csharp
database
linux
<ItemGroup>
<PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
</ItemGroup>
<ItemGroup Condition="'$(TargetFramework)' == 'net45'">
<PackageReference Include="System.Runtime.InteropServices.RuntimeInformation" Version="4.3.0" />
</ItemGroup>
BinaryFormatter serialization and deserialization are disabled within this application
暂时解决办法（等 Oracle 更新会修复）
<PropertyGroup>
<TargetFramework>net5.0</TargetFramework>
<EnableUnsafeBinaryFormatterSerialization>true</EnableUnsafeBinaryFormatterSerialization>
</PropertyGroup>
https://stackoverflow.com/questions/64790197/odp-net-driver-throwing-exception-on-net-core-5-0
2021-05-13 更新：Oracle.EntityFrameworkCore v5.21.1 已经修复该问题
var dbc = new OracleCommand ();
dbc.InitialLONGFetchSize = -1;
https://stackoverflow.com/questions/3699143/selecting-the-default-value-of-an-oracle-column-in-net
依赖 System.Drawing.Common 包，该包在 Linux 上需要 GDI (libgdiplus) 组件
Data Source=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=127.0.0.1)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=ORCL)));User Id=sys;Password=oracle;DBA Privilege=SYSDBA;
https://www.connectionstrings.com/oracle/
using System;
public class Program
{
public static void Main ()
{
Method (1, 2, (sum, str) =>
{
Console.WriteLine (sum);
Console.WriteLine (str);
});
}
public static void Method (int v1, int v2, Action<int, string> actionCallback)
{
var sum = v1 + v2;
actionCallback (sum, "hello world");
}
}
/// <summary>
/// 连接包装（无返回值）
/// </summary>
/// <param name="action"></param>
public void SafeConn (Action action)
{
SafeConn (() => { action (); return 0; });
}
/// <summary>
/// 连接包装（有返回值）
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="action"></param>
/// <returns></returns>
public T SafeConn<T>(Func<T> action)
{
try
{
if (Connection.State == ConnectionState.Closed)
{
Connection.Open ();
}
return action ();
}
catch (Exception ex)
{
Transaction?.Rollback ();
Console.WriteLine (ex);
throw;
}
finally
{
Transaction?.Dispose ();
if (Connection.State == ConnectionState.Open)
{
Connection.Close ();
}
}
}
// 使用
public int SqlExecute (string sql, DbParameter [] parameters = null)
{
return SafeConn (() =>
{
var num = GetCommand (sql, parameters).ExecuteNonQuery ();
return num;
});
}
https://stackoverflow.com/questions/6046382/suggestions-for-making-a-reusable-try-catch-block-in-c
有可能是 ASP.NET State Service 服务没有启动，设置为自动启动
有可能是 ** 死循环 ** 造成（事件查看器有错误级别日志：w3wp.exe clr.dll 之类的错误）
不支持使用 Contains 搜索 nvarchar (max) 类型
https://github.com/dotnet/efcore/issues/19327
SELECT concat ('1', CHAR (10), '2')
SET SESSION group_concat_max_len = 1000000;
开启允许本地导入数据的配置
SET GLOBAL local_infile=1; -- 1 表示开启，0 表示关闭
SHOW VARIABLES LIKE '% local%'; -- 查看配置
连接字符串追加 AllowLoadLocalInfile=true
数据库和应用不在同一台服务器需要设置 MySqlBulkLoader 的 Local = true
% AppData%\NuGet\NuGet.Config 创建或编辑配置文件，配置以下信息
<configuration>
<config>
<add key="globalPackagesFolder" value="E:\package\nuget" />
</config>
</configuration>
参考：https://www.cnblogs.com/RainFate/p/12836146.html
打开工具栏：Database -> Edit Current DBMS
Profile\Column\Extended Attributes\National -- 勾选 Computed √
Host=127.0.0.1;Port=5432;Username=postgres;Password=123;Database=dbname;SslMode=Require;Trust Server Certificate=true;
连接字符串添加 SslMode=Require; 和 Trust Server Certificate=true;
参考：https://stackoverflow.com/questions/44161509
vi /root/.ssh/authorized_keys # 编辑，去除前面，保留 ssh-rsa 开头
Amazon EC2、Oracle Cloud 允许 root 登录
参考：https://askubuntu.com/questions/1156830
报错提示：证书链是由不受信任的颁发机构颁发的
连接字符串添加 TrustServerCertificate=True;