{"id":41443,"date":"2023-01-29T11:01:12","date_gmt":"2023-06-12T10:48:51","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e8%bf%9e%e6%8e%a5%e5%88%b0postgresql%e6%95%b0%e6%8d%ae%e5%ba%93\/"},"modified":"2024-04-29T12:03:44","modified_gmt":"2024-04-29T04:03:44","slug":"%e8%bf%9e%e6%8e%a5%e5%88%b0postgresql%e6%95%b0%e6%8d%ae%e5%ba%93","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e8%bf%9e%e6%8e%a5%e5%88%b0postgresql%e6%95%b0%e6%8d%ae%e5%ba%93\/","title":{"rendered":"\u8fde\u63a5\u5230PostgreSQL\u6570\u636e\u5e93"},"content":{"rendered":"

\u6211\u5bf9\u4f7f\u7528\u6807\u51c6\u7684[database\/sql]\u8fde\u63a5\u5230PostgreSQL\u548c\u4f7f\u7528ORM\u7684GORM\u8fde\u63a5\u5230PostgreSQL\u8fd9\u4e24\u79cd\u60c5\u51b5\u8fdb\u884c\u4e86\u6bd4\u8f83\u3002<\/p>\n

\u4e00\u79cd\u9009\u62e9: \u6807\u51c6<\/h1>\n

\u9996\u5148\uff0c\u5982\u679c\u4f7f\u7528\u6807\u51c6\u7684[database\/sql]\u3002<\/p>\n

package<\/span> main<\/span>\r\n\r\nimport<\/span> (<\/span>\r\n    \"database\/sql\"<\/span>\r\n    \"fmt\"<\/span>\r\n    \"log\"<\/span>\r\n    _<\/span> \"github.com\/lib\/pq\"<\/span>\r\n)<\/span>\r\n\r\ntype<\/span> Sale<\/span> struct<\/span> {<\/span>\r\n    Id<\/span>   string<\/span>\r\n    OrderId<\/span> string<\/span>\r\n}<\/span>\r\n\r\nfunc<\/span> main<\/span>()<\/span> {<\/span>\r\n    db<\/span>,<\/span> err<\/span> :=<\/span> sql<\/span>.<\/span>Open<\/span>(<\/span>\"postgres\"<\/span>,<\/span> \"postgres:\/\/user:pass@host:port\/dbname\"<\/span>)<\/span>\r\n    if<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n        log<\/span>.<\/span>Fatalln<\/span>(<\/span>\"\u63a5\u7d9a\u5931\u6557\"<\/span>,<\/span> err<\/span>)<\/span>\r\n    }<\/span>\r\n    defer<\/span> db<\/span>.<\/span>Close<\/span>()<\/span>\r\n\r\n    \/\/ \u53d6\u5f97\u4ef6\u6570\u3092\u6761\u4ef6[$1]\u306b\u3059\u308b<\/span>\r\n    \/\/ ?\u3060\u3068\u30a8\u30e9\u30fc\u304c\u767a\u751f<\/span>\r\n    \/\/cmd := \"select id, order_id from final_sales where id like $1\"<\/span>\r\n    cmd<\/span> :=<\/span> \"select id, order_id from final_sales where id like $1\"<\/span>\r\n    \/\/\u53d6\u5f97\u3059\u308b\u30c7\u30fc\u30bf\u304c1\u4ef6\u306e\u5834\u5408\u306f\u3001QueryRow\u3082\u5229\u7528\u3067\u304d\u308b<\/span>\r\n    rows<\/span>,<\/span> _<\/span> :=<\/span> db<\/span>.<\/span>Query<\/span>(<\/span>cmd<\/span>,<\/span> \"T00%\"<\/span>)<\/span>\r\n    defer<\/span> rows<\/span>.<\/span>Close<\/span>()<\/span>\r\n\r\n    var<\/span> sales<\/span> []<\/span>Sale<\/span> \/\/ \u53d6\u5f97\u3059\u308b\u30c7\u30fc\u30bf\u306e\u69cb\u9020\u4f53\u3092\u7528\u610f\uff08\u8907\u6570\u53d6\u5f97\u3059\u308b\u306e\u3067\u30b9\u30e9\u30a4\u30b9\uff09<\/span>\r\n    for<\/span> rows<\/span>.<\/span>Next<\/span>()<\/span> {<\/span>\r\n        var<\/span> tmp<\/span> Sale<\/span> \/\/ \u53d6\u5f97\u306e\u683c\u7d0d\u7528<\/span>\r\n        err<\/span> :=<\/span> rows<\/span>.<\/span>Scan<\/span>(<\/span>&<\/span>tmp<\/span>.<\/span>Id<\/span>,<\/span> &<\/span>tmp<\/span>.<\/span>OrderId<\/span>)<\/span>\r\n        if<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n            log<\/span>.<\/span>Fatalln<\/span>(<\/span>\"\u53d6\u5f97\u5931\u6557\"<\/span>,<\/span> err<\/span>)<\/span>\r\n        }<\/span>\r\n        sales<\/span> =<\/span> append<\/span>(<\/span>sales<\/span>,<\/span> tmp<\/span>)<\/span>\r\n    }<\/span>\r\n    for<\/span> _<\/span>,<\/span> sale<\/span> :=<\/span> range<\/span> sales<\/span> {<\/span>\r\n        fmt<\/span>.<\/span>Println<\/span>(<\/span>sale<\/span>.<\/span>Id<\/span>,<\/span> sale<\/span>.<\/span>OrderId<\/span>)<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
ORM – Object Relational Mapping (\u5bf9\u8c61\u5173\u7cfb\u6620\u5c04)<\/h1>\n
\u4e0b\u4e00\u6b65\u4f7f\u7528ORM [gorm] \u7684\u60c5\u51b5\u4e0b\u3002<\/p>\n
package<\/span> main<\/span>\r\n\r\nimport<\/span> (<\/span>\r\n    \"fmt\"<\/span>\r\n    \"log\"<\/span>\r\n\r\n    \"github.com\/jinzhu\/gorm\"<\/span>\r\n\r\n    _<\/span> \"github.com\/lib\/pq\"<\/span>\r\n)<\/span>\r\n\r\n\/\/ `\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30c6\u30fc\u30d6\u30eb\u540d\u306f`sales`\u3068\u81ea\u52d5\u5224\u65ad<\/span>\r\ntype<\/span> Sale<\/span> struct<\/span> {<\/span>\r\n    Id<\/span>   string<\/span> `gorm:\"column:sale_id\"`<\/span>\r\n    OrderId<\/span> string<\/span> `gorm:\"column:order_id\"`<\/span>\r\n}<\/span>\r\n\r\n\/\/ \u4eca\u56de\u306f\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u306a\u3044\u306e\u3067\u6307\u5b9a\u3059\u308b<\/span>\r\nfunc<\/span> (<\/span>Sale<\/span>)<\/span> TableName<\/span>()<\/span> string<\/span> {<\/span>\r\n    return<\/span> \"final_sales\"<\/span>\r\n}<\/span>\r\n\r\nfunc<\/span> main<\/span>()<\/span> {<\/span>\r\n    db<\/span>,<\/span> err<\/span> :=<\/span> gorm<\/span>.<\/span>Open<\/span>(<\/span>\"postgres\"<\/span>,<\/span> \"postgres:\/\/user:pass@host:port\/dbname\"<\/span>)<\/span>\r\n    if<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n        log<\/span>.<\/span>Fatalln<\/span>(<\/span>\"\u63a5\u7d9a\u5931\u6557\"<\/span>,<\/span> err<\/span>)<\/span>\r\n    }<\/span>\r\n    defer<\/span> db<\/span>.<\/span>Close<\/span>()<\/span>\r\n\r\n    var<\/span> sales<\/span> []<\/span>Sale<\/span> \/\/ \u53d6\u5f97\u3059\u308b\u30c7\u30fc\u30bf\u306e\u69cb\u9020\u4f53\u3092\u7528\u610f\uff08\u8907\u6570\u53d6\u5f97\u3059\u308b\u306e\u3067\u30b9\u30e9\u30a4\u30b9\uff09<\/span>\r\n    err<\/span> =<\/span> db<\/span>.<\/span>Where<\/span>(<\/span>\"sale_id like ?\"<\/span>,<\/span> \"T00%\"<\/span>)<\/span>.<\/span>Find<\/span>(<\/span>&<\/span>sales<\/span>)<\/span>.<\/span>Error<\/span>\r\n\r\n    if<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n        log<\/span>.<\/span>Fatalln<\/span>(<\/span>\"\u53d6\u5f97\u5931\u6557\"<\/span>,<\/span> err<\/span>)<\/span>\r\n    }<\/span>\r\n\r\n    fmt<\/span>.<\/span>Println<\/span>(<\/span>sales<\/span>)<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u76f8\u6096\u4e4b\u5904<\/h1>\n
\u5bfc\u5165<\/h2>\n
\u5728\u4e2d\u56fd\u7ffb\u8fc7\u6765\u7684\u8bdd\u662f\uff1a\u6211\u4eec\u5c06\u5bfc\u5165github.com\/jinzhu\/gorm\u6765\u4ee3\u66ffdatabase\/sql\u3002<\/p>\n
\u8fde\u63a5\u65b9\u5f0f<\/h2>\n
\u5c06\u8fde\u63a5\u4ece sql.Open \u66f4\u6539\u4e3a gorm.Open\u3002<\/p>\n
\u58f0\u660e\u7ed3\u6784\u4f53<\/h2>\n
\u5728\u7ed3\u6784\u4f53\u58f0\u660e\u4e2d\u6dfb\u52a0gorm:”column:sale_id”\u3002
\n\u8fd9\u5c06\u7528\u4e8egorm\u5728\u81ea\u52a8\u63d0\u53d6\u6570\u636e\u65f6\u7684\u5224\u65ad\u3002<\/p>\n
\u53e6\u5916\uff0cOrderId\u5c07\u81ea\u52d5\u9032\u884c\u86c7\u5f62\u547d\u540d\u6cd5\u548c\u99dd\u5cf0\u547d\u540d\u6cd5\u4e4b\u9593\u7684\u8f49\u63db\u3002
\n\u56e0\u6b64\uff0c\u5373\u4f7f\u6c92\u6709\u6307\u5b9a\u5217\u540d\uff0c\u4e5f\u6c92\u6709\u554f\u984c\u3002<\/p>\n
type<\/span> Sale<\/span> struct<\/span> {<\/span>\r\n    Id<\/span>   string<\/span> `gorm:\"column:sale_id\"`<\/span>\r\n    OrderId<\/span> string<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u8bf7\u53c2\u8003\u4ee5\u4e0b\u7f51\u7ad9\u3002
\n\u6307\u5b9a\u5217\u540d\u7684\u65b9\u6cd5<\/p>\n
\u6307\u5b9a\u8868\u683c\u540d\u79f0<\/h2>\n
\u5728gorm\u4e2d\uff0c\u58f0\u660e\u7684\u7ed3\u6784\u4f53\u7684\u590d\u6570\u5f62\u5f0f\u4f1a\u81ea\u52a8\u5224\u65ad\u4e3a\u8868\u540d\u3002
\n\u7531\u4e8e\u672c\u6b21\u4e0e\u81ea\u52a8\u5224\u65ad\u7684\u540d\u79f0\u4e0d\u540c\uff0c\u56e0\u6b64\u9700\u8981\u58f0\u660e\u8868\u540d\u3002<\/p>\n
func<\/span> (<\/span>Sale<\/span>)<\/span> TableName<\/span>()<\/span> string<\/span> {<\/span>\r\n    return<\/span> \"final_sales\"<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u8bf7\u67e5\u770b\u4e0b\u8ff0\u5185\u5bb9\uff1a
\n\u590d\u6570\u5f62\u5f0f\u7684\u8868\u540d\u3002<\/p>\n
\u6570\u636e\u83b7\u53d6\u65b9\u5f0f<\/h2>\n
\u7531\u65bc\u4f7f\u7528ORM\uff0c\u4e0d\u9700\u8981\u64b0\u5bebSQL\u8a9e\u53e5\u3002
\n\u7576\u7136\u4e5f\u53ef\u4ee5\u9078\u64c7\u64b0\u5bebSQL\u8a9e\u53e5\u3002<\/p>\n
\u4f7f\u7528ORM\u53ef\u4ee5\u4e00\u6b21\u83b7\u53d6\u591a\u4e2a\u6570\u636e\uff0c\u800c\u4e0d\u9700\u8981\u4f7f\u7528for\u5faa\u73af\u9010\u4e2a\u83b7\u53d6\u5e76\u5b58\u50a8\u5230\u7ed3\u6784\u4f53\u7684\u5207\u7247\u4e2d\u3002<\/p>\n
err<\/span> =<\/span> db<\/span>.<\/span>Where<\/span>(<\/span>\"sale_id like ?\"<\/span>,<\/span> \"T00%\"<\/span>)<\/span>.<\/span>Find<\/span>(<\/span>&<\/span>sales<\/span>)<\/span>.<\/span>Error<\/span>\r\n<\/code><\/pre>\n
\u8bf7\u53c2\u8003\u4ee5\u4e0b\u5185\u5bb9\uff1a
\n\u5728\u54ea\u91cc
\n\u9519\u8bef\u5904\u7406<\/p>\n
\u6574\u7406<\/h1>\n
\u6211\u66fe\u7ecf\u6709\u8fc7\u5728\u672c\u5730\u7684SQLite\u548c\u670d\u52a1\u5668\u4e0a\u7684SQLSever\u4e2d\u5206\u522b\u7f16\u5199SQL\u7684\u9879\u76ee\u7ecf\u9a8c\u3002
\n\u5982\u679c\u4f60\u4e86\u89e3ORM\uff0c\u5c31\u53ef\u4ee5\u907f\u514d\u8fd9\u6837\u7e41\u7410\u7684\u64cd\u4f5c\u3002
\n\u76ee\u524d\uff0c\u6211\u5df2\u7ecf\u51c6\u5907\u4e86\u8fde\u63a5\u5230PostgreSQL\u7684\u73af\u5883\u53d8\u91cf\uff0c\u5982\u679c\u65e0\u6cd5\u83b7\u53d6\u5230\u73af\u5883\u53d8\u91cf\uff0c\u5219\u4f1a\u5c06\u5176\u5224\u65ad\u4e3a\u672c\u5730\u5f00\u53d1\u73af\u5883\uff0c\u5e76\u8fde\u63a5\u5230SQLite\u3002
\n\u7531\u4e8e\u6ca1\u6709\u7f16\u5199\u539f\u59cbSQL\uff0c\u6240\u4ee5\u76ee\u524d\u5373\u4f7f\u6570\u636e\u5e93\u53d1\u751f\u53d8\u5316\uff0c\u4e5f\u4e0d\u4f1a\u51fa\u73b0\u9519\u8bef\u3002<\/p>\n
\u7136\u800c\uff0c\u5728\u4e00\u822c\u9879\u76ee\u4e2d\uff0c\u6211\u8ba4\u4e3a\u51c6\u5907\u76f8\u540c\u7684\u6570\u636e\u5e93\u5728\u670d\u52a1\u5668\u548c\u672c\u5730\u4e0a\u662f\u597d\u7684\uff0c\u8fd9\u6837\u53ef\u4ee5\u907f\u514d\u56e0\u6570\u636e\u5e93\u5dee\u5f02\u800c\u4ea7\u751f\u7684\u884c\u4e3a\u5dee\u5f02\u3002\u6b64\u5916\uff0c\u8fd8\u9700\u8981\u8bb0\u4f4fORM\u7279\u6709\u7684\u5199\u6cd5\u3002<\/p>\n
\u8bf7\u53c2\u7167\u8fd9\u4e2a\u6307\u5357\u529e\u4e8b\u3002<\/h1>\n
\u6307\u5b9a\u5217\u540d\u7684\u65b9\u6cd5
\n\u591a\u4e2a\u8868\u540d\u7684\u590d\u6570\u5f62\u5f0f
\nWHERE
\n\u9519\u8bef\u5904\u7406\u673a\u5236<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6211\u5bf9\u4f7f\u7528\u6807\u51c6\u7684[database\/sql]\u8fde\u63a5\u5230PostgreSQL\u548c\u4f7f\u7528ORM\u7684GORM\u8fde\u63a5\u5230Postgre […]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-41443","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n\u8fde\u63a5\u5230PostgreSQL\u6570\u636e\u5e93 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u8fde\u63a5\u5230postgresql\u6570\u636e\u5e93\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u8fde\u63a5\u5230PostgreSQL\u6570\u636e\u5e93\" \/>\n<meta property=\"og:description\" content=\"\u6211\u5bf9\u4f7f\u7528\u6807\u51c6\u7684[database\/sql]\u8fde\u63a5\u5230PostgreSQL\u548c\u4f7f\u7528ORM\u7684GORM\u8fde\u63a5\u5230Postgre […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u8fde\u63a5\u5230postgresql\u6570\u636e\u5e93\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2023-06-12T10:48:51+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-04-29T04:03:44+00:00\" \/>\n<meta name=\"author\" content=\"\u9038, \u79d1\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u9038, \u79d1\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/%e8%bf%9e%e6%8e%a5%e5%88%b0postgresql%e6%95%b0%e6%8d%ae%e5%ba%93\/\",\"url\":\"https:\/\/www.silicloud.com\/zh\/blog\/%e8%bf%9e%e6%8e%a5%e5%88%b0postgresql%e6%95%b0%e6%8d%ae%e5%ba%93\/\",\"name\":\"\u8fde\u63a5\u5230PostgreSQL\u6570\u636e\u5e93 - 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