storage, select your Cloud Object Storage resource to get its CRN.

Connecting to Data

You can now set the following to connect to data:

  • InitiateOAuth: Set this to GETANDREFRESH. You can use InitiateOAuth to avoid repeating the OAuth exchange and manually setting the OAuthAccessToken.
  • ApiKey: Set this to your API key which was noted during setup.
  • CloudObjectStorageCRN (Optional): Set this to the cloud object storage CRN you want to work with. While the connector attempts to retrieve this automatically, specifying this explicitly is recommended if you have more than Cloud Object Storage account.

When you connect, the connector completes the OAuth process.

  1. Extracts the access token and authenticates requests.
  2. Saves OAuth values in OAuthSettingsLocation to be persisted across connections.

接続して転送

開始するには、コードサンプルを新しいプロジェクトに追加します。以下のコマンドを実行することで、テーブルをすべて表示することなく保存できます。

DO C:\Temp\sqldump.prg WITH "CData IBMCloudObjectStorage Source", "TESTDB", .f.

以下は、プログラムが従うプロセスです。

  1. 新しいFoxPro データベースを作成します。
  2. 以下の行でIBM Cloud Object Storage への接続を開きます。

    m.hSQLconnection = SQLCONNECT(m.cODBCDSN)
  3. 接続が成功したら、SQLTABLES 関数を使用してテーブルのリストを取得できるようになります。以下のコードは、テーブルのリストをsys_tables.dbf に保存します。

    WAIT WINDOW "Fetching tables for data source '" + m.cODBCDSN + "'..."NOWAIT NOCLEAR m.nSQLTABLES = SQLTABLES(m.hSQLconnection) IF lUseDistinctConnections WAIT WINDOW "Closing ODBC Connection for data source '" + m.cODBCDSN + "'..."NOWAIT NOCLEAR SQLDISCONNECT(m.hSQLconnection) m.hSQLconnection = 0 * SQLCONNECT needs to be called again ENDIF IF m.nSQLTABLES > 0 * create local table containing list of tables in db COPY TO (m.cImportData + "sys_tables") USE * convert each table to DBF USE (m.cImportData + "sys_tables") ALTER TABLE DBF("sys_tables") ; ADD COLUMN records i ; ADD COLUMN dbfname m
  4. 各テーブルをスキャンしてDBF ファイルに保存します。関数ODBCtoDBF は、テーブルをDBF ファイルに格納し、lBrowse パラメータがtrue に設定されている場合はグリッドを開きます。 FUNCTION ODBCtoDBF (cTableName as String, cTableType as String, lBrowse as Logical, lhSQLConnection as Integer) WAIT WINDOW ; "Converting " + m.cTableType + ' "' + m.cTableName + '" to DBF...' ; NOWAIT NOCLEAR ACTIVATE SCREEN * strip characters incompatible with FoxPro out of the name of the DBF file m.cTableAlias = "" m.nTableNameLen = LEN(m.cTableName) m.nTableNameStart = 1 FOR m.nTableNameStart = 1 TO m.nTableNameLen m.cCharacter = SUBSTR(m.cTableName, m.nTableNameStart, 1) IF !ISALPHA(m.cCharacter) .and. (m.nTableNameStart = 1 .or. !ISDIGIT(m.cCharacter)) m.cTableAlias = m.cTableAlias + "_" ELSE m.cTableAlias = m.cTableAlias + m.cCharacter ENDIF ENDFOR m.cFromTable = m.cTableName m.cTempViewAlias = m.cTableType + "_" + m.cTableAlias LOCAL loException as Exception LOCAL lnResultSets TRY * run query m.lnResultSets = SQLEXEC(m.lhSQLConnection, ; "SELECT * FROM " + m.cFromTable, ; m.cTempViewAlias, ; aSQLResult) IF m.lnResultSets#1 SET STEP ON ENDIF ACTIVATE SCREEN CATCH TO m.loException ACTIVATE SCREEN ?"Error opening " + m.cTempViewAlias + ":" ? m.loException.Message ? m.loException.Details ENDTRY IF !USED(m.cTempViewAlias) RETURN ENDIF * copy records from view cursor to disk SELECT * FROM (m.cTempViewAlias) ; INTO TABLE (m.cImportData + m.cTableAlias) IF USED(m.cTableAlias) ACTIVATE SCREEN FLUSH && flush the buffer to write the data to disk IF m.lBrowse * pop the table up on screen SELECT (m.cTableAlias) BROWSE NORMAL NOMODIFY NOWAIT ACTIVATE SCREEN ELSE * close on-disk table for now USE IN (m.cTableAlias) ACTIVATE SCREEN ENDIF ENDIF IF USED(m.cTempViewAlias) USE IN &cTempViewAlias && close SQL view ACTIVATE SCREEN ENDIF WAIT CLEAR ENDFUNC
  5. これで、IBM Cloud Object Storage のテーブルをDBF ファイルとして保存できます。

以下は、FoxPro 9 構文の完全なコードです。

PARAMETERS cODBCDSN, cDatabaseName, lBrowseAfterConvert * cODBCDSN The ODBC data source name, used for the name of the folder where the DBF tables are stored. * cDatabaseName The name of the FoxPro database to use.This database is created if it does not exist.The default is DATABASE_NAME. * * lBrowseAfterConvert If ".t." display each table with the BROWSE command after importing it.If ".f." close each table before moving on to the next one. #define ODBC_DATASOURCE "DataSourceName" #define DATABASE_NAME "odbcdata" m.m_tpath = ".\" && root directory for data ON ERROR SET SAFETY OFF IF VARTYPE(m.cODBCDSN)#"C" .or.EMPTY(m.cODBCDSN) m.cODBCDSN = ODBC_DATASOURCE ENDIF IF VARTYPE(m.cDatabaseName)#"C" .or.EMPTY(m.cDatabaseName) m.cDatabaseName = DATABASE_NAME ENDIF m.cImportData = m.cODBCDSN + "\" CLOSE TABLES ALL CLOSE DATABASES ALL IF !DIRECTORY(m.cImportData) MKDIR (m.cImportData) ENDIF CREATE DATABASE (m.cDatabaseName) CREATE CONNECTION (m.cDatabaseName) DATASOURCE (m.cODBCDSN) DATABASE (m.cDatabaseName) WAIT WINDOW "Opening ODBC Connection for data source '" + m.cODBCDSN + "'..."NOWAIT NOCLEAR m.hSQLconnection = SQLCONNECT(m.cODBCDSN) IF m.hSQLconnection > 0 * Connection successful; get list of tables WAIT WINDOW "Fetching tables for data source '" + m.cODBCDSN + "'..."NOWAIT NOCLEAR m.nSQLTABLES = SQLTABLES(m.hSQLconnection) IF m.nSQLTABLES > 0 * Create local table containing list of tables in db COPY TO (m.cImportData + "sys_tables") USE * Convert each table to DBF USE (m.cImportData + "sys_tables") ALTER TABLE DBF("sys_tables") ; ADD COLUMN records i ; ADD COLUMN dbfname m SCAN m.cCurrentTable = TRIM(sys_tables.table_name) m.cCurrentTableType = TRIM(sys_tables.table_type) && Valid values are "SYSTEMTABLE", "TABLE", and "VIEW". IF m.cCurrentTableType = "TABLE" or m.cCurrentTableType = "VIEW" ODBCtoDBF(m.cCurrentTable, m.cCurrentTableType, m.lBrowseAfterConvert, m.hSQLConnection) ELSE ACTIVATE SCREEN ?"ERROR:", m.cCurrentTable, "Couldn't open ODBC connection." =MESSAGEBOX("couldn't open data source " + m.cODBCDSN + " for table " + m.cCurrentTable + ".") ENDIF ENDSCAN BROWSE NORMAL NOWAIT ELSE =MESSAGEBOX("No tables found in data source " + m.cODBCDSN + ".") SET STEP ON ENDIF SQLDISCONNECT(m.hSQLconnection) ELSE =MESSAGEBOX("Could not open data source " + m.cODBCDSN + ".") SET STEP ON ENDIF FUNCTION ODBCtoDBF (cTableName as String, cTableType as String, lBrowse as Logical, lhSQLConnection as Integer) WAIT WINDOW ; "Converting " + m.cTableType + ' "' + m.cTableName + '" to DBF...' ; NOWAIT NOCLEAR ACTIVATE SCREEN * Strip characters incompatible with FoxPro out of the name of the DBF file m.cTableAlias = "" m.nTableNameLen = LEN(m.cTableName) m.nTableNameStart = 1 FOR m.nTableNameStart = 1 TO m.nTableNameLen m.cCharacter = SUBSTR(m.cTableName, m.nTableNameStart, 1) IF !ISALPHA(m.cCharacter) .and. (m.nTableNameStart = 1 .or. !ISDIGIT(m.cCharacter)) m.cTableAlias = m.cTableAlias + "_" ELSE m.cTableAlias = m.cTableAlias + m.cCharacter ENDIF ENDFOR m.cFromTable = m.cTableName m.cTempViewAlias = m.cTableType + "_" + m.cTableAlias LOCAL loException as Exception LOCAL lnResultSets TRY * Run query m.lnResultSets = SQLEXEC(m.lhSQLConnection, ; "SELECT * FROM " + m.cFromTable, ; m.cTempViewAlias, ; aSQLResult) IF m.lnResultSets#1 SET STEP ON ENDIF ACTIVATE SCREEN CATCH TO m.loException ACTIVATE SCREEN ?"Error opening " + m.cTempViewAlias + ":" ? m.loException.Message ? m.loException.Details ENDTRY IF !USED(m.cTempViewAlias) RETURN ENDIF * Copy records from view cursor to disk SELECT * FROM (m.cTempViewAlias) ; INTO TABLE (m.cImportData + m.cTableAlias) IF USED(m.cTableAlias) ACTIVATE SCREEN FLUSH && Flush the buffer to write the data to disk IF m.lBrowse * Display the table on screen SELECT (m.cTableAlias) BROWSE NORMAL NOMODIFY NOWAIT ACTIVATE SCREEN ELSE * Close on-disk table USE IN (m.cTableAlias) ACTIVATE SCREEN ENDIF ENDIF IF USED(m.cTempViewAlias) USE IN &cTempViewAlias && Close SQL view ACTIVATE SCREEN ENDIF WAIT CLEAR ENDFUNC