C#数据库基础教程

需积分: 9 147 浏览量更新于2024-07-19 收藏 7.46MB PDF 举报

"C# Database Basics 是一本由Michael Schmalz撰写的书籍，专注于介绍如何使用C#编程语言进行数据库操作。这本书于2012年由O'Reilly Media出版，主要面向英文读者。" 《C#数据库基础》是针对C#开发者入门数据库操作的一本指南。作者Michael Schmalz在书中详细阐述了如何利用C#这一强大编程语言与各种数据库系统进行交互。此书的内容可能涵盖以下几个关键知识点： 1. ADO.NET基础：ADO.NET是.NET Framework的一部分，提供了与数据库交互的API。书中可能介绍了连接数据库的基本步骤，如创建Connection对象，使用ConnectionString配置信息，以及打开和关闭数据库连接。 2. 数据库查询：C#通过SqlCommand对象执行SQL语句，包括SELECT、INSERT、UPDATE和DELETE等操作。作者可能会讲解如何构建这些命令，处理查询结果集，以及使用参数化查询防止SQL注入攻击。 3. 数据适配器和数据集（DataSet）：DataSet是一个离线数据存储，允许在内存中管理数据。书中可能讨论了如何使用DataAdapter填充DataSet，以及如何在DataSet和数据库之间同步数据。 4. 数据绑定：在C#中，可以将数据库数据绑定到UI控件，如DataGridView。这部分可能包含如何实现用户界面与数据库数据之间的实时更新。 5. LINQ（Language Integrated Query）：LINQ是C#的一项特性，使得查询数据更加直观。书中可能详细介绍了如何使用LINQ to SQL或LINQ to Entities，以及如何编写表达式树来执行数据库查询。 6.事务处理：在数据库操作中，事务处理确保了数据的完整性和一致性。书里可能会讲述如何在C#中使用TransactionScope来管理数据库事务，处理回滚和提交。 7. 错误处理和异常：在数据库操作中，处理错误和异常是至关重要的。作者可能讲解了如何使用try-catch块捕获和处理SqlException及其他相关异常。 8. 连接池：为了提高性能，数据库连接通常使用连接池。书中可能涉及如何配置和使用连接池，以及它对应用程序性能的影响。 9. 高级主题：高级话题可能包括存储过程、触发器、用户自定义函数的使用，以及如何进行多表联接和复杂查询。 10. 安全性：书中可能涵盖数据库访问的安全措施，如身份验证、权限管理和加密。 11. 最佳实践：作者可能会分享一些最佳实践，帮助开发者编写更高效、更安全的数据库代码。《C# Database Basics》是一本全面介绍C#数据库编程的书籍，适合想要深入理解如何在C#应用中操作数据库的初学者和开发者。通过阅读这本书，读者可以学习到从基础的数据库连接到复杂的查询和事务处理的所有关键概念和技术。

First, open up Visual Studio and go to File→New Project. Pick Visual C# and select

Windows Forms Application. On the bottom of that dialog box, type in

EditingDatabaseTest and then click OK, as shown in Figure 1-4. Once you do that, you

will see the screen shown in Figure 1-5.

To start with, we’ll recreate more or less what Access does automatically when you

build a form. You will fill a grid with data, add buttons to filter the data, and have a

second grid that will let you choose different tables with which to populate the first

grid. In addition, you will be adding code to allow you to add, update, and delete rows

of data. While this seems pretty simple, you’ll see that there is some planning involved

to make this work.

Take a look at the toolbox on the left side of your screen. (If the toolbox isn’t there, go

to View→Toolbox to show it.) Take notice of the sections—you will be using controls

from the Common Controls and Data sections for this sample. On the form, drag on

a datagrid from the Data section, a text box from the Common Controls section, a

combo box from the Common Controls section, two buttons from the Common Con-

trols section, and a second datagrid from the Data section. When you add the datagrid,

you will get the popup dialog shown in Figure 1-6. For the first datagrid, leave the boxes

checked to add, update, and delete records. For the second datagrid, uncheck those

boxes. On both, leave the datasource as None. You can create a project datasource and

use it here, but we are going to start with programming the datasource because it will

give you more flexibility. You can lay out these controls however you’d like; you can

Figure 1-4. The New Project window

6 | Chapter 1: First Steps: Form with a Datagrid

connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data

Source=C:\\users\\michael\\documents\\Northwind 2007.accdb";

query = "SELECT * FROM Customers";

dAdapter = new OleDbDataAdapter(query, connString);

dTable = new DataTable();

cBuilder = new OleDbCommandBuilder(dAdapter);

cBuilder.QuotePrefix = "[";

cBuilder.QuoteSuffix = "]";

myDataView = dTable.DefaultView;

The connection string is very similar to what you would see in VBA. However, you

should notice the \\ in the path name. If you use a single \, you will get an unrecognized

escape sequence error. The query variable is a string that defines the Select statement

that you are using to access the data. The OleDbDataAdapter is the class that holds

the data commands and connection that you will use to fill the DataTable. The OleDb

CommandBuilder class generates the commands that reconcile changes that happen in a

DataTable and the connected database.

Since you are connecting to the Northwind Database, you need the QuotePrefix and

QuoteSuffix properties defined with the square brackets. This is because the Northwind

Database has spaces in the field names. If you try to update a cell in your datagrid that

has spaces in field names without these properties defined, you will get an error. You

can always trap that error, but it would make updating impossible in tables with spaces

in field names. If you don’t add these properties and your datasource doesn’t have

spaces in field names, you will still be able to run error-free. However, I recommend

always adding these lines just in case. Next, add the following lines of code to finish

up this first procedure:

dAdapter.Fill(dTable);

BindingSource bndSource = new BindingSource();

bndSource.DataSource = dTable;

this.dataGridView1.DataSource = bndSource;

for (int q = 0; q <= dataGridView1.ColumnCount - 1; q++)

{

this.comboBox1.Items.Add

(this.dataGridView1.Columns[q].HeaderText.ToString());

}

OleDbConnection xyz = new OleDbConnection(connString);

xyz.Open();

DataTable tbl = xyz.GetSchema("Tables");

dataGridView2.DataSource = tbl;

DataView tbl_dv = tbl.DefaultView;

You are accomplishing several things with this code. First, you are filling the Data

Table with the data in the data adapter. Then, you are creating a binding source for the

form. (The BindingSource class is part of the System.Windows.Forms namespace.) Then,

you are finally ready to set the datasource for the datagrid. Once you do this, the data

you selected will populate the grid.

10 | Chapter 1: First Steps: Form with a Datagrid

剩余107页未读，继续阅读

patrolman

粉丝: 2
资源: 2

C#数据库基础教程

C#数据库开发文档

请帮我找一些高质量的c#视觉开发教学视频

80-u0434-1_a_nv_items_basics

the basics of mri

mongodb basics中文书

adc_architectures_iii_sigma-delta_adc_basics.pdf

tcp_basics_08

python basics

最新资源