{"id":141939,"date":"2024-10-31T22:10:23","date_gmt":"2024-10-31T14:10:23","guid":{"rendered":"https:\/\/server.hk\/cnblog\/141939\/"},"modified":"2024-10-31T22:10:25","modified_gmt":"2024-10-31T14:10:25","slug":"sql-text-%e5%ad%97%e6%ae%b5%e4%b8%8d%e8%83%bd%e9%a1%af%e7%a4%ba%e7%9a%84%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/141939\/","title":{"rendered":"SQL TEXT \u5b57\u6bb5\u4e0d\u80fd\u986f\u793a\u7684\u89e3\u6c7a\u65b9\u6cd5"},"content":{"rendered":"<h1 id=\"sql-text-%e5%ad%97%e6%ae%b5%e4%b8%8d%e8%83%bd%e9%a1%af%e7%a4%ba%e7%9a%84%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%b3%95-feUQRLwBax\">SQL TEXT \u5b57\u6bb5\u4e0d\u80fd\u986f\u793a\u7684\u89e3\u6c7a\u65b9\u6cd5<\/h1>\n<p>\u5728\u4f7f\u7528 SQL \u6578\u64da\u5eab\u6642\uff0c\u958b\u767c\u8005\u7d93\u5e38\u6703\u9047\u5230\u5404\u7a2e\u5404\u6a23\u7684\u554f\u984c\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f TEXT \u5b57\u6bb5\u7684\u6578\u64da\u7121\u6cd5\u6b63\u5e38\u986f\u793a\u3002\u9019\u500b\u554f\u984c\u53ef\u80fd\u6703\u5f71\u97ff\u5230\u61c9\u7528\u7a0b\u5e8f\u7684\u529f\u80fd\uff0c\u5c0e\u81f4\u7528\u6236\u7121\u6cd5\u7372\u53d6\u6240\u9700\u7684\u4fe1\u606f\u3002\u672c\u6587\u5c07\u63a2\u8a0e SQL TEXT \u5b57\u6bb5\u4e0d\u80fd\u986f\u793a\u7684\u539f\u56e0\u53ca\u5176\u89e3\u6c7a\u65b9\u6cd5\u3002<\/p>\n<h2 id=\"text-%e5%ad%97%e6%ae%b5%e7%9a%84%e7%89%b9%e6%80%a7-feUQRLwBax\">TEXT \u5b57\u6bb5\u7684\u7279\u6027<\/h2>\n<p>\u5728 SQL \u4e2d\uff0cTEXT \u985e\u578b\u7684\u5b57\u6bb5\u7528\u65bc\u5b58\u5132\u9577\u6587\u672c\u6578\u64da\u3002\u8207 VARCHAR \u985e\u578b\u76f8\u6bd4\uff0cTEXT \u5b57\u6bb5\u53ef\u4ee5\u5b58\u5132\u66f4\u9577\u7684\u5b57\u7b26\u4e32\uff0c\u901a\u5e38\u7528\u65bc\u5b58\u5132\u6587\u7ae0\u5167\u5bb9\u3001\u63cf\u8ff0\u6216\u5176\u4ed6\u5927\u91cf\u6587\u672c\u6578\u64da\u3002\u5118\u7ba1 TEXT \u5b57\u6bb5\u975e\u5e38\u6709\u7528\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u767c\u73fe\u9019\u4e9b\u5b57\u6bb5\u7684\u6578\u64da\u7121\u6cd5\u6b63\u5e38\u986f\u793a\u3002<\/p>\n<h2 id=\"%e5%b8%b8%e8%a6%8b%e5%8e%9f%e5%9b%a0-feUQRLwBax\">\u5e38\u898b\u539f\u56e0<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5c0e\u81f4 SQL TEXT \u5b57\u6bb5\u7121\u6cd5\u986f\u793a\u7684\u5e38\u898b\u539f\u56e0\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u5eab\u9023\u63a5\u554f\u984c\uff1a<\/strong>\u5982\u679c\u61c9\u7528\u7a0b\u5e8f\u7121\u6cd5\u6b63\u78ba\u9023\u63a5\u5230\u6578\u64da\u5eab\uff0c\u5247\u7121\u6cd5\u6aa2\u7d22 TEXT \u5b57\u6bb5\u7684\u6578\u64da\u3002<\/li>\n<li><strong>\u67e5\u8a62\u8a9e\u53e5\u932f\u8aa4\uff1a<\/strong>\u5982\u679c SQL \u67e5\u8a62\u8a9e\u53e5\u6709\u8aa4\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u7121\u6cd5\u7372\u53d6 TEXT \u5b57\u6bb5\u7684\u6578\u64da\u3002<\/li>\n<li><strong>\u5b57\u7b26\u7de8\u78bc\u554f\u984c\uff1a<\/strong>\u5982\u679c\u6578\u64da\u5eab\u548c\u61c9\u7528\u7a0b\u5e8f\u4e4b\u9593\u7684\u5b57\u7b26\u7de8\u78bc\u4e0d\u4e00\u81f4\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u986f\u793a\u932f\u8aa4\u3002<\/li>\n<li><strong>\u6578\u64da\u5eab\u8a2d\u7f6e\u554f\u984c\uff1a<\/strong>\u67d0\u4e9b\u6578\u64da\u5eab\u8a2d\u7f6e\u53ef\u80fd\u6703\u5f71\u97ff TEXT \u5b57\u6bb5\u7684\u986f\u793a\uff0c\u4f8b\u5982\u6700\u5927\u5305\u5927\u5c0f\u9650\u5236\u3002<\/li>\n<\/ul>\n<h2 id=\"%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%b3%95-feUQRLwBax\">\u89e3\u6c7a\u65b9\u6cd5<\/h2>\n<p>\u91dd\u5c0d\u4e0a\u8ff0\u554f\u984c\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u89e3\u6c7a\u65b9\u6cd5\uff1a<\/p>\n<h3 id=\"1-%e6%aa%a2%e6%9f%a5%e6%95%b8%e6%93%9a%e5%ba%ab%e9%80%a3%e6%8e%a5-feUQRLwBax\">1. \u6aa2\u67e5\u6578\u64da\u5eab\u9023\u63a5<\/h3>\n<p>\u9996\u5148\uff0c\u78ba\u4fdd\u61c9\u7528\u7a0b\u5e8f\u80fd\u5920\u6b63\u78ba\u9023\u63a5\u5230\u6578\u64da\u5eab\u3002\u6aa2\u67e5\u9023\u63a5\u5b57\u7b26\u4e32\u4e2d\u7684\u7528\u6236\u540d\u3001\u5bc6\u78bc\u548c\u6578\u64da\u5eab\u540d\u7a31\u662f\u5426\u6b63\u78ba\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u78bc\u6aa2\u67e5\u9023\u63a5\uff1a<\/p>\n<pre><code>try {\n    $conn = new PDO(\"mysql:host=$servername;dbname=$dbname\", $username, $password);\n    \/\/ \u8a2d\u7f6e PDO \u932f\u8aa4\u6a21\u5f0f\u70ba\u7570\u5e38\n    $conn-&gt;setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);\n    echo \"\u9023\u63a5\u6210\u529f\"; \n} catch(PDOException $e) {\n    echo \"\u9023\u63a5\u5931\u6557: \" . $e-&gt;getMessage();\n}<\/code><\/pre>\n<h3 id=\"2-%e6%aa%a2%e6%9f%a5%e6%9f%a5%e8%a9%a2%e8%aa%9e%e5%8f%a5-feUQRLwBax\">2. \u6aa2\u67e5\u67e5\u8a62\u8a9e\u53e5<\/h3>\n<p>\u78ba\u4fdd SQL \u67e5\u8a62\u8a9e\u53e5\u6b63\u78ba\u7121\u8aa4\u3002\u53ef\u4ee5\u4f7f\u7528\u7c21\u55ae\u7684 SELECT \u8a9e\u53e5\u4f86\u6e2c\u8a66 TEXT \u5b57\u6bb5\u7684\u986f\u793a\uff1a<\/p>\n<pre><code>SELECT text_field FROM your_table WHERE condition;<\/code><\/pre>\n<p>\u5982\u679c\u67e5\u8a62\u8fd4\u56de\u7a7a\u7d50\u679c\uff0c\u5247\u9700\u8981\u6aa2\u67e5\u689d\u4ef6\u662f\u5426\u6b63\u78ba\u3002<\/p>\n<h3 id=\"3-%e7%a2%ba%e8%aa%8d%e5%ad%97%e7%ac%a6%e7%b7%a8%e7%a2%bc-feUQRLwBax\">3. \u78ba\u8a8d\u5b57\u7b26\u7de8\u78bc<\/h3>\n<p>\u78ba\u4fdd\u6578\u64da\u5eab\u548c\u61c9\u7528\u7a0b\u5e8f\u4f7f\u7528\u76f8\u540c\u7684\u5b57\u7b26\u7de8\u78bc\u3002\u901a\u5e38\uff0cUTF-8 \u662f\u6700\u5e38\u7528\u7684\u7de8\u78bc\u683c\u5f0f\u3002\u53ef\u4ee5\u5728\u6578\u64da\u5eab\u4e2d\u8a2d\u7f6e\u5b57\u7b26\u96c6\uff1a<\/p>\n<pre><code>SET NAMES 'utf8';<\/code><\/pre>\n<h3 id=\"4-%e6%aa%a2%e6%9f%a5%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a8%ad%e7%bd%ae-feUQRLwBax\">4. \u6aa2\u67e5\u6578\u64da\u5eab\u8a2d\u7f6e<\/h3>\n<p>\u6aa2\u67e5\u6578\u64da\u5eab\u7684\u8a2d\u7f6e\uff0c\u7279\u5225\u662f\u6700\u5927\u5305\u5927\u5c0f\u9650\u5236\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u8a9e\u53e5\u67e5\u770b\u7576\u524d\u8a2d\u7f6e\uff1a<\/p>\n<pre><code>SHOW VARIABLES LIKE 'max_allowed_packet';<\/code><\/pre>\n<p>\u5982\u679c\u9700\u8981\uff0c\u53ef\u4ee5\u8abf\u6574\u6b64\u8a2d\u7f6e\u4ee5\u5141\u8a31\u66f4\u5927\u7684\u6578\u64da\u5305\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-feUQRLwBax\">\u7e3d\u7d50<\/h2>\n<p>\u5728\u8655\u7406 SQL TEXT \u5b57\u6bb5\u6642\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u9047\u5230\u6578\u64da\u7121\u6cd5\u986f\u793a\u7684\u554f\u984c\u3002\u901a\u904e\u6aa2\u67e5\u6578\u64da\u5eab\u9023\u63a5\u3001\u67e5\u8a62\u8a9e\u53e5\u3001\u5b57\u7b26\u7de8\u78bc\u548c\u6578\u64da\u5eab\u8a2d\u7f6e\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u89e3\u6c7a\u9019\u4e9b\u554f\u984c\u3002\u4e86\u89e3\u9019\u4e9b\u57fa\u672c\u6982\u5ff5\u5c07\u6709\u52a9\u65bc\u63d0\u9ad8\u958b\u767c\u6548\u7387\uff0c\u4e26\u78ba\u4fdd\u61c9\u7528\u7a0b\u5e8f\u7684\u7a69\u5b9a\u6027\u3002<\/p>\n<p>\u5982\u679c\u60a8\u9700\u8981\u66f4\u591a\u6709\u95dc <a href=\"https:\/\/server.hk\">\u9999\u6e2f VPS<\/a> \u548c\u6578\u64da\u5eab\u7ba1\u7406\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u6e90\u548c\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u89e3\u6c7aSQL TEXT\u5b57\u6bb5\u7121\u6cd5\u986f\u793a\u7684\u554f\u984c\uff0c\u63d0\u4f9b\u6709\u6548\u7684\u65b9\u6cd5\u548c\u6280\u5de7\uff0c\u52a9\u60a8\u8f15\u9b06\u8655\u7406\u6578\u64da\u986f\u793a\u56f0\u96e3\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-141939","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/141939","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=141939"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/141939\/revisions"}],"predecessor-version":[{"id":141940,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/141939\/revisions\/141940"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=141939"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=141939"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=141939"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}