How to use full-text search and indexing techniques of Oracle database in PHP

How to use the full-text search and indexing skills of Oracle database in PHP

Overview:
With the rapid development of the information age, the amount of data is increasing, how to perform data search efficiently has become An important question. Full-text search technology can return the required information more accurately and quickly, so it is receiving more and more attention in practical applications. In PHP development, we often use Oracle database to store data. This article will introduce how to use the full-text search and indexing skills of Oracle database in PHP, and provide code examples.

Step 1: Initialize the Oracle database
Before using the Oracle database, you need to ensure that the Oracle database service has been correctly installed and started. The PDO library is often used to connect to the Oracle database in PHP, and the OCI extension of PDO is used to operate the Oracle database.

//连接Oracle数据库
$tns = "(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521))(CONNECT_DATA=(SID=ORCL)))";
$username = "username";
$password = "password";

try {
    $conn = new PDO("oci:dbname=".$tns, $username, $password);
} catch (PDOException $e) {
    die("连接Oracle数据库失败: ".$e->getMessage());
}

//设置字符集
$conn->exec("set names utf8");

Step 2: Create a full-text search index
Before performing a full-text search, you need to create a full-text index on the table to be searched. Oracle database provides a full-text search function, which can create a full-text index for search fields to improve search efficiency. To create a full-text index, you can use the functions provided by Oracle's built-in CTXSYS package.

//创建全文搜索索引
$stmt = $conn->prepare("BEGIN ctx_ddl.create_preference('my_lexer', 'CHINESE_VGRAM_LEXER'); END;");
$stmt->execute();

$stmt = $conn->prepare("CREATE INDEX my_index ON my_table(my_column) INDEXTYPE IS ctxsys.context PARAMETERS ('DATASTORE CTXSYS.DEFAULT_DATASTORE LEXER my_lexer')");
$stmt->execute();

Step 3: Execute full-text search query
After completing the creation of the full-text index, we can use SQL statements to perform full-text search queries. Oracle database provides query syntax for full-text search, which can be searched through the MATCH and AGAINST keywords.

//执行全文搜索查询
$keyword = "PHP";

$stmt = $conn->prepare("SELECT * FROM my_table WHERE CONTAINS(my_column, :keyword) > 0");
$stmt->bindParam(':keyword', $keyword);
$stmt->execute();

$results = $stmt->fetchAll(PDO::FETCH_ASSOC);

Step 4: Display search results
After executing the full-text search query, the search results can be displayed. In PHP, you can use HTML and CSS to beautify the display of search results.

//展示搜索结果
echo "<table>";
echo "<tr><th>标题</th><th>作者</th></tr>";

foreach ($results as $row) {
    echo "<tr>";
    echo "<td>".$row['title']."</td>";
    echo "<td>".$row['author']."</td>";
    echo "</tr>";
}

echo "</table>";

Summary:
This article introduces how to use the full-text search and indexing skills of Oracle database in PHP. By creating a full-text index and executing full-text search queries, it can be performed more accurately and quickly in practical applications. Data search. I hope that through the introduction of this article, readers will have an understanding of full-text search using Oracle database and be able to use it flexibly in actual development.

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