数据库架构 Treeview PHP MYSQL

Question

I am trying to create a treeview (ideally using bootstrap) from a MYSQL database table that is essentially a data dictionary structure. Every example I have seen creates a parentid in order to create the json/array input for the treeview however my data structure has all of the hierarchy levels on each line.

The hierarchy would be:

• Database

  • Schemas
    • Tables

• Database

  • Schemas
    • Tables

My database table has 3 columns... database, schema, and table. Each row has all three attributes, so the full hierarchy. What makes this a bit more tricky is the same schema and table can exist in multiple databases.

Any ideas for how I should go about approaching this?

Or perhaps as mentioned below how would I go from an array to a nested array of JavaScript objects that is the input of a treeview?

Here is the php for creating the array:

$stmt = $pdo->prepare('SELECT * FROM MyTable');
$stmt->execute();

$result = $stmt->fetchAll(PDO::FETCH_ASSOC);
print_r($result);

Database Structure and Data Image

Answer 1

You'll need to iterate through all rows and insert them into an appropriate map(associative array) in order to "inflate" the data structure.

Something like this:

//Fetch all rows from database into $result
$databases=[];
foreach($result as $row){
    $database=$row["database"];
    $schema=$row["schema"];
    $table=$row["object"];
    if(!array_key_exists($database, $databases))
        $databases[$database]=[];
    if(!array_key_exists($schema, $databases[$database]))
        $databases[$database][$schema]=[];
    array_push($databases[$database][$schema], $table);
}