{"id":97168,"date":"2024-10-20T15:34:16","date_gmt":"2024-10-20T07:34:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/97168\/"},"modified":"2024-10-20T15:34:17","modified_gmt":"2024-10-20T07:34:17","slug":"qt%e4%b8%ad%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8%e5%91%bd%e4%bb%a4%e8%a1%8c%e6%9f%a5%e6%89%be%e6%95%b8%e6%93%9a%e5%ba%ab%e6%95%b8%e6%93%9a-qt%e4%b8%ad%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e6%9f%a5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/97168\/","title":{"rendered":"Qt\u4e2d\u5982\u4f55\u4f7f\u7528\u547d\u4ee4\u884c\u67e5\u627e\u6578\u64da\u5eab\u6578\u64da (qt\u4e2d\u6578\u64da\u5eab\u7684\u67e5\u627e\u547d\u4ee4\u884c)"},"content":{"rendered":"

Qt\u4e2d\u5982\u4f55\u4f7f\u7528\u547d\u4ee4\u884c\u67e5\u627e\u6578\u64da\u5eab\u6578\u64da<\/h1>\n

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Qt\u8207\u6578\u64da\u5eab\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n

Qt\u652f\u6301\u591a\u7a2e\u6578\u64da\u5eab\uff0c\u5305\u62ecSQLite\u3001MySQL\u3001PostgreSQL\u7b49\u3002\u4f7f\u7528Qt\u7684\u6578\u64da\u5eab\u6a21\u584a\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u8f15\u9b06\u5730\u9023\u63a5\u5230\u6578\u64da\u5eab\uff0c\u57f7\u884c\u67e5\u8a62\uff0c\u4e26\u8655\u7406\u7d50\u679c\u3002Qt\u7684\u6578\u64da\u5eab\u64cd\u4f5c\u4e3b\u8981\u901a\u904eQSqlDatabase\u3001QSqlQuery\u548cQSqlError\u7b49\u985e\u4f86\u5be6\u73fe\u3002<\/p>\n

\u8a2d\u7f6e\u6578\u64da\u5eab\u9023\u63a5<\/h2>\n

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QSqlDatabase db = QSqlDatabase::addDatabase(\"QSQLITE\");\ndb.setDatabaseName(\"example.db\");\n\nif (!db.open()) {\n    qDebug() << \"\u7121\u6cd5\u9023\u63a5\u5230\u6578\u64da\u5eab\uff1a\" << db.lastError().text();\n    return;\n}\n<\/code><\/pre>\n
\u5728\u9019\u6bb5\u4ee3\u78bc\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500bSQLite\u6578\u64da\u5eab\u7684\u9023\u63a5\uff0c\u4e26\u6aa2\u67e5\u662f\u5426\u6210\u529f\u6253\u958b\u3002\u5982\u679c\u9023\u63a5\u5931\u6557\uff0c\u5247\u8f38\u51fa\u932f\u8aa4\u4fe1\u606f\u3002<\/p>\n
\u4f7f\u7528\u547d\u4ee4\u884c\u67e5\u627e\u6578\u64da<\/h2>\n
\u4e00\u65e6\u6210\u529f\u9023\u63a5\u5230\u6578\u64da\u5eab\uff0c\u5c31\u53ef\u4ee5\u4f7f\u7528SQL\u67e5\u8a62\u4f86\u67e5\u627e\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u67e5\u627e\u6578\u64da\u7684\u793a\u4f8b\uff1a<\/p>\n
QSqlQuery query;\nquery.prepare(\"SELECT * FROM users WHERE age > :age\");\nquery.bindValue(\":age\", 18);\n\nif (!query.exec()) {\n    qDebug() << \"\u67e5\u8a62\u5931\u6557\uff1a\" << query.lastError().text();\n    return;\n}\n\nwhile (query.next()) {\n    QString name = query.value(\"name\").toString();\n    int age = query.value(\"age\").toInt();\n    qDebug() << \"\u59d3\u540d\uff1a\" << name << \", \u5e74\u9f61\uff1a\" << age;\n}\n<\/code><\/pre>\n
\u5728\u9019\u6bb5\u4ee3\u78bc\u4e2d\uff0c\u6211\u5011\u6e96\u5099\u4e86\u4e00\u500bSQL\u67e5\u8a62\uff0c\u67e5\u627e\u5e74\u9f61\u5927\u65bc18\u7684\u7528\u6236\u3002\u4f7f\u7528bindValue\u65b9\u6cd5\u53ef\u4ee5\u5b89\u5168\u5730\u7d81\u5b9a\u67e5\u8a62\u53c3\u6578\uff0c\u9632\u6b62SQL\u6ce8\u5165\u653b\u64ca\u3002\u67e5\u8a62\u57f7\u884c\u5f8c\uff0c\u6211\u5011\u4f7f\u7528while\u5faa\u74b0\u904d\u6b77\u7d50\u679c\u96c6\uff0c\u4e26\u8f38\u51fa\u6bcf\u500b\u7528\u6236\u7684\u59d3\u540d\u548c\u5e74\u9f61\u3002<\/p>\n
\u547d\u4ee4\u884c\u5de5\u5177\u7684\u4f7f\u7528<\/h2>\n
\u9664\u4e86\u5728Qt\u61c9\u7528\u7a0b\u5e8f\u4e2d\u67e5\u627e\u6578\u64da\u5916\uff0c\u958b\u767c\u8005\u9084\u53ef\u4ee5\u4f7f\u7528\u547d\u4ee4\u884c\u5de5\u5177\u4f86\u76f4\u63a5\u67e5\u8a62\u6578\u64da\u5eab\u3002\u4f8b\u5982\uff0c\u4f7f\u7528SQLite\u7684\u547d\u4ee4\u884c\u5de5\u5177\uff0c\u53ef\u4ee5\u76f4\u63a5\u5728\u7d42\u7aef\u4e2d\u57f7\u884cSQL\u67e5\u8a62\uff1a<\/p>\n
sqlite3 example.db\nSELECT * FROM users WHERE age > 18;\n<\/code><\/pre>\n
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\u7e3d\u7d50<\/h2>\n
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\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684Qt\u61c9\u7528\u7a0b\u5e8f\uff0cServer.HK\u63d0\u4f9b\u4e86\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u7528\u6236\u3002\u7121\u8ad6\u662f \u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u60a8\u90fd\u53ef\u4ee5\u5728\u6211\u5011\u7684\u7db2\u7ad9\u4e0a\u627e\u5230\u5408\u9069\u7684\u65b9\u6848\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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