WordPress のコメントを MySQL から削除

WordPressのコメントスパム。フィルターを入れているのだけれどもどうもうまく効いていない。一括でMySQLから削除。

# 傾向を分析

```

mysql> select comment_content  from wp_comments limit 5;
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| comment_content                                                                                                                                                                                                                                                                                                                                                          |
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
5 rows in set (0.00 sec)
```
そもそも、どれだけあるのかな。

```

mysql> select count(comment_content)  from wp_comments;
+------------------------+
| count(comment_content) |
+------------------------+
|                 206434 |
+------------------------+
1 row in set (21.96 sec)
```

# 作戦

- なるべくSPAMではないコメントを温存したい
- http: が入っているコメントというだけで削除はしない
- <a href~ が入っていると削除
- あとはキーワードでひっかける

# 削除作業

hrefが含まれているのを削除

```

mysql> select count(comment_content)  from wp_comments where comment_content LIKE '%href%';
+------------------------+
| count(comment_content) |
+------------------------+
|                 170947 |
+------------------------+
1 row in set (21.89 sec)
 delete  from wp_comments where comment_content LIKE '%href%';
Query OK, 170947 rows affected (42.33 sec)
```

キーワード、Store, Sale

```
mysql> delete  from wp_comments where comment_content LIKE '%Store%';
Query OK, 1216 rows affected (0.23 sec)

mysql> delete  from wp_comments where comment_content LIKE '%Sale%';
Query OK, 2683 rows affected (0.19 sec)

```

# 長文コンテンツを消す

```

mysql> select comment_content  from wp_comments limit 20;
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| comment_content                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| [&#8230;] OPENSOURCE HARDWARE COUNFERENCE http://oshwc.project2108.com/event/oshwc2014tokyowinter/ [&#8230;]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
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ニューバランス 996 http://www.lanapengarsnabbt.net/includes/NB-9132.html                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
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+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
20 rows in set (0.00 sec)
```

長文のコメントはSPAMと判定してもいいでしょうね。

```

mysql> select count(comment_content)  from wp_comments where char_length(comment_content)>10;
+------------------------+
| count(comment_content) |
+------------------------+
|                  29832 |
+------------------------+
1 row in set (0.08 sec)

mysql> select count(comment_content)  from wp_comments where char_length(comment_content)>100;
+------------------------+
| count(comment_content) |
+------------------------+
|                  21242 |
+------------------------+
1 row in set (0.07 sec)

mysql> select count(comment_content)  from wp_comments where char_length(comment_content)>1000;
+------------------------+
| count(comment_content) |
+------------------------+
|                   1732 |
+------------------------+
1 row in set (0.08 sec)

```
とりあえず1000以上を消しました

```

mysql> delete  from wp_comments where char_length(comment_content)>1000;
Query OK, 1732 rows affected (0.11 sec)

mysql> select count(comment_content)  from wp_comments;
+------------------------+
| count(comment_content) |
+------------------------+
|                  29856 |
+------------------------+
1 row in set (0.01 sec)

```
まだ結構ありますね。500以上も消すことにします。

```

mysql> delete  from wp_comments where char_length(comment_content)>500;
Query OK, 3395 rows affected (0.09 sec)

```

あとは、チマチマと。

```
mysql> delete  from wp_comments where comment_content LIKE '%friend%';
Query OK, 207 rows affected (0.06 sec)

mysql> delete  from wp_comments where comment_content LIKE '%brother%';
Query OK, 41 rows affected (0.06 sec)

mysql> delete  from wp_comments where comment_content LIKE '%gift%';
Query OK, 35 rows affected (0.06 sec)

mysql> delete  from wp_comments where comment_content LIKE '%bag%';
Query OK, 893 rows affected (0.08 sec)

mysql> delete  from wp_comments where comment_content LIKE '%Outlet%';
Query OK, 1202 rows affected (0.08 sec)

mysql> select count(comment_content)  from wp_comments;
+------------------------+
| count(comment_content) |
+------------------------+
|                  24083 |
+------------------------+
1 row in set (0.01 sec)


mysql> delete  from wp_comments where comment_content LIKE '%Apple%';
Query OK, 44 rows affected (0.07 sec)

mysql> delete  from wp_comments where comment_content LIKE '%YouTube%';
Query OK, 561 rows affected (0.07 sec)

mysql> delete  from wp_comments where comment_content LIKE '%wildlife%';
Query OK, 8 rows affected (0.05 sec)

mysql> delete  from wp_comments where comment_content LIKE '%Sweet%';
Query OK, 35 rows affected (0.06 sec)

mysql> delete  from wp_comments where comment_content LIKE '%people%';
Query OK, 454 rows affected (0.06 sec)

mysql> select comment_content  from wp_comments limit 20;

mysql> delete  from wp_comments where comment_content LIKE '%pretty%';
Query OK, 81 rows affected (0.05 sec)

mysql> delete  from wp_comments where comment_content LIKE '%beautiful%';
Query OK, 27 rows affected (0.06 sec)
mysql> select count(comment_content)  from wp_comments;
+------------------------+
| count(comment_content) |
+------------------------+
|                  22874 |
+------------------------+
1 row in set (0.01 sec)

```

今日はここまで。まだまだ精進が必要ですな。