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DataBind Controls to LDAP Objects in C++Builder
DataBind to LDAP のデータ in C++Builder with standard components and controls.
最終更新日：2023-06-12The CData ODBC Driver for LDAP makes it easy to integrate connectivity to live LDAP 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 LDAP 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 LDAP Objects
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.
リクエストを認証するには、User およびPassword プロパティを有効なLDAP クレデンシャル（例えば、User を"Domain\BobF" または"cn=Bob F,ou=Employees,dc=Domain"）に設定します。 CData 製品は、デフォルトでプレーンテキスト認証を使用します。これは、CData 製品がサーバーとTLS/SSL のネゴシエーションを試みるためです。 AuthMechanism を使って別の認証方法を指定できます。 TLS/SSL コンフィギュレーションについて詳しくは、ヘルプドキュメントの「高度な設定」を参照してください。
- 基本接続には、Server およびPort を設定します。さらに、次のように接続を微調整できます。
- FollowReferrals：設定すると、CData 製品は参照サーバーのデータもビューとして表示します。参照サーバー上のデータを変更するには、このサーバーをServer およびPort で指定する必要があります。
- LDAPVersion：サーバーが実装するプロトコルのバージョンに設定します。デフォルトでは、CData 製品はversion 2 を使用します。
- BaseDN は、LDAP 検索の範囲を指定された識別名の高さに限定します。BaseDN の範囲を絞ることはパフォーマンスを劇的に向上させます。例えば、"cn=users,dc=domain" の値は、"cn=users" およびその子に含まれる結果のみを返します。
- Scope：このプロパティを使用すると、サブツリーから返されるデータをより細かく制御できます。
You can then follow the steps below to use the Data Explorer to create a FireDAC connection to LDAP.
- 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 LDAP.
Create VCL Applications with Connectivity to LDAP Objects
Follow the procedure below to start querying LDAP 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 LDAP.
- 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, LogonCount FROM User- 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 LDAP with FireDAC Components
You can use the TFDConnection and TFQuery components to execute queries to LDAP のデータ. This section provides ldapspecific examples of executing queries with the TFQuery component.
Connect to LDAP Objects
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 LDAP ODBC Source";
FDConnection1->Connected = true;
To connect the TFDQuery component to LDAP 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 User where cn = :CN";
FDQuery1->ParamByName("cn")->AsString = "Administrator";
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 User where cn = :CN";
FDQuery1.ParamByName("cn")->AsString = "Administrator";
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 User 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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