/// <summary>
/// 通过数据库上下文名称获取数据库上下文,进而得到数据库访问方法集合IDataPersist
/// </summary>
public static IDataPersist GetDataPersist(string pDbContextName)
{
CommPersist commPersist = null;
try
{
//键值对中已经存在的,直接获取
commPersist = PersistManeger.PersistDict[pDbContextName];
}
catch
{
}
if (commPersist == null)
{
DbProviderInfo theProveder = LocalConfig.GetProviderInfo(pDbContextName);
BaseDbContext pDbContext;
if (!string.IsNullOrWhiteSpace(theProveder.ContextAssembly))
{
//theProveder.ContextAssembly为Orm.MapContext,也是在OrmConfig文件中有配置的
List <Type> source = (
from tt in Assembly.LoadFrom(Path.Combine(AppSettings.BinPath, theProveder.ContextAssembly)).GetTypes()
where tt.BaseType == typeof(BaseDbContext)
select tt).ToList <Type>();
if (string.IsNullOrWhiteSpace(theProveder.ContextType))
{
source = (
from tt in source
where tt.FullName == theProveder.ContextType
select tt).ToList <Type>();
}
/*
* 下面的代码通过反射执行RegisterMapContext类(此类继承了BaseDbContext)里面的构造函数
* 即执行了BaseDbContext里面的RegisterMapping方法，从而得到数据库上下文的实例
*/
Type type = source.FirstOrDefault <Type>();
ConstructorInfo constructor = type.GetConstructor(new Type[]
{
typeof(string),
typeof(string)
});
pDbContext = (BaseDbContext)constructor.Invoke(new object[]
{
theProveder.ProviderName,
theProveder.ConnectionString
});
}
else
{
pDbContext = new NonMapDbContext(theProveder.ProviderName, theProveder.ConnectionString);
}
commPersist = new CommPersist(pDbContext, pDbContextName);
lock (PersistManeger.locker)
{
PersistManeger.PersistDict[pDbContextName] = commPersist;
CommPersist.connectionDic[pDbContextName] = theProveder.ConnectionString;
}
}
return(commPersist);
}
public static IDataPersist GetDataPersist(DbProviderInfo pProviderInfo)
{
CommPersist commPersist = null;
try
{
commPersist = PersistManeger.PersistDict[pProviderInfo.DbContextName];
}
catch
{
}
if (commPersist == null)
{
BaseDbContext pDbContext;
if (!string.IsNullOrWhiteSpace(pProviderInfo.ContextAssembly))
{
List <Type> source = (
from tt in Assembly.LoadFrom(Path.Combine(AppSettings.BinPath, pProviderInfo.ContextAssembly)).GetTypes()
where tt.BaseType == typeof(BaseDbContext)
select tt).ToList <Type>();
if (string.IsNullOrWhiteSpace(pProviderInfo.ContextType))
{
source = (
from tt in source
where tt.FullName == pProviderInfo.ContextType
select tt).ToList <Type>();
}
Type type = source.FirstOrDefault <Type>();
ConstructorInfo constructor = type.GetConstructor(new Type[]
{
typeof(string),
typeof(string)
});
pDbContext = (BaseDbContext)constructor.Invoke(new object[]
{
pProviderInfo.ProviderName,
pProviderInfo.ConnectionString
});
}
else
{
pDbContext = new NonMapDbContext(pProviderInfo.ProviderName, pProviderInfo.ConnectionString);
}
commPersist = new CommPersist(pDbContext, pProviderInfo.DbContextName);
lock (PersistManeger.locker)
{
PersistManeger.PersistDict[pProviderInfo.DbContextName] = commPersist;
CommPersist.connectionDic[pProviderInfo.DbContextName] = pProviderInfo.ConnectionString;
}
}
return(commPersist);
}