{"id":173207,"date":"2024-11-07T16:04:27","date_gmt":"2024-11-07T08:04:27","guid":{"rendered":"https:\/\/server.hk\/cnblog\/173207\/"},"modified":"2024-11-07T16:04:28","modified_gmt":"2024-11-07T08:04:28","slug":"vfp-%e5%af%a6%e7%8f%be%e9%ab%98%e6%95%88%e5%88%aa%e9%99%a4%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e6%8a%80%e5%b7%a7-vfp-%e5%88%aa%e9%99%a4%e6%95%b8%e6%93%9a%e5%ba%ab%e8%aa%9e%e5%8f%a5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/173207\/","title":{"rendered":"VFP \u5be6\u73fe\u9ad8\u6548\u522a\u9664\u6578\u64da\u5eab\u7684\u6280\u5de7 (vfp \u522a\u9664\u6578\u64da\u5eab\u8a9e\u53e5)"},"content":{"rendered":"

VFP \u5be6\u73fe\u9ad8\u6548\u522a\u9664\u6578\u64da\u5eab\u7684\u6280\u5de7<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u522a\u9664\u6578\u64da\u662f\u4e00\u9805\u5e38\u898b\u7684\u64cd\u4f5c\u3002\u5c0d\u65bc\u4f7f\u7528 Visual FoxPro (VFP) \u7684\u958b\u767c\u8005\u4f86\u8aaa\uff0c\u5982\u4f55\u9ad8\u6548\u5730\u522a\u9664\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u4e00\u4e9b\u6709\u6548\u7684 VFP \u522a\u9664\u6578\u64da\u5eab\u8a9e\u53e5\u53ca\u5176\u6280\u5de7\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u63d0\u9ad8\u6578\u64da\u522a\u9664\u7684\u6548\u7387\u3002<\/p>\n

1. \u4f7f\u7528 DELETE \u8a9e\u53e5<\/h2>\n

\u5728 VFP \u4e2d\uff0c\u6700\u57fa\u672c\u7684\u522a\u9664\u64cd\u4f5c\u662f\u4f7f\u7528 DELETE<\/code> \u8a9e\u53e5\u3002\u9019\u500b\u8a9e\u53e5\u53ef\u4ee5\u7528\u4f86\u522a\u9664\u7576\u524d\u5de5\u4f5c\u5340\u4e2d\u7684\u8a18\u9304\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff1a<\/p>\n

DELETE FROM Customers WHERE CustomerID = 1<\/code><\/pre>\n
\u9019\u689d\u8a9e\u53e5\u5c07\u522a\u9664 Customers<\/code> \u8868\u4e2d CustomerID<\/code> \u70ba 1 \u7684\u8a18\u9304\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u9019\u500b\u64cd\u4f5c\u662f\u4e0d\u53ef\u9006\u7684\uff0c\u56e0\u6b64\u5728\u57f7\u884c\u522a\u9664\u64cd\u4f5c\u4e4b\u524d\uff0c\u5efa\u8b70\u5148\u9032\u884c\u6578\u64da\u5099\u4efd\u3002<\/p>\n
2. \u4f7f\u7528 PACK \u547d\u4ee4<\/h2>\n
\u5728 VFP \u4e2d\uff0c\u522a\u9664\u8a18\u9304\u5f8c\uff0c\u9019\u4e9b\u8a18\u9304\u4ecd\u7136\u6703\u4f54\u7528\u78c1\u789f\u7a7a\u9593\u3002\u70ba\u4e86\u91cb\u653e\u9019\u4e9b\u7a7a\u9593\uff0c\u53ef\u4ee5\u4f7f\u7528 PACK<\/code> \u547d\u4ee4\u3002\u9019\u500b\u547d\u4ee4\u6703\u5c07\u6240\u6709\u672a\u522a\u9664\u7684\u8a18\u9304\u58d3\u7e2e\u5230\u4e00\u8d77\uff0c\u5f9e\u800c\u91cb\u653e\u51fa\u7a7a\u9593\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528 PACK<\/code> \u7684\u793a\u4f8b\uff1a<\/p>\n
USE Customers\nDELETE ALL\nPACK<\/code><\/pre>\n
\u9019\u6bb5\u4ee3\u78bc\u9996\u5148\u6253\u958b Customers<\/code> \u8868\uff0c\u7136\u5f8c\u522a\u9664\u6240\u6709\u8a18\u9304\uff0c\u6700\u5f8c\u4f7f\u7528 PACK<\/code> \u547d\u4ee4\u91cb\u653e\u7a7a\u9593\u3002<\/p>\n
3. \u4f7f\u7528 WHERE \u5b50\u53e5\u9032\u884c\u689d\u4ef6\u522a\u9664<\/h2>\n
\u5728\u522a\u9664\u6578\u64da\u6642\uff0c\u4f7f\u7528 WHERE<\/code> \u5b50\u53e5\u53ef\u4ee5\u5e6b\u52a9\u6211\u5011\u7cbe\u78ba\u5730\u522a\u9664\u7279\u5b9a\u7684\u8a18\u9304\uff0c\u800c\u4e0d\u662f\u522a\u9664\u6574\u500b\u8868\u4e2d\u7684\u6240\u6709\u8a18\u9304\u3002\u9019\u6a23\u53ef\u4ee5\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u4e1f\u5931\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n
DELETE FROM Orders WHERE OrderDate < '2022-01-01'<\/code><\/pre>\n
\u9019\u689d\u8a9e\u53e5\u5c07\u522a\u9664\u6240\u6709\u5728 2022 \u5e74 1 \u6708 1 \u65e5\u4e4b\u524d\u7684\u8a02\u55ae\u8a18\u9304\u3002<\/p>\n
4. \u4f7f\u7528 TRANSACTION \u9032\u884c\u5b89\u5168\u522a\u9664<\/h2>\n
\u5728\u9032\u884c\u522a\u9664\u64cd\u4f5c\u6642\uff0c\u4f7f\u7528 TRANSACTION<\/code> \u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\u3002\u5982\u679c\u522a\u9664\u904e\u7a0b\u4e2d\u51fa\u73fe\u932f\u8aa4\uff0c\u53ef\u4ee5\u4f7f\u7528 ROLLBACK<\/code> \u4f86\u64a4\u92b7\u64cd\u4f5c\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528 TRANSACTION<\/code> \u7684\u793a\u4f8b\uff1a<\/p>\n
BEGIN TRANSACTION\nDELETE FROM Customers WHERE CustomerID = 1\nIF (ERROR() = 0)\n    COMMIT\nELSE\n    ROLLBACK\nENDIF<\/code><\/pre>\n
\u9019\u6bb5\u4ee3\u78bc\u9996\u5148\u958b\u59cb\u4e00\u500b\u4e8b\u52d9\uff0c\u7136\u5f8c\u5617\u8a66\u522a\u9664\u4e00\u689d\u8a18\u9304\u3002\u5982\u679c\u6c92\u6709\u932f\u8aa4\uff0c\u5247\u63d0\u4ea4\u4e8b\u52d9\uff1b\u5982\u679c\u51fa\u73fe\u932f\u8aa4\uff0c\u5247\u56de\u6efe\u4e8b\u52d9\u3002<\/p>\n
5. \u5b9a\u671f\u7dad\u8b77\u6578\u64da\u5eab<\/h2>\n
\u9664\u4e86\u4f7f\u7528\u4e0a\u8ff0\u6280\u5de7\u5916\uff0c\u5b9a\u671f\u7dad\u8b77\u6578\u64da\u5eab\u4e5f\u662f\u63d0\u9ad8\u522a\u9664\u6548\u7387\u7684\u91cd\u8981\u63aa\u65bd\u3002\u5b9a\u671f\u57f7\u884c REINDEX<\/code> \u548c OPTIMIZE<\/code> \u547d\u4ee4\u53ef\u4ee5\u5e6b\u52a9\u4fdd\u6301\u6578\u64da\u5eab\u7684\u6027\u80fd\uff0c\u5f9e\u800c\u63d0\u9ad8\u522a\u9664\u64cd\u4f5c\u7684\u6548\u7387\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u5728 VFP \u4e2d\uff0c\u9ad8\u6548\u522a\u9664\u6578\u64da\u5eab\u7684\u6280\u5de7\u5305\u62ec\u4f7f\u7528 DELETE<\/code> \u8a9e\u53e5\u3001PACK<\/code> \u547d\u4ee4\u3001WHERE<\/code> \u5b50\u53e5\u3001TRANSACTION<\/code> \u4ee5\u53ca\u5b9a\u671f\u7dad\u8b77\u6578\u64da\u5eab\u3002\u9019\u4e9b\u6280\u5de7\u4e0d\u50c5\u80fd\u63d0\u9ad8\u522a\u9664\u64cd\u4f5c\u7684\u6548\u7387\uff0c\u9084\u80fd\u78ba\u4fdd\u6578\u64da\u7684\u5b89\u5168\u6027\u548c\u5b8c\u6574\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u7ba1\u7406\u7684\u7528\u6236\uff0c\u9078\u64c7\u5408\u9069\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4e5f\u662f\u4e00\u500b\u91cd\u8981\u7684\u8003\u91cf\uff0c\u7279\u5225\u662f\u5728\u9999\u6e2f\u9019\u6a23\u7684\u5e02\u5834\u4e2d\uff0c\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u63d0\u4f9b\u4e86\u7a69\u5b9a\u548c\u9ad8\u6548\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u638c\u63e1 VFP \u522a\u9664\u6578\u64da\u5eab\u7684\u9ad8\u6548\u6280\u5de7\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\uff0c\u7c21\u5316\u522a\u9664\u8a9e\u53e5\uff0c\u78ba\u4fdd\u6578\u64da\u5b89\u5168\u8207\u5b8c\u6574\u6027\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-173207","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/173207","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=173207"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/173207\/revisions"}],"predecessor-version":[{"id":173208,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/173207\/revisions\/173208"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=173207"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=173207"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=173207"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}