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You can use other settings and methods to connect to Oracle using ODP.NET. Most of these connection methods and settings are specified through the connection string. Let s take a look at the other different ways to connect to Oracle in the following subsections.

virtual int index_init(uint idx) { active_index=idx; return 0; } virtual int index_end() { active_index=MAX_KEY; return 0; } // omitted ... virtual int rnd_init(bool scan) =0; virtual int rnd_end() { return 0; } public: handler (TABLE *table_arg) {} virtual ~handler(void) {} // omitted ... void update_auto_increment(); // omitted ... virtual bool has_transactions(){ return 0;} // omitted ... // omitted ... virtual int open(const char *name, int mode, uint test_if_locked)=0; virtual int close(void)=0; virtual int write_row(byte * buf) { return HA_ERR_WRONG_COMMAND; } virtual int update_row(const byte * old_data, byte * new_data) {} virtual int delete_row(const byte * buf) {} virtual int index_read(byte * buf, const byte * key, uint key_len, enum ha_rkey_function find_flag) {} virtual int index_read_idx(byte * buf, uint index, const byte * key, uint key_len, enum ha_rkey_function find_flag); virtual int index_next(byte * buf) {} virtual int index_prev(byte * buf) {} virtual int index_first(byte * buf) {} virtual int index_last(byte * buf) {} // omitted ... virtual int rnd_next(byte *buf)=0; virtual int rnd_pos(byte * buf, byte *pos)=0; virtual int read_first_row(byte *buf, uint primary_key); // omitted ... virtual void position(const byte *record)=0; virtual void info(uint)=0; // omitted ... virtual int start_stmt(THD *thd) {return 0;} // omitted ... virtual ulonglong get_auto_increment(); virtual void restore_auto_increment(); virtual void update_create_info(HA_CREATE_INFO *create_info) {}

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So far, you ve seen how a control designer can change the way a control works. But another reason to use designers is to add frills, like fancy wizards that make it easier to set complex properties. For example, you can use a custom designer to add to the context menu that is displayed when a programmer right-clicks your control in the design environment. This menu always contains some standard options provided by Visual Studio, but it can also contain your commands (technically known as verbs). To add verbs, you need to override the Verbs property in your custom designer, create a new DesignerVerbCollection, and add the appropriate DesignerVerb object entries. Your control designer handles the verb click event, generally by updating the associated control.

The following example retrieves a list of all the drives on the current computer, and adds a context menu entry for each one. The user can click the appropriate entry to set the Drive property of the control. public class DirectoryTreeDesigner : ControlDesigner { private DesignerVerbCollection verbs = new DesignerVerbCollection(); public DirectoryTreeDesigner() { // Configure the designer verb collection. string[] drives = System.IO.Directory.GetLogicalDrives(); foreach (string drive in drives) { verbs.Add(new DesignerVerb("Set Drive " + drive, new EventHandler(OnVerb))); } } public override DesignerVerbCollection Verbs { get { return verbs; } } protected void OnVerb(object sender, EventArgs e) { // Retrieve the selected drive. char driveLetter = ((DesignerVerb)sender).Text[10]; // Adjust the associated control. ((DirectoryTree)this.Control).Drive = driveLetter; } }

/* admin commands - called from mysql_admin_table */ virtual int check(THD* thd, HA_CHECK_OPT* check_opt) {} virtual int backup(THD* thd, HA_CHECK_OPT* check_opt) {} virtual int restore(THD* thd, HA_CHECK_OPT* check_opt) {} virtual int repair(THD* thd, HA_CHECK_OPT* check_opt) {} virtual int optimize(THD* thd, HA_CHECK_OPT* check_opt) {} virtual int analyze(THD* thd, HA_CHECK_OPT* check_opt) {} virtual int assign_to_keycache(THD* thd, HA_CHECK_OPT* check_opt) {} virtual int preload_keys(THD* thd, HA_CHECK_OPT* check_opt) {} /* end of the list of admin commands */ // omitted .. virtual int add_index(TABLE *table_arg, KEY *key_info, uint num_of_keys) {} virtual int drop_index(TABLE *table_arg, uint *key_num, uint num_of_keys) {} // omitted .. virtual int rename_table(const char *from, const char *to); virtual int delete_table(const char *name); virtual int create(const char *name, TABLE *form, HA_CREATE_INFO *info)=0; // omitted .. }; You should recognize most of the member methods They correspond to features you may associate with your experience using MySQL.

You can choose to connect to the Oracle database without referring to a net service name in the TNSNames.ora file. In such a case, you can define an entire descriptor in the connection string (in the

Note This example shows the na ve approach that modifies the control directly. The problem is that this doesn t inform Visual Studio that a change has taken place, and the user interface won t be refreshed properly. To deal with this issue, you need to take additional steps to notify Visual Studio, as described at the end of this section.

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