C# ：创建SQL Server数据库、设置SQL Server数据库为只读状态、修改和压缩SQL Server数据库、新建（删除和修改）数据表、修改（新增和删除）数据列

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

using System.Data.SqlClient;

namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{//创建SQL Server数据库
string MySQL = "use master;" +
"IF DB_ID(N'MyDatabase') IS NOT NULL " +
"DROP DATABASE MyDatabase;" +
"CREATE DATABASE MyDatabase " +
"ON(NAME=MyDatabase_dat,FILENAME=\"C:\\MyDatabase.mdf\",SIZE=5,MAXSIZE=10,FILEGROWTH=1) " +
"LOG ON(NAME=MyDatabase_log,FILENAME=\"C:\\MyDatabase.ldf\",SIZE=2,MAXSIZE=5,FILEGROWTH=1)";
SqlConnection MyConnection = new SqlConnection("Data Source=.;Initial Catalog=;Integrated Security=True");
SqlCommand MyCommand = new SqlCommand(MySQL, MyConnection);
try
{
MyCommand.Connection.Open();
MyCommand.ExecuteNonQuery();
MessageBox.Show("成功创建数据库", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
finally
{
MyConnection.Close();
}
}

private void button2_Click(object sender, EventArgs e)
{//设置SQL Server数据库为只读状态
string MySQL = "use master; " +
"IF DB_ID(N'MyDatabase') IS NOT NULL " +
"EXEC sp_dboption 'MyDatabase', 'read only', 'TRUE'";
// "EXEC sp_dboption 'MyDatabase', 'read only', 'FALSE'";
SqlConnection MyConnection = new SqlConnection("Data Source=.;Initial Catalog=;Integrated Security=True");
SqlCommand MyCommand = new SqlCommand(MySQL, MyConnection);
try
{
MyCommand.Connection.Open();
MyCommand.ExecuteNonQuery();
MessageBox.Show("设置MyDatabase数据库为只读状态操作成功！", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
finally
{
MyConnection.Close();
}
}

private void button3_Click(object sender, EventArgs e)
{//设置SQL Server数据库为脱机状态
string MySQL = "use master; " +
"IF DB_ID(N'MyDatabase') IS NOT NULL " +
"EXEC sp_dboption 'MyDatabase', 'offline', 'TRUE'";
// "EXEC sp_dboption 'MyDatabase', 'offline', 'false'";
SqlConnection MyConnection = new SqlConnection("Data Source=.;Initial Catalog=;Integrated Security=True");
SqlCommand MyCommand = new SqlCommand(MySQL, MyConnection);
try
{
MyCommand.Connection.Open();
MyCommand.ExecuteNonQuery();
MessageBox.Show("设置MyDatabase数据库为脱机状态操作成功！", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
finally
{
MyConnection.Close();
}
}

private void button4_Click(object sender, EventArgs e)
{//修改SQL Server数据库
string MySQL = "use master;" +
"IF DB_ID(N'MyDatabase') IS NOT NULL " +
"ALTER DATABASE MyDatabase MODIFY FILE(NAME=MyDatabase_dat,SIZE=20)";
SqlConnection MyConnection = new SqlConnection("Data Source=.;Initial Catalog=;Integrated Security=True");
SqlCommand MyCommand = new SqlCommand(MySQL, MyConnection);
try
{
MyCommand.Connection.Open();
MyCommand.ExecuteNonQuery();
MessageBox.Show("成功修改数据库的文件尺寸", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
finally
{
MyConnection.Close();
}
}

private void button5_Click(object sender, EventArgs e)
{//压缩SQL Server数据库
string MySQL = "use master;" +
"IF DB_ID(N'MyDatabase') IS NOT NULL " +
"DBCC SHRINKDATABASE (MyDatabase, 90) ";
SqlConnection MyConnection = new SqlConnection("Data Source=.;Initial Catalog=;Integrated Security=True");
SqlCommand MyCommand = new SqlCommand(MySQL, MyConnection);
try
{
MyCommand.Connection.Open();
MyCommand.ExecuteNonQuery();
MessageBox.Show("成功压缩数据库", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
finally
{
MyConnection.Close();
}
}

private void button6_Click(object sender, EventArgs e)
{//在数据库中新建数据表
string MySQL ="IF OBJECT_ID(N'MyDatabase..商品清单', N'U') IS NOT NULL "+
"DROP TABLE 商品清单;" +
"CREATE TABLE 商品清单 ("+
"[货号] [char] (14) NOT NULL Primary Key,"+
"[条码] [char] (14) NULL ,"+
"[拼音编码] [char] (40) NULL,"+
"[品名] [varchar] (80) NULL ,"+
"[规格] [varchar] (40) NULL ,"+
"[单位] [char] (6) NOT NULL ,"+
"[产地] [varchar] (50) NULL ,"+
"[类别] [char] (20) NULL ,"+
"[进货价] [decimal] (28,6) NULL default(0),"+
"[销售价1] [decimal] (28,6) NULL default(0),"+
"[销售价2] [decimal] (28,6) NULL default(0),"+
"[最低售价] [decimal] (28,6) NULL default(0))";
SqlConnection MyConnection = new SqlConnection("Data Source = .;Database = MyDatabase;Integrated Security=SSPI");
SqlCommand MyCommand = new SqlCommand(MySQL, MyConnection);
try
{
MyCommand.Connection.Open();
MyCommand.ExecuteNonQuery();
MessageBox.Show("成功在MyDatabase数据库中创建数据表", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
finally
{
MyConnection.Close();
}
}

private void button7_Click(object sender, EventArgs e)
{//在数据库中删除数据表
string MySQL = "IF OBJECT_ID(N'MyDatabase..商品清单', N'U') IS NOT NULL " +
"DROP TABLE 商品清单;";
SqlConnection MyConnection = new SqlConnection("Data Source = .;Database = MyDatabase;Integrated Security=SSPI");
SqlCommand MyCommand = new SqlCommand(MySQL, MyConnection);
try
{
MyCommand.Connection.Open();
MyCommand.ExecuteNonQuery();
MessageBox.Show("成功在MyDatabase数据库中删除数据表", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
finally
{
MyConnection.Close();
}
}

private void button8_Click(object sender, EventArgs e)
{//在数据表中修改数据列
//"[产地] [varchar] (50) NULL ,"
string MySQL = "ALTER TABLE 商品清单 ALTER COLUMN [产地] [char](100) NOT NULL;";
SqlConnection MyConnection = new SqlConnection("Data Source = .;Database = MyDatabase;Integrated Security=SSPI");
SqlCommand MyCommand = new SqlCommand(MySQL, MyConnection);
try
{
MyCommand.Connection.Open();
MyCommand.ExecuteNonQuery();
MessageBox.Show("成功在“商品清单”数据表中修改数据列", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
finally
{
MyConnection.Close();
}
}

private void button9_Click(object sender, EventArgs e)
{//在数据表中添加数据列
string MySQL = "ALTER TABLE 商品清单 ADD [检验员] [varchar] (50) NULL;";
SqlConnection MyConnection = new SqlConnection("Data Source = .;Database = MyDatabase;Integrated Security=SSPI");
SqlCommand MyCommand = new SqlCommand(MySQL, MyConnection);
try
{
MyCommand.Connection.Open();
MyCommand.ExecuteNonQuery();
MessageBox.Show("成功在“商品清单”数据表中添加数据列", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
finally
{
MyConnection.Close();
}
}

private void button10_Click(object sender, EventArgs e)
{//在数据表中删除数据列
string MySQL = "ALTER TABLE 商品清单 DROP COLUMN [检验员] ;";
SqlConnection MyConnection = new SqlConnection("Data Source = .;Database = MyDatabase;Integrated Security=SSPI");
SqlCommand MyCommand = new SqlCommand(MySQL, MyConnection);
try
{
MyCommand.Connection.Open();
MyCommand.ExecuteNonQuery();
MessageBox.Show("成功在“商品清单”数据表中删除数据列", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
finally
{
MyConnection.Close();
}
}

private void button11_Click(object sender, EventArgs e)
{//删除指定数据表中的所有记录
string MySQL = "TRUNCATE TABLE 商品清单;";
SqlConnection MyConnection = new SqlConnection("Data Source = .;Database = MyDatabase;Integrated Security=SSPI");
SqlCommand MyCommand = new SqlCommand(MySQL, MyConnection);
try
{
MyCommand.Connection.Open();
MyCommand.ExecuteNonQuery();
MessageBox.Show("成功在“MyDatabase”数据库中删除“商品清单”数据表的所有记录", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
finally
{
MyConnection.Close();
}
}
}
}