/// <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.autoClose = autoClose;
return(result);
}
/// <summary>
/// 释放对应关系
/// </summary>
public void Dispose()
{
DbConnectionMappingContext context = null;
if (DbConnectionMappingContextCache.Instance.TryGetValue(this.sourceConnectionName, out context))
{
DbConnectionMappingContextCache.Instance.Remove(this.sourceConnectionName);
}
}
/// <summary>
/// 得到映射后的连接名称
/// </summary>
/// <param name="srcConnectionName"></param>
/// <returns></returns>
public static string GetMappedConnectionName(string srcConnectionName)
{
DbConnectionMappingContext context = null;
string result = srcConnectionName;
if (DbConnectionMappingContextCache.Instance.TryGetValue(srcConnectionName, out context))
{
result = context.destinationConnectionName;
}
return(result);
}
/// <summary>
/// 创建连接名称的对应关系
/// </summary>
/// <param name="srcConnectionName"></param>
/// <param name="destConnectionName"></param>
/// <returns></returns>
public static DbConnectionMappingContext CreateMapping(string srcConnectionName, string destConnectionName)
{
ExceptionHelper.CheckStringIsNullOrEmpty(srcConnectionName, "srcConnectionName");
ExceptionHelper.CheckStringIsNullOrEmpty(destConnectionName, "destConnectionName");
ExceptionHelper.TrueThrow(DbConnectionMappingContextCache.Instance.ContainsKey(srcConnectionName),
"已经为连接名称{0}建立了映射关系", srcConnectionName);
DbConnectionMappingContext context = new DbConnectionMappingContext();
context.sourceConnectionName = srcConnectionName;
context.destinationConnectionName = destConnectionName;
DbConnectionMappingContextCache.Instance.Add(context.sourceConnectionName, context);
return(context);
}