dbstring ( numeric_expression )
dbstring ( database_number , numeric_expression )
dbstring ( database_number , database_recordset_number , numeric_expression )
dbstring ( string_expression )
dbstring ( database_number , string_expression )
dbstring ( database_number , database_recordset_number , string_expression )

returns string_expression

Return a string from the specified column number or name of the current row of the open recordset. If the field is a NULL value the empty string “” will be returned. NULL may be tested for by using the DBNull function.

See example of usage on DBOpen page.

More information about databases in general and SQLite specifically can be found at SQLite Home Page and SQL at Wikipedia.