c# - SQL Server Compact 在未知数据类型上抛出异常？

Question

在 SQL Server Compact 版本中，如何在以编程方式创建数据库时定义整数？我试过了int，，，，它们都不起作用Int32，Bigint它们都抛出异常，说数据类型无效？

string createTable6 = "CREATE TABLE Gates (Gate1In Bigint(5), Gate1Out Bigint(5), Gate2In Bigint(5), Gate2Out Bigint(5), Gate3In Bigint(5), Gate3Out Bigint(5), Gate4In Bigint(5), Gate4Out Bigint(5), Gate5In Bigint(5), Gate5Out Bigint(5))";

SqlCeConnection connexion6 = new SqlCeConnection(connectionString);
SqlCeCommand table6 = new SqlCeCommand(createTable6, connexion6);

try
{
    connexion6.Open();
    table6.ExecuteNonQuery();
}
catch (Exception ex)
{
    MessageBox.Show(ex.ToString());
}

connexion6.Close();

Answer 1

bigint不用括号直接使用

string createTable6 = "CREATE TABLE Gates (Gate1In bigint, Gate1Out bigint, " + 
       "Gate2In bigint, Gate2Out bigint, Gate3In bigint, Gate3Out bigint, " + 
       "Gate4In bigint, Gate4Out bigint, Gate5In bigint, Gate5Out bigint)";

但是它也应该与int. 如果你真的不需要所有整数空间（8 个字节），你可以使用 int

Answer 2

这是数据类型声明后有括号的事实：

尝试这个：

string createTable6 = "CREATE TABLE Gates (Gate1In Bigint, Gate1Out Bigint, Gate2In Bigint, " + 
       "Gate2Out Bigint, Gate3In Bigint, Gate3Out Bigint, Gate4In Bigint, Gate4Out Bigint, " +
       "Gate5In Bigint, Gate5Out Bigint)";