{"id":91649,"date":"2026-08-08T08:32:41","date_gmt":"2026-08-08T00:32:41","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/91649.html"},"modified":"2026-08-08T08:32:41","modified_gmt":"2026-08-08T00:32:41","slug":"%e4%bb%8e%e9%9b%b6%e6%89%93%e9%80%a0-c-%e5%b7%a5%e4%b8%9a%e8%a7%86%e8%a7%89%e6%a3%80%e6%b5%8b%e7%b3%bb%e7%bb%9f%ef%bc%88%e4%b9%9d%ef%bc%89%ef%bc%9a%e5%b7%a5%e5%8e%82%e6%a8%a1%e5%bc%8f%e5%ae%9e","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/91649.html","title":{"rendered":"\u4ece\u96f6\u6253\u9020 C# \u5de5\u4e1a\u89c6\u89c9\u68c0\u6d4b\u7cfb\u7edf\uff08\u4e5d\uff09\uff1a\u5de5\u5382\u6a21\u5f0f\u5b9e\u73b0 SQL Server \/ MySQL \/ SQLite \u4e09\u5e93\u5207\u6362"},"content":{"rendered":"<h2>\u4ece\u96f6\u6253\u9020 C# \u5de5\u4e1a\u89c6\u89c9\u68c0\u6d4b\u7cfb\u7edf&#xff08;\u4e5d&#xff09;&#xff1a;\u5de5\u5382\u6a21\u5f0f\u5b9e\u73b0 SQL Server \/ MySQL \/ SQLite \u4e09\u5e93\u5207\u6362<\/h2>\n<p>\u7cfb\u5217\u6807\u7b7e&#xff1a;C# \u5de5\u5382\u6a21\u5f0f ADO.NET SQL Server MySQL SQLite<br \/>\n\u672c\u6587\u76ee\u6807&#xff1a;\u638c\u63e1\u53ef\u6269\u5c55\u7684\u6570\u636e\u8bbf\u95ee\u5c42\u8bbe\u8ba1&#xff0c;\u5b9e\u73b0\u591a\u79cd\u6570\u636e\u5e93\u7684\u65e0\u7f1d\u5207\u6362<\/p>\n<hr \/>\n<h3>\u4e00\u3001\u524d\u8a00<\/h3>\n<p>\u5de5\u4e1a\u8f6f\u4ef6\u7684\u6570\u636e\u5e93\u9009\u578b\u53d7\u5ba2\u6237\u73b0\u573a\u73af\u5883\u5236\u7ea6&#xff1a;<\/p>\n<ul>\n<li>\u5927\u578b\u5de5\u5382\u5df2\u6709 SQL Server \u96c6\u7fa4&#xff0c;\u8981\u6c42\u6570\u636e\u7edf\u4e00\u5165\u5e93<\/li>\n<li>\u4e2d\u5c0f\u5ba2\u6237\u5e0c\u671b\u96f6\u6210\u672c\u90e8\u7f72&#xff0c;\u503e\u5411 MySQL<\/li>\n<li>\u5355\u673a\u8bbe\u5907\u6216\u5d4c\u5165\u5f0f\u573a\u666f&#xff0c;SQLite \u662f\u6700\u8f7b\u91cf\u7684\u9009\u62e9<\/li>\n<\/ul>\n<p>\u5982\u679c\u6bcf\u4e2a SQL \u8bed\u53e5\u90fd\u786c\u7f16\u7801 SqlConnection&#xff0c;\u5207\u6362\u6570\u636e\u5e93\u5c06\u662f\u4e00\u573a\u5669\u68a6\u3002\u672c\u6587\u5c06\u8be6\u89e3\u672c\u9879\u76ee\u4e2d\u7684 \u5de5\u5382\u6a21\u5f0f &#043; ADO.NET \u67b6\u6784\u3002<\/p>\n<hr \/>\n<h3>\u4e8c\u3001IDatabaseProvider \u63a5\u53e3\u8bbe\u8ba1<\/h3>\n<p>\u62bd\u8c61\u51fa\u6570\u636e\u5e93\u64cd\u4f5c\u7684\u4e09\u4e2a\u6700\u57fa\u672c\u52a8\u4f5c&#xff1a;<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">IDatabaseProvider<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token return-type class-name\">IDbConnection<\/span> <span class=\"token function\">CreateConnection<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\"><span class=\"token keyword\">string<\/span><\/span> connectionString<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token return-type class-name\">IDbCommand<\/span> <span class=\"token function\">CreateCommand<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\"><span class=\"token keyword\">string<\/span><\/span> query<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">IDbConnection<\/span> connection<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token return-type class-name\">IDbDataAdapter<\/span> <span class=\"token function\">CreateAdapter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">IDbCommand<\/span> command<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4f7f\u7528 IDbConnection\u3001IDbCommand \u7b49 ADO.NET \u57fa\u63a5\u53e3&#xff0c;\u800c\u975e\u5177\u4f53\u7c7b\u578b&#xff08;\u5982 SqlConnection&#xff09;&#xff0c;\u8fd9\u662f\u5b9e\u73b0\u8de8\u6570\u636e\u5e93\u7684\u5173\u952e\u3002<\/p>\n<hr \/>\n<h3>\u4e09\u3001\u4e09\u79cd\u6570\u636e\u5e93\u7684\u5b9e\u73b0<\/h3>\n<h4>3.1 SQL Server<\/h4>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">SqlServerProvider<\/span> <span class=\"token punctuation\">:<\/span> <span class=\"token type-list\"><span class=\"token class-name\">IDatabaseProvider<\/span><\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token return-type class-name\">IDbConnection<\/span> <span class=\"token function\">CreateConnection<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\"><span class=\"token keyword\">string<\/span><\/span> connectionString<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token constructor-invocation class-name\">SqlConnection<\/span><span class=\"token punctuation\">(<\/span>connectionString<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token return-type class-name\">IDbCommand<\/span> <span class=\"token function\">CreateCommand<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\"><span class=\"token keyword\">string<\/span><\/span> query<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">IDbConnection<\/span> connection<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token constructor-invocation class-name\">SqlCommand<\/span><span class=\"token punctuation\">(<\/span>query<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span>SqlConnection<span class=\"token punctuation\">)<\/span>connection<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token return-type class-name\">IDbDataAdapter<\/span> <span class=\"token function\">CreateAdapter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">IDbCommand<\/span> command<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token constructor-invocation class-name\">SqlDataAdapter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>SqlCommand<span class=\"token punctuation\">)<\/span>command<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>3.2 MySQL<\/h4>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MySqlProvider<\/span> <span class=\"token punctuation\">:<\/span> <span class=\"token type-list\"><span class=\"token class-name\">IDatabaseProvider<\/span><\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token return-type class-name\">IDbConnection<\/span> <span class=\"token function\">CreateConnection<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\"><span class=\"token keyword\">string<\/span><\/span> connectionString<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token constructor-invocation class-name\">MySqlConnection<\/span><span class=\"token punctuation\">(<\/span>connectionString<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token return-type class-name\">IDbCommand<\/span> <span class=\"token function\">CreateCommand<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\"><span class=\"token keyword\">string<\/span><\/span> query<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">IDbConnection<\/span> connection<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token constructor-invocation class-name\">MySqlCommand<\/span><span class=\"token punctuation\">(<\/span>query<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span>MySqlConnection<span class=\"token punctuation\">)<\/span>connection<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token return-type class-name\">IDbDataAdapter<\/span> <span class=\"token function\">CreateAdapter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">IDbCommand<\/span> command<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token constructor-invocation class-name\">MySqlDataAdapter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>MySqlCommand<span class=\"token punctuation\">)<\/span>command<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>3.3 SQLite<\/h4>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">SqliteProvider<\/span> <span class=\"token punctuation\">:<\/span> <span class=\"token type-list\"><span class=\"token class-name\">IDatabaseProvider<\/span><\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token return-type class-name\">IDbConnection<\/span> <span class=\"token function\">CreateConnection<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\"><span class=\"token keyword\">string<\/span><\/span> connectionString<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token constructor-invocation class-name\">SQLiteConnection<\/span><span class=\"token punctuation\">(<\/span>connectionString<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token return-type class-name\">IDbCommand<\/span> <span class=\"token function\">CreateCommand<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\"><span class=\"token keyword\">string<\/span><\/span> query<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">IDbConnection<\/span> connection<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token constructor-invocation class-name\">SQLiteCommand<\/span><span class=\"token punctuation\">(<\/span>query<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span>SQLiteConnection<span class=\"token punctuation\">)<\/span>connection<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token return-type class-name\">IDbDataAdapter<\/span> <span class=\"token function\">CreateAdapter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">IDbCommand<\/span> command<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token constructor-invocation class-name\">SQLiteDataAdapter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>SQLiteCommand<span class=\"token punctuation\">)<\/span>command<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<hr \/>\n<h3>\u56db\u3001SqlHelper&#xff1a;\u7edf\u4e00\u5165\u53e3<\/h3>\n<h4>4.1 \u521d\u59cb\u5316\u4e0e\u8fde\u63a5\u5b57\u7b26\u4e32\u6784\u5efa<\/h4>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">SqlHelper<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">IDatabaseProvider<\/span> _provider<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\"><span class=\"token keyword\">string<\/span><\/span> _connectionString<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token return-type class-name\"><span class=\"token keyword\">void<\/span><\/span> <span class=\"token function\">Initialize<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\"><span class=\"token keyword\">string<\/span><\/span> dbType<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\"><span class=\"token keyword\">string<\/span><\/span> server<span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token class-name\"><span class=\"token keyword\">string<\/span><\/span> database<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\"><span class=\"token keyword\">string<\/span><\/span> user<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\"><span class=\"token keyword\">string<\/span><\/span> password<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">DatabaseType<\/span> type <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>DatabaseType<span class=\"token punctuation\">)<\/span>Enum<span class=\"token punctuation\">.<\/span><span class=\"token function\">Parse<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">typeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token type-expression class-name\">DatabaseType<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> dbType<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        _connectionString <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">BuildConnectionString<\/span><span class=\"token punctuation\">(<\/span>type<span class=\"token punctuation\">,<\/span> server<span class=\"token punctuation\">,<\/span> database<span class=\"token punctuation\">,<\/span> user<span class=\"token punctuation\">,<\/span> password<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span>type<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">case<\/span> DatabaseType<span class=\"token punctuation\">.<\/span>SqlServer<span class=\"token punctuation\">:<\/span><br \/>\n                _provider <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token constructor-invocation class-name\">SqlServerProvider<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">case<\/span> DatabaseType<span class=\"token punctuation\">.<\/span>MySQL<span class=\"token punctuation\">:<\/span><br \/>\n                _provider <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token constructor-invocation class-name\">MySqlProvider<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">case<\/span> DatabaseType<span class=\"token punctuation\">.<\/span>SQLite<span class=\"token punctuation\">:<\/span><br \/>\n                _provider <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token constructor-invocation class-name\">SqliteProvider<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">default<\/span><span class=\"token punctuation\">:<\/span><br \/>\n                <span class=\"token keyword\">throw<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token constructor-invocation class-name\">ArgumentException<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Unsupported database type&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token return-type class-name\"><span class=\"token keyword\">string<\/span><\/span> <span class=\"token function\">BuildConnectionString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">DatabaseType<\/span> dbType<span class=\"token punctuation\">,<\/span> <span class=\"token range operator\">..<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span>dbType<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">case<\/span> DatabaseType<span class=\"token punctuation\">.<\/span>SqlServer<span class=\"token punctuation\">:<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> <span class=\"token interpolation-string\"><span class=\"token string\">$&#034;Server&#061;<\/span><span class=\"token interpolation\"><span class=\"token punctuation\">{<\/span><span class=\"token expression language-csharp\">server<\/span><span class=\"token punctuation\">}<\/span><\/span><span class=\"token string\">;Database&#061;<\/span><span class=\"token interpolation\"><span class=\"token punctuation\">{<\/span><span class=\"token expression language-csharp\">database<\/span><span class=\"token punctuation\">}<\/span><\/span><span class=\"token string\">;Uid&#061;<\/span><span class=\"token interpolation\"><span class=\"token punctuation\">{<\/span><span class=\"token expression language-csharp\">user<\/span><span class=\"token punctuation\">}<\/span><\/span><span class=\"token string\">;Password&#061;<\/span><span class=\"token interpolation\"><span class=\"token punctuation\">{<\/span><span class=\"token expression language-csharp\">password<\/span><span class=\"token punctuation\">}<\/span><\/span><span class=\"token string\">;&#034;<\/span><\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">case<\/span> DatabaseType<span class=\"token punctuation\">.<\/span>MySQL<span class=\"token punctuation\">:<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> <span class=\"token interpolation-string\"><span class=\"token string\">$&#034;Server&#061;<\/span><span class=\"token interpolation\"><span class=\"token punctuation\">{<\/span><span class=\"token expression language-csharp\">server<\/span><span class=\"token punctuation\">}<\/span><\/span><span class=\"token string\">;Database&#061;<\/span><span class=\"token interpolation\"><span class=\"token punctuation\">{<\/span><span class=\"token expression language-csharp\">database<\/span><span class=\"token punctuation\">}<\/span><\/span><span class=\"token string\">;Uid&#061;<\/span><span class=\"token interpolation\"><span class=\"token punctuation\">{<\/span><span class=\"token expression language-csharp\">user<\/span><span class=\"token punctuation\">}<\/span><\/span><span class=\"token string\">;Pwd&#061;<\/span><span class=\"token interpolation\"><span class=\"token punctuation\">{<\/span><span class=\"token expression language-csharp\">password<\/span><span class=\"token punctuation\">}<\/span><\/span><span class=\"token string\">;&#034;<\/span><\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">case<\/span> DatabaseType<span class=\"token punctuation\">.<\/span>SQLite<span class=\"token punctuation\">:<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> <span class=\"token interpolation-string\"><span class=\"token string\">$&#034;Data Source&#061;<\/span><span class=\"token interpolation\"><span class=\"token punctuation\">{<\/span><span class=\"token expression language-csharp\">database<\/span><span class=\"token punctuation\">}<\/span><\/span><span class=\"token string\">;Version&#061;3;&#034;<\/span><\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">default<\/span><span class=\"token punctuation\">:<\/span><br \/>\n                <span class=\"token keyword\">throw<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token constructor-invocation class-name\">ArgumentException<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Unsupported database type&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>4.2 \u8fde\u63a5\u7ba1\u7406<\/h4>\n<p><span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token return-type class-name\">IDbConnection<\/span> <span class=\"token function\">OpenConnection<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    _connection <span class=\"token operator\">&#061;<\/span> _provider<span class=\"token punctuation\">.<\/span><span class=\"token function\">CreateConnection<\/span><span class=\"token punctuation\">(<\/span>_connectionString<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>_connection<span class=\"token punctuation\">.<\/span>State <span class=\"token operator\">!&#061;<\/span> ConnectionState<span class=\"token punctuation\">.<\/span>Open<span class=\"token punctuation\">)<\/span><br \/>\n        _connection<span class=\"token punctuation\">.<\/span><span class=\"token function\">Open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> _connection<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token return-type class-name\"><span class=\"token keyword\">bool<\/span><\/span> <span class=\"token function\">ConnectTest<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">using<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\"><span class=\"token keyword\">var<\/span><\/span> conn <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">OpenConnection<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> _connection<span class=\"token punctuation\">.<\/span>State <span class=\"token operator\">&#061;&#061;<\/span> ConnectionState<span class=\"token punctuation\">.<\/span>Open<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>4.3 \u6267\u884c\u67e5\u8be2<\/h4>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token return-type class-name\">DataTable<\/span> <span class=\"token function\">GetDataTable<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\"><span class=\"token keyword\">string<\/span><\/span> sql<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">DataTable<\/span> dt <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token constructor-invocation class-name\">DataTable<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">try<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">using<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\"><span class=\"token keyword\">var<\/span><\/span> conn <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">OpenConnection<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">using<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\"><span class=\"token keyword\">var<\/span><\/span> cmd <span class=\"token operator\">&#061;<\/span> _provider<span class=\"token punctuation\">.<\/span><span class=\"token function\">CreateCommand<\/span><span class=\"token punctuation\">(<\/span>sql<span class=\"token punctuation\">,<\/span> conn<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token class-name\"><span class=\"token keyword\">var<\/span><\/span> adapter <span class=\"token operator\">&#061;<\/span> _provider<span class=\"token punctuation\">.<\/span><span class=\"token function\">CreateAdapter<\/span><span class=\"token punctuation\">(<\/span>cmd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                <span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span>_provider<span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token keyword\">case<\/span> <span class=\"token class-name\">SqlServerProvider<\/span> _<span class=\"token punctuation\">:<\/span><br \/>\n                        <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>SqlDataAdapter<span class=\"token punctuation\">)<\/span>adapter<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">Fill<\/span><span class=\"token punctuation\">(<\/span>dt<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">case<\/span> <span class=\"token class-name\">MySqlProvider<\/span> _<span class=\"token punctuation\">:<\/span><br \/>\n                        <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>MySqlDataAdapter<span class=\"token punctuation\">)<\/span>adapter<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">Fill<\/span><span class=\"token punctuation\">(<\/span>dt<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">case<\/span> <span class=\"token class-name\">SqliteProvider<\/span> _<span class=\"token punctuation\">:<\/span><br \/>\n                        <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>SQLiteDataAdapter<span class=\"token punctuation\">)<\/span>adapter<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">Fill<\/span><span class=\"token punctuation\">(<\/span>dt<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Exception<\/span> ex<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        MessageBox<span class=\"token punctuation\">.<\/span><span class=\"token function\">Show<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6267\u884c SQL \u5f02\u5e38: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> ex<span class=\"token punctuation\">.<\/span><span class=\"token function\">ToString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> dt<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>4.4 \u6267\u884c\u975e\u67e5\u8be2<\/h4>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token return-type class-name\"><span class=\"token keyword\">int<\/span><\/span> <span class=\"token function\">ExecuteNonQuery<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\"><span class=\"token keyword\">string<\/span><\/span> sql<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\"><span class=\"token keyword\">int<\/span><\/span> rowsAffected <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">try<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">using<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\"><span class=\"token keyword\">var<\/span><\/span> conn <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">OpenConnection<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">using<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\"><span class=\"token keyword\">var<\/span><\/span> cmd <span class=\"token operator\">&#061;<\/span> _provider<span class=\"token punctuation\">.<\/span><span class=\"token function\">CreateCommand<\/span><span class=\"token punctuation\">(<\/span>sql<span class=\"token punctuation\">,<\/span> conn<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">{<\/span><br \/>\n                rowsAffected <span class=\"token operator\">&#061;<\/span> cmd<span class=\"token punctuation\">.<\/span><span class=\"token function\">ExecuteNonQuery<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Exception<\/span> ex<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        MessageBox<span class=\"token punctuation\">.<\/span><span class=\"token function\">Show<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6267\u884c SQL \u5f02\u5e38: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> ex<span class=\"token punctuation\">.<\/span><span class=\"token function\">ToString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> rowsAffected<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<hr \/>\n<h3>\u4e94\u3001\u6570\u636e\u5e93\u8868\u521b\u5efa<\/h3>\n<p>CreateTableSql.cs \u4e2d\u5b9a\u4e49\u4e86\u5efa\u8868\u8bed\u53e5&#xff08;SQL Server \u8bed\u6cd5&#xff09;&#xff1a;<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\"><span class=\"token keyword\">string<\/span><\/span> createProductSql <span class=\"token operator\">&#061;<\/span><br \/>\n    <span class=\"token string\">&#034;IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id &#061; OBJECT_ID(N&#039;dbo.Product&#039;)) &#034;<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n    <span class=\"token string\">&#034;BEGIN &#034;<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n    <span class=\"token string\">&#034;CREATE TABLE dbo.Product (&#034;<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n    <span class=\"token string\">&#034;id int identity(1,1) primary key NOT NULL, &#034;<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n    <span class=\"token string\">&#034;product_name nvarchar(50) NOT NULL, &#034;<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n    <span class=\"token string\">&#034;product_type int NOT NULL, &#034;<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n    <span class=\"token string\">&#034;product_length decimal(18,1) NOT NULL, &#034;<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n    <span class=\"token string\">&#034;length_up_offset decimal(18,1) NOT NULL, &#034;<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n    <span class=\"token string\">&#034;length_down_offset decimal(18,1) NOT NULL, &#034;<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n    <span class=\"token string\">&#034;product_width decimal(18,1) NOT NULL, &#034;<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n    <span class=\"token string\">&#034;width_up_offset decimal(18,1) NOT NULL, &#034;<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n    <span class=\"token string\">&#034;width_down_offset decimal(18,1) NOT NULL, &#034;<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n    <span class=\"token string\">&#034;delay_time decimal(18,1) NOT NULL, &#034;<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n    <span class=\"token string\">&#034;hold_time decimal(18,1) NOT NULL, &#034;<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n    <span class=\"token string\">&#034;create_time datetime, &#034;<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n    <span class=\"token string\">&#034;update_time datetime); &#034;<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n    <span class=\"token string\">&#034;END&#034;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6ce8\u610f&#xff1a;SQLite \u548c MySQL \u7684\u5efa\u8868\u8bed\u6cd5\u7565\u6709\u4e0d\u540c&#xff0c;\u5b9e\u9645\u9879\u76ee\u4e2d\u9700\u8981\u6839\u636e dbType \u5207\u6362\u5bf9\u5e94\u7684 SQL\u3002<\/p>\n<hr \/>\n<h3>\u516d\u3001SQL \u6ce8\u5165\u9632\u8303<\/h3>\n<h4>6.1 \u5f53\u524d\u9879\u76ee\u7684\u98ce\u9669\u70b9<\/h4>\n<p>\u672c\u9879\u76ee\u4e3a\u4e86\u7b80\u5316&#xff0c;\u90e8\u5206 SQL \u91c7\u7528\u5b57\u7b26\u4e32\u62fc\u63a5&#xff1a;<\/p>\n<p><span class=\"token class-name\"><span class=\"token keyword\">string<\/span><\/span> deleteSql <span class=\"token operator\">&#061;<\/span> <span class=\"token interpolation-string\"><span class=\"token string\">$&#034;delete from Product where product_name &#061; &#039;<\/span><span class=\"token interpolation\"><span class=\"token punctuation\">{<\/span><span class=\"token expression language-csharp\">selectedLabel<span class=\"token punctuation\">.<\/span>Text<\/span><span class=\"token punctuation\">}<\/span><\/span><span class=\"token string\">&#039;&#034;<\/span><\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5982\u679c selectedLabel.Text \u5305\u542b &#039;&#xff0c;\u5c06\u5bfc\u81f4\u8bed\u6cd5\u9519\u8bef\u6216\u6ce8\u5165\u653b\u51fb\u3002<\/p>\n<h4>6.2 \u4fee\u590d\u65b9\u6848&#xff1a;\u53c2\u6570\u5316\u67e5\u8be2<\/h4>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token return-type class-name\"><span class=\"token keyword\">int<\/span><\/span> <span class=\"token function\">ExecuteNonQuerySafe<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\"><span class=\"token keyword\">string<\/span><\/span> sql<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">params<\/span> <span class=\"token class-name\">IDbDataParameter<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><\/span> parameters<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">using<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\"><span class=\"token keyword\">var<\/span><\/span> conn <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">OpenConnection<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">using<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\"><span class=\"token keyword\">var<\/span><\/span> cmd <span class=\"token operator\">&#061;<\/span> _provider<span class=\"token punctuation\">.<\/span><span class=\"token function\">CreateCommand<\/span><span class=\"token punctuation\">(<\/span>sql<span class=\"token punctuation\">,<\/span> conn<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">foreach<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\"><span class=\"token keyword\">var<\/span><\/span> param <span class=\"token keyword\">in<\/span> parameters<span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">{<\/span><br \/>\n                cmd<span class=\"token punctuation\">.<\/span>Parameters<span class=\"token punctuation\">.<\/span><span class=\"token function\">Add<\/span><span class=\"token punctuation\">(<\/span>param<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> cmd<span class=\"token punctuation\">.<\/span><span class=\"token function\">ExecuteNonQuery<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u8c03\u7528\u793a\u4f8b<\/span><br \/>\n<span class=\"token function\">ExecuteNonQuerySafe<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token string\">&#034;DELETE FROM Product WHERE product_name &#061; &#064;name&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">new<\/span> <span class=\"token constructor-invocation class-name\">SqlParameter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#064;name&#034;<\/span><span class=\"token punctuation\">,<\/span> selectedLabel<span class=\"token punctuation\">.<\/span>Text<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<hr 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