正文

C#数据库操作的用法

︶ㄣSDDLL学院 メ
SDDLL学院V管理员 / 阅读
0708
这篇文章主要介绍了C#数据库操作的三种经典用法

这篇文章主要介绍了C#数据库操作的三种经典用法

由于最近和数据库打交道，需要用C#和SQL Server 2005进行操作,就把近段时间内的最常用的操作做个总结。本人也是第一次用C#操作数据库，所以这三种典型用法对初学者还是挺有帮助的。

以下是我在visual studio 2005上写的一个类(连的是SQL Server 2005)，已经过测试通过。里面有3个方法比较典型，源码如下：

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.SqlClient;
namespace DatabaseOperate
{
class SqlOperateInfo
{
//Suppose your ServerName is "aa",DatabaseName is "bb",UserName is "cc", Password is "dd"
private string sqlConnectionCommand = "Data Source=aa;Initial Catalog=bb;User ID=cc;Pwd=dd";
//This table contains two columns:KeywordID int not null,KeywordName varchar(100) not null
private string dataTableName = "Basic_Keyword_Test";
private string storedProcedureName = "Sp_InertToBasic_Keyword_Test";
private string sqlSelectCommand = "Select KeywordID, KeywordName From Basic_Keyword_Test";
//sqlUpdateCommand could contain "insert" , "delete" , "update" operate
private string sqlUpdateCommand = "Delete From Basic_Keyword_Test Where KeywordID = 1";
public void UseSqlReader()
{
SqlConnection sqlConnection = new SqlConnection(sqlConnectionCommand);
SqlCommand sqlCommand = new SqlCommand();
sqlCommand.CommandType = System.Data.CommandType.Text;
sqlCommand.Connection = sqlConnection;
sqlCommand.CommandText = sqlSelectCommand;
sqlConnection.Open();
SqlDataReader sqlDataReader = sqlCommand.ExecuteReader();
while(sqlDataReader.Read())
{
//Get KeywordID and KeywordName , You can do anything you like. Here I just output them.
int keywordid = (int)sqlDataReader[0];
//the same as: int keywordid = (int)sqlDataReader["KeywordID"]
string keywordName = (string)sqlDataReader[1];
//the same as: string keywordName = (int)sqlDataReader["KeywordName"]
Console.WriteLine("KeywordID = " + keywordid + " , KeywordName = " + keywordName);
}
sqlDataReader.Close();
sqlCommand.Dispose();
sqlConnection.Close();
}
public void UseSqlStoredProcedure()
{
SqlConnection sqlConnection = new SqlConnection(sqlConnectionCommand);
SqlCommand sqlCommand = new SqlCommand();
sqlCommand.CommandType = CommandType.StoredProcedure;
sqlCommand.Connection = sqlConnection;
sqlCommand.CommandText = storedProcedureName;
sqlConnection.Open();
sqlCommand.ExecuteNonQuery();
//you can use reader here,too.as long as you modify the sp and let it like select * from ....
sqlCommand.Dispose();
sqlConnection.Close();
}
public void UseSqlDataSet()
{
SqlConnection sqlConnection = new SqlConnection(sqlConnectionCommand);
SqlCommand sqlCommand = new SqlCommand();
sqlCommand.CommandType = System.Data.CommandType.Text;
sqlCommand.Connection = sqlConnection;
sqlCommand.CommandText = sqlSelectCommand;
sqlConnection.Open();
SqlDataAdapter sqlDataAdapter = new SqlDataAdapter();
sqlDataAdapter.SelectCommand = sqlCommand;
DataSet dataSet = new DataSet();
//sqlCommandBuilder is for update the dataset to database
SqlCommandBuilder sqlCommandBuilder = new SqlCommandBuilder(sqlDataAdapter);
sqlDataAdapter.Fill(dataSet, dataTableName);
//Do something to dataset then you can update it to 　Database.Here I just add a row
DataRow row = dataSet.Tables[0].NewRow();
row[0] = 10000;
row[1] = "new row";
dataSet.Tables[0].Rows.Add(row);
sqlDataAdapter.Update(dataSet, dataTableName);
sqlCommand.Dispose();
sqlDataAdapter.Dispose();
sqlConnection.Close();
}
}
}

以上的程序概括了最典型的用法，也是最基本的用法。

希望通过本文的介绍，能给你带来帮助，学会C#数据库操作的用法。