sqlite_query

SQLiteDatabase::query

(PHP 5 < 5.4.0, PECL sqlite >= 1.0.0)

sqlite_query -- SQLiteDatabase::query — Executes a query against a given database and returns a result handle

Opis

sqlite_query ( resource $dbhandle , string $query [, int $result_type = SQLITE_BOTH [, string &$error_msg ]] ) : resource

sqlite_query ( string $query , resource $dbhandle [, int $result_type = SQLITE_BOTH [, string &$error_msg ]] ) : resource

Styl obiektowy (method):

public SQLiteDatabase::query ( string $query [, int $result_type = SQLITE_BOTH [, string &$error_msg ]] ) : SQLiteResult

Executes an SQL statement given by the query against a given database handle.

Parametry

dbhandle

The SQLite Database resource; returned from sqlite_open() when used procedurally. This parameter is not required when using the object-oriented method.

query

The query to be executed.

Data inside the query should be properly escaped.

result_type

Opcjonalny parametr result_type przyjmuje wartości stałych i określa jak indeksowane będą zwracane wartości. Używając SQLITE_ASSOC zwrócone zostaną tylko indeksy asocjacyjne (nazwy pól), podczas gdy SQLITE_NUM zwróci tylko indeksy numeryczne (numery pól). SQLITE_BOTH zwróci i indeksy asocjacyjne i numeryczne. SQLITE_BOTH jest domyślną wartością dla tej funkcji.

error_msg

The specified variable will be filled if an error occurs. This is specially important because SQL syntax errors can't be fetched using the sqlite_last_error() function.

Informacja: Obsługiwane są dwie alternatywne składnie, dla zachowania kompatybilności z rozszerzeniami dla innych baz danych (takich jak MySQL). Preferowana jest pierwsza, gdzie dbhandle jest pierwszym parametrem funkcji.

Zwracane wartości

This function will return a result handle lub FALSE w przypadku niepowodzenia. For queries that return rows, the result handle can then be used with functions such as sqlite_fetch_array() and sqlite_seek().

Regardless of the query type, this function will return FALSE if the query failed.

sqlite_query() returns a buffered, seekable result handle. This is useful for reasonably small queries where you need to be able to randomly access the rows. Buffered result handles will allocate memory to hold the entire result and will not return until it has been fetched. If you only need sequential access to the data, it is recommended that you use the much higher performance sqlite_unbuffered_query() instead.

Rejestr zmian

Wersja	Opis
5.1.0	Added the `error_msg` parameter

Notatki

Ostrzeżenie

SQLite will execute multiple queries separated by semicolons, so you can use it to execute a batch of SQL that you have loaded from a file or have embedded in a script. However, this works only when the result of the function is not used - if it is used, only the first SQL statement would be executed. Function sqlite_exec() will always execute multiple SQL statements.

When executing multiple queries, the return value of this function will be FALSE if there was an error, but undefined otherwise (it might be TRUE for success or it might return a result handle).

Zobacz też:

sqlite_unbuffered_query() - Execute a query that does not prefetch and buffer all data
sqlite_array_query() - Execute a query against a given database and returns an array

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