{"id":171807,"date":"2024-11-07T07:49:16","date_gmt":"2024-11-06T23:49:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/171807\/"},"modified":"2024-11-07T07:49:17","modified_gmt":"2024-11-06T23:49:17","slug":"vb-%e5%a6%82%e4%bd%95%e9%80%b2%e8%a1%8c-sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e8%a9%a2%ef%bc%9f-vb-sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e8%a9%a2","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/171807\/","title":{"rendered":"VB \u5982\u4f55\u9032\u884c SQL \u6578\u64da\u5eab\u67e5\u8a62\uff1f (vb sql \u6578\u64da\u5eab\u67e5\u8a62)"},"content":{"rendered":"

VB \u5982\u4f55\u9032\u884c SQL \u6578\u64da\u5eab\u67e5\u8a62\uff1f<\/h1>\n

\u5728\u73fe\u4eca\u7684\u6578\u64da\u9a45\u52d5\u6642\u4ee3\uff0c\u6578\u64da\u5eab\u67e5\u8a62\u662f\u958b\u767c\u61c9\u7528\u7a0b\u5e8f\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\u3002Visual Basic\uff08VB\uff09\u4f5c\u70ba\u4e00\u7a2e\u6d41\u884c\u7684\u7de8\u7a0b\u8a9e\u8a00\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u8207 SQL \u6578\u64da\u5eab\u9032\u884c\u4ea4\u4e92\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728 VB \u4e2d\u9032\u884c SQL \u6578\u64da\u5eab\u67e5\u8a62\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n

1. \u4e86\u89e3 SQL \u6578\u64da\u5eab<\/h2>\n

SQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u4e00\u7a2e\u7528\u65bc\u7ba1\u7406\u548c\u64cd\u4f5c\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7684\u6a19\u6e96\u8a9e\u8a00\u3002\u5b83\u5141\u8a31\u7528\u6236\u57f7\u884c\u5404\u7a2e\u64cd\u4f5c\uff0c\u5982\u67e5\u8a62\u6578\u64da\u3001\u63d2\u5165\u6578\u64da\u3001\u66f4\u65b0\u6578\u64da\u548c\u522a\u9664\u6578\u64da\u3002\u5e38\u898b\u7684 SQL \u6578\u64da\u5eab\u5305\u62ec MySQL\u3001Microsoft SQL Server \u548c Oracle \u7b49\u3002<\/p>\n

2. \u5728 VB \u4e2d\u9023\u63a5 SQL \u6578\u64da\u5eab<\/h2>\n

\u5728\u9032\u884c SQL \u67e5\u8a62\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u5efa\u7acb\u8207\u6578\u64da\u5eab\u7684\u9023\u63a5\u3002\u9019\u901a\u5e38\u901a\u904e ADO.NET \u6216 OleDb \u4f86\u5be6\u73fe\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528 ADO.NET \u9023\u63a5 SQL Server \u6578\u64da\u5eab\u7684\u793a\u4f8b\uff1a<\/p>\n

Imports System.Data.SqlClient\n\nDim connectionString As String = \"Server=your_server;Database=your_database;User Id=your_username;Password=your_password;\"\nDim connection As New SqlConnection(connectionString)\n\nTry\n    connection.Open()\n    ' \u9023\u63a5\u6210\u529f\nCatch ex As Exception\n    ' \u8655\u7406\u9023\u63a5\u932f\u8aa4\nFinally\n    connection.Close()\nEnd Try<\/code><\/pre>\n
3. \u57f7\u884c SQL \u67e5\u8a62<\/h2>\n
\u4e00\u65e6\u6210\u529f\u9023\u63a5\u5230\u6578\u64da\u5eab\uff0c\u5c31\u53ef\u4ee5\u57f7\u884c SQL \u67e5\u8a62\u3002\u4ee5\u4e0b\u662f\u57f7\u884c SELECT \u67e5\u8a62\u7684\u793a\u4f8b\uff1a<\/p>\n
Dim command As New SqlCommand(\"SELECT * FROM your_table\", connection)\nDim reader As SqlDataReader\n\nTry\n    connection.Open()\n    reader = command.ExecuteReader()\n\n    While reader.Read()\n        Console.WriteLine(reader(\"column_name\").ToString())\n    End While\nCatch ex As Exception\n    ' \u8655\u7406\u67e5\u8a62\u932f\u8aa4\nFinally\n    reader.Close()\n    connection.Close()\nEnd Try<\/code><\/pre>\n
4. \u4f7f\u7528\u53c3\u6578\u5316\u67e5\u8a62<\/h2>\n
\u70ba\u4e86\u9632\u6b62 SQL \u6ce8\u5165\u653b\u64ca\uff0c\u5efa\u8b70\u4f7f\u7528\u53c3\u6578\u5316\u67e5\u8a62\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528\u53c3\u6578\u5316\u67e5\u8a62\u7684\u793a\u4f8b\uff1a<\/p>\n
Dim command As New SqlCommand(\"SELECT * FROM your_table WHERE column_name = @value\", connection)\ncommand.Parameters.AddWithValue(\"@value\", your_value)\n\nTry\n    connection.Open()\n    reader = command.ExecuteReader()\n\n    While reader.Read()\n        Console.WriteLine(reader(\"column_name\").ToString())\n    End While\nCatch ex As Exception\n    ' \u8655\u7406\u67e5\u8a62\u932f\u8aa4\nFinally\n    reader.Close()\n    connection.Close()\nEnd Try<\/code><\/pre>\n
5. \u8655\u7406\u67e5\u8a62\u7d50\u679c<\/h2>\n
\u67e5\u8a62\u7d50\u679c\u901a\u5e38\u4ee5 SqlDataReader \u7684\u5f62\u5f0f\u8fd4\u56de\u3002\u53ef\u4ee5\u4f7f\u7528\u8ff4\u5708\u4f86\u904d\u6b77\u7d50\u679c\u96c6\uff0c\u4e26\u6839\u64da\u9700\u8981\u8655\u7406\u6bcf\u4e00\u884c\u6578\u64da\u3002\u9664\u4e86 SELECT \u67e5\u8a62\uff0c\u9084\u53ef\u4ee5\u4f7f\u7528 INSERT\u3001UPDATE \u548c DELETE \u7b49 SQL \u8a9e\u53e5\u4f86\u4fee\u6539\u6578\u64da\u3002<\/p>\n
6. \u932f\u8aa4\u8655\u7406<\/h2>\n
\u5728\u9032\u884c\u6578\u64da\u5eab\u64cd\u4f5c\u6642\uff0c\u932f\u8aa4\u8655\u7406\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u4f7f\u7528 Try-Catch \u584a\u4f86\u6355\u7372\u548c\u8655\u7406\u53ef\u80fd\u51fa\u73fe\u7684\u7570\u5e38\uff0c\u78ba\u4fdd\u61c9\u7528\u7a0b\u5e8f\u7684\u7a69\u5b9a\u6027\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u5728 VB \u4e2d\u9032\u884c SQL \u6578\u64da\u5eab\u67e5\u8a62\u662f\u4e00\u500b\u76f8\u5c0d\u7c21\u55ae\u7684\u904e\u7a0b\uff0c\u53ea\u9700\u5efa\u7acb\u9023\u63a5\u3001\u57f7\u884c\u67e5\u8a62\u4e26\u8655\u7406\u7d50\u679c\u3002\u901a\u904e\u4f7f\u7528\u53c3\u6578\u5316\u67e5\u8a62\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u9632\u6b62 SQL \u6ce8\u5165\u653b\u64ca\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u5b89\u5168\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\u7a0b\u5e8f\uff0c\u9078\u64c7\u5408\u9069\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u53ef\u4ee5\u63d0\u4f9b\u66f4\u597d\u7684\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002\u7121\u8ad6\u662f\u958b\u767c\u5c0f\u578b\u61c9\u7528\u9084\u662f\u5927\u578b\u7cfb\u7d71\uff0c\u4e86\u89e3\u5982\u4f55\u9032\u884c SQL \u67e5\u8a62\u90fd\u662f\u4e00\u9805\u57fa\u672c\u6280\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3\u5982\u4f55\u5728 VB \u4e2d\u9032\u884c SQL \u6578\u64da\u5eab\u67e5\u8a62\uff0c\u638c\u63e1\u57fa\u672c\u8a9e\u6cd5\u548c\u64cd\u4f5c\u6280\u5de7\uff0c\u8f15\u9b06\u7ba1\u7406\u548c\u63d0\u53d6\u6578\u64da\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-171807","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/171807","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=171807"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/171807\/revisions"}],"predecessor-version":[{"id":171808,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/171807\/revisions\/171808"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=171807"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=171807"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=171807"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}