When counting deleted records from the database, I realized that sqlite_changes() will return 0 if you are deleting all the records without including a WHERE clause.
So after "DELETE FROM users" sqlite_open() will print 0 even if rows where deleted, but if you use "DELETE FROM users WHERE 1" you will get the right result.
I had this problem on versions 5.0.4 and 4.4.0 under Windows servers.
sqlite_changes
SQLiteDatabase::changes
(PHP 5 < 5.4.0, PECL sqlite >= 1.0.0)
sqlite_changes -- SQLiteDatabase::changes — Returns the number of rows that were changed by the most recent SQL statement
说明
sqlite_changes
( resource
$dbhandle
) : int面向对象风格 (method):
public SQLiteDatabase::changes
( void
) : int
Returns the numbers of rows that were changed by the most recent SQL
statement executed against the dbhandle database
handle.
参数
-
dbhandle -
The SQLite Database resource; returned from sqlite_open() when used procedurally. This parameter is not required when using the object-oriented method.
返回值
Returns the number of changed rows.
范例
Example #1 过程化风格
<?php
$dbhandle = sqlite_open('mysqlitedb');
$query = sqlite_query($dbhandle, "UPDATE users SET email='jDoe@example.com' WHERE username='jDoe'");
if (!$query) {
exit('Error in query.');
} else {
echo 'Number of rows modified: ', sqlite_changes($dbhandle);
}
?>
Example #2 面向对象风格
<?php
$dbhandle = new SQLiteDatabase('mysqlitedb');
$query = $dbhandle->query("UPDATE users SET email='jDoe@example.com' WHERE username='jDoe'");
if (!$query) {
exit('Error in query.');
} else {
echo 'Number of rows modified: ', $dbhandle->changes();
}
?>
add a note
User Contributed Notes 2 notes
bermi ferrer:at-akelos dotCom ¶
19 years ago
jazz at funkynerd dot com ¶
14 years ago
When executing DELETEs, I found that adding an always true WHERE clause returns the number of rows deleted.
eg: "DELETE FROM my_table WHERE 1" will delete all the rows and sqlite_changes() will return the correct number of rows deleted.
