Bu SQL sorgusu ?
karakter ne demek?
$res = $dbConn->fetchPairs('SELECT name FROM tree where parent = ?',$key);
Bu bir sorgu parameter. Değeri derleme zamanında bilinen değil - bu değişken $ anahtarının içeriğini kullanarak zamanında belirlenir.
Diğer gösterimler de parametrelerini belirtmek için mevcuttur:
?NNN A question mark followed by a number NNN holds a spot for the NNN-th parameter. NNN must be between 1 and SQLITE_MAX_VARIABLE_NUMBER. ? A question mark that is not followed by a number holds a spot for the next unused parameter. :AAAA A colon followed by an identifier name holds a spot for a named parameter with the name AAAA. Named parameters are also numbered. The number assigned is the next unused number. To avoid confusion, it is best to avoid mixing named and numbered parameters. @AAAA An "at" sign works exactly like a colon. $AAAA A dollar-sign followed by an identifier name also holds a spot for a named parameter with the name AAAA. The identifier name in this case can include one or more occurances of "::" and a suffix enclosed in "(...)" containing any text at all. This syntax is the form of a variable name in the Tcl programming language. The presence of this syntax results from the fact that SQLite is really a Tcl extension that has escaped into the wild.
Genellikle denen kullanılır. stored procedures or prepared-statements