/// <summary>
/// 查询集合，带分页
/// </summary>
/// <param name="item">框架实体</param>
/// <param name="dp">分页对象</param>
/// <returns>对象集合</returns>
public List <T> SelectList(FrameWorkItem item, DataPage dp = null)
{
IDataReader dr = null;
try
{
dr = BuildDataReader(item, dp);
List <T> list = new List <T>();
if (dp != null && dp.PageSize > 0)
{
int result = GetResult <int>(string.Format("SELECT COUNT(1) FROM ({0}) a", item.Sql), item.ConnectionString, item.SqlParam);
dp.RowCount = result;
}
while (dr != null && dr.Read())
{
T tempT = new T();
tempT = DynamicBuilderEntity <T> .CreateBuilder(dr).Build(dr);
list.Add(tempT);
}
return(list);
}
catch (Exception ex)
{
throw ex;
}
finally
{
if (dr != null)
{
dr.Close();
}
}
}
/// <summary>
/// 查询单个实体
/// </summary>
/// <param name="item">框架实体</param>
/// <returns>单个对象</returns>
public T SelectModel(FrameWorkItem item)
{
IDataReader dr = null;
try
{
dr = BuildDataReader(item);
if (dr != null && dr.Read())
{
return(DynamicBuilderEntity <T> .CreateBuilder(dr).Build(dr));
}
}
catch (Exception ex)
{
throw ex;
}
finally
{
if (dr != null)
{
dr.Close();
}
}
return(default(T));
}
/// <summary>
/// 建立过程
/// </summary>
/// <param name="dataRecord">取数据流字段</param>
/// <returns></returns>
public static DynamicBuilderEntity <T> CreateBuilder(IDataRecord dataRecord)
{
var dynamicBuilder = new DynamicBuilderEntity <T>();
var method = new DynamicMethod("DynamicCreateEntity", typeof(T), new[] { typeof(IDataRecord) }, typeof(T), true);
ILGenerator generator = method.GetILGenerator();
LocalBuilder result = generator.DeclareLocal(typeof(T));
generator.Emit(OpCodes.Newobj, typeof(T).GetConstructor(Type.EmptyTypes));
generator.Emit(OpCodes.Stloc, result);
for (int i = 0; i < dataRecord.FieldCount; i++)
{
var propertyInfo = typeof(T).GetProperty(dataRecord.GetName(i));
if (propertyInfo == null)
{
continue;
}
var endIfLabel = generator.DefineLabel();
if (propertyInfo.GetSetMethod() == null)
{
continue;
}
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldc_I4, i);
generator.Emit(OpCodes.Callvirt, isDBNullMethod);
generator.Emit(OpCodes.Brtrue, endIfLabel);
generator.Emit(OpCodes.Ldloc, result);
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldc_I4, i);
generator.Emit(OpCodes.Callvirt, getValueMethod);
generator.Emit(OpCodes.Unbox_Any, dataRecord.GetFieldType(i));
generator.Emit(OpCodes.Callvirt, propertyInfo.GetSetMethod());
generator.MarkLabel(endIfLabel);
}
generator.Emit(OpCodes.Ldloc, result);
generator.Emit(OpCodes.Ret);
dynamicBuilder.handler = (Load)method.CreateDelegate(typeof(Load));
return(dynamicBuilder);
}
