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C#数据库操作的用法

2019年07月18日  | 移动技术网IT编程  | 我要评论

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：

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。

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