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- PHP PDO PREPARED STATEMENTS UPDATE
- PHP PDO PREPARED STATEMENTS FULL
- PHP PDO PREPARED STATEMENTS CODE
Using a couple of extended classes, each just having a single simple extra method each, I achieved a 1000 inserts in 0.018 seconds. $stmt = $db->multiPrepare('INSERT INTO members (firstname, surname, title)', $data) //New Method
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$db = new mPDO('mysql:host=localhost dbname=myDB','root','') //NOTE the extended mPDO class
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$data = array_fill(0, 1000, $d) //create an array of 1000 records
PHP PDO PREPARED STATEMENTS FULL
This isn't quite as straightforward any more as we need to use placeholders to take full advantage of security benefits. So, really, really disappointed with this, I thought I'd try the old way of building a long SQL statement. OK, I'm not using transaction/commit, but still that's some serious arse-dragging. Well I did and it timed out (>30 seconds). Perhaps you're wondering why I didn't use a higher number like 10,000?
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This test gave repeated results between 3.07 and 3.18 seconds. $stmt = $db->prepare('INSERT INTO members (firstname, surname, title) VALUES (?,?,?)') $db = new PDO('mysql:host=localhost dbname=myDB','root','') $data = array_fill(0, 1000, $d) //create 1000 identical members I'm using a simple 'members' table: id (PK/int) | firstname (varchar/25) | surname (varchar/25) | title (tinyint/1) $d = So should I now dump that for "multiple executes" in my array loop? Well I tried. Now previous to using prepared statements, I used to build up a long SQL 'VALUES' clause by looping through an array of "records" to insert, instead of running an INSERT query on every 'record' in the array. I love PDO, and I thought that the "prepare once, execute many" idea behind prepared statements was beautiful. If($count != false) echo 'Affected rows: '.I've been playing with PDO and got quite a shock, so I thought I'd run this past you all. If the query is succesfully performed ($count not false) $sql = "DELETE FROM `sites` WHERE `category` IN('education', 'programming')" Delete rows in "sites", according to the value of "category" column The next example deletes all the rows in the "sites" table where the value in "category" column is " education" or " programming". Syntax: $objPDO->exec("DELETE FROM `table_name` WHERE condition") The DELETE instruction deletes rows in a table. So, it is indicated to use this statement to check the result: if($count != false).
PHP PDO PREPARED STATEMENTS UPDATE
Sometimes an UPDATE query not affect any row (if the condition not matches), and will return 0. The $count variable stores the number of affected rows (added).
PHP PDO PREPARED STATEMENTS CODE
This code adds 3 rows in the "sites" table. If($count != false) echo 'Number of rows added: '. If data added ($count not false) displays the number of rows added ('English Courses', 'foreign languages', '/engleza')" ('PHP-MySQL Course', 'programming', '/php-mysql'), ('Courses - Tutorials', 'education', ''), $sql = "INSERT INTO `sites` (`name`, `category`, `link`) $objPDO->exec("INSERT INTO `table_name` (`column1`, `column2`. If the table is created, the code above will display: If($conn->exec($sql) != false) echo 'The sites table is created' // If the result is not false, display confirmation ) CHARACTER SET utf8 COLLATE utf8_general_ci" `id` int(8) NOT NULL AUTO_INCREMENT PRIMARY KEY , In the next example it is created in a database named "tests" a table named "sites", with 4 colummns: "id", "name", "category", and "link".Įxec("SET CHARACTER SET utf8") // Sets encoding UTF-8 All these instructions are added after the PDO object is created, containing the connection to MySQL database. To create a table in a MySQL database, use the " CREATE TABLE `table_name`" query, and the exec() method: $objPDO->exec("CREATE TABLE `table_name` (`column1` TYPE, `column2` TYPE. These queries are send as a string to the MySQL server. To work with databases in PHP, you must know the specific SQL queries as: CREATE TABLE, INSERT, SELECT, UPDATE, etc.