Question

我有一段专门用于创建多个表的代码，但它创建了第一个然后抛出异常的代码，但异常不包含任何内容，它是空白的。这是我的代码：

string connectionString = "DataSource=\"EventControl.sdf\"";
        SqlCeEngine en = new SqlCeEngine(connectionString);
        en.CreateDatabase();
        string createTable = "CREATE TABLE Login (userName nvarchar(50), UserType nvarchar(10), Salt nvarchar(100), Hash nvarchar(100))";
        string connection = "Data Source =\"EventControl.sdf\"";
        SqlCeConnection connexion = new SqlCeConnection(connection);
        SqlCeCommand table = new SqlCeCommand(createTable, connexion);
        try
        {
            connexion.Open();
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.ToString());
        }
        table.ExecuteNonQuery();
        connexion.Close();
        string createTable1 = "CREATE TABLE Logs (LogNo nvarchar(5), LoggedBy nvarchar(20), DateAndTime nvarchar(20), Callsign nvarchar(20), Category nvarchar(20), SubCategory nvarchar(20), Escalated nvarchar(15), Summary nvarchar(MAX), Complete nvarchar(10))";
        string connection1 = "Data Source =\"EventControl.sdf\"";
        SqlCeConnection connexion1 = new SqlCeConnection(connection1);
        SqlCeCommand table1 = new SqlCeCommand(createTable1, connexion1);
        try
        {
            connexion1.Open();
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.ToString());
        }
        table1.ExecuteNonQuery();
        connexion1.Close();
        string createTable2 = "CREATE TABLE Sites (SiteName nvarchar(100),SiteAddress nvarchar(100),PersonInCharge nvarchar(100))";
        string connection2 = "Data Source =\"EventControl.sdf\"";
        SqlCeConnection connexion2 = new SqlCeConnection(connection2);
        SqlCeCommand table2 = new SqlCeCommand(createTable2, connexion2);
        try
        {
            connexion2.Open();
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.ToString());
        }
        table2.ExecuteNonQuery();
        connexion2.Close();
        string createTable3 = "CREATE TABLE Categories (Category nvarchar(50), SubCategory nvarchar(50))";
        string connection3 = "Data Source =\"EventControl.sdf\"";
        SqlCeConnection connexion3 = new SqlCeConnection(connection3);
        SqlCeCommand table3 = new SqlCeCommand(createTable3, connexion3);
        try
        {
            connexion3.Open();
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.ToString());
        }
        table3.ExecuteNonQuery();
        connexion3.Close();
        string createTable4 = "CREATE TABLE Callsigns (StaffName nvarchar (50), Callsign nvarchar(50))";
        string connection4 = "Data Source =\"EventControl.sdf\"";
        SqlCeConnection connexion4 = new SqlCeConnection(connection4);
        SqlCeCommand table4 = new SqlCeCommand(createTable4, connexion4);
        try
        {
            connexion4.Open();
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.ToString());
        }
        table4.ExecuteNonQuery();
        connexion4.Close();
        string createTable5 = "CREATE TABLE Events (EventName nvarchar(100), EventLocation nvarchar(100), PersonInCharge nvarchar(100))";
        string connection5 = "Data Source =\"EventControl.sdf\"";
        SqlCeConnection connexion5 = new SqlCeConnection(connection5);
        SqlCeCommand table5 = new SqlCeCommand(createTable5, connexion5);
        try
        {
            connexion5.Open();
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.ToString());
        }
        table5.ExecuteNonQuery();
        connexion5.Close();

它到达table1.ExecuteNonQuery然后停止。任何人都可以帮忙??

PS和之前有人说为什么不只是在VS中创建数据库，因为我已经尝试过了，并且它们在我的计算机上工作正常但是当我创建用于部署的安装文件时，文件夹全部搞砸了并且程序不会再认识一下数据库

Answer 1

将table1中的MAX值更改为4000

Answer 2

SQl Server Compact不支持数据类型nvarchar（MAX），而是使用ntext：

Summary ntext,

Answer 3

SqlCeEngine engine = new SqlCeEngine("Data Source = AdventureWorks.sdf");
engine.Compact(null);
//you need add a user and a password to acess the database 
engine.Compact("Data Source=; Password =a@3!7f$dQ;");

http://msdn.microsoft.com/pt-br/library/system.data.sqlserverce.sqlceengine.compact(v=vs.100).aspx http://msdn.microsoft.com/en-us/library/tk883fc7(v=vs.100).aspx

sql只创建一个表

3 个答案: