{"id":295432,"date":"2024-05-20T15:35:43","date_gmt":"2024-05-20T07:35:43","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/295432.html"},"modified":"2024-05-20T15:35:54","modified_gmt":"2024-05-20T07:35:54","slug":"python-%e7%a8%8b%e5%ba%8f%e5%a6%82%e4%bd%95%e5%ae%9e%e7%8e%b0%e8%bf%9e%e6%8e%a5%e6%b1%a0","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/295432.html","title":{"rendered":"python \u7a0b\u5e8f\u5982\u4f55\u5b9e\u73b0\u8fde\u63a5\u6c60"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/27142742\/6c7640ad-13eb-41ee-ba67-e3f586f85897.webp\" alt=\"python \u7a0b\u5e8f\u5982\u4f55\u5b9e\u73b0\u8fde\u63a5\u6c60\" \/><\/p>\n<p><p>\u5728Python\u4e2d\u5b9e\u73b0\u8fde\u63a5\u6c60\u4e3b\u8981\u6d89\u53ca\u5230\u4e09\u4e2a\u91cd\u8981\u7684\u6982\u5ff5\uff1a<strong>\u51cf\u5c11\u6570\u636e\u5e93\u8fde\u63a5\u7684\u5f00\u9500\u3001\u7ba1\u7406\u6570\u636e\u5e93\u8fde\u63a5\u3001\u91cd\u7528\u6570\u636e\u5e93\u8fde\u63a5<\/strong>\u3002\u5f53\u5f00\u53d1\u8005\u9762\u4e34\u9891\u7e41\u7684\u6570\u636e\u5e93\u64cd\u4f5c\u65f6\uff0c\u6bcf\u6b21\u64cd\u4f5c\u90fd\u65b0\u5efa\u8fde\u63a5\u4f1a\u9020\u6210\u5f88\u5927\u7684\u6027\u80fd\u6d88\u8017\uff0c\u800c\u8fde\u63a5\u6c60\u6280\u672f\u6070\u6070\u80fd\u591f\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u3002\u5b83\u7ef4\u62a4\u7740\u4e00\u6c60\u56fa\u5b9a\u6570\u91cf\u7684\u6570\u636e\u5e93\u8fde\u63a5\uff0c\u7a0b\u5e8f\u9700\u8981\u8fdb\u884c\u6570\u636e\u5e93\u64cd\u4f5c\u65f6\uff0c\u76f4\u63a5\u4ece\u6c60\u4e2d\u53d6\u51fa\u4e00\u4e2a\u73b0\u6210\u7684\u8fde\u63a5\uff0c\u64cd\u4f5c\u5b8c\u6210\u540e\u518d\u653e\u56de\u6c60\u4e2d\uff0c\u5b9e\u73b0\u8fde\u63a5\u7684\u590d\u7528\u3002<strong>\u8fde\u63a5\u6c60\u7684\u8fd0\u4f5c\u964d\u4f4e\u4e86\u8fde\u63a5\u6570\u636e\u5e93\u7684\u9891\u7e41\u5f00\u9500\uff0c\u63d0\u9ad8\u4e86\u8d44\u6e90\u7684\u5229\u7528\u7387<\/strong>\u3002\u4e0b\u9762\uff0c\u6211\u4eec\u5c06\u4f1a\u8be6\u7ec6\u5730\u63a2\u7d22\u5982\u4f55\u5728Python\u7a0b\u5e8f\u4e2d\u5b9e\u73b0\u8fde\u63a5\u6c60\u3002<\/p>\n<\/p>\n<p><h3>\u4e00\u3001\u7406\u89e3\u8fde\u63a5\u6c60\u7684\u91cd\u8981\u6027<\/h3>\n<\/p>\n<p><p>\u6570\u636e\u5e93\u8fde\u63a5\u662f\u4e00\u79cd\u91cd\u8981\u7684\u8d44\u6e90\uff0c\u4f46\u5b83\u4eec\u4e5f\u662f\u6709\u9650\u4e14\u6210\u672c\u8f83\u9ad8\u7684\u3002\u9891\u7e41\u5730\u521b\u5efa\u548c\u9500\u6bc1\u8fde\u63a5\uff0c\u4e0d\u4ec5\u6d88\u8017\u7cfb\u7edf\u8d44\u6e90\uff0c\u800c\u4e14\u4f1a\u964d\u4f4e\u5e94\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u3002\u5229\u7528\u8fde\u63a5\u6c60\u53ef\u4ee5\u5b9e\u73b0\u8fde\u63a5\u7684\u590d\u7528\u3001\u5e73\u6ed1\u7684\u6027\u80fd\u5cf0\u503c\u3001\u63d0\u9ad8\u7a0b\u5e8f\u7a33\u5b9a\u6027\u4ee5\u53ca\u63a7\u5236\u8fde\u63a5\u6570\u91cf\u3002<\/p>\n<\/p>\n<p><h3>\u4e8c\u3001\u9009\u62e9\u8fde\u63a5\u6c60\u7684\u5b9e\u73b0\u65b9\u5f0f<\/h3>\n<\/p>\n<p><h4>SQLAlchemy<\/h4>\n<\/p>\n<p><p>SQLAlchemy\u662fPython\u4e2d\u975e\u5e38\u6d41\u884c\u7684SQL\u5de5\u5177\u5305\u548c\u5bf9\u8c61\u5173\u7cfb\u6620\u5c04\uff08ORM\uff09\u5de5\u5177\u3002\u5b83\u63d0\u4f9b\u4e86\u4e00\u4e2a\u5f3a\u5927\u7684\u8fde\u63a5\u6c60\u529f\u80fd\uff0c\u53ef\u4ee5\u901a\u8fc7\u5982\u4e0b\u6b65\u9aa4\u5b9e\u73b0\uff1a<\/p>\n<\/p>\n<ol>\n<li>\u5bfc\u5165SQLAlchemy\u6a21\u5757\uff1a<\/li>\n<\/ol>\n<p><pre><code class=\"language-python\">from sqlalchemy import create_engine<\/p>\n<p><\/code><\/pre>\n<\/p>\n<ol start=\"2\">\n<li>\u5229\u7528<code>create_engine<\/code>\u51fd\u6570\u521b\u5efa\u4e00\u4e2a\u65b0\u7684<code>Engine<\/code>\u5b9e\u4f8b\uff1a<\/li>\n<\/ol>\n<p><pre><code class=\"language-python\">engine = create_engine(&#039;\u6570\u636e\u5e93\u8fde\u63a5URL&#039;, pool_size=10, max_overflow=20)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p><strong>\u8fd9\u91cc\u7684<code>pool_size<\/code>\u53c2\u6570\u5b9a\u4e49\u4e86\u8fde\u63a5\u6c60\u4e2d\u7684\u8fde\u63a5\u6570<\/strong>\uff0c<code>max_overflow<\/code>\u5b9a\u4e49\u4e86\u8d85\u8fc7\u8fde\u63a5\u6c60\u5927\u5c0f\u65f6\uff0c\u5141\u8bb8\u521b\u5efa\u7684\u6700\u5927\u8fde\u63a5\u6570\u3002<\/p>\n<\/p>\n<p><h4>DBUtils<\/h4>\n<\/p>\n<p><p>DBUtils\u662f\u4e00\u4e2aPython\u5305\uff0c\u63d0\u4f9b\u4e86\u5bf9\u4e0d\u540c\u6570\u636e\u5e93\u7684\u8fde\u63a5\u6c60\u652f\u6301\u3002\u6bd4\u5982PersistentDB\u8fde\u63a5\u6c60\uff1a<\/p>\n<\/p>\n<ol>\n<li>\u5bfc\u5165\u6a21\u5757\uff1a<\/li>\n<\/ol>\n<p><pre><code class=\"language-python\">from DBUtils.PersistentDB import PersistentDB<\/p>\n<p>import MySQLdb<\/p>\n<p><\/code><\/pre>\n<\/p>\n<ol start=\"2\">\n<li>\u521b\u5efaPersistentDB\u5b9e\u4f8b\uff1a<\/li>\n<\/ol>\n<p><pre><code class=\"language-python\">pool = PersistentDB(MySQLdb, host=&#039;localhost&#039;, user=&#039;username&#039;, passwd=&#039;password&#039;, db=&#039;mydb&#039;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p><strong><code>PersistentDB<\/code>\u521b\u5efa\u4e86\u4e00\u4e2a\u7ebf\u7a0b\u6301\u4e45\u7684\u6570\u636e\u5e93\u8fde\u63a5\u6c60<\/strong>\uff0c\u5f53\u7ebf\u7a0b\u7b2c\u4e00\u6b21\u8c03\u7528<code>connection()<\/code>\u65f6\uff0c\u5b83\u521b\u5efa\u4e00\u4e2a\u8fde\u63a5\uff0c\u5e76\u5728\u4e4b\u540e\u7684\u8c03\u7528\u4e2d\u91cd\u65b0\u4f7f\u7528\u5b83\u4eec\u3002<\/p>\n<\/p>\n<p><h3>\u4e09\u3001\u5b9e\u73b0\u4e00\u4e2a\u81ea\u5b9a\u4e49\u7684\u8fde\u63a5\u6c60<\/h3>\n<\/p>\n<p><p>\u867d\u7136\u4f7f\u7528\u73b0\u6709\u7684\u5e93\u53ef\u4ee5\u5feb\u901f\u5b9e\u73b0\u8fde\u63a5\u6c60\uff0c\u4f46\u4e86\u89e3\u5176\u80cc\u540e\u7684\u539f\u7406\u4e5f\u5341\u5206\u91cd\u8981\u3002\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u6b65\u9aa4\u5b9e\u73b0\u81ea\u5b9a\u4e49\u8fde\u63a5\u6c60\uff1a<\/p>\n<\/p>\n<ol>\n<li>\u521b\u5efa\u8fde\u63a5\u6c60\u7c7b\u5e76\u521d\u59cb\u5316\u57fa\u7840\u53c2\u6570\uff1a<\/li>\n<\/ol>\n<p><pre><code class=\"language-python\">class SimpleConnectionPool:<\/p>\n<p>    def __init__(self, size, connection_factory):<\/p>\n<p>        self._size = size<\/p>\n<p>        self._connection_factory = connection_factory<\/p>\n<p>        self._pool = []<\/p>\n<p>        # \u521d\u59cb\u5316\u8fde\u63a5\u6c60<\/p>\n<p>        for _ in range(size):<\/p>\n<p>            self._pool.append(self._create_new_connection())<\/p>\n<p>    def _create_new_connection(self):<\/p>\n<p>        return self._connection_factory()<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p><strong>\u8fd9\u4e2a\u7c7b\u5305\u542b\u4e86\u57fa\u672c\u7684\u8fde\u63a5\u6c60\u7ed3\u6784<\/strong>\uff0c<code>_create_new_connection<\/code>\u662f\u7528\u6765\u521b\u5efa\u65b0\u8fde\u63a5\u7684\u65b9\u6cd5\u3002<\/p>\n<\/p>\n<ol start=\"2\">\n<li>\u5b9e\u73b0\u83b7\u53d6\u548c\u8fd4\u56de\u8fde\u63a5\u7684\u65b9\u6cd5\uff1a<\/li>\n<\/ol>\n<p><pre><code class=\"language-python\">def get_connection(self):<\/p>\n<p>    if not self._pool:<\/p>\n<p>        r<a href=\"https:\/\/docs.pingcode.com\/blog\/59162.html\" target=\"_blank\">AI<\/a>se Exception(&quot;No connections available&quot;)<\/p>\n<p>    return self._pool.pop()<\/p>\n<p>def return_connection(self, connection):<\/p>\n<p>    if len(self._pool) &lt; self._size:<\/p>\n<p>        self._pool.append(connection)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p><strong><code>get_connection<\/code>\u65b9\u6cd5\u7528\u4e8e\u4ece\u6c60\u4e2d\u53d6\u51fa\u8fde\u63a5\uff0c\u800c<code>return_connection<\/code>\u7528\u6765\u8fd4\u56de\u8fde\u63a5\u5230\u6c60\u4e2d\u3002<\/strong><\/p>\n<\/p>\n<p><h3>\u56db\u3001\u7ba1\u7406\u8fde\u63a5\u6c60\u4e2d\u7684\u8fde\u63a5<\/h3>\n<\/p>\n<p><p>\u5bf9\u4e8e\u8fde\u63a5\u6c60\u7684\u7ba1\u7406\uff0c\u91cd\u8981\u7684\u662f\u76d1\u63a7\u5b83\u7684\u72b6\u6001\u548c\u5bf9\u8fde\u63a5\u7684\u751f\u547d\u5468\u671f\u8fdb\u884c\u7ba1\u7406\u3002<\/p>\n<\/p>\n<ol>\n<li>\u5728<code>SimpleConnectionPool<\/code>\u4e2d\u589e\u52a0\u72b6\u6001\u76d1\u63a7\u548c\u8fde\u63a5\u68c0\u6d4b\uff1a<\/li>\n<\/ol>\n<p><pre><code class=\"language-python\">def _validate_connection(self, connection):<\/p>\n<p>    # \u8fd9\u91cc\u6dfb\u52a0\u5bf9\u8fde\u63a5\u6709\u6548\u6027\u7684\u68c0\u67e5\u903b\u8f91<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p><strong>\u901a\u8fc7<code>_validate_connection<\/code>\u68c0\u67e5\u8fde\u63a5\u7684\u6709\u6548\u6027\uff0c\u786e\u4fdd\u4ece\u6c60\u4e2d\u53d6\u51fa\u7684\u662f\u53ef\u7528\u8fde\u63a5\u3002<\/strong><\/p>\n<\/p>\n<ol start=\"2\">\n<li>\u5904\u7406\u8fde\u63a5\u6c60\u4e2d\u4e0d\u518d\u6709\u6548\u7684\u8fde\u63a5\uff1a<\/li>\n<\/ol>\n<p><pre><code class=\"language-python\">def _cleanup(self, connection):<\/p>\n<p>    # \u8fd9\u91cc\u6dfb\u52a0\u6e05\u7406\u4e0d\u518d\u6709\u6548\u8fde\u63a5\u7684\u903b\u8f91<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p><strong><code>_cleanup<\/code>\u8d1f\u8d23\u5904\u7406\u548c\u56de\u6536\u90a3\u4e9b\u4e0d\u518d\u6709\u6548\u7684\u8fde\u63a5\u3002<\/strong><\/p>\n<\/p>\n<p><h3>\u4e94\u3001\u9762\u5bf9\u5e76\u53d1\u7684\u6311\u6218<\/h3>\n<\/p>\n<p><p>\u5f53\u7a0b\u5e8f\u9700\u8981\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d\u5de5\u4f5c\u65f6\uff0c\u8fde\u63a5\u6c60\u7684\u7ebf\u7a0b\u5b89\u5168\u6027\u53d8\u5f97\u5c24\u4e3a\u91cd\u8981\u3002\u53ef\u4ee5\u901a\u8fc7\u52a0\u9501\u6765\u4fdd\u6301\u7ebf\u7a0b\u5b89\u5168\uff1a<\/p>\n<\/p>\n<ol>\n<li>\u5f15\u5165\u7ebf\u7a0b\u9501\uff1a<\/li>\n<\/ol>\n<p><pre><code class=\"language-python\">from threading import Lock<\/p>\n<p><\/code><\/pre>\n<\/p>\n<ol start=\"2\">\n<li>\u5728<code>SimpleConnectionPool<\/code>\u4e2d\u4f7f\u7528\u9501\uff1a<\/li>\n<\/ol>\n<p><pre><code class=\"language-python\">def __init__(self, size, connection_factory):<\/p>\n<p>    # ...<\/p>\n<p>    self._lock = Lock()<\/p>\n<p>def get_connection(self):<\/p>\n<p>    with self._lock:<\/p>\n<p>        # \u52a0\u9501\u903b\u8f91<\/p>\n<p>        return super().get_connection()<\/p>\n<p>def return_connection(self, connection):<\/p>\n<p>    with self._lock:<\/p>\n<p>        # \u52a0\u9501\u903b\u8f91<\/p>\n<p>        super().return_connection(connection)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p><strong>\u4f7f\u7528\u9501\u6765\u540c\u6b65\u7ebf\u7a0b\uff0c\u9632\u6b62\u591a\u7ebf\u7a0b\u540c\u65f6\u64cd\u4f5c\u8fde\u63a5\u6c60\u8d44\u6e90\u3002<\/strong><\/p>\n<\/p>\n<p><p>\u901a\u8fc7\u4e0a\u8ff0\u6b65\u9aa4\uff0c\u60a8\u53ef\u4ee5\u5728Python\u7a0b\u5e8f\u4e2d\u5b9e\u73b0\u4e00\u4e2a\u9ad8\u6548\u3001\u5b89\u5168\u7684\u8fde\u63a5\u6c60\u673a\u5236\u3002\u65e0\u8bba\u662f\u4f9d\u8d56\u7b2c\u4e09\u65b9\u5e93\u8fd8\u662f\u81ea\u5b9a\u4e49\u5b9e\u73b0\uff0c\u8fde\u63a5\u6c60\u90fd\u662f\u4f18\u5316\u6570\u636e\u5e93\u6027\u80fd\u548c\u8d44\u6e90\u5229\u7528\u7684\u91cd\u8981\u5de5\u5177\u3002\u4e0d\u8fc7\u9700\u8981\u6ce8\u610f\uff0c\u4e0d\u5f53\u7684\u4f7f\u7528\u6216\u7ba1\u7406\u8fde\u63a5\u6c60\u53ef\u80fd\u4f1a\u5f15\u8d77\u8d44\u6e90\u6cc4\u9732\u3001\u6027\u80fd\u74f6\u9888\u7b49\u95ee\u9898\uff0c\u56e0\u6b64\u52a1\u5fc5\u5728\u7406\u89e3\u539f\u7406\u7684\u57fa\u7840\u4e0a\u8c28\u614e\u5b9e\u65bd\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p><strong>1. \u4ec0\u4e48\u662f\u8fde\u63a5\u6c60\uff1f\u5982\u4f55\u5728Python\u7a0b\u5e8f\u4e2d\u5b9e\u73b0\u8fde\u63a5\u6c60\uff1f<\/strong><\/p>\n<p>\u8fde\u63a5\u6c60\u662f\u4e00\u79cd\u7ba1\u7406\u548c\u91cd\u7528\u6570\u636e\u5e93\u8fde\u63a5\u7684\u6280\u672f\uff0c\u901a\u8fc7\u51cf\u5c11\u6bcf\u6b21\u8bf7\u6c42\u4e2d\u5efa\u7acb\u548c\u5173\u95ed\u6570\u636e\u5e93\u8fde\u63a5\u7684\u5f00\u9500\uff0c\u63d0\u9ad8\u6570\u636e\u5e93\u64cd\u4f5c\u7684\u6548\u7387\u3002\u5728Python\u7a0b\u5e8f\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u7b2c\u4e09\u65b9\u5e93\u5982<code>pyodbc<\/code>\u6216<code>SQLAlchemy<\/code>\u6765\u5b9e\u73b0\u8fde\u63a5\u6c60\u7684\u529f\u80fd\u3002\u8fd9\u4e9b\u5e93\u63d0\u4f9b\u4e86\u8fde\u63a5\u6c60\u5bf9\u8c61\uff0c\u4f60\u53ef\u4ee5\u5728\u7a0b\u5e8f\u4e2d\u521b\u5efa\u548c\u83b7\u53d6\u6570\u636e\u5e93\u8fde\u63a5\uff0c\u4f7f\u7528\u5b8c\u6bd5\u540e\u5c06\u8fde\u63a5\u91ca\u653e\u56de\u8fde\u63a5\u6c60\uff0c\u4ee5\u4f9b\u5176\u4ed6\u8bf7\u6c42\u4f7f\u7528\u3002<\/p>\n<p><strong>2. 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