{"id":207426,"date":"2025-07-08T12:47:10","date_gmt":"2025-07-08T04:47:10","guid":{"rendered":"https:\/\/server.hk\/cnblog\/207426\/"},"modified":"2025-07-08T12:47:10","modified_gmt":"2025-07-08T04:47:10","slug":"%e4%bd%bf%e7%94%a8-sql-null-%e7%b1%bb%e5%9e%8b%e8%bf%9b%e8%a1%8c%e9%aa%8c%e8%af%81%e5%99%a8%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/207426\/","title":{"rendered":"\u4f7f\u7528 sql null \u7c7b\u578b\u8fdb\u884c\u9a8c\u8bc1\u5668\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> \u4f7f\u7528 sql null \u7c7b\u578b\u8fdb\u884c\u9a8c\u8bc1\u5668\uff1f<\/span><\/p>\n

\u6765\u6e90\uff1astackoverflow<\/span>
\n2024-04-22 15:06:36<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u5404\u4f4d\u5c0f\u4f19\u4f34\u4eec\uff0c\u5927\u5bb6\u597d\u5440\uff01\u770b\u770b\u4eca\u5929\u6211\u53c8\u7ed9\u5404\u4f4d\u5e26\u6765\u4e86\u4ec0\u4e48\u6587\u7ae0\uff1f\u672c\u6587\u6807\u9898\u662f<\/span>\u300a\u4f7f\u7528 sql null \u7c7b\u578b\u8fdb\u884c\u9a8c\u8bc1\u5668\uff1f\u300b<\/span>\uff0c\u5f88\u660e\u663e\u662f\u5173\u4e8eGolang<\/span>\u7684\u6587\u7ae0\u54c8\u54c8\u54c8\uff0c\u5176\u4e2d\u5185\u5bb9\u4e3b\u8981\u4f1a\u6d89\u53ca\u5230<\/span>\u7b49\u7b49\uff0c\u5982\u679c\u80fd\u5e2e\u5230\u4f60\uff0c\u89c9\u5f97\u5f88\u4e0d\u9519\u7684\u8bdd\uff0c\u6b22\u8fce\u5404\u4f4d\u591a\u591a\u70b9\u8bc4\u548c\u5206\u4eab\uff01<\/span><\/p>\n

\u95ee\u9898\u5185\u5bb9
\n <\/p>\n

\u6211\u5728\u8ba9 golang \u9a8c\u8bc1\u5668\u5904\u7406 sql null \u7c7b\u578b\u65f6\u9047\u5230\u95ee\u9898\u3002\u8fd9\u662f\u6211\u5c1d\u8bd5\u8fc7\u7684\u793a\u4f8b\uff1a<\/p>\n

package main\n\nimport (\n    \"database\/sql\"\n    \"database\/sql\/driver\"\n    \"log\"\n\n    \"gopkg.in\/go-playground\/validator.v9\"\n)\n\n\/\/ NullInt64\ntype NullInt64 struct {\n    sql.NullInt64\n    Set bool\n}\n\nfunc MakeNullInt64(valid bool, val int64) NullInt64 {\n    n := NullInt64{}\n    n.Set = true\n    n.Valid = valid\n    if valid {\n        n.Int64 = val\n    }\n    return n\n}\nfunc (n *NullInt64) Value() (driver.Value, error) {\n    if !n.NullInt64.Valid {\n        return nil, nil\n    }\n    return n.NullInt64.Int64, nil\n}\n\ntype Thing struct {\n    N2 NullInt64 `validate:\"min=10\"`\n    N3 int64     `validate:\"min=10\"`\n    N4 *int64    `validate:\"min=10\"`\n}\n\nfunc main() {\n    validate := validator.New()\n\n    n := int64(6)\n    number := MakeNullInt64(true, n)\n    thing := Thing{number, n, &n}\n    e := validate.Struct(thing)\n\n    log.Println(e)\n}\n<\/pre>\n
\u5f53\u6211\u8fd0\u884c\u6b64\u4ee3\u7801\u65f6\uff0c\u6211\u53ea\u5f97\u5230\u4ee5\u4e0b\u8f93\u51fa\uff1a<\/p>\n
 \u952e\uff1a\u201cthing.n3\u201d\u9519\u8bef\uff1a\u201cn3\u201d\u7684\u5b57\u6bb5\u9a8c\u8bc1\u5728\u201cmin\u201d\u4e0a\u5931\u8d25 \u6807\u7b7e \u952e\uff1a\u201cthing.n4\u201d\u9519\u8bef\uff1a\u201cn4\u201d\u7684\u5b57\u6bb5\u9a8c\u8bc1\u5931\u8d25 \u201c\u5206\u949f\u201d\u6807\u7b7e <\/p>\n
\u95ee\u9898\u662f\u6211\u5e0c\u671b\u5b83\u4e5f\u663e\u793a thing.n2<\/code> \u5931\u8d25\u7684\u539f\u56e0\u4e0e thing.n3<\/code> \u548c thing.n4<\/code> \u76f8\u540c\u3002<\/p>\n
\u6211\u5c1d\u8bd5\u5f15\u5165 func (n *nullint64) value()<\/code> \u65b9\u6cd5\uff0c\u56e0\u4e3a\u6587\u6863\u4e2d\u63d0\u5230\u4e86\u5b83\u3002\u4f46\u6211\u60f3\u6211\u8bef\u89e3\u4e86\u4e00\u4e9b\u4e1c\u897f\u3002\u8c01\u80fd\u544a\u8bc9\u6211\u6211\u505a\u9519\u4e86\u4ec0\u4e48\uff1f<\/p>\n
 <\/p>\n
\u89e3\u51b3\u65b9\u6848<\/h2>\n
 <\/p>\n
\u66f4\u65b0<\/strong><\/p>\n
\u6709\u4e00\u4e2a\u4e13\u95e8\u7528\u4e8e\u6b64\u76ee\u7684\u7684 \u3002\u4f60\u53ef\u4ee5\u68c0\u67e5\u4e00\u4e0b\u3002\u6211\u63d0\u51fa\u7684\u5176\u4ed6\u89e3\u51b3\u65b9\u6848\u5e94\u8be5\u4ecd\u7136\u6709\u6548\u3002<\/p>\n
\u7531\u4e8e\u60a8\u5c1d\u8bd5\u9a8c\u8bc1\u7684\u503c\u662f sql.nullint64<\/code> \u5185\u7684 int64<\/code>\uff0c\u6700\u7b80\u5355\u7684\u65b9\u6cd5\u662f\u5220\u9664 validate<\/code> \u6807\u8bb0\uff0c\u7136\u540e\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\u6ce8\u518c \u9a8c\u8bc1\uff1a<\/p>\n
validate.registerstructvalidation(nullint64structlevelvalidation, nullint64{})\n<\/pre>\n
\u800c nullint64structlevelvalidation<\/code> \u662f\u4e00\u4e2a structlevelfunc<\/code>\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
func NullInt64StructLevelValidation(sl validator.StructLevel) {\n    ni := sl.Current().Interface().(NullInt64)\n    if ni.NullInt64.Int64 < 10 {\n        sl.ReportError(ni.NullInt64.Int64, \"Int64\", \"\", \"min\", \"\")\n    }\n}\n<\/pre>\n
\u6ce8\u610f#1\uff1a\u8fd9\u4e00\u884c thing := thing{number,&number,n,&n}<\/code> \u6709\u4e00\u4e2a\u53c2\u6570\u592a\u591a\u3002\u6211\u5047\u8bbe\u4f60\u7684\u610f\u601d\u662f thing := thing{number, n, &n}<\/code><\/p>\n
\u6ce8\u91ca#2\uff1a\u5305\u62ec \u5728\u5185\u7684 go \u5de5\u5177\u88ab\u8ba4\u4e3a\u662f\u8be5\u8bed\u8a00\u6700\u5f3a\u5927\u7684\u529f\u80fd\u4e4b\u4e00\u3002\u8bf7\u8003\u8651\u4f7f\u7528\u5b83\/\u3002<\/p>\n
\u7f16\u8f91\uff031\uff1a<\/strong> \u6211\u8ba4\u4e3a\u5b9e\u73b0 valuer<\/code> \u63a5\u53e3\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u6ca1\u6709\u4efb\u4f55\u4ef7\u503c\u3002<\/p>\n
\u4eca\u5929\u5173\u4e8e\u300a\u4f7f\u7528 sql null \u7c7b\u578b\u8fdb\u884c\u9a8c\u8bc1\u5668\uff1f\u300b\u7684\u5185\u5bb9\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\uff0c\u5982\u679c\u6709\u4ec0\u4e48\u7591\u95ee\u6216\u8005\u5efa\u8bae\uff0c\u53ef\u4ee5\u5728\u516c\u4f17\u53f7\u4e0b\u591a\u591a\u56de\u590d\u4ea4\u6d41\uff1b\u6587\u4e2d\u82e5\u6709\u4e0d\u6b63\u4e4b\u5904\uff0c\u4e5f\u5e0c\u671b\u56de\u590d\u7559\u8a00\u4ee5\u544a\u77e5\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5f53\u524d\u4f4d\u7f6e\uff1a > > ...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-207426","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207426","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=207426"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207426\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=207426"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=207426"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=207426"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}