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Databases - Delphi Database Connections Delphi is a great language, but, based on the help files, how to connect it to databases is not exactly clear. On the tools pallette, there are 2 applicable tabs • Data Access • Data Controls The data controls are actually fairly simple to connect once the data access is configured. Just use the pick lists to set Data Source and Data Field, in that order. Therefore, this page will discuss setting the Data Access components which are used to define Data Sources. TTable ->TDataSource ->TQuery TTable ->TDataSource ->TDBComboBox TDatabase ->TTable ->TDataSource ->TDBComboBox TTable connects to an ODBC database, a directory for Paradox tables, or a TDatabase component. DatabaseName, TableName The pick list on TTable.DatabaseName lists available ODBC aliases and TDatabase.DatabaseName values.

TDataSource - DataSet (TDataSet/TTable) Use this to handle record level processing. It keeps all related controls pointing to the same record. All data aware components must attach to a DataSource. Metin2 Ro Hack Yang Gratis. TDBComboBox - DataSource (TDataSource), DataField First, Next, Last (and the like) are abstract members of TDataSet.

DataSet is a property of TDataSource. TTable is a desendent of TDataSet.

Use TDatabase when you are using the BDE. Explicit declaration is not necessary unless you want access to the properties and methods at run time. The main advantage is the ability to disable the username/password request dialog box and/or to supply that data programatically. If a TTable is used without explicitly associating it to an existing TDatabase, then an implicit TDatabase is created as necessary to control the connection.

Place 3 components on a new (blank) Form. • Data Access / Table• Data Access / DataSource• Data Controls / DBGrid Set the following properties Table1.DatabaseName Select from the list of ODBC databases. (I am assuming that your system has at least one defined.) Table1.TableName Pick a value from the list of available tables. (You will probably be prompted for a username and password.) Table1.Active Set this to True.

(The default is always false. Aris 7 Keygen there. True allows you to see data, False does not.) DataSource1.DataSet Pick the only value from the picklist.

(This will be the TTable added ealier.) DBGrid1.DataSource Pick the only option from the picklist. At this point, the table's data should be visible. In order to step through the records, double click the TTable component (this opens the Fields editor dialog box) and use the VCR buttons to step through the records. Use TDatabase if you want to connect to several tables in the same database, or if you want to suppress the annoying login prompt (You bet I want to:). Database1.AliasName Select from the list of ODBC or BDE database aliases. (I am assuming that your system has at least one defined.) Setting this clears Database1.DatabaseName. Database1.DatabaseName This is the name that TTable components will link to.

This can be the same as Database1.AliasName, you may make up a name, or you may enter the fully qualified path to a Paradox database (directory). An MS Access mdb file can not be entered here. Database1.LoginPrompt Set this False to disable the default dialog box. Database1.OnLogin Attaching code to this event will also disable the default dialog box. (Hardcoding userID's and passwords is considered to be a security problem.) Database1.Params If Database1.AliasName is blank, and Database1.DriverName is assigned to MSACCESS, then this is how to specify an MS Access database.