PolyglotNotebooksStudy/Docs/多语言笔记.2.1.连接数据库.ipynb

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   "source": [
    "连接数据库\n",
    "============================== "
   ]
  },
  {
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   "source": [
    "连接到SQL Server,并操作数据。"
   ]
  },
  {
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 引用操作类库"
   ]
  },
  {
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   "source": [
    "#r \"nuget:Microsoft.Dotnet.Interactive.SqlServer,*-*\""
   ]
  },
  {
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   "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"
   ]
  },
  {
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   "source": [
    "数据库连接命令为 `#!connect` 查看连接帮助 `#!connect -h`"
   ]
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  {
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   "source": [
    "#!connect -h"
   ]
  },
  {
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### 连接到本机SQL Server"
   ]
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  {
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   "source": [
    "1. 建立连接"
   ]
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  {
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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"
   ]
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  {
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   "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"
   ]
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  {
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   "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"
   ]
  },
  {
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   "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 "
   ]
  },
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   "outputs": [],
   "source": [
    "#!sql-Demo\n",
    "SELECT * from Student"
   ]
  },
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   "source": [
    "## 使用 EF Core"
   ]
  },
  {
   "attachments": {},
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   "metadata": {},
   "source": [
    "### 新连接: 添加 --create-dbcontext 参数"
   ]
  },
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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 "
   ]
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   "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": {},
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   "metadata": {},
   "source": [
    "#### 类SQL脚本方式"
   ]
  },
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     "language": "csharp"
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   "outputs": [],
   "source": [
    "#!sql-DemoEF\n",
    "SELECT * from Student"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### C#程序中使用EF Core"
   ]
  },
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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.Students.ToList<Student>();\n",
    "display(t);\n",
    "\n",
    "FormattableString fs = $\"select * from Student;\";\n",
    "var c = context.Database.ExecuteSql(fs);\n",
    "display(c);"
   ]
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   "source": [
    "#!sql-DemoEF\n",
    "\n",
    "var data = from "
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