/// <summary>
/// 创建IDBDatabase
/// </summary>
/// <param name="strConnection">Connection的全称</param>
/// <returns>创建的IDBDatabase</returns>
public static IDBDatabase CreateDatabase(String strConnection)
{
List <DBProvider> list = Database.DBProvider.ProviderList;
DBProvider dbProvider = list.Find(delegate(DBProvider x) { return(x.Connection.FullName == strConnection); });
if (dbProvider == null)
{
return(null);
}
IDBDatabase db = CreateDatabase(dbProvider);
return(db);
}
/// <summary>
/// 创建IDBDatabase
/// </summary>
/// <param name="providerFactory">表示一组方法，这些方法用于创建提供程序对数据源类的实现的实例</param>
/// <returns>创建的IDBDatabase</returns>
public static IDBDatabase CreateDatabase(DbProviderFactory providerFactory)
{
DBProvider dbProvider = new DBProvider();
using (DbConnection cnn = providerFactory.CreateConnection())
using (DbCommand cmd = providerFactory.CreateCommand())
using (DbCommandBuilder cmdBuilder = providerFactory.CreateCommandBuilder())
using (DbDataAdapter adapter = providerFactory.CreateDataAdapter())
{
DbParameter param = providerFactory.CreateParameter();
dbProvider.Connection = cnn.GetType();
dbProvider.Command = cmd.GetType();
dbProvider.Parameter = param.GetType();
dbProvider.CommandBuilder = cmdBuilder.GetType();
dbProvider.DataAdapter = adapter.GetType();
}
IDBDatabase db = CreateDatabase(dbProvider);
return(db);
}
/// <summary>
/// 创建IDBDatabase
/// </summary>
/// <param name="dbProvider">数据库驱动提供者</param>
/// <returns>创建的IDBDatabase</returns>
public static IDBDatabase CreateDatabase(DBProvider dbProvider)
{
Type type = DbDatabase.MakeGenericType(dbProvider.Connection, dbProvider.Command,
dbProvider.Parameter, dbProvider.DataAdapter, dbProvider.CommandBuilder);
IDBDatabase db = Activator.CreateInstance(type) as IDBDatabase;
String strCnnName = dbProvider.Connection.FullName.ToUpper();
if (strCnnName.Contains(".OLEDB.") ||
strCnnName.Contains(".ODBC."))
{
db.ParameterDerive = DBUnnamedParameterDerive.Instance;
}
else if (strCnnName.Contains("ORACLE"))
{
db.ParameterDerive = DBOracleParameterDerive.Instance;
}
else
{
db.ParameterDerive = DBNamedParameterDerive.Instance;
}
return(db);
}
private static void GetProvider(Assembly assembly, List <DBProvider> lProvider)
{
List <Type> lConnection = new List <Type>();
List <Type> lCommand = new List <Type>();
List <Type> lParameter = new List <Type>();
List <Type> lDataAdapter = new List <Type>();
List <Type> lCommandBuilder = new List <Type>();
Type[] types = assembly.GetTypes();
foreach (Type t in types)
{
if (!t.IsClass)
{
continue;
}
if (!t.IsPublic)
{
continue;
}
if (t.BaseType == typeof(DbConnection))
{
lConnection.Add(t);
}
else if (t.BaseType == typeof(DbCommand))
{
lCommand.Add(t);
}
else if (t.BaseType == typeof(DbParameter))
{
lParameter.Add(t);
}
else if (t.BaseType == typeof(DbDataAdapter))
{
lDataAdapter.Add(t);
}
else if (t.BaseType == typeof(DbCommandBuilder))
{
lCommandBuilder.Add(t);
}
}
foreach (Type cnn in lConnection)
{
String ns = cnn.Namespace;
DBProvider provider = new DBProvider();
provider.Connection = cnn;
Predicate <Type> func = delegate(Type x) { return(x.Namespace == ns); };
provider.Command = lCommand.Find(func);
provider.Parameter = lParameter.Find(func);
provider.DataAdapter = lDataAdapter.Find(func);
provider.CommandBuilder = lCommandBuilder.Find(func);
if (provider.Command != null &&
provider.Parameter != null &&
provider.DataAdapter != null &&
provider.CommandBuilder != null)
{
lProvider.Add(provider);
}
}
}
