{"id":3090,"date":"2025-03-22T00:04:01","date_gmt":"2025-03-21T16:04:01","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=3090"},"modified":"2025-03-22T00:04:01","modified_gmt":"2025-03-21T16:04:01","slug":"php-mysql-%e5%88%9b%e5%bb%ba%e6%95%b0%e6%8d%ae%e5%ba%93","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/03\/22\/php-mysql-%e5%88%9b%e5%bb%ba%e6%95%b0%e6%8d%ae%e5%ba%93\/","title":{"rendered":"PHP MySQL \u521b\u5efa\u6570\u636e\u5e93"},"content":{"rendered":"\n<p>\u5728 PHP \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 <strong>MySQLi<\/strong> \u6216 <strong>PDO<\/strong> \u8fde\u63a5 MySQL \u5e76\u521b\u5efa\u6570\u636e\u5e93\u3002\u4ee5\u4e0b\u662f\u8be6\u7ec6\u89e3\u6790\uff0c\u5305\u62ec <strong>\u51fa\u7ad9\u94fe\u63a5<\/strong> \u548c <strong>\u5185\u5bb9\u94fe\u63a5<\/strong>\uff0c\u786e\u4fdd\u5168\u9762\u7406\u89e3\u548c\u5b9e\u8df5\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>1. \u4f7f\u7528 MySQLi \u521b\u5efa\u6570\u636e\u5e93<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1.1 \u8fc7\u7a0b\u5316\u98ce\u683c<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\n$servername = \"localhost\"; \/\/ \u670d\u52a1\u5668\u5730\u5740\n$username = \"root\";        \/\/ MySQL \u7528\u6237\u540d\n$password = \"\";            \/\/ MySQL \u5bc6\u7801\n\n\/\/ \u521b\u5efa\u8fde\u63a5\n$conn = mysqli_connect($servername, $username, $password);\n\n\/\/ \u68c0\u6d4b\u8fde\u63a5\nif (!$conn) {\n    die(\"\u8fde\u63a5\u5931\u8d25: \" . mysqli_connect_error());\n}\n\n\/\/ \u521b\u5efa\u6570\u636e\u5e93 SQL \u8bed\u53e5\n$sql = \"CREATE DATABASE my_database\"; \n\nif (mysqli_query($conn, $sql)) {\n    echo \"\u6570\u636e\u5e93\u521b\u5efa\u6210\u529f\";\n} else {\n    echo \"\u9519\u8bef: \" . mysqli_error($conn);\n}\n\n\/\/ \u5173\u95ed\u8fde\u63a5\nmysqli_close($conn);\n?&gt;<\/code><\/pre>\n\n\n\n<p>\ud83d\udccc <strong>\u89e3\u6790<\/strong>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5148\u8fde\u63a5 MySQL \u670d\u52a1\u5668\uff08<strong>\u4e0d\u6307\u5b9a\u6570\u636e\u5e93<\/strong>\uff09\u3002<\/li>\n\n\n\n<li>\u8fd0\u884c <code>CREATE DATABASE my_database;<\/code> SQL \u8bed\u53e5\u3002<\/li>\n\n\n\n<li>\u5173\u95ed\u8fde\u63a5\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1.2 \u9762\u5411\u5bf9\u8c61\u98ce\u683c<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\n$servername = \"localhost\";\n$username = \"root\";\n$password = \"\";\n\n\/\/ \u521b\u5efa\u8fde\u63a5\n$conn = new mysqli($servername, $username, $password);\n\n\/\/ \u68c0\u6d4b\u8fde\u63a5\nif ($conn-&gt;connect_error) {\n    die(\"\u8fde\u63a5\u5931\u8d25: \" . $conn-&gt;connect_error);\n}\n\n\/\/ \u521b\u5efa\u6570\u636e\u5e93\n$sql = \"CREATE DATABASE my_database\";\nif ($conn-&gt;query($sql) === TRUE) {\n    echo \"\u6570\u636e\u5e93\u521b\u5efa\u6210\u529f\";\n} else {\n    echo \"\u9519\u8bef: \" . $conn-&gt;error;\n}\n\n\/\/ \u5173\u95ed\u8fde\u63a5\n$conn-&gt;close();\n?&gt;<\/code><\/pre>\n\n\n\n<p>\ud83d\udccc <strong>\u9762\u5411\u5bf9\u8c61\u98ce\u683c\u4e0e\u8fc7\u7a0b\u5316\u7684\u533a\u522b<\/strong>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8fc7\u7a0b\u5316\uff1a\u4f7f\u7528 <code>mysqli_connect()<\/code> \u8fdb\u884c\u8fde\u63a5\uff0c\u4f7f\u7528 <code>mysqli_query()<\/code> \u6267\u884c SQL\u3002<\/li>\n\n\n\n<li>\u9762\u5411\u5bf9\u8c61\uff1a\u4f7f\u7528 <code>new mysqli()<\/code> \u8fdb\u884c\u8fde\u63a5\uff0c\u4f7f\u7528 <code>$conn->query()<\/code> \u6267\u884c SQL\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>2. \u4f7f\u7528 PDO \u521b\u5efa\u6570\u636e\u5e93\uff08\u63a8\u8350\uff09<\/strong><\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\n$servername = \"localhost\";\n$username = \"root\";\n$password = \"\";\n\ntry {\n    \/\/ \u8fde\u63a5 MySQL \u670d\u52a1\u5668\n    $pdo = new PDO(\"mysql:host=$servername\", $username, $password);\n    $pdo-&gt;setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);\n\n    \/\/ \u521b\u5efa\u6570\u636e\u5e93\n    $sql = \"CREATE DATABASE my_database\";\n    $pdo-&gt;exec($sql);\n    echo \"\u6570\u636e\u5e93\u521b\u5efa\u6210\u529f\";\n} catch (PDOException $e) {\n    echo \"\u9519\u8bef: \" . $e-&gt;getMessage();\n}\n\n\/\/ \u5173\u95ed\u8fde\u63a5\n$pdo = null;\n?&gt;<\/code><\/pre>\n\n\n\n<p>\ud83d\udccc <strong>PDO \u65b9\u5f0f\u7684\u4f18\u52bf<\/strong>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u652f\u6301\u591a\u79cd\u6570\u636e\u5e93<\/strong>\uff08MySQL\u3001PostgreSQL\u3001SQLite \u7b49\uff09\u3002<\/li>\n\n\n\n<li><strong>\u9ed8\u8ba4\u542f\u7528\u5f02\u5e38\u5904\u7406<\/strong>\uff08<code>PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION<\/code>\uff09\u3002<\/li>\n\n\n\n<li><strong>\u4ee3\u7801\u66f4\u5b89\u5168\u3001\u6269\u5c55\u6027\u66f4\u5f3a<\/strong>\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>3. \u521b\u5efa\u6570\u636e\u5e93\u65f6\u7684\u5e38\u89c1\u9519\u8bef\u4e0e\u89e3\u51b3\u65b9\u6848<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3.1 &#8220;Access denied for user &#8216;root&#8217;@&#8217;localhost'&#8221;<\/strong><\/h3>\n\n\n\n<p><strong>\u9519\u8bef\u539f\u56e0<\/strong>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8d26\u6237\u6216\u5bc6\u7801\u9519\u8bef\u3002<\/li>\n\n\n\n<li>MySQL \u53ef\u80fd\u672a\u6b63\u786e\u542f\u52a8\u3002<\/li>\n\n\n\n<li>\u7528\u6237\u6743\u9650\u4e0d\u8db3\u3002<\/li>\n<\/ul>\n\n\n\n<p><strong>\u89e3\u51b3\u65b9\u6848<\/strong>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u786e\u4fdd MySQL \u5df2\u542f\u52a8\uff1a<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>  systemctl start mysql<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u786e\u4fdd root \u7528\u6237\u6709\u6743\u9650\uff1a<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>  GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY 'your_password';\n  FLUSH PRIVILEGES;<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3.2 &#8220;Unknown database&#8221;<\/strong><\/h3>\n\n\n\n<p><strong>\u9519\u8bef\u539f\u56e0<\/strong>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8fde\u63a5\u65f6\u6307\u5b9a\u4e86\u4e0d\u5b58\u5728\u7684\u6570\u636e\u5e93\u3002<\/li>\n<\/ul>\n\n\n\n<p><strong>\u89e3\u51b3\u65b9\u6848<\/strong>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528 <code>SHOW DATABASES;<\/code> \u67e5\u770b\u6570\u636e\u5e93\u662f\u5426\u5b58\u5728\uff1a<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>  SHOW DATABASES;<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u786e\u4fdd <code>CREATE DATABASE<\/code> \u8bed\u53e5\u62fc\u5199\u6b63\u786e\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3.3 &#8220;Database exists&#8221;<\/strong><\/h3>\n\n\n\n<p><strong>\u9519\u8bef\u539f\u56e0<\/strong>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6570\u636e\u5e93\u5df2\u5b58\u5728\uff0c\u5c1d\u8bd5\u91cd\u590d\u521b\u5efa\u3002<\/li>\n<\/ul>\n\n\n\n<p><strong>\u89e3\u51b3\u65b9\u6848<\/strong>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528 <code>IF NOT EXISTS<\/code> \u907f\u514d\u91cd\u590d\u521b\u5efa\uff1a<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>  $sql = \"CREATE DATABASE IF NOT EXISTS my_database\";<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>4. MySQL \u6570\u636e\u5e93\u7ba1\u7406<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u64cd\u4f5c<\/th><th>SQL \u8bed\u53e5<\/th><\/tr><\/thead><tbody><tr><td>\u521b\u5efa\u6570\u636e\u5e93<\/td><td><code>CREATE DATABASE my_database;<\/code><\/td><\/tr><tr><td>\u5220\u9664\u6570\u636e\u5e93<\/td><td><code>DROP DATABASE my_database;<\/code><\/td><\/tr><tr><td>\u663e\u793a\u6240\u6709\u6570\u636e\u5e93<\/td><td><code>SHOW DATABASES;<\/code><\/td><\/tr><tr><td>\u9009\u62e9\u6570\u636e\u5e93<\/td><td><code>USE my_database;<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\ud83d\udccc <strong>\u63a8\u8350\u53c2\u8003<\/strong>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.php.net\/manual\/en\/book.mysqli.php\">PHP \u5b98\u65b9\u6587\u6863 &#8211; MySQLi<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.php.net\/manual\/en\/book.pdo.php\">PHP \u5b98\u65b9\u6587\u6863 &#8211; PDO<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/dev.mysql.com\/doc\/\">MySQL \u5b98\u65b9\u6587\u6863<\/a><\/li>\n<\/ul>\n\n\n\n<p>\u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 PHP \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 MySQLi \u6216 PDO \u8fde\u63a5 MySQL \u5e76\u521b\u5efa\u6570\u636e\u5e93\u3002\u4ee5\u4e0b\u662f\u8be6\u7ec6\u89e3\u6790\uff0c\u5305\u62ec \u51fa\u7ad9 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3091,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[80],"tags":[],"class_list":["post-3090","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\/3090","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=3090"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3090\/revisions"}],"predecessor-version":[{"id":3092,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3090\/revisions\/3092"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/3091"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=3090"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=3090"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=3090"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}