方法一：
1.如果附加数据库时，没有指定逻辑名，则在SQL2005上显示为“全路径，且为大写”。比如，数据库文件D:MyTest.mdf和D:MyTest.ldf，附加到SQL服务器上时，如果没有指定逻辑名，则在SQL2005上显示为“D:MYTEST.MDF”。此时，C#的连接字符串为“DataSource=dsName;AttatchDBFilename=”D:\MyTest.mdf”;User ID=id;Password=pw”；
2.如果附加数据库时，指定了逻辑名，则在SQL2005上显示为“逻辑名”，此时，C#的连接字符串为“DataSource=dsName;AttatchDBFilename=”D:\MyTest.mdf”;Initial Catalog=aa_LogicName;User ID=id;Password=pw”；
3.被附加的数据库名称不可随意更改；否则容易出现错误。
方法二：
string DbPath=System.Environment.CurrentDirectory +@"\Demo_Data.MDF";
string LogPath=System.Environment.CurrentDirectory +@"\Demo_Log.LDF";
string StrSql="exec sp_attach_db @dbname='supmark',@filename1='"+DbPath+"',@filename2='"+LogPath+"'";
string strcon="Server=(local);Integrated Security=SSPI;Database=master";
SqlConnection cn=new SqlConnection(strcon);
SqlCommand cmd =new SqlCommand (StrSql,cn);
cn.Open();
cmd.ExecuteNonQuery();
cn.Close();
方法三详细代码：
using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Data.SqlClient;
using System.Data;
using System.ServiceProcess;
namespace AdminZJC.DataBaseControl
{
/// <summary>
/// 数据库操作控制类
/// </summary>
public class DataBaseControl
{
/// <summary>
/// 数据库连接字符串
/// </summary>
public string ConnectionString;
/// <summary>
/// SQL操作语句/存储过程
/// </summary>
public string StrSQL;
/// <summary>
/// 实例化一个数据库连接对象
/// </summary>
private SqlConnection Conn;
/// <summary>
/// 实例化一个新的数据库操作对象Comm
/// </summary>
private SqlCommand Comm;
/// <summary>
/// 要操作的数据库名称
/// </summary>
public string DataBaseName;
/// <summary>
/// 数据库文件完整地址
/// </summary>
public string DataBase_MDF;
/// <summary>
/// 数据库日志文件完整地址
/// </summary>
public string DataBase_LDF;
/// <summary>
/// 备份文件名
/// </summary>
public string DataBaseOfBackupName;
/// <summary>
/// 备份文件路径
/// </summary>
public string DataBaseOfBackupPath;
/// <summary>
/// 执行创建/修改数据库和表的操作
/// </summary>
public void DataBaseAndTableControl()
{
try
{
Conn = new SqlConnection(ConnectionString);
Conn.Open();
Comm = new SqlCommand();
Comm.Connection = Conn;
Comm.CommandText = StrSQL;
Comm.CommandType = CommandType.Text;
Comm.ExecuteNonQuery();
MessageBox.Show("数据库操作成功！", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
finally
{
Conn.Close();
}
}
/// <summary>
/// 附加数据库
/// </summary>
public void AddDataBase()
{
try
{
Conn = new SqlConnection(ConnectionString);
Conn.Open();
Comm = new SqlCommand();
Comm.Connection = Conn;
Comm.CommandText = "sp_attach_db";
Comm.Parameters.Add(new SqlParameter(@"dbname", SqlDbType.NVarChar));
Comm.Parameters[@"dbname"].Value = DataBaseName;
Comm.Parameters.Add(new SqlParameter(@"filename1", SqlDbType.NVarChar));
Comm.Parameters[@"filename1"].Value = DataBase_MDF;
Comm.Parameters.Add(new SqlParameter(@"filename2", SqlDbType.NVarChar));
Comm.Parameters[@"filename2"].Value = DataBase_LDF;
Comm.CommandType = CommandType.StoredProcedure;
Comm.ExecuteNonQuery();
MessageBox.Show("附加数据库成功", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
finally
{
Conn.Close();
}
}
/// <summary>
/// 分离数据库
/// </summary>
public void DeleteDataBase()
{
try
{
Conn = new SqlConnection(ConnectionString);
Conn.Open();
Comm = new SqlCommand();
Comm.Connection = Conn;
Comm.CommandText = @"sp_detach_db";
Comm.Parameters.Add(new SqlParameter(@"dbname", SqlDbType.NVarChar));
Comm.Parameters[@"dbname"].Value = DataBaseName;
Comm.CommandType = CommandType.StoredProcedure;
Comm.ExecuteNonQuery();
MessageBox.Show("分离数据库成功", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
finally
{
Conn.Close();
}
}
/// <summary>
/// 备份数据库
/// </summary>
public void BackupDataBase()
{
try
{
Conn = new SqlConnection(ConnectionString);
Conn.Open();
Comm = new SqlCommand();
Comm.Connection = Conn;
Comm.CommandText = "use master;backup database @dbname to disk = @backupname;";
Comm.Parameters.Add(new SqlParameter(@"dbname", SqlDbType.NVarChar));
Comm.Parameters[@"dbname"].Value = DataBaseName;
Comm.Parameters.Add(new SqlParameter(@"backupname", SqlDbType.NVarChar));
Comm.Parameters[@"backupname"].Value = @DataBaseOfBackupPath + @DataBaseOfBackupName;
Comm.CommandType = CommandType.Text;
Comm.ExecuteNonQuery();
MessageBox.Show("备份数据库成功", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
finally
{
Conn.Close();
}
}
/// <summary>
/// 还原数据库
/// </summary>
public void ReplaceDataBase()
{
try
{
string BackupFile = @DataBaseOfBackupPath + @DataBaseOfBackupName;
Conn = new SqlConnection(ConnectionString);
Conn.Open();
Comm = new SqlCommand();
Comm.Connection = Conn;
Comm.CommandText = "use master;restore database @DataBaseName From disk = @BackupFile with replace;";
Comm.Parameters.Add(new SqlParameter(@"DataBaseName", SqlDbType.NVarChar));
Comm.Parameters[@"DataBaseName"].Value = DataBaseName;
Comm.Parameters.Add(new SqlParameter(@"BackupFile", SqlDbType.NVarChar));
Comm.Parameters[@"BackupFile"].Value = BackupFile;
Comm.CommandType = CommandType.Text;
Comm.ExecuteNonQuery();
MessageBox.Show("还原数据库成功", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
finally
{
Conn.Close();
}
}
}
}
/*
///调用事例：
#----------------------------------------------------还原数据库---------------------------------------------------------#
private void button0_Click(object sender, EventArgs e)
{
DataBaseControl DBC = new DataBaseControl();
DBC.ConnectionString = "Data Source=(local);User id=sa;Password=123456; Initial Catalog=master";
DBC.DataBaseName = "MyDatabase";
DBC.DataBaseOfBackupName = @"back.bak";
DBC.DataBaseOfBackupPath = @"D:\Program Files\Microsoft SQL Server\MSSQL\Data\";
DBC.ReplaceDataBase();
}
#--------------------------------------------------附加数据库---------------------------------------------------------#
private void button1_Click_1(object sender, EventArgs e)
{
DataBaseControl DBC = new DataBaseControl();
DBC.ConnectionString = "Data Source=(local);User id=sa;Password=123456; Initial Catalog=master";
DBC.DataBaseName = "MyDatabase";
DBC.DataBase_MDF = @"D:\Program Files\Microsoft SQL Server\MSSQL\Data\MyDatabase_Data.MDF";
DBC.DataBase_LDF = @"D:\Program Files\Microsoft SQL Server\MSSQL\Data\MyDatabase_Log.LDF";
DBC.AddDataBase();
}
#--------------------------------------备份数据库--------------------------------------------------------------------#
private void button2_Click(object sender, EventArgs e)
{
DataBaseControl DBC = new DataBaseControl();
DBC.ConnectionString = "Data Source=(local);User id=sa;Password=123456; Initial Catalog=master";
DBC.DataBaseName = "MyDatabase";
DBC.DataBaseOfBackupName = @"back.bak";
DBC.DataBaseOfBackupPath = @"D:\Program Files\Microsoft SQL Server\MSSQL\Data\";
DBC.BackupDataBase();
}
#----------------------------------------分离数据库-----------------------------------------------------------------#
private void button3_Click(object sender, EventArgs e)
{
DataBaseControl DBC = new DataBaseControl();
DBC.ConnectionString = "Data Source=(local);User id=sa;Password=123456; Initial Catalog=master";
DBC.DataBaseName = "MyDatabase";
DBC.DeleteDataBase();
}