duangai9678 2016-09-13 05:16
浏览 13

在PHP MySQL上选择嵌套记录

i have a table in database sql like below, and i want to display it based on id and how many record (generation)

+-------------------------------+
|      ID      |    Parent_ID   | 
+-------------------------------+
|      1       |        0       |
+-------------------------------+
|      2       |        1       |
+-------------------------------+
|      3       |        1       |
+-------------------------------+
|      4       |        2       |
+-------------------------------+
|      5       |        2       | 
+-------------------------------+
|      6       |        2       |
+-------------------------------+
|      7       |        2       |
+-------------------------------+
|      8       |        3       | 
+-------------------------------+
|      9       |        5       |
+-------------------------------+
|      10      |        7       |
+-------------------------------+
|      11       |       10      | 
+-------------------------------+
|      12       |       10      | 
.................................
The list goes on..

so if i want to select the ID = 2 and record from 1st generation to 4th generation, the result is gonna be like this

+-------------------------------+
|      ID      |    Parent_ID   | 
+-------------------------------+
|      2       |        1       |  -> 1st generation
+-------------------------------+
|      4       |        2       |  -> 2nd generation
+-------------------------------+
|      5       |        2       |  -> 2nd generation
+-------------------------------+
|      6       |        2       |  -> 2nd generation
+-------------------------------+
|      7       |        2       |  -> 2nd generation
+-------------------------------+
|      10      |        7       |  -> 3rd generation
+-------------------------------+
|      12       |       10      |  -> 4th generation
.................................

the generation is not always from first, so i start select from any generation position, any idea how to do this in php or php laravel using MySQL database?

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