Use recursion to delete all child nodes of the tree structure (Java and MySQL Implementation)

1. Business scenario

It has the following tree structure: + - 0 + - 1 + - 2 + - 4 + - 5 + - 3

If you delete a parent node, its child nodes and the child nodes of its child nodes, and so on, you need to delete them all.

2. Java implementation

A map is used to store data in the tree structure. The ID is the key of the map and the PID is the value of the tree structure.

3. SQL implementation

Using stored procedures, all child nodes are stored in a temporary table.

After the stored procedure is executed, a temporary table will be generated. The ID is the child node ID to be deleted, nlevel is the node depth, and Scort is the sorting field.

Create a table and insert data:

Create and call stored procedures:

The following are the child nodes to be deleted:

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