Introduction
It’s a reasonably safe bet that more than 80% of Visual Basic 6.0 projects written since Microsoft released the product on June 15, 1998 involve connections to one or more relational databases. Access 1.0 introduced the Joint Engine Technology (Jet) indexed sequential access method (ISAM) database and Embedded Basic, the forerunner of Visual Basic for Applications (VBA), in 1992. Access 1.0 and 1.1 enabled rapid application development (RAD) for Jet, as well as SQL Server 4.2 and other client/server database front ends that had Open Database Connectivity (ODBC) drivers. Visual Basic 3.0 introduced databinding and the first databound grid control in 1993, which resulted in a flood of books and magazine articles devoted to VB database programming with SQL and ODBC. Visual Basic 4.0 introduced 32-bit projects but wasn’t a robust development platform. 1995’s Visual Basic 5.0 added ActiveX Data Objects (ADO) 1.0 and OLE DB. VB and VBA became the world’s most popular programming languages with an estimated three million users. By 1998 most professional VB6 developers were writing production-grade Windows front ends for client/server databases and began to adopt Microsoft Transaction Server 1.0 for three-tier, distributed data access architectures. Developers wrote billions of lines of data-intensive VB code during the following four years.
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