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<dt style="clear: both; float: left; font-weight: bold; width: 8em">Author</dt>
<dd style="margin-left: 8.5em">Tetsuro IKEDA <ikdtt****@gmail*****></dd>
<dt style="clear: both; float: left; font-weight: bold; width: 8em">Date</dt>
<dd style="margin-left: 8.5em">2010-11-16 18:12:30 +0900 (Tue, 16 Nov 2010)</dd>
<dt style="clear: both; float: left; font-weight: bold; width: 8em">New Revision</dt>
<dd style="margin-left: 8.5em"><a href="https://github.com/mroonga/mroonga/commit/9e60193fdfa61f8b5b3dacc2ce7f6c30ac67a162">9e60193fdfa61f8b5b3dacc2ce7f6c30ac67a162</a></dd>
<dt style="clear: both; float: left; font-weight: bold; width: 8em">Log</dt>
<dd style="margin-left: 8.5em"><pre style="border: 1px solid #aaa; font-family: Consolas, Menlo, "Liberation Mono", Courier, monospace; line-height: 1.2; padding: 0.5em">added docs for _score column.</pre></dd>
<dt style="clear: both; float: left; font-weight: bold; width: 8em">Modified files</dt>
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<li><a href="https://github.com/mroonga/mroonga/commit/9e60193fdfa61f8b5b3dacc2ce7f6c30ac67a162#diff-0">doc/ja/source/userguide.rst</a></li>
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<pre style="border: 0; font-family: Consolas, Menlo, "Liberation Mono", Courier, monospace; line-height: 1.2; margin: 0; padding: 0.5em; white-space: normal"><span class="diff-header" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre"> Modified: doc/ja/source/userguide.rst (+46 -1)</span>
<span class="diff-header-mark" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre">===================================================================</span>
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<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/mroonga/mroonga/commit/9e60193fdfa61f8b5b3dacc2ce7f6c30ac67a162#L0R110">110</a></span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/mroonga/mroonga/commit/9e60193fdfa61f8b5b3dacc2ce7f6c30ac67a162#L0R111">111</a></span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/mroonga/mroonga/commit/9e60193fdfa61f8b5b3dacc2ce7f6c30ac67a162#L0R112">112</a></span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/mroonga/mroonga/commit/9e60193fdfa61f8b5b3dacc2ce7f6c30ac67a162#L0R113">113</a></span>
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<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/mroonga/mroonga/commit/9e60193fdfa61f8b5b3dacc2ce7f6c30ac67a162#L0R115">115</a></span>
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</pre>
</th>
<td class="diff-content" style="border: 1px solid #aaa">
<pre style="border: 0; font-family: Consolas, Menlo, "Liberation Mono", Courier, monospace; line-height: 1.2; margin: 0; padding: 0.5em; white-space: normal"><span class="diff-hunk-header" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre">@@ -42,7 +42,11 @@ <span class="diff-context" style="background-color: #ffffaa; color: #000000">SHOW ENGINESコマンドでgroongaストレージエンジンがインストー</span></span>
<span class="diff-not-changed" style="display: block; white-space: pre"> </span>
<span class="diff-not-changed" style="display: block; white-space: pre"> インストールが確認できたら、テーブルを1つ作成してみましょう。 ::</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> </span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">- mysql> CREATE TABLE t1 (c1 INT PRIMARY KEY, c2 VARCHAR(255), FULLTEXT INDEX (c2)) ENGINE = groonga DEFAULT CHARSET utf8;</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+ mysql> CREATE TABLE t1 (</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+ > c1 INT PRIMARY KEY,</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+ > c2 VARCHAR(255), </span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+ > FULLTEXT INDEX (c2)</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+ > ) ENGINE = groonga DEFAULT CHARSET utf8;</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> Query OK, 0 rows affected (0.22 sec)</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> </span>
<span class="diff-not-changed" style="display: block; white-space: pre"> INSERTでデータを投入してみましょう。 ::</span>
<span class="diff-hunk-header" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre">@@ -66,6 +70,47 @@ <span class="diff-context" style="background-color: #ffffaa; color: #000000">INSERTでデータを投入してみましょう。 ::</span></span>
<span class="diff-not-changed" style="display: block; white-space: pre"> おぉぉー。検索できましたね。</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> </span>
<span class="diff-not-changed" style="display: block; white-space: pre"> </span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+検索スコアの取得方法</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+----------------------------</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+全文検索を行う際、指定したキーワードにより内容が一致するレコードを上位に表示したいというような場合があります。そうしたケースでは検索スコアを利用します。</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+検索スコアを取得するためには、テーブル定義時に ``_score`` という名前のカラムを作成しておく必要があります。 ::</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+ mysql> CREATE TABLE t1 (</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+ > c1 INT PRIMARY KEY,</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+ > c2 TEXT,</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+ > _score FLOAT,</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+ > FULLTEXT INDEX (c2)</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+ > ) ENGINE = groonga DEFAULT CHARSET utf8;</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+ Query OK, 0 rows affected (0.22 sec)</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+_scoreカラムのデータ型はFLOATまたはDOUBLEである必要があります。</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+INSERTでデータを投入してみましょう。_scoreカラムは仮想カラムとして実装されており、更新は行えません。更新対象から外すか、値に ``null`` を使用する必要があります。 ::</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+ mysql> insert into t1 values(1, "aa ii uu ee oo", null);</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+ Query OK, 1 row affected (0.00 sec)</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+ </span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+ mysql> insert into t1 values(2, "aa ii ii ii oo", null);</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+ Query OK, 1 row affected (0.00 sec)</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+ </span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+ mysql> insert into t1 values(3, "dummy", null);</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+ Query OK, 1 row affected (0.00 sec)</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+全文検索(MATCH...AGAINSTによる検索)を実行した場合、_scoreカラムを通じて検索スコアを取得できます。_scoreカラムをORDER BYに指定することで結果のソートも行うことができます。 ::</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+ mysql> select * from t1 where match(c2) against("ii") order by _score desc;</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+ +----+----------------+--------+</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+ | c1 | c2 | _score |</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+ +----+----------------+--------+</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+ | 2 | aa ii ii ii oo | 3 |</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+ | 1 | aa ii uu ee oo | 1 |</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+ +----+----------------+--------+</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+ 2 rows in set (0.00 sec)</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> ログ出力</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> ----------------------------</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> </span>
</pre>
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