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ing interface developed by Microsoft that provides a common interface to databases. VB communicates through an ODBC driver to the database.
Operator: A symbol used to perform an operation or comparison on a value. Arithmetic operators: +, -, *, / and ^. Logical operators: And, Or, and Not.
Paint Event: Occurs when a form or picture box is notified to repaint its display.
Parameter: A value passed for processing to a subroutine or function. For example, in the function call Str(459), the number 459 is a parameter passed into the Str() function.
Partition Function: Returns a string indicating where a number occurs within a calculated series of ranges.
PathChange Event: Occurs in a FileListBox control when the path changes by setting the FileName or Path properties.
PatternChange Event: Occurs in a FileListBox control when the file-listing pattern changes by setting the FileName or Pattern properties.
Persistent Data: Data that the computer retains from session to session, stored in a database, on disk, or on tape.
Persistent Object: An object that exists after the program that created it has been unloaded. The object is stored for later use.
Pmt Function: Returns the payment for an annuity based on periodic, constant payments, and a constant interest rate.
PPmt Function: Returns the principal payment for a given period of an annuity based on periodic, constant payments, and a constant interest rate.
Procedure: See Subroutine.
Procedural: An application run sequentially in which the user must follow a predefined path. Many DOS programming languages are procedural. See also: Event-Driven.
Professional Edition: VB for Windows application development, meant for individual developers'''' use. It enables programmers to create applications for Microsoft Windows 95, 98, and NT. Among other features, it includes a native-code compiler, ADO, integrated professional visual database tools, automatic data binding, the Data Environment Designer, and the WebClass Designer.
Program Statement: A phrase in a high-level programming language, such as VB, that translates into one or more machine-level instructions after program compilation.
Project: Contains the files associated with a program you develop using VB. The project file usually ends in VBP and can be viewed in the Project Explorer.
Property: A named attribute of an object that defines the object''''s characteristics such as size, name, or state. You can change an object''''s properties either in Visual Basic''''s Properties window at design time, or by accessing an object''''s property from VB code at run time.
PV Function: Returns the present value of an annuity based on periodic, constant payments to be paid in the future, and a constant interest rate.
QBColor Function: Returns the RGB color code corresponding to a color number.
Query: A statement that interrogates a database and extracts data for later use.
QueryUnload Event: Occurs before a form or application closes. When an app is closing, the QueryUnload event occurs first in an MDI form and then in all other forms.
Queue: A temporary holding place for data.
Rapid Application Development (RAD): Developing and implementing computer systems in segments, instead of waiting until the entire project is programmed before implementing it. Developed by James Martin, RAD uses tools such as visual programming and GUI builders to speed prototype development.
Rate Function: Returns the interest rate per period for an annuity.
Record: A collection of one or more fields containing related information.
Recordset: A set of records in memory returned from a stored procedure, table, or query, selected from a data source.
Registry: A Windows 95, 98, and NT database that stores information about the hardware and environment configuration of the PC it has been installed in. Replaces INI files and MS-DOS configuration files from Windows 3.x.
Relational Database: A database or database management system (DBMS) that organizes data and relations between the data in tables made up of columns and rows of data (Visual Basic refers to columns as fields, and rows as records). Relational databases enable the definition of data structures, storage and retrieval operations, and integrity constraints. Certain fields may be designated as keys, which means that searches for specific values of that field will use indexing to speed them up. Records in different tables may be linked if they have the same value in one particular field in each table.
Relational Database Management System (RDBMS): See Relational Database.
Remote Data Objects (RDO): Microsoft''''s programming interface for data access from Microsoft, used in Visual Basic to access remote ODBC databases. RDO was a precursor to ADO. See also: ActiveX Data Objects, Data Access Objects, Open Database Connectivity.
Remote Data Services (RDS): Microsoft''''s programming interface for data access to Internet or intranet data from ActiveX-enabled browsers.
Reposition Event: Occurs after a record becomes the current record.
Resize Event: Occurs when a form first appears or the size of an object changes.
Resource File: Contains bitmaps, text strings, or other data you can change without editing code.
RGB Function: Returns a long integer representing an RGB color value.
Right Function: Returns the right-most n characters of a string argument.
Rnd Function: Generates a random number between zero and 1. This function can be used to find a random number within a range of numbers; for example, Int((6*Rnd)+1) returns a number between 1 and 6.
Row Locking: A method to ensure the same record in an RDBMS is not being accessed simultaneously.
RowColChange Event: Occurs in a grid control when the currently active cell status transfers to a different cell.
Run Time: Describes the condition of operations executing while a program is running. Opposite of design time. See also: Design Time.
STUV
Scalability: An application''''s ability to expand or handle additional users.
Scroll Event: Occurs while a user drags the box on a scrollbar.
Second Function: Returns a number between zero and 59 that contains the second portion of the specified time.
Seek Function: Returns the current position in an open file.
SelChange Event: Occurs in a grid or rich textbox control when the selected range changes to a different cell or range of cells.
Server: A computer in a network shared by multiple users and provides requested information and services (such as Web pages, files, and print services) to a client. See also: Client, Client/Server, Fat Server.
Sgn Function: Returns an integer indicating the sign of a number; -1 if n is less than zero, 0 if n is zero, and +1 if n is greater than zero.
Shell Function: Runs an executable program from within a VB application. For example, Shell("C:\WINDOWS\CALC.EXE", 1) launches the Windows calculator.
Sin Function: Returns the sine of the angle n. The angle n is expressed in radians.
Single Tier: A driver designed for use with DBMSs. The SQL statement issued to the ODBC driver is converted to low-level instructions that operate directly on the database files.
SLN Function: Returns the straight-line depreciation of an asset for a single period.
Source Code: The uncompiled VB statements that make up a program.
Space Function: Returns a string consisting of a specified number of spaces.
Spc Function: Skips a specified number of spaces in a Print # statement or Print method.
Sqr Function: Returns the square root of n.
Standard Module: Can contain public or module-level declarations of types, constants, variables, external procedures, and public procedures.
Statement: A descriptive phrase that generates machine language instructions in the computer.
Stored Procedure: One or more SQL statements stored and run as a single unit in a database.
Str Function: Converts a numeric value to a string.
StrComp Function: Returns a Variant that indicates the result of the comparison of two string arguments.
String Function: Returns a string whose characters have a given ANSI code or are all the first character of a string expression. The statement String(5, "*") returns "*****".
String: A data structure composed of a sequence of characters.
Structured Query Language (SQL): A database sublanguage used in querying, updating, and managing relational databases. An accepted standard of database technology, SQL can be embedded in applications.
Subroutine: A unit of source code that a program can call from other parts of the source code. After a subroutine executes to completion, Visual Basic passes control back to the code that called the subroutine. Synonymous with procedure.
Switch Function: Evaluates a list of expressions and returns a value or an expression associated with the first expression in the list that is true.
SYD Function: Returns the sum-of-years'''' digits depreciation of an asset for a specified period of time.
Synchronous: Events that are coordinated in time. Completing the current operation before the next one is started is a synchronous operation. A program that makes a synchronous query sends the query to the database and waits for it to return before continuing processing. See also: Asynchronous.
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