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DataBind Controls to Sybase データ in C++Builder
DataBind to Sybase のデータ in C++Builder with standard components and controls.
最終更新日：2023-06-12The CData ODBC Driver for Sybase makes it easy to integrate connectivity to live Sybase のデータ with standard data access components in C++Builder. This article shows how to create a simple visual component library (VCL) application in C++Builder that connects to Sybase のデータ, executes queries, and displays the results in a grid. An additional section shows how to use FireDAC components to execute commands from code.
Create a Connection to Sybase データ
If you have not already, first specify connection properties in an ODBC DSN (data source name). This is the last step of the driver installation. You can use the Microsoft ODBC Data Source Administrator to create and configure ODBC DSNs.
Sybase は、Basic 認証、Kerberos 認証、LDAP 認証などの認証方法をいくつかサポートしています。
Basic 認証を使用した接続
次を設定してデータを認証し接続します。User およびPassword を設定してSybaseIQ 認証を使用します。
- User：認証Sybase ユーザーのユーザー名に設定。
- Password：認証Sybase ユーザーのパスワードに設定。
- Server：SybaseIQ またはSAP SQL Anywhere データベースインスタンスの名前またはネットワークアドレスに設定。
- Database：指定されたサーバーで実行されているSybaseIQ またはSAP SQL Anywhere データベースの名前に設定。
オプションで、UseSSL をtrue に設定することにより、TLS/SSL で接続を保護できます。
Note： 上記のCData 製品 設定でSAP SQL Anywhere のインスタンスに接続することもできます。
Kerberos 認証を使用した接続
Kerberos 認証を活用するには、次の接続プロパティを使用してそれを有効にすることから始めます。
- AuthScheme：Kerberos に設定すると、Sybase への認証に使用されます。
Kerberos 認証用に設定する必要がある接続プロパティに関しては、Kerberos の使用 情報を参照してください。
以下は接続文字列の例です。
Server=MyServer;Port=MyPort;User=SampleUser;Password=SamplePassword;Database=MyDB;Kerberos=true;KerberosKDC=MyKDC;KerberosRealm=MYREALM.COM;KerberosSPN=server-name
LDAP 認証を使用した接続
LDAP 認証で接続するには、LDAP 認証メカニズムを使用するようにSybase サーバーサイドを設定する必要があります。
LDAP 用にSybase を設定したら、Basic 認証と同じクレデンシャルを使用して接続できます。
You can then follow the steps below to use the Data Explorer to create a FireDAC connection to Sybase.
- In a new VCL Forms application, expand the FireDAC node in the Data Explorer.
- Right-click the ODBC Data Source node in the Data Explorer.
- Click Add New Connection.
- Enter a name for the connection.
- In the FireDAC Connection Editor that appears, set the DataSource property to the name of the ODBC DSN for Sybase.
Create VCL Applications with Connectivity to Sybase データ
Follow the procedure below to start querying Sybase のデータ from a simple VCL application that displays the results of a query in a grid.
-
Drop a TFDConnection component onto the form and set the following properties:
- ConnectionDefName: Select the FireDAC connection to Sybase.
- Connected: Select True from the menu and, in the dialog that appears, enter your credentials.
-
Drop a TFDQuery component onto the form and set the properties below:
- Connection: Set this property to the TFDConnection component, if this component is not already specified.
SQL: Click the button in the SQL property and enter a query. For example:
SELECT Id, ProductName FROM Products WHERE ProductName = Konbu- Active: Set this property to true.
Drop a TDataSource component onto the form and set the following property:
- DataSet: In the menu for this property, select the name of the TFDQuery component.
-
Drop a TDBGrid control onto the form and set the following property:
- DataSource: Select the name of the TDataSource.
- Drop a TFDGUIxWaitCursor onto the form — this is required to avoid a run-time error.
Execute Commands to Sybase with FireDAC Components
You can use the TFDConnection and TFQuery components to execute queries to Sybase のデータ. This section provides sybasespecific examples of executing queries with the TFQuery component.
Connect to Sybase データ
To connect to the data source, set the Connected property of the TFDConnection component to true. You can set the same properties from code:
FDConnection1->ConnectionDefName = "CData Sybase ODBC Source";
FDConnection1->Connected = true;
To connect the TFDQuery component to Sybase のデータ, set the Connection property of the component. When a TFDQuery component is added at design time, its Connection property is automatically set to point to a TFDConnection on the form, as in the application above.
Create Parameterized Queries
To create a parameterized query, use the following syntax below:
FDQuery1->SQL->Text = "select * from Products where productname = :ProductName";
FDQuery1->ParamByName("productname")->AsString = "Konbu";
query->Open();
The example above binds a string-type input parameter by name and then opens the dataset that results.
Prepare the Statement
Preparing statements is costly in system resources and time. The connection must be active and open while a statement is prepared. By default, FireDAC prepares the query to avoid recompiling the same query over and over. To disable statement preparation, set ResourceOptions.DirectExecute to True; for example, when you need to execute a query only once.
Execute a Query
To execute a query that returns a result set, such as a select query, use the Open method. The Open method executes the query, returns the result set, and opens it. The Open method will return an error if the query does not produce a result set.
FDQuery1->SQL->Text := "select * from Products where productname = :ProductName";
FDQuery1.ParamByName("productname")->AsString = "Konbu";
FDQuery1->Open();
To execute a query that does not return a result set, use the ExecSQL method. The ExecSQL method will return an error if the query returns a result set. To retrieve the count of affected rows use the TFD.RowsAffected property.
FDQ.SQL.Text := "delete from Products where Id = :Id";
FDQuery1->Params->Items[0]->AsString = "x12345";
FDQuery1->ExecSQL();
AnsiString i = FDQuery1->RowsAffected;
Related Articles
Below you can find other articles for using the CData ODBC Driver with RAD Studio, Delphi, and C++ Builder.
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