protected MTable getTableByRC(int[] rows, string[] selectCols)
{
MTable ret = new MTable();
for (int i = 0; i < selectCols.Length; i++)
{
if (!this.Table.Columns.Contains(selectCols[i]))
{
throw (new Exception("不存在该列！"));
}
ret.Table.Columns.Add(selectCols[i], this.Table.Columns[selectCols[i]].DataType);
}
if (this.tTable == null)
{
return(null);
}
for (int i = 0; i < rows.Length; i++)
{
if (i >= this.Table.Rows.Count)
{
throw new Exception("选出的行号越界！");
}
DataRow dr = ret.tTable.NewRow();
for (int j = 0; j < selectCols.Length; j++)
{
dr[selectCols[j]] = this.Table.Rows[i][selectCols[j]];
}
ret.Table.Rows.Add(dr);
}
return(ret);
}
public BaseDataTable(MTable tb)
{
if (tb == null || tb.GetTable() == null)
{
throw (new Exception("数据异常！"));
}
this.Table = tb.GetTable().Copy();
}
public void Contact(MTable tb)
{
for (int i = 0; i < tb.Count; i++)
{
DataRow dr = this.Table.NewRow();
dr.ItemArray = tb.Table.Rows[i].ItemArray;
}
}
public List <T> ToList <T>(string rows, string colname)
{
if (rows == null || rows.Trim().Length == 0 || rows.Trim() == "*" || rows.Trim() == ":")
{
return(ToList <T>(colname));
}
MTable ret = this[rows, colname];
return(ret.ToList <T>(colname));
}
protected MTable getCrossTable(List <int> SelectRows, string SelectCols)
{
MTable ret = null;
string[] ColArr = SelectCols.Trim().Split(',');
if (SelectCols.Trim() == "*")
{
ColArr = this.TColumns.Keys.ToArray <string>();
}
ret = getTableByRC(SelectRows.ToArray <int>(), ColArr);
return(ret);
}
public void Union(MTable tb)
{
if (tb.Count > 0 && this.Count > 0 && tb.Count != this.Count)
{
throw (new Exception("联合的表行数需要一致！"));
}
for (int i = 0; i < tb.GetTable().Columns.Count; i++)
{
DataColumn dc = tb.GetTable().Columns[i];
if (!this.Table.Columns.Contains(dc.ColumnName))
{
Type t = dc.DataType;
this.AddColumnByArray(dc.ColumnName, tb, dc.ColumnName);
}
}
}
public MTable Select(string sql)
{
if (this.Table == null)
{
return(null);
}
MTable ret = new MTable();
ret.Table = this.Table.Clone();
if (sql == null || sql.Trim().Length == 0)
{
return(ret);
}
DataRow[] drs = this.Table.Select(sql);
for (long i = 0; i < drs.Length; i++)
{
DataRow dr = ret.Table.NewRow();
dr.ItemArray = drs[i].ItemArray;
ret.Table.Rows.Add(drs[i].ItemArray);
}
return(ret);
}
public void AddColumnByArray(string ColumnName, MTable tb, string col)
{
Type t = tb.GetTable().Columns[col].DataType;
if (Table == null)
{
Table = new DataTable();
}
if (this.Count > 0 && tb.Count > 0 && this.Count != tb.Count)
{
throw (new Exception("插入新列元素数量与现有元素数量不匹配！"));
}
if (!this.Table.Columns.Contains(ColumnName))
{
this.Table.Columns.Add(ColumnName, t);
}
DataTable dt = tb.GetTable();
for (int i = 0; i < dt.Rows.Count; i++)
{
DataRow dr = null;
if (i < this.Table.Rows.Count)
{
dr = this.Table.Rows[i];
}
if (dr == null)
{
dr = this.Table.NewRow();
this.Table.Rows.Add(dr);
}
if (dt.Rows[i].IsNull(col))
{
continue;
}
dr[ColumnName] = Convert.ChangeType(dt.Rows[i][col], t);
}
}
