Free Pascal / Lazarus: SQLite Database Tutorials: Reports with LazReport. Free Pascal Lazarus Project – Sync’ed with Lazarus SubVersion trunk every 15 minutes – alrieckert/lazarus. jesus LazReport, two additional export filters – TfrImageExportFilter, TfrH tutorials/stringgrid · LazReport, added stringgrid/variables tutorial from German.
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This page started as a translation of the Portuguese language Tutorial de LazReport tutorkal itself appears to be a translation from a French document. You’ll need to create a new application with a main form Form1. We’re assuming you already have your database set up as specified in SQLdb Tutorial0.
If not, please do so. Double-click on the TfrReport icon or right-click, Design Report to bring up the report designer:.
LazReport lets you link variable names to database fields or system values, in order to spare your end users from having to decipher cryptic field names. Click on the button Variables in order to define some variables. Write the contents according ot the following image. To differentiate the two, the variables start with a space. The distinction between variables and variables categories by starting variables with a space is needed unique and exclusively in this dialog Variables List.
Anywhere else Report Designer, main source code and scripts a variable should be invoked without spaces. As you can see, the category we defined is shown in the ComboBox above the variables. Each variable must be linked with a field. To do this, select the variable and then the field. Do this for all variables; the screenshot shows the link for Hire date:.
Lazarus: Reports with LazReport
After closing the variables editor, we’re back in our report designer. You may have noticed a small number of objects in the object bar to the left of the report surface. In the Report title band, add a rectangle. The text editor will show up. In the first line the title of the report should be indicated. On the the second, system date and time need to be added. They are obtained by clicking Variable and then Category Otherthen double-click on the desired variable once you are familiar with the variables, you can also just type them.
Click OK to exit the editor, then adjust the tutoria rectangle to the desired size. Choose a color for the background with the Bucket Fill button on the toolbar.
Let’s insert a master data band. The master band will be repeated for each record in the data source. You can double-click later on the band if you want to change the data source.
In futorial left half of the band we insert a rectangle and double click. The familiar text editor appears. Now we will add several fields in the one rectangle. If needed though, you can use one rectangle per field if lazreporg want to apply different formatting etc. The first line Name [Full name field] is obtained by writing Name and then, with the Variable button, entering the variable [Field Name]. Alternatively, as indicated before, you can write the resulting text directly.
This shows you can perform calculations with fields coming from the data source. Note the extra set of square brackets around the calculation.
LazReport Documentation – Free Pascal wiki
As you may guess, oazreport can not only use the variables listed via the Variable button, but also database fields via DB Field. You can use all kinds of operators and functions in your calculations; see LazReport Documentation Documentation for an overview. In the variable editor, let’s set a format.
To show the format editor, double click on a rectangle to get the Text Editor, then click the Format button. The second lets you select a preset format Other formatting options are present on the button bar below the menu e.
Highlighting is very useful for emphasizing data. You can specify a condition that determines when highlighting is applied.
For that, use the keyword Value to indicate the value of the variable. Here is the highlighting for all hire dates later than Because Hire date is a TDateTime field which internally is a floatI cheated by just using the float value of January 1st, which is By default highlighter is a simple bold on white background.
SQLite Database Tutorial: Report generator
You can set these parameters to an area by clicking the Highlight button. Now add some test data – the example here uses jpg files – into the PHOTO field with your favourite database tool. By default, Lazarus DBImage is more flexible and stores the file extension before the image data, allowing different file formats to be used.
For simplicity’s sake, we’ll use the Delphi approach. Now we have to tell the report you need to treat all data as binary jpg image files. If you don’t see the field, you may need to set the tutoril SQLQuery to inactive and active again to refresh the list of columns. Click on the Insert image A Picture editor shows up:.
If you wanted to always show the same picture, you’d just need tutogial click Load This turns the picture into an object associated with the data field. Press OK as needed to get back to the report designer.
Close the report editor and save the report definition with the same name, lazreporttutorial. Now let’s write the code required to load and view or edit our report. To this add the following code to the project:. You have a preview option that gives lazrsport users a way to modify the report without changing the basic application. Add a TButton component with Caption: Behind the scenes, a project dependency on the Printer4Lazarus packages will be added by the IDE, so make sure that package is installed.
It’s a bit long, but if lazteport, you can create a tutoriao of TfrReport with an easier printing method or classcreate a PrintReport Report: Choose desired margins, number of columns, and the space between them, layout order etc.
If you want to include the total number of pages with the page number on each page, tytorial need to select Two-pass report which tells Lazreport to build the report twice, inserting total number of pages on the second run. On the Other tab, you can fill out some report metadata, as is done on the screenshot below: Now we’ll add some report ttorial unrelated to the database data in our example.
They let you e.
To do this, open the report editor and select the File menu and the Variable List. Add a Test category, and a test1 variable the same way we did earlier with a space before the variable name:.
The only difference is that you will not select a value field, but leave None the default value: Return to Lazarus do not forget to save your report, if necessary and set up the OnGetValue event of the frReport1′ component by adding the following code:. Please verify this and adjust article if needed: Also, don’t we need to add a rectangle somewhere and show variable test1? TStream ; var GraphExt: TObject ; begin frReport1. ShowReport ; end ; TForm1.
DesignReport ; end. ChangePrinter indPrinter. String ; var ParValue: ShowReport ; end.
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