/// <summary>
/// 删除
/// </summary>
/// <param name="modelDT">表</param>
/// <param name="where">条件</param>
public static void Delete(DataTableEntity modelDT, DataWhereEntity[] where = null)
{
IEnumerable<int> listDC = ReadRowIndexList(modelDT, where);
//删除行
foreach (int RowIndex in listDC)
{
DataContentManage.Delete(DataContentManage.GetContent(modelDT.Columns[0], RowIndex));
}
}
/// <summary>
/// 读取
/// </summary>
/// <param name="modelDT">表</param>
/// <param name="modelDR">显示的列</param>
/// <param name="where">是否满足条件的函数</param>
/// <returns></returns>
public static List<DataRowEntity> Read(DataTableEntity modelDT, string[] column, DataWhereEntity[] where = null, DataOrderEntity order = null, DataLimitEntity limit = null)
{
List<DataRowEntity> listDR = new List<DataRowEntity>();
int[] arrDC = ReadRowIndexList(modelDT, where).ToArray();
object[,] arrContent;
//排序
if (order != null)
{
listDR.Clear();
//以列为维度遍历取值
arrContent = new object[arrDC.Count(), order.Columns.Length];
for (int i = 0; i < order.Columns.Length; i++)
{
//列需要修改
DataColumnEntity modelDC = DataColumnManage.Read(modelDT, new DataColumnEntity { Name = order.Columns[i] });
for (int j = 0; j < arrDC.Length; j++)
{
arrContent[j, i] = DataContentManage.GetContent(modelDC, arrDC[j]).Content;
}
}
//以行为维度赋值
for (int j = 0; j < arrDC.Length; j++)
{
object[] Contents = new object[order.Columns.Length];
for (int i = 0; i < order.Columns.Length; i++)
{
Contents[i] = arrContent[j, i];
}
listDR.Add(new DataRowEntity { Columns = order.Columns, Contents = Contents, RowIndex = arrDC[j] });
}
listDR.Sort(order.Comparison);
arrDC = listDR.Select(info => info.RowIndex).ToArray();
listDR.Clear();
}
//截取
if (limit != null)
{
IEnumerable<int> enumDC = arrDC;
//起始截取
if (limit.Start < enumDC.Count())
enumDC = enumDC.Skip(limit.Start);
//结束截取
if (limit.Length > 0 && limit.Length < enumDC.Count())
enumDC = enumDC.Take(limit.Length);
arrDC = enumDC.ToArray();
}
//以列为维度遍历取值
arrContent = new object[arrDC.Count(), column.Length];
for (int i = 0; i < column.Length; i++)
{
//列需要修改
DataColumnEntity modelDC = DataColumnManage.Read(modelDT, new DataColumnEntity { Name = column[i] });
for (int j = 0; j < arrDC.Length; j++)
{
arrContent[j, i] = DataContentManage.GetContent(modelDC, arrDC[j]).Content;
}
}
//以行为维度赋值
for (int j = 0; j < arrDC.Length; j++)
{
object[] Contents = new object[column.Length];
for (int i = 0; i < column.Length; i++)
{
Contents[i] = arrContent[j, i];
}
listDR.Add(new DataRowEntity { Columns = column, Contents = Contents, RowIndex = arrDC[j] });
}
return listDR;
}
/// <summary>
/// 修改
/// </summary>
public static void Update(DataTableEntity modelDT, DataRowEntity modelDR, DataWhereEntity[] where = null)
{
int[] arrDC = ReadRowIndexList(modelDT, where).ToArray();
string[] Columns = modelDT.UserColumns.Select(info => info.Name).ToArray();
//以列为维度遍历取值
object[,] arrContent = new object[arrDC.Count(), Columns.Length];
for (int i = 0; i < modelDR.Columns.Length; i++)
{
//列需要修改
DataColumnEntity modelDC = DataColumnManage.Read(modelDT, new DataColumnEntity { Name = modelDR.Columns[i] });
for (int j = 0; j < arrDC.Length; j++)
{
DataContentEntity modelDContent = DataContentManage.GetContent(modelDC, arrDC[j]);
modelDContent.Content = modelDR.Contents[i];
DataContentManage.Update(modelDContent);
}
}
}
/// <summary>
/// 根据条件晒选行编号
/// </summary>
/// <param name="modelDT">表</param>
/// <param name="where">是否满足条件的函数</param>
/// <returns></returns>
public static IEnumerable<int> ReadRowIndexList(DataTableEntity modelDT, DataWhereEntity[] where)
{
//晒选行编号
IEnumerable<int> listDC = new List<int>();
//无条件返回所有
if (where == null) listDC = DataTableManage.GetRowIndexList(modelDT);
else
{
foreach (DataWhereEntity modelW in where)
{
DataColumnEntity modelDC = modelDT.Columns.Where(info => info.Name == modelW.ColumnName).First();
if (listDC.Count() == 0)//第一个条件
{
if (modelW.ColumnName == EColumnType.RowIndex.ToString())
{
listDC = DataContentManage.Read(modelDC, info => modelW.Predicate(info.RowIndex)).Select(info => info.RowIndex);
}
else
{
listDC = DataContentManage.Read(modelDC, info => modelW.Predicate(info.Content)).Select(info => info.RowIndex);
}
}
else//后几个条件在前一个条件基础上晒选
{
if (modelW.ColumnName == EColumnType.RowIndex.ToString())
{
listDC = DataContentManage.Read(modelDC, info => listDC.Contains(info.RowIndex) && modelW.Predicate(info.RowIndex)).Select(info => info.RowIndex);
}
else
{
listDC = DataContentManage.Read(modelDC, info => listDC.Contains(info.RowIndex) && modelW.Predicate(info.Content)).Select(info => info.RowIndex);
}
}
}
}
return listDC;
}
