{
 "cells": [
  {
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   },
   "source": [
    "连接数据库\n",
    "==============================\n",
    "连接到SQL Server,并操作数据。 "
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "dotnet_interactive": {
     "language": "csharp"
    },
    "polyglot_notebook": {
     "kernelName": "csharp"
    }
   },
   "source": [
    "+ 引用操作类库"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "dotnet_interactive": {
     "language": "csharp"
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    "polyglot_notebook": {
     "kernelName": "csharp"
    },
    "vscode": {
     "languageId": "polyglot-notebook"
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   },
   "outputs": [],
   "source": [
    "#r \"nuget:Microsoft.Dotnet.Interactive.SqlServer,*-*\""
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {
    "dotnet_interactive": {
     "language": "csharp"
    },
    "polyglot_notebook": {
     "kernelName": "csharp"
    }
   },
   "source": [
    "+ 连接到SQL Server\n",
    "  > 数据库连接命令为 `#!connect` 查看连接帮助 `#!connect -h`"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "dotnet_interactive": {
     "language": "csharp"
    },
    "polyglot_notebook": {
     "kernelName": "csharp"
    },
    "vscode": {
     "languageId": "polyglot-notebook"
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   },
   "outputs": [],
   "source": [
    "#!connect -h\n"
   ]
  },
  {
   "attachments": {},
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    "dotnet_interactive": {
     "language": "csharp"
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   },
   "source": [
    "> 连接到本机SQL Server, 特别注意的是 --kernel-name 指定名称，后面的SQL操作均需要使用：sql-{{kernel-name}}的值\n",
    "> 比如 --kernel-name Demo, 则该SQL连接的kernel名称为 sql-Demo, 使用 #!sql-Demo 进行引用"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "dotnet_interactive": {
     "language": "csharp"
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    "polyglot_notebook": {
     "kernelName": "csharp"
    },
    "vscode": {
     "languageId": "polyglot-notebook"
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   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "Kernel added: #!sql-Demo"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "#!connect mssql \"server=.\\SQL2008;uid=sa;pwd=gly-bicijinlian;database=Demo;Encrypt=True;TrustServerCertificate=True;\" --kernel-name Demo\n",
    "\n",
    "//重复执行会抛出错误，目前没有找到解决方法\n"
   ]
  },
  {
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     "kernelName": "csharp"
    }
   },
   "source": [
    "+ 使用连接\n",
    "  一种方法是：在右下角，切换 Kernel, 由 `csharp - C# Script` 换成  由--kernel-name指定值生成的 `sql-Demo - T-SQL`"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "dotnet_interactive": {
     "language": "sql-Demo"
    },
    "polyglot_notebook": {
     "kernelName": "sql-Demo"
    },
    "vscode": {
     "languageId": "polyglot-notebook"
    }
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "(4 行受到影响)"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/csv": [
       "Id,Name,Age\r\n",
       "1,张三,20\r\n",
       "2,李四,30\r\n",
       "3,三丰,300\r\n",
       "4,小龙子,50\r\n"
      ],
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       "<table><thead><tr><td><span>Id</span></td><td><span>Name</span></td><td><span>Age</span></td></tr></thead><tbody><tr><td><div class=\"dni-plaintext\"><pre>1</pre></div></td><td>张三</td><td><div class=\"dni-plaintext\"><pre>20</pre></div></td></tr><tr><td><div class=\"dni-plaintext\"><pre>2</pre></div></td><td>李四</td><td><div class=\"dni-plaintext\"><pre>30</pre></div></td></tr><tr><td><div class=\"dni-plaintext\"><pre>3</pre></div></td><td>三丰</td><td><div class=\"dni-plaintext\"><pre>300</pre></div></td></tr><tr><td><div class=\"dni-plaintext\"><pre>4</pre></div></td><td>小龙子</td><td><div class=\"dni-plaintext\"><pre>50</pre></div></td></tr></tbody></table><style>\r\n",
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       "    white-space: nowrap;\r\n",
       "}\r\n",
       ".dni-treeview {\r\n",
       "    white-space: nowrap;\r\n",
       "}\r\n",
       ".dni-treeview td {\r\n",
       "    vertical-align: top;\r\n",
       "    text-align: start;\r\n",
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       "details.dni-treeview {\r\n",
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       "}\r\n",
       "table td {\r\n",
       "    text-align: start;\r\n",
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       "    vertical-align: top; \r\n",
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   "source": [
    "SELECT * from Test"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
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   "source": [
    "> 推荐的是下面的方法：即使用 `#!sql-Demo` ,后面直接写SQL语句，不用切换 kernel "
   ]
  },
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   "execution_count": 4,
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     "kernelName": "csharp"
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    "vscode": {
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   "outputs": [
    {
     "data": {
      "text/plain": [
       "(4 行受到影响)"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
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       "Id,Name,Age\r\n",
       "1,张三,20\r\n",
       "2,李四,30\r\n",
       "3,三丰,300\r\n",
       "4,小龙子,50\r\n"
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   "source": [
    "#!sql-Demo\n",
    "SELECT * from Test"
   ]
  },
  {
   "attachments": {},
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   "metadata": {
    "dotnet_interactive": {
     "language": "csharp"
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   },
   "source": [
    "## 使用 EF Core"
   ]
  },
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    "dotnet_interactive": {
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    }
   },
   "source": [
    "+ 新连接,添加 --create-dbcontext 参数"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "dotnet_interactive": {
     "language": "csharp"
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    "polyglot_notebook": {
     "kernelName": "csharp"
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    "vscode": {
     "languageId": "polyglot-notebook"
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   },
   "outputs": [
    {
     "data": {
      "text/markdown": [
       "Scaffolding a `DbContext` and initializing an instance of it called `DemoEF` in the C# kernel."
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/html": [
       "<div><div></div><div></div><div><strong>Installed Packages</strong><ul><li><span>Humanizer, 2.14.1</span></li><li><span>humanizer.core, 2.14.1</span></li><li><span>Microsoft.EntityFrameworkCore.Design, 7.0.0</span></li><li><span>microsoft.entityframeworkcore.sqlserver, 7.0.0</span></li><li><span>microsoft.identity.client, 4.48.1</span></li></ul></div></div>"
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     "output_type": "display_data"
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    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Security Warning: The negotiated TLS 1.0 is an insecure protocol and is supported for backward compatibility only. The recommended protocol version is TLS 1.2 and later.\r\n"
     ]
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     "data": {
      "text/plain": [
       "Kernel added: #!sql-DemoEF"
      ]
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   "source": [
    "#!connect mssql \"server=.\\SQL2008;uid=sa;pwd=gly-bicijinlian;database=Demo;Encrypt=True;TrustServerCertificate=True;\" --create-dbcontext --kernel-name DemoEF "
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {
    "dotnet_interactive": {
     "language": "csharp"
    },
    "polyglot_notebook": {
     "kernelName": "csharp"
    }
   },
   "source": [
    "上面的连接操作，会执行下面的任务：\n",
    "搭建EFCore基架,并初始化 DBContext 的实例: DemoEF\n",
    "安装包相关Nuget包,详情见输出\n",
    "添加新的子内核 #!sql-DemoEF"
   ]
  },
  {
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    "dotnet_interactive": {
     "language": "csharp"
    },
    "polyglot_notebook": {
     "kernelName": "csharp"
    }
   },
   "source": [
    "+ 使用EFCore连接，操作数据"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
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     "kernelName": "csharp"
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    "vscode": {
     "languageId": "polyglot-notebook"
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   "outputs": [
    {
     "data": {
      "text/plain": [
       "(4 行受到影响)"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
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       "Id,Name,Age\r\n",
       "1,张三,20\r\n",
       "2,李四,30\r\n",
       "3,三丰,300\r\n",
       "4,小龙子,50\r\n"
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   "source": [
    "#!sql-DemoEF\n",
    "SELECT * from Test"
   ]
  },
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   },
   "source": [
    "+ 程序中使用EF Core连接"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 35,
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     "language": "csharp"
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   },
   "outputs": [
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   "source": [
    "//连接建立后，执行环境中就有了相关的类：DBContext等\n",
    "DemoEFContext context = new DemoEFContext();\n",
    "var t = context.Tests.ToList<Test>();\n",
    "display(t);\n",
    "\n",
    "FormattableString fs = $\"select * from Test;\";\n",
    "var c = context.Database.ExecuteSql(fs);\n",
    "display(c);"
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