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 "cells": [
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   "source": [
    "连接数据库\n",
    "============================== "
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "连接到SQL Server,并操作数据。"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 引用操作类库"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
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     "language": "csharp"
    },
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     "kernelName": "csharp"
    }
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   "outputs": [
    {
     "data": {
      "text/html": [
       "<div><div></div><div></div><div><strong>Installed Packages</strong><ul><li><span>Microsoft.Dotnet.Interactive.SqlServer, 1.0.0-beta.23165.2</span></li></ul></div></div>"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/plain": [
       "Loading extensions from `C:\\Users\\ruyu\\.nuget\\packages\\microsoft.dotnet.interactive.sqlserver\\1.0.0-beta.23165.2\\interactive-extensions\\dotnet\\Microsoft.DotNet.Interactive.SqlServer.dll`"
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     "data": {
      "text/html": [
       "<details><summary>Query Microsoft SQL Server databases.</summary>\r\n",
       "<p>This extension adds support for connecting to Microsoft SQL Server databases using the <code>#!connect mssql</code> magic command. For more information, run a cell using the <code>#!sql</code> magic command.</p>\r\n",
       "</details>"
      ]
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   ],
   "source": [
    "#r \"nuget:Microsoft.Dotnet.Interactive.SqlServer,*-*\""
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 连接到SQL Server"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### 数据库连接命令"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### 命令概述: 使用帮助参数"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "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"
    }
   },
   "outputs": [],
   "source": [
    "#!connect -h"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### 连接到本机SQL Server"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "1. 建立连接"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "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"
    },
    "polyglot_notebook": {
     "kernelName": "csharp"
    }
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "Kernel added: #!sql-Demo"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "#!connect mssql \"server=.\\SQL2008;uid=sa;pwd=gly-bicijinlian;database=Study;Encrypt=True;TrustServerCertificate=True;\" --kernel-name Demo\n",
    "//重复执行会抛出错误，目前没有找到解决方法"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "2. 使用连接: 方式一"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "> 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": null,
   "metadata": {
    "dotnet_interactive": {
     "language": "sql-Demo"
    },
    "polyglot_notebook": {
     "kernelName": "sql-Demo"
    }
   },
   "outputs": [],
   "source": [
    "SELECT * from Student"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "2. 使用连接：方式二(推荐)"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "> 使用 `#!sql-Demo` ,后面直接写SQL语句，不用切换 kernel "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "dotnet_interactive": {
     "language": "csharp"
    },
    "polyglot_notebook": {
     "kernelName": "csharp"
    }
   },
   "outputs": [],
   "source": [
    "#!sql-Demo\n",
    "SELECT * from Student"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 使用 EF Core"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### 新连接: 添加 --create-dbcontext 参数"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "dotnet_interactive": {
     "language": "csharp"
    },
    "polyglot_notebook": {
     "kernelName": "csharp"
    }
   },
   "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"
    },
    {
     "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"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
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   ],
   "source": [
    "#!connect mssql \"server=.\\SQL2008;uid=sa;pwd=gly-bicijinlian;database=Study;Encrypt=True;TrustServerCertificate=True;\" --create-dbcontext --kernel-name DemoEF "
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "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"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### 使用EFCore连接: 操作数据"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### 类SQL脚本方式"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "dotnet_interactive": {
     "language": "csharp"
    },
    "polyglot_notebook": {
     "kernelName": "csharp"
    }
   },
   "outputs": [],
   "source": [
    "#!sql-DemoEF\n",
    "SELECT * from Student"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### C#程序中使用EF Core"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "dotnet_interactive": {
     "language": "csharp"
    },
    "polyglot_notebook": {
     "kernelName": "csharp"
    }
   },
   "outputs": [],
   "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.Students.ToList<Student>();\n",
    "display(t);\n",
    "\n",
    "FormattableString fs = $\"select * from Student;\";\n",
    "var c = context.Database.ExecuteSql(fs);\n",
    "display(c);"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "dotnet_interactive": {
     "language": "sql-DemoEF"
    },
    "polyglot_notebook": {
     "kernelName": "sql-DemoEF"
    }
   },
   "outputs": [],
   "source": [
    "#!sql-DemoEF\n",
    "\n",
    "var data = from "
   ]
  }
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