Online Data Entry Jobs

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Overview of the Database Forms Expert

The Database Forms Expert automates many of the tasks necessary for creating data-entry or tabular forms from an existing database table. It can generate simple or master detail forms using TTable or TQuery components. The Database Forms Expert automates such form building tasks as

Lookup DB Course Chapter

In our sample aboutdelphi.mdb database, Applications table lists Delphi applications uploaded by the visitors to this site. Among other fields, the Author and Type fields are linked with the corresponding fields in the Authors and Types tables. Only values from the AuthorName field in the Authors table can appear in the Author field of the Applications table. The same rule is applied to the TypeName field (Types table) and the Type field (Applications table). Another situation consider an application data entry form whose fields are connected to the Applications table. Let's say that this table has only one information related to the author of the application, an AuthorNo field corresponding to authors unique number. The Authors table, on the other hand, contains an AuthorNo field corresponding to authors UN, and also contains additional information, such as the authors name, email and a web page. It would be convenient if the data entry form enabled a user...

Specifying constraints

In addition to these server-enforced constraints, you can create and use custom constraints that are applied locally to the fields in client datasets. Custom constraints can duplicate the server constraints (so that you detect errors immediately when posting edits to the change log rather than later when you attempt to apply updates), or they can impose additional, application-defined limits. Custom constraints provide validation of data entry, but they cannot be applied against data received from or sent to a server application.

Creating a custom constraint

A custom constraint is not imported from the server like other constraints. It is a constraint that you declare, implement, and enforce in your local application. As such, custom constraints can be useful for offering a prevalidation enforcement of data entry, but a custom constraint cannot be applied against data received from or sent to a server application.

Writing a procedure or function

So far, the application doesn't allow users to make any data entry errors. For example, if a user neglects to enter a value in one of the two edit boxes before clicking a button, the application stops running. To ensure that this doesn't happen, you'll write some code to check for a value in the edit boxes and, if there is none, prompt the user to enter one. Instead of writing this code twice once in each event handler you could write it once and call the routine from the event handler.

Using an XML File to Host Credentials

This technique has the same drawbacks as storing the username password combinations in the web.config file. It requires that an administrator manages entering users and passwords into this text file. This becomes especially problematic if the passwords stored are in some sort of encrypted format such as MD5. Certainly, one could develop a tool that would make this data entry easier and generate the encrypted form of the password.

Master detail relationships DB

When working with the BDE and Delphi, the simplest way to assemble a master-detail form is to use the Database Form Wizard. Wizard simplifies the steps needed to create a tabular or data-entry form by use of an existing database, unfortunately it is designed to use the BDE versions of TTable and TQuery components. Everything the wizard does, we can do by hand.

Setting display and edit properties at design time

Specifies the format of data displayed in a data-aware component. Specifies the column name for a field in a data-aware grid component. Specifies the width, in characters, of a grid column that display this field. Specifies the edit format of data in a data-aware component. Limits data-entry in an editable field to specified types and ranges of characters, and specifies any special, non-editable characters that appear within the field (hyphens, parentheses, and so on).

Data Access with Delphijust a few words

Delphi ships with more than 40 prebuilt database components and provides a visual programming environment that includes an integrated code editor, Database Form wizard that speeds up steps to create a browsable data form and Data Module Designer that can be used to share data access among multiple forms. Several other database specialized tools are also provided with Delphi to help us code faster and easier.

Searching for data DB

Note the rest of this chapter deals with the aboutdelphi.mdb MS Access database that was introduced in the first chapter of this course. To use the code examples presented in this chapter, set up the data form with the core components (data-access and data-aware) as described in the previous chapters. The following code examples will assume that you are working with the ADOTable component pointing to the Applications table in our database.

Table lists the Modal Result constants that VCL defines Table Vcl Modal Result Constants

The default button is the button that has the BS_DEFPUSHBUTTON style set (usually the OK button). This feature has been the bane of programmers and the curse of data-entry personnel for years. The Default property is used to set a button as the default button for a form. The default value for this property is False. To make a button the default button, set its Default property to True. If you don't specifically set any button's Default property to True, the form will not close when the user presses the Enter key.

Sending Database Data over a Socket Connection

Using the techniques we've seen so far, we can write an application that moves database records over a socket. The idea will be to write a front end for data input and a back end for data storage. The client application will have a simple data-entry form and use a database table with string fields for Company, Address, State, Country, Email, and Contact, and a floating-point field for the company ID (called CompID).

Data modifications DB

To follow this article you'll need to create a data form similar to ones we were creating in the previous chapters. Use the standard set (DataSource, ADOTable and ADOConnection) of components to connect to our Access database. This time we will be exploring the Authors table. Recall that the Authors table has three fields (columns) AuthorName, Email and Web. All three are text fields, in the first chapter we added one dummy record.

Setting the focus in a dialog box

When you design a dialog box, you usually want to specify which component should have focus when the dialog box first opens. For example, in a data entry form you might want to give focus to the edit or memo component where users will first be entering data. That way the user can begin typing immediately, without first having to tab to a certain component. Focus changes automatically at run time when the user tabs among components. You often want to actively specify a focus change. Taking the previous example, if you are designing a data entry form, you might want to specify that focus change from field to field each time the user presses an arrow key. You specify that a component gets focus by using the SetFocus method.

Elements of the Delphi interface

You can think of a form as a component that can contain other components. Your application's main form and its components interact with other forms and their components to create your application interface. The main form is your application's main interface other forms can include dialog boxes, data entry screens, and so on.

Master detail relationships

When working with the BDE and Delphi, the simplest way to assemble a masterdetail form is to use the Database Form Wizard. Wizard simplifies the steps needed to create a tabular or data-entry form by use of an existing database, unfortunately it is designed to use the BDE versions of TTable and TQuery components. Everything the wizard does, we can do by hand.

Handling events

OnGetText and OnSetText events are primarily useful to programmers who want to do custom formatting that goes beyond the built-in formatting functions. OnChange is useful for performing application-specific tasks associated with data change, such as enabling or disabling menus or visual controls. OnValidate is useful when you want to control data-entry validation in your application before returning values to a database server.

Fields

Rather than presenting all the data in a table to the user (within the DBGrid), we might want to use field-oriented data aware components, such as edit boxes. The DBEdit component for example, is a data-aware version of the TEdit class. DBEdit is the building block of any data entry application.

One Two Three Levels

Of course, some applications you build may not need the benefits of a full DBMS, so a simple client-only solution might be sufficient. On the other hand, you might need some of the robustness of a DBMS system, but on a single, isolated computer. In this case, you can use a local version of a SQL server, such as InterBase. Traditional client server development is done with a two-tier architecture. However, if the DBMS is primarily performing data storage instead of data- and number-crunching, the client might contain both user interface code (formatting the output and input with customized reports, data-entry forms, query screens, and so on) and code related to managing the data (also known as business rules). In this case, it's generally a good idea to try to separate these two sections of the program and build a logical three-tier architecture. The term logical here means that there are still just two computers (that is, two physical tiers), but we've now partitioned the application...

Button Basics

The Default property is another key property of buttons. Windows has a standard mechanism for dealing with dialog boxes. One of the features of this mechanism is as follows If a control other than a button has keyboard focus and the user presses the Enter key on the keyboard, the dialog box will behave as if the user had clicked the default button. The default button is the button that has the BS_DEFPUSHBUTTON style set (usually the OK button). This feature has been the bane of programmers and the curse of data-entry personnel for years. The Default property is used to set a button as the default button for a form. The default value for this property is false. To make a button the default button, set its Default property to true. If you don't specifically set any button's Default property to true, the form will not close when the user presses the Enter key.

Series tab

Selecting the Series tab (or double clicking the desired Series) allows you to edit your Series. Select Series1. Select the DataSource tab. Select Dataset from the drop down list. Select AdoQuery1 for the dataset. The next set of choices determine the way how the data form the datasource will appear on the graph (different kinds of charts have different properties and methods). The exact contents of the page will change depending on the Series type you have chosen. The Bar property determines what value each bar is representing - pick SumItems from the list. The Labels property is used to draw labels for each of the bars in the graph. Note that Lables drop down does not list the Company field from the recordset

Searching for data

Note the rest of this chapter deals with the aboutdelphi.mdb MS Access database that was introduced in the first chapter of this course. To use the code examples presented in this chapter, set up the data form with the core components (dataaccess and data-aware) as described in the previous chapters. The following code examples will assume that you are working with the ADOTable component pointing to the Applications table in our database.

Symbols

Palette) 10-11, 99-100 data definition 13 Data Definition Language 180-182 data entry forms 102, 158, 183 data grids 99, 103-106 adding 103 displaying data 83 editing data 104 inserting records 104 linking to datasets 103 options 103-104 Data Manipulation Language data entry 102, 158, 183 designing 100 multi-table 24-30, 76 data entry 83, 84, 154 temporary files 57, 92, 149, 170

Lookup

Page 1 Why and when to use lookup fields Creating a data entry form Consider the next example. In our sample aboutdelphi.mdb database, Applications table lists Delphi applications uploaded by the visitors to this site. Among other fields, the Author and Type fields are linked with the corresponding fields in the Authors and Types tables. Only values from the AuthorName field in the Authors table can appear in the Author field of the Applications table. The same rule is applied to the TypeName field (Types table) and the Type field (Applications table). Another situation consider an application data entry form whose fields are connected to the Applications table. Let's say that this table has only one information related to the author of the application, an AuthorNo field corresponding to authors unique number. The Authors table, on the other hand, contains an AuthorNo field corresponding to authors UN, and also contains additional information, such as the authors name, email and a web...

Data filtering DB

To follow the article, set up the data form with the core components (data-access and data-aware) as described in the previous chapters. The next code examples will assume that you are working with the ADOTable component pointing to the Applications table in our working Access database.

The DBEdit Component

DBEdit is the basic building block of any type of data entry application This component is limited to a single line of text and both displays and opens the dataset field to modification. DBEdit offers some degree of control over the formatting of the data being input and displayed using a number of property settings. Similar to the previous component, DBEdit is a data-aware version of the TEdit class. Review the data type that needs to be supported to determine if this is the appropriate control to be used or if the data can be better represented using a DBMemo control.

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