/// <summary>
/// 使用若干参数初始化数据连接参数。
/// </summary>
/// <param name="Parameters">参数，包括DbProviderFactory(String类型表示的完整限定名称或DbProviderFactory类型)、DbAdapter(String类型表示的类型完整限定名称或DbAdapter类型)，及连接字符串(ConnectionString)或当前IDbAdapter.BuildConnectionString所需参数。</param>
/// <returns>初始化成功时，返回DbProvider，否则，返回null。</returns>
public static DbProvider Initialize(NameValueList Parameters)
{
DbConnection _conn = null;
DbProvider res = new DbProvider();
try
{
IDbAdapter DbAdapter = _getInstance <IDbAdapter>(Parameters["DbAdapter"]);
if (DbAdapter != null)
{
res._config["DbAdapter"] = DbAdapter;
DbAdapter.InitializeOptions(res.Options);
}
DbProviderFactory DbProviderFactory = _getInstance <DbProviderFactory>(Parameters["DbProviderFactory"]);
if (DbProviderFactory != null)
{
res._config["DbProviderFactory"] = DbProviderFactory;
}
else if (res.Options["DefaultDbProviderFactory"] != null)
{
res._config["DbProviderFactory"] = _getInstance <DbProviderFactory>(res.Options["DefaultDbProviderFactory"]);
}
if (Parameters["ConnectionString"] is string)
{
res._config["ConnectionString"] = Parameters["ConnectionString"];
}
else
{
res._config["ConnectionString"] = res.Adapter.BuildConnectionString(Parameters);
}
_conn = res.Provider.CreateConnection();
_conn.ConnectionString = res.ConnectionString;
_conn.Open();
res._config["DbSchema"] = res.Adapter.GetSchema(_conn);
if (Current == null)
{
Current = res;
}
return(res);
}
catch (Exception e)
{
#if DEBUG
DbConnectException dce = new DbConnectException(e, res._config);
Debug.WriteLine(dce);
throw dce;
#endif
return(null);
}
finally
{
try
{
_conn.Close();
}
catch { }
}
}
/// <summary>
/// 使用连接字符串、DbProviderFactory、DbAdapter初始化数据连接参数。
/// </summary>
/// <param name="ConnectionString">连接字符串</param>
/// <param name="DbProviderFactory">DbProviderFactory</param>
/// <param name="DbAdapter">DbAdapter</param>
/// <returns>初始化成功时，返回DbProvider，否则，返回null。</returns>
public static DbProvider Initialize(string ConnectionString, DbProviderFactory DbProviderFactory, IDbAdapter DbAdapter)
{
DbConnection _conn = null;
DbProvider res = new DbProvider();
try
{
if (DbAdapter != null)
{
res._config["DbAdapter"] = DbAdapter;
DbAdapter.InitializeOptions(res.Options);
}
if (DbProviderFactory != null)
{
res._config["DbProviderFactory"] = DbProviderFactory;
}
else if (res.Options["DefaultDbProviderFactory"] != null)
{
res._config["DbProviderFactory"] = _getInstance <DbProviderFactory>(res.Options["DefaultDbProviderFactory"]);
}
if (!string.IsNullOrEmpty(ConnectionString))
{
res._config["ConnectionString"] = ConnectionString;
}
_conn = res.Provider.CreateConnection();
_conn.ConnectionString = res.ConnectionString;
_conn.Open();
res._config["DbSchema"] = res.Adapter.GetSchema(_conn);
if (Current == null)
{
Current = res;
}
return(res);
}
catch (Exception e)
{
#if DEBUG
DbConnectException dce = new DbConnectException(e, res._config);
Debug.WriteLine(dce);
throw dce;
#endif
return(null);
}
finally
{
try
{
_conn.Close();
}
catch { }
}
}