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ects.
Data Control: A control placed on a form and bound to a data source. It provides buttons that enable you to move through the data.
Database Management System (DBMS): A software interface that handles user requests for database actions, and controls security, integrity, interactive querying, interactive data entry and updating, and independence of data in a database. It accepts requests from the application and instructs the operating system to transfer the appropriate data.
Data Environment Designer: Provides a graphical approach for generationg codeless ActiveX Data Objects Connections, Commands, and Recordsets from row-returning queries. Connects to Jet databases through a native OLE DB data provider and to other ODBC-enabled desktop and client/server data sources with the Microsoft OLE DB Provider for ODBC.
Date Function: Returns the current date from the system clock.
DateAdd Function: Returns a Variant containing a date to which a specified time interval has been added. Used to add or subtract a time interval from an existing date.
DateDiff Function: Returns a Variant containing the number of time intervals between two specified dates.
DatePart Function: Returns a specified part of a given date.
DateSerial Function: Returns the date for a specific year, month, and day.
DateValue Function: Returns the date represented by a String argument.
Day Function: Returns a whole number representing the day of the month for a specified date.
DblClick Event: Occurs when the user double-clicks a mouse button over an object.
DDB Function: Returns the depreciation of an asset for a specific period using the double-declining balance method.
Deactivate Event: Occurs when a form is no longer the active window.
Debug: To detect, locate, and correct logical or syntactical errors in a program''''s code.
Default Property: When an object is accessed, this property is used automatically if no property is specified. VB objects usually have a default property. For example, if you access a textbox without specifying a property, it will use the Text property. For instance, x = txtName is the same as x = txtName.Text.
Deferred Integrity: A conceptual protocol that assumes the success of a piece of work but checks its success later. Writing a check at a store and receiving your merchandise, while the actual transfer of money occurs later, is an example of deferred integrity.
Design Time: Term describing changes you make to your program through the VB IDE when the program is not running. The opposite of run time. See also: Run Time.
Dir Function: Returns the name of a file or directory that matches a specified pattern and file attribute. Can also return the volume label of a drive.
Distributed Component Object Model (DCOM): Microsoft''''s counterpart to CORBA, DCOM facilitates remote object distribution over networks and the Internet. This distributed object technology provides additions to COM. See also: Component Object Model, Common Object Request Broker Architecture.
Distributed Processing: Spreads the functionality of a program across different machines. For example, UI code is on the client machine, data access components reside in an MTS server, and the database is on another machine.
Dockable: A window is docked when it''''s anchored to the edge of the host window instead of being able to move around freely.
DoEvents Function: Causes Visual Basic to yield execution so Windows can process events.
DragDrop Event: Occurs when a drag-and-drop operation is completed as a result of dragging a control over a form or control and releasing the mouse button.
DragOver Event: Occurs when a drag-and-drop operation is in progress.
DropDown Event: Occurs when the list portion of a combo box is about to drop down.
Dynamic Data Exchange (DDE): A mechanism supported by Windows that enables two applications to exchange data continuously and automatically.
Dynamic HTML (DHTML): HTML tag enhancements enabling Web pages to function more like software. Enables you to change HTML tags dynamically using a scripting language.
Dynamic Link Library (DLL): Enables you to bind code to one of many executables at run time rather than at link time, creating an environment in which many applications can use the same code base.
Early Binding: Assigning types to variables and expressions at compilation time. Early binding is usually more efficient than late binding because it reduces the time required to set or retrieve a property value. See also: Late Binding.
Encapsulation: The grouping of subroutines and variables together in a class.
Enterprise Edition: Version of VB for development teams creating robust client/server or Internet/intranet apps. Includes all features of the Professional Edition, plus Microsoft SQL Server Developer Edition, Visual Modeler, Microsoft Visual SourceSafe, and Windows NT Option Pack.
Environ Function: Returns the string associated with an operating system environment variable such as the PATH statement.
EOF Function: Returns a value indicating whether the end of a file has been reached.
EOF Property: Returns a value indicating whether the current record position is after the last record in a recordset. See also: BOF Property.
Err Object: An intrinsic VB object that contains information about runtime errors. This information can be accessed by its properties such as Number, Description, and Source.
Error Event: Occurs only as the result of a data access error that occurs when no VB code is being executed. This event is associated with controls that access data, such as the ADO Data control or the DataGrid control. This event fires when a non-VB error is generated such as an ADO error or perhaps a memory error.
Error Function: Returns the error message that corresponds to a given error code.
Event Handler: Subroutine called directly from VB in response to events associated with a particular object.
Event Procedure: Contains code that is executed when an event occurs, such as when the user presses a mouse button.
Event: Occurs as the result of an action performed by the user or the program. For example, when the user presses the left mouse button over a button control, the MouseDown event is activated and the code in that event procedure runs. When an object''''s event occurs, VB calls the associated event handler.
Event-Driven: An application driven by input from the user or other application. VB is an event-driven language. See also: Procedural.
Exp Function: Returns the constant e raised to the power n.
Fat Client: In a client/server environment, a client machine that contains the program logic and performs most or all of the application processing while the server performs little or none. See also: Fat Server, Thin Client.
Fat Server: In a client/server environment, a server that contains the program logic and performs most or all application processing with the client performing little or none. A thin client is the fat server''''s counterpart. See also: Fat Client, Thin Client.
Field: One of several pieces of data that make up a record.
FileAttr Function: Returns file mode or operating system file-handle information about an open file.
FileDateTime Function: Returns a string indicating the date and time a specified file was created or last modified. For example, you can use this function to determine whether a file was opened to input data or append data.
FileLen Function: Returns a Long integer that indicates the length of a file in bytes.
First In, First Out (FIFO): A queue in which elements must be removed in the same order as they were inserted.
Floating Point: Mathematical operation based on a number expressed as a whole or a fraction, such as 1.5 or 3.421.
Focus: The active object. For example, typed keys are directed to the window that has focus.
Form Module: Contains the code associated with a form object. It can also contain form-level declarations of constants, variables, and external procedures.
Format Function: Formats a number, date, time, or string according to instructions contained in a format expression. For example, Format(MyTime, "hh:mm:ss AMPM") returns "05:04:23 PM".
FreeFile Function: Returns the next valid unused file number.
Front End: The part of an application users see and interact with. It can contain user interface elements as well as code.
Function: A subroutine that returns a value. It can also take arguments.
FV Function: Returns the future value of an annuity based on periodic, constant payments, and a constant interest rate.
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GetAttr Function: Returns an integer that indicates the attributes of a file, directory, or volume label. Can also return attributes such as whether the file is read-only or hidden.
GetObject Function: Retrieves an OLE Automation (ActiveX) object from a file.
GotFocus Event: Occurs when an object receives focus, either by user action such as tabbing to or clicking on the object, or by using the SetFocus method to change focus in code.
Graphical User Interface (GUI): An object-based screen display that enables the user to manipulate a mouse to point and click on graphical representations of programs and files. Windows has a GUI; DOS has a command-line interface.
Handler: A routine to manage a common condition or operation, such as error r 上一页 [1] [2] [3] [4] [5] 下一页
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