sqlite_query
SQLiteDatabase->query
(No version information available, might be only in CVS)
SQLiteDatabase->query — Executes a query against a given database and returns a result handle
說明
Object oriented style (method):
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 參數接受一個常數並決定回傳的陣列如何索引。用 SQLITE_ASSOC 只會回傳關聯索引（有名稱欄位）而 SQLITE_NUM 只會回傳數字索引（有序欄位數）。SQLITE_BOTH 會同時回傳關聯和數字索引。 SQLITE_BOTH 是本函式的預設值。
- 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.
Note: 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 參數作為函式的第一個參數。
Return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.
更新日誌
| 版本 | 說明 |
|---|---|
| 5.1.0 | Added the error_msg parameter |
註釋
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).