我有两个DataGrid Concour和Epruve我想要Epreuve显示选择Concour的行时...我的问题是如何访问DataGrid Epreuve以从MySQL填充。
这是我试过的
XAML
<DataGrid x:Name="Concours" IsReadOnly="True" AutoGenerateColumns="True" CanUserReorderColumns="True" CanUserResizeColumns="True" CanUserResizeRows="False" CanUserSortColumns="True" SelectionChanged="Concour_SelectionChanged" HorizontalAlignment="Left" Margin="288,48,0,0" VerticalAlignment="Top" Height="345" Width="652">
<DataGrid.RowDetailsTemplate>
<DataTemplate>
<DataGrid x:Name="Epreuve" IsReadOnly="False" CanUserAddRows="True" CanUserDeleteRows="True" CanUserReorderColumns="True" CanUserResizeColumns="True" CanUserSortColumns="True" CanUserResizeRows="False" RowDetailsVisibilityMode="VisibleWhenSelected">
<DataGrid.Columns>
<DataGridTextColumn Header="Code" Binding="{Binding Code}"/>
<DataGridTextColumn Header="Désignation" Binding="{Binding Designation}"/>
<DataGridTextColumn Header="Coefficient" Binding="{Binding Coef}"/>
<DataGridTextColumn Header="Date" Binding="{Binding Date}"/>
</DataGrid.Columns>
</DataGrid>
</DataTemplate>
</DataGrid.RowDetailsTemplate>
CS
private void Concour_SelectionChanged (object sender, EventArgs e)
{
//Get the First Cell Value
DataTable dt = new DataTable();
dt = ((DataView)Concours.ItemsSource).ToTable();
List<String> L = new List<string>();
foreach (DataRow row in dt.Rows)
{
L.Add((String)row[0]);
}
int row_number = Concours.SelectedIndex;
//Connect To DataBase (gestion_concour)
MySqlConnectionStringBuilder builder = new MySqlConnectionStringBuilder();
builder.Server = "127.0.0.1";
builder.UserID = "root";
builder.Password = "root";
builder.Database = "gestion_concour";
MySqlConnection connection = new MySqlConnection(builder.ToString());
connection.Open();
//Fill Epreuve
String q = "SELECT * FROM gestion_Concour.concour WHERE Code = @Code";
MySqlCommand cmd = new MySqlCommand(q, connection);
cmd.CommandText = q;
cmd.Parameters.AddWithValue("@Code", L[row_number]);
cmd.ExecuteNonQuery();
MySqlDataAdapter DA = new MySqlDataAdapter(cmd);
DataTable DT = new DataTable("Epreuve");
DA.Fill(DT);
Epreuve.ItemSource = DT.DefaultView;
DA.Update(DT);
connection.Close();
}
我得到了这个错误
名称＆＃39; Epreuve＆＃39;在当前上下文中不存在
答案 0 :(得分：1)
我更改了public class ReadFromFile {
public static void main(String[] args) throws Exception {
StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
env.getConfig().disableSysoutLogging();
env.getConfig().setRestartStrategy(RestartStrategies.fixedDelayRestart(4, 10000));
env.enableCheckpointing(5000); // create a checkpoint every 5 secodns
env.setParallelism(6);
File dir = new File(System.getProperty("user.dir") + "/cep");
///data/tools/devlop/idea/flink-test/cep
System.out.println(dir.getPath());
if (!dir.exists()) {
dir.mkdir();
}
//read data from local file
//it looks like below
//016-04-20T00:04:35.155Z","10.170.236.226","<p2-sidekiq> 2016-04-20T00:04:31.415Z 4982 TID-oxvsomclk AlterationWorker JID-34683abcb587e008153ce458 INFO: start"
final DataStream<String> messageStream =env.readTextFile("file://"+dir);
// filter data
DataStream<String> da = messageStream.filter(new FilterFunction<String>() {
@Override
public boolean filter(String value) throws Exception {
if (value !=null && value.contains(" JID-") && value.contains("INFO: ")) {
return true;
}
return false;
}
});
// format data
DataStream<Tuple4<String, String, String,String>> t3 = da.map(new MapFunction<String, Tuple4<String, String,String, String>>() {
@Override
public Tuple4<String,String, String, String> map(String value) throws Exception {
String[] info = value.split("INFO: ");
if (info.length == 2) {
String[] jid = info[0].split(" JID-");
if (jid.length == 2){
return new Tuple4<String, String, String,String>(jid[0],jid[1].trim(), info[1],"");
}
}
return null;
}
});
//make tuple to event
DataStream<Event_d> input = t3.map(new MapFunction<Tuple4<String, String,String, String>, Event_d>() {
@Override
public Event_d map(Tuple4<String, String,String, String> value) throws Exception {
return new Event_d(value.f0, value.f1, value.f2,value.f3);
}
}).keyBy(new KeySelector<Event_d, String>() {
@Override
public String getKey(Event_d value) throws Exception {
return value.getName();
}
});
// design pattern contains (start --> SendThirdPartWorker --> done)
Pattern<Event_d, ?> pattern= Pattern.<Event_d>begin("start").where(
new FilterFunction<Event_d>() {
@Override
public boolean filter(Event_d value) throws Exception {
return value.getPrice().contains("start");//&& MD5Util.MD5(value.getMd5())==;
}
}).next("send").where(new FilterFunction<Event_d>() {
@Override
public boolean filter(Event_d value) throws Exception {
return value.getPrice().contains("SendThirdPartWorker");//&& jidMap.get(value.getName())==value.getName();
}
}).followedBy("done").where(new FilterFunction<Event_d>() {
@Override
public boolean filter(Event_d value) throws Exception {
return value.getPrice().contains("done") ;//&& a;
}
}).within(milliseconds(1000));
final long mi1 = new Date().getTime();
DataStream<String> result = CEP.pattern(input, pattern).select(
new PatternSelectFunction<Event_d, String>() {
@Override
public String select(Map<String, Event_d> pattern) {
StringBuilder builder = new StringBuilder();
builder.append(dataComt(new Date().getTime(),mi1)+" "+pattern.get("start").getName())
.append(" -- ").append(pattern.get("send").getPrice());
//.append("--").append(pattern.get("done").getPrice());
return builder.toString();
}
});
result.writeAsText(dir + "result", FileSystem.WriteMode.OVERWRITE);
env.execute("Read from Kafka custom");
}
public static String dataComt(long current,long last) {
long c = (current-last)/1000;
return "\"read "+c+"s \"";
}
}
并使用Concour_SelectionChnged
<强> CS
Concour_LoadRowDetails