how to connect barcode scanner in c# T h e Wo r l d o f R e l a t i o n a l D a t a b a s e s in Microsoft Office

Create QR Code 2d barcode in Microsoft Office T h e Wo r l d o f R e l a t i o n a l D a t a b a s e s

T h e Wo r l d o f R e l a t i o n a l D a t a b a s e s
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PART I PART I PART I
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FIGURE 2-2
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Three types of database relationships
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Part I:
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Getting Started
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Referential Integrity
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Referential integrity is an optional system of rules that guarantees the relationships are valid and the database will remain intact as data is entered, edited, or deleted The basic rule of referential integrity is this: For every record in a child table (the many side), one and only one matching record must be in the parent table (the one side) For example, in the relationship between the Customers table (parent) and the Workorders table (child), every current work order must have a reference to a customer You cannot have a work order without a customer The referential integrity rules also prevent you from deleting a customer record if work orders are still in progress Here s a summary of the referential integrity rules that Access can enforce: You cannot enter a child record for which no parent exists (start a work order without a customer) You cannot delete a parent record if related child records still exist (remove a customer before the job is completed) You cannot change a child record so its foreign key doesn t have a match in the parent table (change the customer field in a work order record to a nonexistent customer) You cannot change the primary key value in a parent table as long as related records are in the child table (change a customer link before the work order is finished) These rules help to maintain an accurate and complete database with no loose ends Before you can set referential integrity, you must make sure you meet the following conditions: The matching field in the parent table is the primary key or at least has a unique value, such as an AutoNumber field Related fields are the same data type Both tables are in the same Access database You can set referential integrity between linked tables, provided they are both in Access format and you open the database that contains the linked tables The same rules can apply to a one-to-one relationship Enforcing the referential integrity rules in such a relationship guarantees that every record in one table has one and only one matching record in the other table
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Defining Database Objects
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Before going any further, let s take a closer look at the objects that make up a database Access is an object-oriented database management system (DBMS), which means that the entire database is composed of objects with certain characteristics or attributes called properties that determine their structure, appearance, and behavior For example, table properties include a description of the table, the subject of the table, and the arrangement of records in the table, such as in alphabetic or chronological order, based on one or more fields In turn, each of the major Access objects is a container for other objects, which also have properties For example, tables are made up of fields that are considered objects with properties of their own, such as name, size, format, and data type Reports and forms contain
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2:
T h e Wo r l d o f R e l a t i o n a l D a t a b a s e s
design objects, such as data fields, titles and labels, command buttons, page numbers, and graphics Each of these has a list of properties you can set to achieve the effect you want As you see in the Navigation Pane, the major database objects are tables, queries, forms, reports, macros, and modules The tables are the containers for all the data in your database As mentioned earlier, in a relational database system, the data is distributed among several related tables instead of being placed in one large table A query is a question that you ask of your database You usually use a query to extract a specified set of records from one or more tables For example, you might ask the database to show you a list of delicatessen customers who are vegetarians or who have a preference for exotic pasta products Access answers your question by displaying the requested data Because a query is a stored question instead of a stored answer, when you ask the question again, the results include the latest information You can not only view the results, you can also use them in reports and forms Forms are often more convenient than a tabular datasheet for entering and editing table data, especially if a table includes more data than can fit across the screen and you have to scroll right to see the rest A form can display a single record at a time, so all the data is visible at once, and you can arrange the fields in any way you want in a form design You can also include data from more than one table or query as the basis for a single form Forms are especially useful for creating a comfortable visual environment for data management For example, you can create a form that resembles the paper form used to collect data in the work place When you want to print the data, you usually create a report The report can be a quick and easy dump of the table data useful for checking specific data items or it can be a glossy presentation of the data in a custom format suitable for the stockholders or a business manager The report can also include totals and other summaries of values in a particular field, such as gross sales and monthly profits Adding charts and graphs to a report makes it even more visually informative Access provides a special type of report through the Label Wizard that you can use for printing mailing labels or envelopes If you keep a mailing list in a database table, this type of special report can come in handy You can also create form letters and merge them with the address list to print a personalized copy for each recipient The final two types of objects are macros and modules Macros contain a sequence of commands that perform a certain task and are useful for defining the automatic actions that respond to button clicks or other events Several new features have been added to macros in Office Access 2007 that make them more useful and secure (See 19 for details) Modules are programs written in Visual Basic for Applications (VBA), the programming language used by Office Access 2007 Procedures contained in the modules are the cornerstone of advanced Access applications
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