Question

我在连接到.sdf（sql compact edition）数据库时遇到了极大的麻烦。我最初可以连接以提取行以验证用户名/密码，但是当我尝试通过SqlCeConnection / SqlCeCommand命令或通过尝试添加项SqlClient / SqlCommand连接向数据库添加项时，我没有运气。我明白了：

A network-related or instance-specific error occurred while establishing 
a connection to SQL Server. The server was not found or was not accessible. 
Verify that the instance name is correct and that SQL Server is configured to 
allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error 
Locating Server/Instance Specified)

使用时：

private void button1_Click_1(object sender, EventArgs e)
{
    System.Data.SqlClient.SqlConnection sqlConnection1 =
    new System.Data.SqlClient.SqlConnection("Data Source=C:\\Users\\Tim\\Documents\\Visual Studio 2010\\Projects\\Dispatch POS\\Dispatch POS\\GhsDB.sdf");

    System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand();
    cmd.CommandType = System.Data.CommandType.Text;
    cmd.CommandText = "INSERT [Employee Table] (SSN, FirstName) VALUES ('555-23-4322', 'Tim')";
    cmd.Connection = sqlConnection1;

    sqlConnection1.Open();
    cmd.ExecuteNonQuery();
    sqlConnection1.Close();
}

或当我尝试：

System.Data.SqlClient.SqlConnection sqlConnection1 =
            new System.Data.SqlClient.SqlConnection("Data Source=C:\\Users\\Tim\\Documents\\Visual Studio 2010\\Projects\\Dispatch POS\\Dispatch POS\\GhsDB.sdf");

            System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand();
            cmd.CommandType = System.Data.CommandType.Text;
            cmd.CommandText = "INSERT [Employee Table] (SSN, FirstName) VALUES ('555-23-4322', 'Tim')";
            cmd.Connection = sqlConnection1;

            sqlConnection1.Open();
            cmd.ExecuteNonQuery();
            sqlConnection1.Close();

没有任何反应，它似乎工作，直到我检查.sdf文件，看到没有添加任何内容。我没有安装SQL Server CE，虽然我安装了2008 R2（我正在处理其他人的项目）。

现在我并不担心安全漏洞，我只是想成功添加一条记录。任何帮助都会非常感激，因为我花了大约三四个小时来处理我认为需要大约20分钟的事情。

Answer 1

可能你现在已经找到了解决方案，但是如果你使用sdf文件，你应该添加一个对System.Data.SqlServerCe的引用，然后是：

SqlCeConnection sqlConnection1= new SqlCeConnection();
sqlConnection1.ConnectionString = "Data Source = C:\\Users\\Tim\\Documents\\Visual Studio 2010\\Projects\\Dispatch POS\\Dispatch POS\\GhsDB.sdf";

System.Data.SqlServerCe.SqlCeCommand cmd = System.Data.SqlServerCe.SqlCeCommand;
cmd.CommandType = System.Data.CommandType.Text;
cmd.CommandText = "INSERT [Employee Table] (SSN, FirstName) VALUES ('555-23-4322', 'Tim')";
cmd.Connection = sqlConnection1;

sqlConnection1.Open();
cmd.ExecuteNonQuery();
sqlConnection1.Close();

Answer 2

你最常使用sqlceconnection和sqlcecommand类。像这样：

        SqlCeConnection conn = new SqlCeConnection(connectionString);            
        SqlCeCommand cmd = conn.CreateCommand();
        conn.Open();

通过SqlConnection / SqlCeConnection连接到.sdf数据库的问题

2 个答案: