我希望我的应用程序连接到服务器并在其运行的任何PC上创建数据库。我有代码，但它只适用于我的计算机，而不适用于其他计算机，当我在其他计算机上运行它时，它将无法连接到该计算机服务器并且不会创建数据库
这是我的代码，我有启动画面形式，我希望，当应用程序运行时，检查该PC上是否存在数据库，以及是否不创建它。我的问题是，我的代码没有捕获服务器名称，只显示消息“服务器名称错误”
public partial class Splash : Form
{
public Splash()
{
InitializeComponent();
Properties.Settings.Default.Server = "(local)";
timer.Enabled = true;
}
private void CheckDatabase()
{
try
{
using (SqlConnection conn = Helper.ConnectionToServer())
{
if (Properties.Settings.Default.Server != string.Empty)
{
using (SqlCommand cmd = new SqlCommand(
"IF EXISTS (SELECT name FROM sys.databases WHERE name = 'MyDb') SELECT 1 ELSE SELECT 0",
conn))
{
conn.Open();
int value = (int)cmd.ExecuteScalar();
conn.Close();
if (value != 1)
{
MessageBox.Show("Database doesn't exist");
timer.Enabled = false;
CreateDatabase();
}
}
}
else
{
timer.Enabled = true;
}
}
}
catch
{
MessageBox.Show("Bad server name");
}
}
private void CreateDatabase()
{
string serverStr = "CREATE DATABASE [MyDb]";
string databaseStr = @"
CREATE TABLE [dbo].[Worker] (
[FirstName] NVARCHAR (50) NOT NULL,
[Password] NVARCHAR (50) NOT NULL,
[LastName] NVARCHAR (50) NOT NULL,
PRIMARY KEY CLUSTERED ([Password] ASC)
);
CREATE TABLE [dbo].[Article] (
[ItemName] NVARCHAR (50) NOT NULL,
[Barcode] NVARCHAR (50) NOT NULL,
[Price] MONEY NOT NULL,
CONSTRAINT [PK_Article] PRIMARY KEY CLUSTERED ([Barcode] ASC)
);";
using (SqlConnection conn = Helper.ConnectionToServer())
{
try
{
using (SqlCommand comm = new SqlCommand(serverStr, conn))
{
conn.Open();
comm.ExecuteNonQuery();
conn.Close();
}
}
catch
{
MessageBox.Show("Bad server name");
}
}
using (SqlConnection conn = Helper.ConnectionToDatabase())
{
using (SqlCommand comm = new SqlCommand(databaseStr, conn))
{
conn.Open();
comm.ExecuteNonQuery();
conn.Close();
timer.Enabled = true;
}
}
}
我还有一个帮助器类，每当我使用sql命令时都会使用它
class Helper
{
public static SqlConnection ConnectionToDatabase()
{
string con = string.Format(@"Data Source=DESKTOP-RFJ38NM;Initial Catalog=MyDb;Integrated Security=True", Properties.Settings.Default.Server);
return new SqlConnection(con);
}
public static SqlConnection ConnectionToServer()
{
string con = string.Format(@"Data Source=DESKTOP-RFJ38NM;Integrated Security=True", Properties.Settings.Default.Server);
return new SqlConnection(con);
}
}
答案 0 :(得分：1)
以下逻辑创建一个新数据库，即两个表。在前面我做了这个不是在初始形式，而是一个普通的形式，其中有一个部分我觉得应该是异步的，这是用于使用SmoApplication获取默认的SQL-Server实例名称，在那里你将添加对它的引用，在我的情况下这里有dll，你的计算机上有很多不同
C：\ Program Files \ Microsoft SQL Server \ 130 \ SDK \ Assemblies \ Microsoft.SqlServer.Smo.dll
在表单中有一个按钮和按钮的单击事件。单击时，代码将转移到一个单独的类，我将代码编组。
using System;
using System.Windows.Forms;
namespace StackOverFlow
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private async void button1_Click(object sender, EventArgs e)
{
var ops = await Operations.Create();
if (ops.FoundServerInstanceName)
{
if (ops.CheckDatabase())
{
MessageBox.Show("Ready to work with tables!!!");
}
else
{
if (ops.HasException)
{
MessageBox.Show($"Encountered the following issue(s)\n{ops.ExceptionMessage}");
}
else
{
MessageBox.Show("Failed");
}
}
}
}
}
}
在Operations类的顶部（下面）有几个属性
方法Initialize获取SQL-Server的实例名称。然后检查数据库是否存在，然后我们是否创建数据库和表。
为了构建这个，我正在使用VS2015，我在消息中利用字符串插值并设置属性。
希望这对当前任务有用。
using Microsoft.SqlServer.Management.Smo;
using System;
using System.Data;
using System.Data.Sql;
using System.Data.SqlClient;
using System.Threading.Tasks;
namespace StackOverFlow
{
public class Operations
{
string mExceptionMessage;
public string ExceptionMessage { get { return mExceptionMessage; } }
public bool HasException { get; set; }
bool _databaseExists = false;
bool mFoundServerInstanceName;
public bool FoundServerInstanceName { get { return mFoundServerInstanceName; } }
static string databaseServer;
static string masterDefaultCatalog = "Master";
string _masterConnectionString = $"Data Source={databaseServer};Initial Catalog={masterDefaultCatalog};Integrated Security=True";
string MasterConnectionString
{
get
{
return _masterConnectionString;
}
set
{
_masterConnectionString = value;
}
}
static string DefaultCatalog = "MyDb";
string _ConnectionString = $"Data Source={databaseServer};Initial Catalog={DefaultCatalog};Integrated Security=True";
string ConnectionString
{
get
{
return _ConnectionString;
}
set
{
_ConnectionString = value;
}
}
public static async Task<Operations> Create()
{
var ops = new Operations();
await ops.Initialize();
return ops;
}
async Task<bool> Initialize()
{
return await GetDefaultInstanceAsync();
}
public async Task<bool> GetDefaultInstanceAsync()
{
var serverInstanceTable = new DataTable();
try
{
await Task.Run(() => { serverInstanceTable = SmoApplication.EnumAvailableSqlServers(true); });
if (serverInstanceTable != null)
{
databaseServer = serverInstanceTable.Rows[0].Field<string>("name");
mFoundServerInstanceName = true;
}
else
{
mFoundServerInstanceName = false;
}
return true;
}
catch (Exception ex)
{
mExceptionMessage = ex.Message;
HasException = true;
return false;
}
}
/// <summary>
/// Determine if the database exists
/// </summary>
/// <returns></returns>
public bool CheckDatabase()
{
try
{
using (SqlConnection conn = new SqlConnection() { ConnectionString = MasterConnectionString })
{
using (SqlCommand cmd = new SqlCommand($"IF EXISTS (SELECT name FROM sys.databases WHERE name = '{DefaultCatalog}') SELECT 1 ELSE SELECT 0", conn))
{
conn.Open();
int value = (int)cmd.ExecuteScalar();
conn.Close();
if (value != 1)
{
CreateDatabase();
_databaseExists = true;
}
else
{
_databaseExists = true;
}
}
}
}
catch (Exception ex)
{
mExceptionMessage = ex.Message;
_databaseExists = false;
HasException = true;
}
return _databaseExists;
}
/// <summary>
/// create the database and two tables
/// </summary>
/// <returns></returns>
bool CreateDatabase()
{
string tableCreateScript = $@"
USE [{DefaultCatalog}]
CREATE TABLE [dbo].[Article](
[ItemName] [nvarchar](50) NOT NULL,
[Barcode] [nvarchar](50) NOT NULL,
[Price] [money] NOT NULL,
CONSTRAINT [PK_Article] PRIMARY KEY CLUSTERED
(
[Barcode] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY];
CREATE TABLE [dbo].[Worker](
[FirstName] [nvarchar](50) NOT NULL,
[Password] [nvarchar](50) NOT NULL,
[LastName] [nvarchar](50) NOT NULL,
PRIMARY KEY CLUSTERED
(
[Password] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY];";
using (SqlConnection conn = new SqlConnection() { ConnectionString = MasterConnectionString })
{
try
{
using (SqlCommand comm = new SqlCommand($"CREATE DATABASE [{DefaultCatalog}];", conn))
{
conn.Open();
comm.ExecuteNonQuery();
comm.CommandText = tableCreateScript;
comm.ExecuteNonQuery();
return true;
}
}
catch (Exception ex)
{
mExceptionMessage = ex.Message;
HasException = true;
return false;
}
}
}
}
}