Adodb For Lazarus How To Connect To

Adodb For Lazarus How To Connect To

The ConnectionString property tells ADO how to connect to the datasource.

Zarko Gajic is experienced in SQL and has working knowledge of DB systems such as MS SQL Server, Firebird, Interbase, and Oracle.

This step-by-step guide describes how to connect to Microsoft Excel, retrieve sheet data, and enable editing of the data using the DBGrid.

Youll also find a list of the most common errors that might appear in the process, plus how to deal with them.

Creating an Excel spreadsheet editor using Delphi and ADO Retrieving the data from Excel.

A discussion on Excel field (column) types How to modify Excel sheets: edit, add and delete rows.

How to create a worksheet and fill it with custom data from an MS Access database.

Microsoft Excel is a powerful spreadsheet calculator and data analysis tool.

Since rows and columns of an Excel worksheet closely relate to the rows and columns of a database table, many developers find it appropriate to transport their data into an Excel workbook for analysis purposes; and retrieve data back to the application afterwards.

Automation provides a way to read Excel data using the Excel Object Model to dive into the worksheet, extract its data, and display it inside a grid-like component, namely DBGrid or StringGrid.

Automation gives you the greatest flexibility for locating the data in the workbook as well as the ability to format the worksheet and make various settings at run time.

To transfer your data to and from Excel without Automation, you can use other methods such as.

Since Excel is JET OLE DB compliant, you can connect to it with Delphi using ADO (dbGO or AdoExpress) and then retrieve the worksheets data into an ADO dataset by issuing an SQL query (just like you would open a dataset against any database table).

In this way, all the methods and features of the ADODataset object are available to process the Excel data.

In other words, using the ADO components let you build an application that can use an Excel workbook as the database.

Another important fact is that Excel is an out-of-process ActiveX server.

ADO runs in-process and saves the overhead of costly out-of-process calls.

When you connect to Excel using ADO, you can only exchange raw data to and from a workbook.

An ADO connection cannot be used for sheet formatting or implementing formulas to cells.

However, if you transfer your data to a worksheet that is pre-formatted, the format is maintained.

After the data is inserted from your application to Excel, you can carry out any conditional formatting using a (pre-recorded) macro in the worksheet.

You can connect to Excel using ADO with the two OLE DB Providers that are a part of MDAC: Microsoft Jet OLE DB Provider or Microsoft OLE DB Provider for ODBC Drivers.

Well focus on Jet OLE DB Provider, which can be used to access data in Excel workbooks through installable Indexed Sequential Access Method (ISAM) drivers.