/// <summary>
/// 根据数据库的逻辑名称创建Database实例
/// </summary>
/// <param name="name">数据库逻辑名称</param>
/// <returns>Database实例</returns>
public static Database Create(string name)
{
ExceptionHelper.CheckStringIsNullOrEmpty(name, "name");
//// 根据数据驱动名称对应的数据库实体
//// 如果以后需要开放DeluxeWorks.Db提供自动加载第三方Database类型的话，也仅需要修改这个方法
//switch (DbConnectionManager.GetDbProviderName(name))
//{
// case "System.Data.SqlClient":
// return new SqlDatabase(name);
// case "System.Data.OracleClient":
// return new OracleDatabase(name);
// //case "Oracle.DataAccess.Client":
// // return new ODP.OracleDatabase(name);
// default:
// throw new NotSupportedException(name + " 所定义的数据驱动不支持");
//}
return(DbConnectionManager.GetDataProvider(name) as Database);
}
/// <summary>
/// 根据名称得到当前引用的连接
/// </summary>
/// <param name="connName">数据库连接名称</param>
/// <returns>连接对象</returns>
protected ReferenceConnection GetRefConnectionWithoutTx(string connName)
{
ReferenceConnection result = null;
DoSafeConnectionOp(connName,
this.GraphWithoutTx,
(refConnection) =>
{
refConnection.ReferenceCount++;
result = refConnection;
},
() =>
{
DbConnection connection = DbConnectionManager.GetConnection(connName);
this._isConnectionCreator = true;
result = new ReferenceConnection(connName, connection);
this.GraphWithoutTx.Add(connName, result);
});
return(result);
}
/// <summary>
/// 获取一个DbContext对象
/// </summary>
/// <param name="name">连接名称</param>
/// <param name="autoClose">是否自动关闭</param>
/// <returns>DbContext对象</returns>
public static DbContext GetContext(string name, bool autoClose)
{
//得到映射后连接名称
name = DbConnectionMappingContext.GetMappedConnectionName(name);
DbProviderFactory factory = DbConnectionManager.GetDbProviderFactory(name);
DbConnectionStringBuilder csb = factory.CreateConnectionStringBuilder();
csb.ConnectionString = DbConnectionManager.GetConnectionString(name);
bool enlist = true;
if (csb.ContainsKey("enlist"))
{
enlist = (bool)csb["enlist"];
}
DbContext result = null;
if (enlist)
{
result = new AutoEnlistDbContext(name, autoClose);
}
else
{
result = new NotEnlistDbContext(name, autoClose);
}
result.InitDbContext(name, autoClose);
result._autoClose = autoClose;
result._commandTimeout = DbConnectionManager.GetCommandTimeout(name);
return(result);
}
private async Task <Tuple <DbConnection, bool> > CreateConnectionAsync(string name)
{
bool isConnectionCreator = false;
// non-transactional operation
GraphWithoutTransaction connections = this.GraphWithoutTx;
DbConnection connection = GetConnection(name);
if ((connection != null) && (connection.State != ConnectionState.Open))
{
if (connection.ConnectionString.IsNullOrEmpty())
{
connection.ConnectionString = DbConnectionManager.GetConnectionString(name);
}
await OpenConnectionAsync(name, connection);
WriteTraceInfo(connection.DataSource + "." + connection.Database
+ "[" + SNTPClient.AdjustedTime.ToString("yyyyMMdd HH:mm:ss.fff") + "]", " Open Connection ");
}
return(new Tuple <DbConnection, bool>(connection, isConnectionCreator));
}
/// <summary>
/// 根据名称得到当前引用的连接
/// </summary>
/// <param name="connName">数据库连接名称</param>
/// <returns>连接对象</returns>
protected ReferenceConnection GetRefConnectionWithoutTx(string connName)
{
ReferenceConnection refConnection = null;
GraphWithoutTransaction connections = this.GraphWithoutTx;
lock (connections)
{
if (connections.TryGetValue(connName, out refConnection) == false)
{
DbConnection connection = DbConnectionManager.GetConnection(connName);
this._isConnectionCreator = true;
refConnection = new ReferenceConnection(connName, connection);
connections.Add(connName, refConnection);
}
else
{
refConnection.ReferenceCount++;
}
}
return(refConnection);
}
