TSQLQuery

TSQLQuery is a component found in Delphi and C++Builder development environments, specifically within the FireDAC data access framework. It is designed to execute SQL statements against a database. Unlike components that primarily fetch data into a dataset for browsing, TSQLQuery is more focused on executing commands like INSERT, UPDATE, DELETE, or stored procedures. It can also be used to retrieve data, but its primary strength lies in its ability to interact with the database at a command level.

When a TSQLQuery component is used, developers can write SQL statements directly into its SQL property. This can be done at design time or dynamically at runtime. The component then uses the underlying database connection (established by a TSQLConnection component) to send these statements to the database server for execution. TSQLQuery offers properties and methods to handle parameters within SQL statements, making it possible to construct dynamic and secure queries. It also provides mechanisms for error handling and retrieving status information after command execution. While it can fetch data, it typically does so as a result of a SELECT statement, and often the fetched data is then processed or used to influence other operations rather than being directly presented to the user. It is a versatile tool for database manipulation and control within the FireDAC ecosystem.