{"id":207618,"date":"2025-07-08T08:14:38","date_gmt":"2025-07-08T00:14:38","guid":{"rendered":"https:\/\/server.hk\/cnblog\/207618\/"},"modified":"2025-07-08T08:14:38","modified_gmt":"2025-07-08T00:14:38","slug":"sql-%e8%b7%b3%e8%bf%87-select-%e7%9a%84%e7%ac%ac%e4%b8%80%e4%b8%aa%e5%80%bc","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/207618\/","title":{"rendered":"SQL \u8df3\u8fc7 select \u7684\u7b2c\u4e00\u4e2a\u503c"},"content":{"rendered":"

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

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> SQL \u8df3\u8fc7 select \u7684\u7b2c\u4e00\u4e2a\u503c<\/span><\/p>\n

\u6765\u6e90\uff1astackoverflow<\/span>
\n2024-04-23 23:45:38<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u672c\u7bc7\u6587\u7ae0\u4e3b\u8981\u662f\u7ed3\u5408\u6211\u4e4b\u524d\u9762\u8bd5\u7684\u5404\u79cd\u7ecf\u5386\u548c\u5b9e\u6218\u5f00\u53d1\u4e2d\u9047\u5230\u7684\u95ee\u9898\u89e3\u51b3\u7ecf\u9a8c\u6574\u7406\u7684\uff0c\u5e0c\u671b\u8fd9\u7bc7\u300aSQL \u8df3\u8fc7 select \u7684\u7b2c\u4e00\u4e2a\u503c\u300b\u5bf9\u4f60\u6709\u5f88\u5927\u5e2e\u52a9\uff01\u6b22\u8fce\u6536\u85cf\uff0c\u5206\u4eab\u7ed9\u66f4\u591a\u7684\u9700\u8981\u7684\u670b\u53cb\u5b66\u4e60~<\/p>\n

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

\u6211\u4e0d\u786e\u5b9a\u4e3a\u4ec0\u4e48\u6211\u7684\u4ee3\u7801\u7701\u7565\u4e86 select \u8bed\u53e5\u4e2d\u6536\u5230\u7684\u7b2c\u4e00\u884c\u3002\u4ee3\u7801\u662f\uff1a<\/p>\n

func (s *sqlserver) findallproducts() (products []*product, err error) {\n    ctx, cancel := getcontext()\n    defer cancel()\n\n    rows, err := s.querycontext(ctx,\n        \"select productid, productname, pricecents, brandname from products\")\n    if err != nil {\n        return\n    }   \n    defer rows.close()\n    \n    for rows.next() {\n        product := new(product)\n        err = rows.scan(\n            &product.productid,\n            &product.productname,\n            &product.pricecents,\n            &product.brandname,\n            )\n        if err != nil {\n            return\n        }\n        products = append(products, product)\n    }\n    return\n}<\/pre>\n
\u8fd8\u6709\u4e00\u4e2a\u5355\u5143\u6d4b\u8bd5\uff0c\u5b83\u4f7f\u7528 go-sqlmock<\/code> \u6765\u63d0\u4f9b\u6d4b\u8bd5\u5b58\u50a8\u5e93\uff1a<\/p>\n
func TestProduct(t *testing.T) {\n    db, mock, err := sqlmock.New()\n    if err != nil {\n        require.NoError(t, err)\n    }\n    s := sqlserver{db}\n    defer s.Close()\n\n    product1 := &Product{\n        1,\n        \"soda\",\n        100,\n        \"prites\",\n    }\n    product2 := &Product{\n        60,\n        \"slurpee\",\n        400,\n        \"koce\",\n    }\n    product3 := &Product{\n        21,\n        \"borg\",\n        210,\n        \"ham\",\n    }\n\n    query := \"^insert into *\"\n    mock.ExpectExec(query).\n        WithArgs(product1.ProductID, product1.ProductName, product1.PriceCents, product1.BrandName).\n        WillReturnResult(sqlmock.NewResult(0, 1))\n\n    query = \"^insert into *\"\n    mock.ExpectExec(query).\n        WithArgs(product2.ProductID, product2.ProductName, product2.PriceCents, product2.BrandName).\n        WillReturnResult(sqlmock.NewResult(1, 1))\n\n    query = \"^insert into *\"\n    mock.ExpectExec(query).\n        WithArgs(product3.ProductID, product3.ProductName, product3.PriceCents, product3.BrandName).\n        WillReturnResult(sqlmock.NewResult(2, 1))\n\n    query = \"^select .+ from *\"\n    rows := sqlmock.NewRows([]string{\"productid\", \"productname\", \"pricecents\", \"brandname\"}).\n        AddRow(product1.ProductID, product1.ProductName, product1.PriceCents, product1.BrandName)\n    mock.ExpectQuery(query).\n        WithArgs(product1.ProductID).\n        WillReturnRows(rows)\n\n    query = \"^select .+ from *\"\n    rows.AddRow(product2.ProductID, product2.ProductName, product2.PriceCents, product2.BrandName)\n    rows.AddRow(product3.ProductID, product3.ProductName, product3.PriceCents, product3.BrandName)\n    mock.ExpectQuery(query).\n        WillReturnRows(rows)\n\n    err = s.InsertProduct(product1)\n    assert.NoError(t, err)\n\n    err = s.InsertProduct(product2)\n    assert.NoError(t, err)\n\n    err = s.InsertProduct(product3)\n    assert.NoError(t, err)\n\n    product, err := s.FindProductFromID(product1.ProductID)\n    assert.NoError(t, err)\n    assert.Equal(t, product1, product)\n\n    products, err := s.FindAllProducts()\n    assert.NoError(t, err)\n    assert.Len(t, products, 3)\n    assert.Equal(t, *product1, *products[0])\n    assert.Equal(t, *product2, *products[1])\n    assert.Equal(t, *product3, *products[2])\n\n    err = mock.ExpectationsWereMet()\n    assert.NoError(t, err)\n}<\/pre>\n
\u5c06\u4ea7\u54c1\u63d2\u5165\u8868\u4e2d\u5de5\u4f5c\u6b63\u5e38\uff0c\u4f46\u662f\u5f53\u6211\u5c1d\u8bd5\u4f7f\u7528 s.findallproducts<\/code> \u68c0\u7d22\u4ea7\u54c1\u65f6\uff0c\u8fd4\u56de\u7684\u4ea7\u54c1\u4e2d\u59cb\u7ec8\u7f3a\u5c11\u7b2c\u4e00\u4e2a\u4ea7\u54c1\uff08\u5bfc\u81f4 assert.len(t, products, 3)<\/code> \u5931\u8d25\uff09\u3002\u975e\u5e38\u611f\u8c22\u4efb\u4f55\u5e2e\u52a9\uff01<\/p>\n
\u7f16\u8f91\uff1a\u5173\u4e8e\u5728\u5c06\u503c\u626b\u63cf\u5230\u4ea7\u54c1\u4e2d\u4e4b\u524d\u8c03\u7528 rows.next()<\/code> \uff0c\u8fd9\u662f\u6587\u6863\u6240\u8bf4\u7684\u64cd\u4f5c\uff0c\u56e0\u4e3a\u6307\u9488\u5e94\u8be5\u5728\u7b2c\u4e00\u884c\u4e4b\u524d\u5f00\u59cb\u4e00\u4e2a\u7d22\u5f15\u3002\u4f46\u662f\uff0c\u6211\u5df2\u7ecf\u8c03\u8bd5\u4e86\u4ee3\u7801\uff0c\u95ee\u9898\u4f3c\u4e4e\u662f\u6307\u9488\u5f00\u59cb\u5411\u524d\u4e00\u4e2a\u4f4d\u7f6e\uff08\u6307\u5411\u7b2c\u4e00\u884c\uff09\u5e76\u8c03\u7528 rows.next()<\/code> \u5c06\u5176\u79fb\u52a8\u5230\u4e0b\u4e00\u884c\u3002\u6211\u5c1d\u8bd5\u5728\u521d\u59cb\u5316\u4ea7\u54c1\u540e\u79fb\u52a8\u6b64\u8bed\u53e5\uff0c\u4f46\u4ee3\u7801\u968f\u540e\u629b\u51fa\u9519\u8bef\uff1a \u6536\u5230\u610f\u5916\u9519\u8bef\uff1asql\uff1a\u626b\u63cf\u8c03\u7528\u4f46\u672a\u8c03\u7528 next<\/code><\/p>\n
\u7f16\u8f91 2\uff1a\u8fd9\u4f3c\u4e4e\u662f go-sqlmock<\/code> \u7684\u76f4\u63a5\u95ee\u9898\uff0c\u56e0\u4e3a\u5728\u771f\u5b9e\u7684 sql \u6570\u636e\u5e93\u4e0a\u6d4b\u8bd5\u540e\uff0c\u6570\u636e\u5e93\u6b63\u786e\u8fd4\u56de\u6240\u6709 3 \u884c\u3002<\/p>\n
 <\/p>\n
\u89e3\u51b3\u65b9\u6848<\/h2>\n
 <\/p>\n
\u53d1\u73b0\u9519\u8bef\uff0c\u56e0\u4e3a rows \u662f\u4e00\u4e2a\u6307\u9488\uff0c\u7531\u4e8e\u67d0\u79cd\u539f\u56e0 go-sqlmock<\/code> \u4fee\u6539\u4e86\u884c\u96c6\uff0c\u5bfc\u81f4\u5176\u4e2d\u7684\u539f\u59cb\u884c\u88ab\u5220\u9664\uff0c\u5e76\u4e14\u6bcf\u6b21\u8c03\u7528 willreturnrows<\/code> \u65f6\u90fd\u9700\u8981\u91cd\u7f6e\u3002\u4ee5\u4e0b\u90e8\u5206\u4ee3\u7801\uff1a<\/p>\n
query = \"^select .+ from *\"\n    rows.addrow(product2.productid, product2.productname, product2.pricecents, product2.brandname)\n    rows.addrow(product3.productid, product3.productname, product3.pricecents, product3.brandname)\n    mock.expectquery(query).\n        willreturnrows(rows)<\/pre>\n
\u5e94\u8be5\u4fee\u6539\u4ee5\u6dfb\u52a0\u539f\u59cb\u884c\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
query = \"^select .+ from *\"\n    rows = sqlmock.NewRows([]string{\"productid\", \"productname\", \"pricecents\", \"brandname\"})\n    rows.AddRow(product1.ProductID, product1.ProductName, product1.PriceCents, product2.BrandName)\n    rows.AddRow(product2.ProductID, product2.ProductName, product2.PriceCents, product2.BrandName)\n    rows.AddRow(product3.ProductID, product3.ProductName, product3.PriceCents, product3.BrandName)\n    mock.ExpectQuery(query).\n        WillReturnRows(rows)<\/pre>\n
\u6d4b\u8bd5\u73b0\u5728\u901a\u8fc7\u4e86\uff01<\/p>\n
\u597d\u4e86\uff0c\u672c\u6587\u5230\u6b64\u7ed3\u675f\uff0c\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u300aSQL \u8df3\u8fc7 select \u7684\u7b2c\u4e00\u4e2a\u503c\u300b\uff0c\u5e0c\u671b\u672c\u6587\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff01\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u7ed9\u5927\u5bb6\u5206\u4eab\u66f4\u591aGolang\u77e5\u8bc6\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-207618","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207618","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=207618"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207618\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=207618"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=207618"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=207618"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}