作者:浪漫十一狼
在下面的例子中实现了3个Join方法,其目的是把两个DataTable连接起来,相当于Sql的Inner Join方法,返回DataTable的所有列。
如果两个DataTable中的DataColumn有重复的话,把第二个设置为ColumnName+"_Second",下面是代码,希望对大家有所帮助。
using System;
using System.Data;
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namespace WindowsApplication1
{
public class SQLOps
{
public SQLOps()
{
}
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public static DataTable Join (DataTable First, DataTable Second, DataColumn[] FJC, DataColumn[] SJC)
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{
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//创建一个新的DataTable
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DataTable table = new DataTable("Join");
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// Use a DataSet to leverage DataRelation
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using(DataSet ds = new DataSet())
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{
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//把DataTable Copy到DataSet中
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ds.Tables.AddRange(new DataTable[]{First.Copy(),Second.Copy()});
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DataColumn[] parentcolumns = new DataColumn[FJC.Length];
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for(int i = 0; i < parentcolumns.Length; i++)
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{
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parentcolumns[i] = ds.Tables[0].Columns[FJC[i].ColumnName];
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}
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DataColumn[] childcolumns = new DataColumn[SJC.Length];
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for(int i = 0; i < childcolumns.Length; i++)
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{
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childcolumns[i] = ds.Tables[1].Columns[SJC[i].ColumnName];
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}
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//创建关联
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DataRelation r = new DataRelation(string.Empty,parentcolumns,childcolumns,false);
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ds.Relations.Add(r);
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//为关联表创建列
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for(int i = 0; i < First.Columns.Count; i++)
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{
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table.Columns.Add(First.Columns[i].ColumnName, First.Columns[i].DataType);
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}
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for(int i = 0; i < Second.Columns.Count; i++)
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{
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//看看有没有重复的列,如果有在第二个DataTable的Column的列明后加_Second
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if(!table.Columns.Contains(Second.Columns[i].ColumnName))
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table.Columns.Add(Second.Columns[i].ColumnName, Second.Columns[i].DataType);
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else
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table.Columns.Add(Second.Columns[i].ColumnName + "_Second", Second.Columns[i].DataType);
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}
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table.BeginLoadData();
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foreach(DataRow firstrow in ds.Tables[0].Rows)
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{
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//得到行的数据
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DataRow[] childrows = firstrow.GetChildRows(r);
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if(childrows != null && childrows.Length > 0)
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{
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object[] parentarray = firstrow.ItemArray;
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foreach(DataRow secondrow in childrows)
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{
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object[] secondarray = secondrow.ItemArray;
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object[] joinarray = new object[parentarray.Length+secondarray.Length];
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Array.Copy(parentarray,0,joinarray,0,parentarray.Length);
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Array.Copy(secondarray,0,joinarray,parentarray.Length,secondarray.Length);
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table.LoadDataRow(joinarray,true);
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}
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}
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}
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table.EndLoadData();
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}
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return table;
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}
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public static DataTable Join (DataTable First, DataTable Second, DataColumn FJC, DataColumn SJC)
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{
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return Join(First, Second, new DataColumn[]{FJC}, new DataColumn[]{SJC});
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}
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public static DataTable Join (DataTable First, DataTable Second, string FJC, string SJC)
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{
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return Join(First, Second, new DataColumn[]{First.Columns[FJC]}, new DataColumn[]{First.Columns[SJC]});
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}
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}
}
在下面的例子中实现了3个Join方法,其目的是把两个DataTable连接起来,相当于Sql的Inner Join方法,返回DataTable的所有列。
如果两个DataTable中的DataColumn有重复的话,把第二个设置为ColumnName+"_Second",下面是代码,希望对大家有所帮助。
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