Storage and operation of tree structure in relational database

Through the tree structure of familiar storage mode in relational database study,put forward in the de- velopment of MIS applied in the tree structure of relational database storage mode--modified preorder traversal level sibling tree storage mode.The storage mode absorb characteristics form the level serial number and preorder traversal tree,can achieve effective tree structure common operation in MIS such as rooting path to a node,all children of a node,maintenance node.it has create conveniently and query agility highly-efficient characteristics.