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In-depth study of keyword matching projects (2) - the introduction of the idea of ​​sub-tables

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Release： 2016-08-08 09:31:53
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(2) Introduction of the idea of ​​sub-table

Recent articles: 1) Architecture application of high concurrent data collection (Redis application)

                                  2) Highly available data collection platform (how to play with 3 languages ​​php+.net+aauto)

Teaching you step by step how to do keyword matching projects has basically been completed. In-depth research is to analyze the performance of the system and make some changes that must be made under the stimulation of some environments.

Teach you step by step how to do a keyword matching project: Teach you step by step how to do a keyword matching project (search engine)----Day 1~Teach you step by step how to do a keyword matching project (search engine)----Twenty-two Days (22 articles in total)

In-depth research: The previous section talked about in-depth research on keyword matching projects-the introduction of filters.

Each article will be divided into the causes of the problem, solutions and some necessary implementation plans.

This article officially begins.

Cause of the problem

With the explosive growth of automatically collected data, the capacity of the lexicon is increasing day by day, from a few watts of data to millions of data. Xiao Shuaishuai feels more and more powerless looking at the queries in the database.

In addition, what little Ding Ding often says to Xiao Shuai Shuai the most is: When can I choose words faster? Every time I wait for a long time and there is no response, I am really anxious to death.

焦 焦

is also more anxious and mentally powerful. I really feel that this is the challenge. Xiao Shuaishuai had no choice but to continue to find the boss, asking him to reward him with a clever trick.

Boss Yu patted Xiao Shuaishuai on the shoulder: Young man, you know how difficult the project is!

道 Xiao Shuai Shuai replied: Don't get rid of me, I have deeply felt it, I think my heart may not be able to bear it anymore.

点 点

: You can't bear this, then it is estimated that some will be given you in the future.

哥 Little handsome: big brother, let alone these virtual behaviors, hurry up.

啥

: What is anxious, things can't be anxious, come over, brother will give you a bright road.

“Does each baby have a category attribute? How many words can these millions of data really belong to this category? Assuming that we only take the vocabulary of this category, can our project continue to be stable?”

Solution

According to certain business needs, we can split the data table vertically or horizontally, which can effectively optimize performance.

称 Vertical segmentation is also called column segmentation. It is a relatively suitable state to ensure that the unused columns or long fields are divided to ensure that the entity is in a relatively applicable state.

称 Horizontal segmentation is also called row segmentation. According to the records of some business split data, it is stored in different tables. The common ones are operated by the date.

This case uses horizontal segmentation to split the data into categories.

Implementation plan

        In order not to change the structure of the data table, we designed it this way. We use the table name to distinguish which data table the project uses. The changes resulting from this are relatively few. We only need to slightly change the code to solve it, which is a very frustrating thing.

                                                                                                                                          Modify the code of Keyword and add the data source to obtain. 

<?<span>php
</span><span>define</span>('DATABASE_HOST','127.0.0.1'<span>);
</span><span>define</span>('DATABASE_USER','xiaoshuaishuai'<span>);
</span><span>define</span>('DATABASE__PASSWORD','xiaoshuaishuai'<span>);
</span><span>define</span>('DATABASE_CHARSET','utf-8'<span>);

</span><span>class</span><span> Keyword {

    </span><span>public</span> <span>$word</span><span>;

    </span><span>public</span> <span>static</span> <span>$conn</span> = <span>null</span><span>;

    </span><span>public</span> <span>function</span><span> getDbConn(){
        </span><span>if</span>(self::<span>$conn</span> == <span>null</span><span>){
            self</span>::<span>$conn</span> = <span>mysql_connect</span>(DATABASE_HOST,DATABASE_USER,<span>DATABASE__PASSWORD);
            </span><span>mysql_query</span>("SET NAMES '".DATABASE_CHARSET."'",self::<span>$conn</span><span>);
            </span><span>mysql_select_db</span>("dict",self::<span>$conn</span><span>);
            </span><span>return</span> self::<span>$conn</span><span>;
        }
        </span><span>return</span> self::<span>$conn</span><span>;
    }


    </span><span>public</span> <span>function</span><span> save(){

        </span><span>$sql</span> = "insert into keywords(word) values ('<span>$this</span>->word')"<span>;
        </span><span>return</span> <span>mysql_query</span>(<span>$sql</span>,<span>$this</span>-><span>getDbConn());
    }

    </span><span>public</span> <span>static</span> <span>function</span> getWordsSource(<span>$cid</span>,<span>$limit</span>=0,<span>$offset</span>=40<span>){
        </span><span>$sql</span> = "SELECT * FROM　keywords_<span>$cid</span> LIMIT <span>$limit</span>,<span>$ffset</span>"<span>;
        </span><span>return</span> DB::MakeArray(<span>$sql</span><span>);
    }

    </span><span>public</span> <span>static</span> <span>function</span> getWordsCount(<span>$cid</span><span>){
          </span><span>$sql</span> = "SELECT count(*) FROM　keywords_<span>$cid</span>"<span>;
        </span><span>return</span> DB::QueryScalar(<span>$sql</span><span>);

    }

}</span>
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New QueryScalar has been added to the DB class, which is used to calculate the total amount

<?<span>php
</span><span>#</span><span>@author oShine</span>
<span>define</span>('DATABASE_HOST','127.0.0.1'<span>);
</span><span>define</span>('DATABASE_USER','xiaoshuaishuai'<span>);
</span><span>define</span>('DATABASE__PASSWORD','xiaoshuaishuai'<span>);
</span><span>define</span>('DATABASE_CHARSET','utf-8'<span>);

</span><span>class</span><span> DB {

    </span><span>public</span> <span>static</span> <span>$conn</span> = <span>null</span><span>;

    </span><span>public</span> <span>static</span> <span>function</span><span> Connect(){
        </span><span>if</span>(self::<span>$conn</span> == <span>null</span><span>){
            self</span>::<span>$conn</span> = <span>mysql_connect</span>(DATABASE_HOST,DATABASE_USER,<span>DATABASE__PASSWORD);
            </span><span>mysql_query</span>("SET NAMES '".DATABASE_CHARSET."'",self::<span>$conn</span><span>);
            </span><span>mysql_select_db</span>("dict",self::<span>$conn</span><span>);
            </span><span>return</span> self::<span>$conn</span><span>;
        }
        </span><span>return</span> self::<span>$conn</span><span>;
    }

    </span><span>public</span> <span>static</span> <span>function</span> Query(<span>$sql</span><span>){
       </span><span>return</span> <span>mysql_query</span>(<span>$sql</span>,self::<span>Connect());
    }

    </span><span>public</span> <span>static</span> <span>function</span> makeArray(<span>$sql</span><span>){
        </span><span>$rs</span> = self::Query(<span>$sql</span><span>);
        </span><span>$result</span> = <span>array</span><span>();
        </span><span>while</span>(<span>$data</span> = <span>mysql_fetch_assoc</span>(<span>$rs</span><span>)){
            </span><span>$result</span>[] = <span>$data</span><span>;
        }
        </span><span>return</span> <span>$result</span><span>;
    }

    </span><span>public</span> <span>static</span> <span>function</span> QueryScalar(<span>$sql</span><span>){
         </span><span>$rs</span> = self::Query(<span>$sql</span><span>);
         </span><span>$data</span> = <span>mysql_fetch_array</span>(<span>$rs</span><span>);
         </span><span>if</span>(<span>$data</span> == <span>false</span> || <span>empty</span>(<span>$data</span>) || !<span>isset</span>(<span>$data</span>[1])) <span>return</span> 0<span>;
         </span><span>return</span> <span>$data</span>[1<span>];
    }
} </span>
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Modify the Selector code for word selection: 

<?<span>php
</span><span>#</span><span>@Filename:selector/Selector.php</span><span>
#</span><span>@Author:oshine</span>

<span>require_once</span> <span>dirname</span>(<span>__FILE__</span>) . '/SelectorItem.php'<span>;
</span><span>require_once</span> <span>dirname</span>(<span>__FILE__</span>) . '/charlist/CharList.php'<span>;
</span><span>require_once</span> <span>dirname</span>(<span>__FILE__</span>) . '/charlist/CharlistHandle.php'<span>;
</span><span>require_once</span> <span>dirname</span>(<span>dirname</span>(<span>__FILE__</span>)) . '/lib/Logger.php'<span>;

</span><span>class</span><span> Selector
{

    </span><span>private</span> <span>static</span> <span>$charListHandle</span> = <span>array</span><span>(
        </span>"黑名单" => "BacklistCharListHandle",
        "近义词" => "LinklistCharListHandle"<span>
    );

    </span><span>public</span> <span>static</span> <span>function</span> select(<span>$num_iid</span><span>)
    {
        </span><span>$selectorItem</span> = SelectorItem::createFromApi(<span>$num_iid</span><span>);

        Logger</span>::trace(<span>$selectorItem</span>-><span>props_name);

        </span><span>$charlist</span> = <span>new</span><span> CharList();

        </span><span>foreach</span> (self::<span>$charListHandle</span> <span>as</span> <span>$matchKey</span> => <span>$className</span><span>) {

            </span><span>$handle</span> = self::createCharListHandle(<span>$className</span>, <span>$charlist</span>, <span>$selectorItem</span><span>);
            </span><span>$handle</span>-><span>exec</span><span>();

        }

        </span><span>$selectWords</span> = <span>array</span><span>();

        </span><span>$wordsCount</span> = Keyword::getWordsCount(selectorItem-><span>cid);
        </span><span>$offset</span> = 40<span>;
        </span><span>$page</span> =  <span>ceil</span>(<span>$wordsCount</span>/<span>$offset</span><span>);
        </span><span>for</span>(<span>$i</span>=0;<span>$i</span><=<span>$page</span>;<span>$i</span>++<span>){
            </span><span>$limit</span> = <span>$i</span>*<span>$offset</span><span>;
            </span><span>$keywords</span> = Keyword::getWordsSource(selectorItem->cid,<span>$limit</span>,<span>$offset</span><span>);
             </span><span>foreach</span> (<span>$keywords</span> <span>as</span> <span>$val</span><span>) {
                </span><span>#</span><span> code...</span>
                <span>$keywordEntity</span> = SplitterApp::<span>split</span>(<span>$val</span>["word"<span>]);
                
                    </span><span>#</span><span> code...</span>
                <span>if</span>(MacthExector::macth(<span>$keywordEntity</span>,<span>$charlist</span><span>)){
                    </span><span>$selectWords</span>[] = <span>$val</span>["word"<span>];
                }          

            }
        }

        </span><span>return</span> <span>$selectWords</span><span>;
    }

    </span><span>public</span> <span>static</span> <span>function</span> createCharListHandle(<span>$className</span>, <span>$charlist</span>, <span>$selectorItem</span><span>)
    {
        </span><span>if</span> (<span>class_exists</span>(<span>$className</span><span>)) {
            </span><span>return</span> <span>new</span> <span>$className</span>(<span>$charlist</span>, <span>$selectorItem</span><span>);
        }
        </span><span>throw</span> <span>new</span> <span>Exception</span>("class not exists", 0<span>);
    }
}</span>
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帅 Summary

The little handsomeness has learned a new knowledge point. Is this the rhythm of the boss? Do you also want to reward me? Please give me a thumbs up!

The above introduces the in-depth study of the keyword matching project (2) - the introduction of the idea of ​​sub-tables, including aspects of the content. I hope it will be helpful to friends who are interested in PHP tutorials.


Related labels：
database nbsp public return self
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