用php调数据库做树状显示

就好像>

树形结构统一使用下面的测试表与测试数据

CREATE TABLE test_tree (

test_id INT,

pid INT,

test_val VARCHAR(10),

PRIMARY KEY (test_id)

);

INSERT INTO test_tree VALUES(1, NULL, 'NET');

INSERT INTO test_tree VALUES(2, 1, 'C#');

INSERT INTO test_tree VALUES(3, 1, 'J#');

INSERT INTO test_tree VALUES(4, 1, 'ASPNET');

INSERT INTO test_tree VALUES(5, 1, 'VBNET');

INSERT INTO test_tree VALUES(6, NULL, 'J2EE');

INSERT INTO test_tree VALUES(7, 6, 'EJB');

INSERT INTO test_tree VALUES(8, 6, 'Servlet');

INSERT INTO test_tree VALUES(9, 6, 'JSP');

INSERT INTO test_tree VALUES(10, NULL, 'Database');

INSERT INTO test_tree VALUES(11, 10, 'DB2');

INSERT INTO test_tree VALUES(12, 10, 'MySQL');

INSERT INTO test_tree VALUES(13, 10, 'Oracle');

INSERT INTO test_tree VALUES(14, 10, 'SQL Server');

INSERT INTO test_tree VALUES(15, 13, 'PL/SQL');

INSERT INTO test_tree VALUES(16, 15, 'Function');

INSERT INTO test_tree VALUES(17, 15, 'Procedure');

INSERT INTO test_tree VALUES(18, 15, 'Package');

INSERT INTO test_tree VALUES(19, 15, 'Cursor');

INSERT INTO test_tree VALUES(20, 14, 'T-SQL');

Oracle

使用 START WITH CONNECT BY

语句实现树状查询

SQL> ed

Wrote file afiedtbuf

1 SELECT

2 LPAD(' ', 2(LEVEL-1)) || test_val AS test_val

3 FROM

4 test_tree

5 START WITH

6 test_id IN (1, 6, 10)

7 CONNECT BY PRIOR test_id = pid

SQL> /

TEST_VAL

-----------------------------------------------------------

NET

C#

J#

ASPNET

VBNET

J2EE

EJB

Servlet

JSP

Database

DB2

TEST_VAL

-----------------------------------------------------------

MySQL

Oracle

PL/SQL

Function

Procedure

Package

Cursor

SQL Server

T-SQL

20 rows selected

SQL Server

使用 Common Table Expression (CTE) 来实现 递归调用。

1> WITH StepCTE

2> AS

3> (

4> SELECT

5> test_id,

6> pid,

7> test_val,

8> 1 as Lev

9> FROM

10> test_tree

11> WHERE

12> test_id IN (1,6,10)

13> UNION ALL

14> SELECT

15> Ttest_id,

16> Tpid,

17> Ttest_val,

18> CTELev + 1

19> FROM

20> test_tree T INNER JOIN StepCTE CTE

21> ON Tpid = CTEtest_id

22> )

23> SELECT

24> test_id, pid, test_val, Lev

25> FROM StepCTE;

26> go

test_id pid test_val Lev

----------- ----------- ---------- -----------

1 NULL NET 1

6 NULL J2EE 1

10 NULL Database 1

11 10 DB2 2

12 10 MySQL 2

13 10 Oracle 2

14 10 SQL Server 2

20 14 T-SQL 3

15 13 PL/SQL 3

16 15 Function 4

17 15 Procedure 4

18 15 Package 4

19 15 Cursor 4

7 6 EJB 2

8 6 Servlet 2

9 6 JSP 2

2 1 C# 2

3 1 J# 2

4 1 ASPNET 2

5 1 VBNET 2

(20 行受影响)

以上就是关于用php调数据库做树状显示全部的内容，包括:用php调数据库做树状显示、怎么将数据库中存的树转化为树形列表、带数据库的树形目录菜单怎么制作等相关内容解答，如果想了解更多相关内容，可以关注我们，你们的支持是我们更新的动力！