Introduction - If you have any usage issues, please Google them yourself
Delphi: Delphi achieved Login Form Description: This form login form for the program, it does not automatically created by the program, see the menu Project-> Options-> Auto-ceate Form, ShowLoginForm () in creating/using/off/release. Login Form calling methods, using this method can reduce the amount of code to call at, but also facilitate unified operation of the form, because of the need to query the database, it cited DataModule units. Action attributes associated with the corresponding button on the Action object, the button will get some properties from the Action object, such as Caption, etc. When the form is released, do not forget to turn off Dataset, or directly close the database connection, the following two Close any different, please think for themselves.