sqlite_query
(PHP 5)
sqlite_query(no version information, might be only in CVS)
SQLiteDatabase->query -- Executes a query against a given database and returns a result handle說明
resource sqlite_query ( resource dbhandle, string query [, int result_type [, string &error_msg]] )resource sqlite_query ( string query, resource dbhandle [, int result_type [, string &error_msg]] )
Object oriented style (method):
class SQLiteDatabase {SQLiteResult query ( string query [, int result_type [, string &error_msg]] )
}
Executes an SQL statement given by the query against a given database handle.
參數
- 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.
- result_type
可選的 result_type 參數接受一個常量並決定返回的陣列如何索引。用 SQLITE_ASSOC 只會返回關聯索引（有名稱欄位）而 SQLITE_NUM 只會返回數字索引（有序欄位數）。SQLITE_BOTH 會同時返回關聯和數字索引。 SQLITE_BOTH 是本函數的預設值。
- 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.
注: 為相容其它資料庫（例如 MySQL），支援另兩種替代的語法。推薦用第一種，dbhandle 參數作為函數的第一個參數。
返回值
This function will return a result handle or FALSE on failure. 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.
注解
| 警示 |
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). |