{"id":3105,"date":"2025-03-22T00:10:56","date_gmt":"2025-03-21T16:10:56","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=3105"},"modified":"2025-03-22T00:10:56","modified_gmt":"2025-03-21T16:10:56","slug":"php-mysql-%e8%af%bb%e5%8f%96%e6%95%b0%e6%8d%ae","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/03\/22\/php-mysql-%e8%af%bb%e5%8f%96%e6%95%b0%e6%8d%ae\/","title":{"rendered":"PHP MySQL \u8bfb\u53d6\u6570\u636e"},"content":{"rendered":"\n

\u5728 PHP \u4e2d\u8bfb\u53d6 MySQL \u6570\u636e\u53ef\u4ee5\u4f7f\u7528 MySQLi \u6216 PDO \u4e24\u79cd\u65b9\u5f0f\u3002\u8bfb\u53d6\u6570\u636e\u901a\u5e38\u662f\u901a\u8fc7 SELECT<\/strong> \u8bed\u53e5\u6765\u4ece\u6570\u636e\u5e93\u4e2d\u83b7\u53d6\u4fe1\u606f\uff0c\u7136\u540e\u663e\u793a\u6216\u8fdb\u4e00\u6b65\u5904\u7406\u3002<\/p>\n\n\n\n

\u4ee5\u4e0b\u662f\u4f7f\u7528 MySQLi<\/strong> \u548c PDO<\/strong> \u8bfb\u53d6\u6570\u636e\u7684\u8be6\u7ec6\u793a\u4f8b\u3002<\/p>\n\n\n\n

\n\n\n\n

1. \u4f7f\u7528 MySQLi \u8bfb\u53d6\u6570\u636e<\/strong><\/h2>\n\n\n\n

1.1 \u4f7f\u7528\u9762\u5411\u5bf9\u8c61\u65b9\u5f0f<\/strong><\/h3>\n\n\n\n
<?php\n$servername = \"localhost\";\n$username = \"root\";\n$password = \"\";\n$dbname = \"my_database\";\n\n\/\/ \u521b\u5efa\u8fde\u63a5\n$conn = new mysqli($servername, $username, $password, $dbname);\n\n\/\/ \u68c0\u67e5\u8fde\u63a5\nif ($conn->connect_error) {\n    die(\"\u8fde\u63a5\u5931\u8d25: \" . $conn->connect_error);\n}\n\n\/\/ \u6267\u884c\u67e5\u8be2\n$sql = \"SELECT id, username, email FROM users\";\n$result = $conn->query($sql);\n\n\/\/ \u68c0\u67e5\u7ed3\u679c\nif ($result->num_rows > 0) {\n    \/\/ \u8f93\u51fa\u6bcf\u4e00\u884c\u6570\u636e\n    while($row = $result->fetch_assoc()) {\n        echo \"ID: \" . $row[\"id\"]. \" - \u7528\u6237\u540d: \" . $row[\"username\"]. \" - \u90ae\u7bb1: \" . $row[\"email\"]. \"<br>\";\n    }\n} else {\n    echo \"\u6ca1\u6709\u6570\u636e\";\n}\n\n\/\/ \u5173\u95ed\u8fde\u63a5\n$conn->close();\n?><\/code><\/pre>\n\n\n\n
\ud83d\udccc \u89e3\u6790<\/strong>\uff1a<\/p>\n\n\n\n
    \n
  • $conn->query($sql)<\/code><\/strong>\uff1a\u6267\u884c SQL \u67e5\u8be2\uff0c\u8fd4\u56de\u4e00\u4e2a\u7ed3\u679c\u96c6\u3002<\/li>\n\n\n\n
  • $result->num_rows<\/code><\/strong>\uff1a\u68c0\u67e5\u67e5\u8be2\u7ed3\u679c\u662f\u5426\u6709\u6570\u636e\u3002<\/li>\n\n\n\n
  • $result->fetch_assoc()<\/code><\/strong>\uff1a\u6309\u884c\u83b7\u53d6\u6570\u636e\u5e76\u8fd4\u56de\u5173\u8054\u6570\u7ec4\u3002<\/li>\n<\/ul>\n\n\n\n
    1.2 \u4f7f\u7528\u8fc7\u7a0b\u5316\u65b9\u5f0f<\/strong><\/h3>\n\n\n\n
    <?php\n$servername = \"localhost\";\n$username = \"root\";\n$password = \"\";\n$dbname = \"my_database\";\n\n\/\/ \u521b\u5efa\u8fde\u63a5\n$conn = mysqli_connect($servername, $username, $password, $dbname);\n\n\/\/ \u68c0\u67e5\u8fde\u63a5\nif (!$conn) {\n    die(\"\u8fde\u63a5\u5931\u8d25: \" . mysqli_connect_error());\n}\n\n\/\/ \u6267\u884c\u67e5\u8be2\n$sql = \"SELECT id, username, email FROM users\";\n$result = mysqli_query($conn, $sql);\n\n\/\/ \u68c0\u67e5\u7ed3\u679c\nif (mysqli_num_rows($result) > 0) {\n    \/\/ \u8f93\u51fa\u6bcf\u4e00\u884c\u6570\u636e\n    while($row = mysqli_fetch_assoc($result)) {\n        echo \"ID: \" . $row[\"id\"]. \" - \u7528\u6237\u540d: \" . $row[\"username\"]. \" - \u90ae\u7bb1: \" . $row[\"email\"]. \"<br>\";\n    }\n} else {\n    echo \"\u6ca1\u6709\u6570\u636e\";\n}\n\n\/\/ \u5173\u95ed\u8fde\u63a5\nmysqli_close($conn);\n?><\/code><\/pre>\n\n\n\n
    \ud83d\udccc \u89e3\u6790<\/strong>\uff1a<\/p>\n\n\n\n
      \n
    • mysqli_query($conn, $sql)<\/code><\/strong>\uff1a\u6267\u884c\u67e5\u8be2\uff0c\u8fd4\u56de\u7ed3\u679c\u96c6\u3002<\/li>\n\n\n\n
    • mysqli_num_rows($result)<\/code><\/strong>\uff1a\u68c0\u67e5\u7ed3\u679c\u96c6\u4e2d\u7684\u884c\u6570\u3002<\/li>\n\n\n\n
    • mysqli_fetch_assoc($result)<\/code><\/strong>\uff1a\u6309\u884c\u8fd4\u56de\u5173\u8054\u6570\u7ec4\u3002<\/li>\n<\/ul>\n\n\n\n
      \n\n\n\n
      2. \u4f7f\u7528 PDO \u8bfb\u53d6\u6570\u636e<\/strong><\/h2>\n\n\n\n
      PDO \u63d0\u4f9b\u4e86\u4e00\u79cd\u66f4\u52a0\u7075\u6d3b\u548c\u5b89\u5168\u7684\u65b9\u5f0f\u6765\u8fde\u63a5\u548c\u64cd\u4f5c\u6570\u636e\u5e93\u3002\u5b83\u652f\u6301\u591a\u79cd\u6570\u636e\u5e93\u7c7b\u578b\uff0c\u53ef\u4ee5\u7b80\u5316\u8de8\u5e73\u53f0\u5f00\u53d1\u3002<\/p>\n\n\n\n
      2.1 \u4f7f\u7528 PDO \u8bfb\u53d6\u6570\u636e<\/strong><\/h3>\n\n\n\n
      <?php\n$servername = \"localhost\";\n$username = \"root\";\n$password = \"\";\n$dbname = \"my_database\";\n\ntry {\n    \/\/ \u521b\u5efa PDO \u8fde\u63a5\n    $pdo = new PDO(\"mysql:host=$servername;dbname=$dbname\", $username, $password);\n    \/\/ \u8bbe\u7f6e\u9519\u8bef\u6a21\u5f0f\n    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);\n\n    \/\/ \u6267\u884c\u67e5\u8be2\n    $sql = \"SELECT id, username, email FROM users\";\n    $stmt = $pdo->query($sql);\n\n    \/\/ \u68c0\u67e5\u7ed3\u679c\n    if ($stmt->rowCount() > 0) {\n        \/\/ \u8f93\u51fa\u6bcf\u4e00\u884c\u6570\u636e\n        while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {\n            echo \"ID: \" . $row['id'] . \" - \u7528\u6237\u540d: \" . $row['username'] . \" - \u90ae\u7bb1: \" . $row['email'] . \"<br>\";\n        }\n    } else {\n        echo \"\u6ca1\u6709\u6570\u636e\";\n    }\n} catch (PDOException $e) {\n    echo \"\u9519\u8bef: \" . $e->getMessage();\n}\n\n\/\/ \u5173\u95ed\u8fde\u63a5\n$pdo = null;\n?><\/code><\/pre>\n\n\n\n
      \ud83d\udccc \u89e3\u6790<\/strong>\uff1a<\/p>\n\n\n\n
        \n
      • $pdo->query($sql)<\/code><\/strong>\uff1a\u6267\u884c SQL \u67e5\u8be2\u5e76\u8fd4\u56de\u4e00\u4e2a PDOStatement \u5bf9\u8c61\u3002<\/li>\n\n\n\n
      • $stmt->rowCount()<\/code><\/strong>\uff1a\u68c0\u67e5\u7ed3\u679c\u96c6\u7684\u884c\u6570\u3002<\/li>\n\n\n\n
      • $stmt->fetch(PDO::FETCH_ASSOC)<\/code><\/strong>\uff1a\u6309\u884c\u8fd4\u56de\u5173\u8054\u6570\u7ec4\u3002<\/li>\n<\/ul>\n\n\n\n
        \n\n\n\n
        3. \u8bfb\u53d6\u6570\u636e\u65f6\u7684\u5e38\u89c1\u95ee\u9898\u4e0e\u6ce8\u610f\u4e8b\u9879<\/strong><\/h2>\n\n\n\n
        3.1 SQL \u67e5\u8be2\u7ed3\u679c\u4e3a\u7a7a<\/strong><\/h3>\n\n\n\n
          \n
        • \u95ee\u9898<\/strong>\uff1a\u5982\u679c\u67e5\u8be2\u6ca1\u6709\u627e\u5230\u4efb\u4f55\u6570\u636e\uff0c\u53ef\u80fd\u4f1a\u8fd4\u56de\u7a7a\u7ed3\u679c\u96c6\u3002<\/li>\n\n\n\n
        • \u89e3\u51b3\u65b9\u6cd5<\/strong>\uff1a\u68c0\u67e5 num_rows<\/code> \u6216 rowCount()<\/code>\uff0c\u5e76\u6839\u636e\u9700\u8981\u8f93\u51fa\u201c\u6ca1\u6709\u6570\u636e\u201d\u6216\u5904\u7406\u7a7a\u7ed3\u679c\u7684\u903b\u8f91\u3002<\/li>\n<\/ul>\n\n\n\n
          3.2 \u9632\u6b62 SQL \u6ce8\u5165<\/strong><\/h3>\n\n\n\n
            \n
          • \u5982\u679c\u67e5\u8be2\u4e2d\u5305\u542b\u7528\u6237\u8f93\u5165\uff08\u5982\u7528\u6237\u540d\u6216\u90ae\u7bb1\uff09\uff0c\u8981\u4f7f\u7528\u9884\u5904\u7406\u8bed\u53e5\u6765\u9632\u6b62 SQL \u6ce8\u5165\u3002\u4f7f\u7528 \u9884\u5904\u7406\u8bed\u53e5<\/strong> \u7ed1\u5b9a\u53c2\u6570\u662f\u6700\u5b89\u5168\u7684\u65b9\u6cd5\u3002<\/li>\n<\/ul>\n\n\n\n
            3.3 \u7ed1\u5b9a\u53c2\u6570<\/strong><\/h3>\n\n\n\n
              \n
            • \u5728\u4f7f\u7528\u9884\u5904\u7406\u8bed\u53e5\u65f6\uff0c\u786e\u4fdd\u7ed1\u5b9a\u6b63\u786e\u7684\u6570\u636e\u7c7b\u578b\u53c2\u6570\uff0c\u5c24\u5176\u662f\u5b57\u7b26\u4e32\u3001\u6574\u6570\u548c\u5e03\u5c14\u503c\u3002<\/li>\n<\/ul>\n\n\n\n
              3.4 \u5206\u9875\u67e5\u8be2<\/strong><\/h3>\n\n\n\n
              \u5f53\u67e5\u8be2\u7ed3\u679c\u8fc7\u591a\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528 LIMIT<\/strong> \u6765\u9650\u5236\u8fd4\u56de\u7684\u8bb0\u5f55\u6570\uff0c\u4ece\u800c\u5b9e\u73b0\u5206\u9875\u529f\u80fd\u3002<\/p>\n\n\n\n
              $sql = \"SELECT id, username, email FROM users LIMIT 10 OFFSET 0\"; \/\/ \u83b7\u53d6\u524d 10 \u6761\u8bb0\u5f55<\/code><\/pre>\n\n\n\n
                \n
              • LIMIT<\/code> \u6307\u5b9a\u4e86\u8fd4\u56de\u8bb0\u5f55\u7684\u6570\u91cf\u3002<\/li>\n\n\n\n
              • OFFSET<\/code> \u6307\u5b9a\u4e86\u67e5\u8be2\u7684\u8d77\u59cb\u4f4d\u7f6e\u3002<\/li>\n<\/ul>\n\n\n\n
                \n\n\n\n
                \u603b\u7ed3<\/strong><\/h2>\n\n\n\n
                \u65b9\u6cd5<\/strong><\/th>\u8fde\u63a5\u7c7b\u578b<\/strong><\/th>\u5b89\u5168\u6027<\/strong><\/th>\u6027\u80fd<\/strong><\/th><\/tr><\/thead>
                MySQLi<\/strong><\/td>\u9762\u5411\u5bf9\u8c61\u3001\u8fc7\u7a0b\u5316<\/td>\u9ad8<\/td>\u9ad8<\/td><\/tr>
                PDO<\/strong><\/td>\u9762\u5411\u5bf9\u8c61<\/td>\u9ad8<\/td>\u9ad8<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
                \u65e0\u8bba\u662f MySQLi \u8fd8\u662f PDO\uff0c\u8bfb\u53d6\u6570\u636e\u7684\u8fc7\u7a0b\u90fd\u975e\u5e38\u76f8\u4f3c\u3002\u6700\u91cd\u8981\u7684\u662f\u4f7f\u7528 \u9884\u5904\u7406\u8bed\u53e5<\/strong> \u6765\u9632\u6b62 SQL \u6ce8\u5165\uff0c\u786e\u4fdd\u6570\u636e\u5b89\u5168\u3002\u5982\u679c\u4f60\u5728\u9009\u62e9\u6570\u636e\u5e93\u9a71\u52a8\u65f6\u6ca1\u6709\u660e\u786e\u7684\u504f\u597d\uff0cPDO \u63d0\u4f9b\u4e86\u66f4\u5e7f\u6cdb\u7684\u6570\u636e\u5e93\u652f\u6301\uff0c\u9002\u5408\u8de8\u5e73\u53f0\u5f00\u53d1\u3002<\/p>\n\n\n\n
                \u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
                \u5728 PHP \u4e2d\u8bfb\u53d6 MySQL \u6570\u636e\u53ef\u4ee5\u4f7f\u7528 MySQLi \u6216 PDO \u4e24\u79cd\u65b9\u5f0f\u3002\u8bfb\u53d6\u6570\u636e\u901a\u5e38\u662f\u901a\u8fc7 SELE […]<\/p>\n","protected":false},"author":1,"featured_media":3106,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[80],"tags":[],"class_list":["post-3105","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-php"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3105","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=3105"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3105\/revisions"}],"predecessor-version":[{"id":3107,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3105\/revisions\/3107"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/3106"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=3105"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=3105"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=3105"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}