/// <summary>
/// Create <see cref="DbConnection"/> instance.
/// </summary>
/// <summary xml:lang="zh-CN">
/// 创建连接对象
/// </summary>
/// <param name="source"><see cref="Database"/></param>
/// <param name="connectString"></param>
/// <returns></returns>
public static DbConnection CreateDbConnection(Database source, string connectString)
{
DbProviderFactory factory;
switch (source)
{
case Database.MySql:
{
factory = DatabaseProviderFactories.GetFactory(DatabaseProviderFactories.MySqlProvider);
break;
}
case Database.SqlServer:
{
factory = DatabaseProviderFactories.GetFactory(DatabaseProviderFactories.SqlServerProvider);
break;
}
case Database.PostgreSql:
{
factory = DatabaseProviderFactories.GetFactory(DatabaseProviderFactories.PostgreSqlProvider);
break;
}
default:
{
throw new SpiderException($"Unsupported database: {source}");
}
}
for (int i = 0; i < 5; ++i)
{
try
{
var connection = factory.CreateConnection();
if (connection != null)
{
connection.ConnectionString = connectString;
connection.Open();
return(connection);
}
}
catch (Exception e)
{
if (e.Message.ToLower().StartsWith("authentication to host"))
{
Log.Logger.Error($"{e}");
Thread.Sleep(1000);
}
else
{
throw;
}
}
}
throw new SpiderException("Create connection failed");
}
/// <summary>
/// Create DbConnection from <see cref="ConnectionStringSettings"/>.
/// </summary>
/// <summary xml:lang="zh-CN">
/// 通过配置创建连接对象
/// </summary>
/// <param name="connectionStringSettings">数据库配置对象 <see cref="ConnectionStringSettings"/></param>
/// <returns>连接对象 <see cref="DbConnection"/></returns>
public static DbConnection CreateDbConnection(this ConnectionStringSettings connectionStringSettings)
{
if (connectionStringSettings == null)
{
throw new SpiderException("ConnectionStringSetting is null");
}
if (string.IsNullOrWhiteSpace(connectionStringSettings.ConnectionString) ||
string.IsNullOrWhiteSpace(connectionStringSettings.ProviderName))
{
throw new SpiderException("ConnectionStringSetting is incorrect");
}
var factory = DatabaseProviderFactories.GetFactory(connectionStringSettings.ProviderName);
for (int i = 0; i < 5; ++i)
{
try
{
DbConnection connection = factory.CreateConnection();
if (connection != null)
{
connection.ConnectionString = connectionStringSettings.ConnectionString;
if (connection.State == ConnectionState.Closed)
{
connection.Open();
}
return(connection);
}
}
catch (Exception e)
{
if (e.Message.ToLower().StartsWith("authentication to host"))
{
Log.Logger.Error($"{connectionStringSettings.ConnectionString}: {e}.");
break;
}
if (e.Message.ToLower().StartsWith("access denied for user"))
{
Log.Logger.Error($"Access denied: {connectionStringSettings.ConnectionString}.");
break;
}
else
{
Log.Logger.Warning($"{connectionStringSettings.ConnectionString}: {e}");
Thread.Sleep(1000);
}
}
}
return(null);
}