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Inserting Data

Leaf DB has provided really simple, but very helpful methods for inserting data into the database.

db insert

Saving data

We user $db->insert to save data in the database. insert takes in a "table" to insert data, "column(s)" and "value(s)":

$db->insert("posts", "title", "This is post One");

You can also add multiple columns like so:

$db->insert("posts", "title, body", "post One, This is the body of post One");

Using Prepared Statements

Prepared statements help protect against SQL injection,...

$db->insert("posts", "title, body", "?, ?", ["post One, This is the body of post One"]);

Db add

add simply offers a more consice, powerful way to retrieve data from a database. It also uses prepared statements by default, so you're safe in that respect.

Instead of several parameters in $db->insert, $db->add takes in an array with key-value pairs to be saved in the database.

$db->add("posts", ["title" => "Post One", "body" => "This is the body"]);

// $db->add($table, $params_to_insert);


Let's say you want to check whether the username a user just entered has been taken, you'd have to write a bunch of conditional code, making the code count larger and more error prone, right?

Well, add solves this problem smoothly. add has a 3rd parameter: an array of unique values which makes sure that the same value can't be saved twice.

$db->add("users", ["name" => "mychi", "email" => "", "pass" => "1234"], ["name", "email"]);

So, we're telling add to alert us if someone has already registered with the name mychi or the email This is because we passed ["name", "email"] as the 3rd param to add

With uniques, you can cut down on your whole app: For instance, if you know the exact data you'll be receiving in your app, let's say a username, email and password from a register form, you can do something like this:

$app->post("/register", function () use($app, $db) {
  $db->add("users", $app->request->body(), ["username", "email"]);

So, we pass in the entire request body, which contains the username, email and password. Simple right?


add also has inbuilt validation which validates parameters according to set rules. This uses the Leaf\Form->validate method. You can check it out for more information on validation.

add takes in a 4th parameter which is a boolean, this is whether of not to validate the data passed into add using the default checks.

By default, add validates values with the keys: email, username and any other field is marked as required. If any of the validations fail, an error is raised. You can turn this feature off:

$db->add("posts", ["title" => "Post One", "body" => "..."], ["title"], false);

Custom Validation

This is the 5th parameter of add. These are custom rules that you set to validate.

$db->add("posts", ["title" => "Post One", "body" => "..."], ["title"], false, [
  "author" => "validUsername"

Here, we're telling add that the author parameter should be a valid username. If thiscondition(rule) is not met, the application throws an error and breaks.

You can view all validation rules here

$db->add($table, $params, $uniques, $defaultChecks, $validation);
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