/// <summary>
/// 从DataReader实例化一个Entity对
/// </summary>
/// <typeparam name="TA">实体类的类型TA</typeparam>
/// <typeparam name="TB">实体类的类型TB</typeparam>
/// <param name="reader">DataReader</param>
/// <param name="entityPropertysA">已经排好序的实体类的属性集合TA</param>
/// <param name="entityPropertysB">已经排好序的实体类的属性集合TB</param>
/// <returns></returns>
public static GenericPairEntity <TA, TB> FillOnePairEntity <TA, TB>(IDataReader reader)
where TA : class, new()
where TB : class, new()
{
List <PropertyInfo> entityPropertyInfoA = EntityMappingTool.GetEntityPropertyInfos(typeof(TA));
List <PropertyInfo> entityPropertyInfoB = EntityMappingTool.GetEntityPropertyInfos(typeof(TB));
GenericPairEntity <TA, TB> pair = new GenericPairEntity <TA, TB>();
pair.EntityA = new TA();
pair.EntityB = new TB();
int offset = 0;
for (int i = 0; i < entityPropertyInfoA.Count; i++)
{
if (reader.IsDBNull(offset + i))
{
continue;
}
entityPropertyInfoA[i].SetValue(pair.EntityA, reader.GetValue(offset + i), null);
}
offset = entityPropertyInfoA.Count;
for (int i = 0; i < entityPropertyInfoB.Count; i++)
{
if (reader.IsDBNull(offset + i))
{
continue;
}
entityPropertyInfoB[i].SetValue(pair.EntityB, reader.GetValue(offset + i), null);
}
return(pair);
}
/// <summary>
/// 创建用于删除的Sql命令
/// </summary>
public static DbCommand CreatDeleteCommand <T>(Database db, T entity)
{
Type entityType = typeof(T);
List <string> primaryKeyEntityFieldNames = EntityMappingTool.GetPrimaryKeyOfEntityField(entityType);
List <string> primaryKeyDbCloumnNames = EntityMappingTool.GetDbColumnNames(entityType,
primaryKeyEntityFieldNames);
List <DbType> primaryKeyDbColumnTypes = EntityMappingTool.GetDbColumnTypes(entityType,
primaryKeyEntityFieldNames);
List <PropertyInfo> primaryKeyPropertyInfos = EntityMappingTool.GetEntityPropertyInfos(entityType,
primaryKeyEntityFieldNames);
StringBuilder sqlBuilder = new StringBuilder();
sqlBuilder.AppendFormat("DELETE FROM [{0}] WHERE ", EntityMappingTool.GetDbTableName(entityType));
for (int i = 0; i < primaryKeyEntityFieldNames.Count; i++)
{
sqlBuilder.Append((i > 0) ? " AND " : "");
sqlBuilder.AppendFormat("([{0}]=@{0})", primaryKeyDbCloumnNames[i]);
}
//参数
DbCommand cmd = db.GetSqlStringCommand(sqlBuilder.ToString());
for (int i = 0; i < primaryKeyEntityFieldNames.Count; i++)
{
db.AddInParameter(cmd, "@" + primaryKeyDbCloumnNames[i], primaryKeyDbColumnTypes[i],
primaryKeyPropertyInfos[i].GetValue(entity, null));
}
return(cmd);
}
/// <summary>
/// 检索出Entity实例中有设置值的属性
/// </summary>
/// <typeparam name="T">实体类的类型</typeparam>
/// <param name="entity">实体类的实例</param>
/// <param name="entityPropertyInfos">实体类对应的属性</param>
/// <returns>Entity实例中有设置值的属性</returns>
public static List <PropertyInfo> GetNotNullEntityPropertys <T>(T entity)
{
List <PropertyInfo> entityPropertyInfos = EntityMappingTool.GetEntityPropertyInfos((typeof(T)));
List <PropertyInfo> notNullEntityPropertys = new List <PropertyInfo>(entityPropertyInfos.Count);
for (int i = 0; i < entityPropertyInfos.Count; i++)
{
if (entityPropertyInfos[i].GetValue(entity, null) != null)
{
notNullEntityPropertys.Add(entityPropertyInfos[i]);
}
}
return(notNullEntityPropertys);
}
/// <summary>
/// 从DataReader实例化一个Entity
/// </summary>
/// <typeparam name="T">实体类的类型</typeparam>
/// <param name="reader">DataReader</param>
/// <param name="entityPropertyInfos">已经排好序的实体类的属性集合</param>
/// <returns></returns>
public static T FillOneEntity <T>(IDataReader reader) where T : class, new()
{
List <PropertyInfo> entityPropertyInfo = EntityMappingTool.GetEntityPropertyInfos(typeof(T));
T entity = new T();
for (int i = 0; i < entityPropertyInfo.Count; i++)
{
if (reader.IsDBNull(i))
{
continue;
}
entityPropertyInfo[i].SetValue(entity, reader.GetValue(i), null);
}
return(entity);
}
