How Can PDO Prepared Statements Optimize Bulk Data Insertion for Enhanced Security and Performance?

PDO Prepared Inserts: Enhancing Security and Performance for Bulk Data Insertion

In the realm of data manipulation, PDO prepared statements offer a superior level of security and performance compared to static queries. This extends to bulk data insertion, where multiple rows of values can be efficiently inserted with a single query.

One can leverage PDO's prepared statements to generate "inserting multiple rows of values by the use of one query." The key is to craft a structured query that accommodates multiple sets of values.

To illustrate, let's consider the following SQL statement:

INSERT INTO `tbl` (`key1`,`key2`) VALUES ('r1v1','r1v2'),('r2v1','r2v2'),...

In this statement, each set of values is enclosed within its own set of parentheses. To adapt this query for prepared inserts, we can utilize a placeholder sequence for each column and concatenate these placeholders to create the VALUES part.

For instance, if we have two columns, the VALUES part would be:

(?,?),

We then replicate this VALUES part for each row of data and separate them by a comma:

(?,?),
(?,?),
...

Finally, we can construct the complete query:

INSERT INTO `tbl` (`key1`,`key2`) VALUES
(?,?) ,
(?,?), ...

To execute this query with PDO, we prepare the statement and provide an array containing all the values using the execute() method. The code below demonstrates this approach:

$data = [['valueA1', 'valueB1'], ['valueA2', 'valueB2']];
$values = implode(',', array_fill(0, count($data[0]), '?'));
$sql = "INSERT INTO table (colA, colB) VALUES "
    . implode(',', array_fill(0, count($data), "($values)"))
    . ";";
$stmt = $db->prepare($sql);
$stmt->execute(array_merge(...$data));

This technique not only ensures data integrity by sanitizing input but also optimizes performance by executing a single query for multiple row insertions.

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