Java Swing从数据库获取数据错误
我不能让它工作。。。如何从抽象模型内的数据库中获取数据?我真的需要帮助,谢谢。。我尝试了不同的解决方案,但没有成功。。。有人能帮我吗谢谢。。。即使只是上帝保佑Java Swing从数据库获取数据错误,java,sql,swing,postgresql,Java,Sql,Swing,Postgresql,我不能让它工作。。。如何从抽象模型内的数据库中获取数据?我真的需要帮助,谢谢。。我尝试了不同的解决方案,但没有成功。。。有人能帮我吗谢谢。。。即使只是上帝保佑 import java.awt.Dimension; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.ResultSetMetaData; import java.sql.SQLExc
import java.awt.Dimension;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.ListSelectionModel;
import javax.swing.RowFilter;
import javax.swing.SpringLayout;
import javax.swing.SwingConstants;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableRowSorter;
public class ConsolidateInvoices extends JPanel {
private JTable table;
private JTextField Name;
private JTextField BusinessPartner;
private TableRowSorter<Model> sorter;
private String[] columnNames;
private Object[][] data;
public ConsolidateInvoices() {
JPanel form = new JPanel(new SpringLayout());
JLabel lblName = new JLabel("Name:", SwingConstants.TRAILING);
form.add(lblName);
Name = new JTextField();
form.add(Name);
JLabel lblBusinessPartner = new JLabel("Business Partner:",
SwingConstants.TRAILING);
form.add(lblBusinessPartner);
BusinessPartner = new JTextField();
// Whenever filterText changes do the filter method
BusinessPartner.getDocument().addDocumentListener(
new DocumentListener() {
public void changedUpdate(DocumentEvent e) {
newFilter();
}
public void insertUpdate(DocumentEvent e) {
newFilter();
}
public void removeUpdate(DocumentEvent e) {
newFilter();
}
});
lblBusinessPartner.setLabelFor(BusinessPartner);
form.add(BusinessPartner);
SpringUtilities.makeCompactGrid(form, 2, 2, 6, 6, 6, 6);
add(form);
try {
Class.forName("org.postgresql.Driver");
Connection connection = null;
connection = DriverManager.getConnection(
"jdbc:postgresql://127.0.0.1:5432/adempiere2",
"postgres", "postgres");
// Read data from a table
String query = "Select c_invoice_id, documentno "
+ "from adempiere.c_invoice";
Statement stmt = connection.createStatement();
ResultSet rst = stmt.executeQuery(query);
ResultSetMetaData md = rst.getMetaData();
int columns = md.getColumnCount();
int rows = 1;
//new Boolean(false)
columnNames = new String[columns];
// Get column names
for (int i = 1; i <= columns; i++) {
columnNames[i-1] = md.getColumnName(i);
}
System.out.println(rows);
data = new Object[rows][columns];
// Get row data
while (rst.next()) {
int ctr = 0;
for (int i = 1; i <= columns; i++) {
data[ctr][i-1] = rst.getObject(i);
}
ctr++;
}
rst.close();
stmt.close();
connection.close();
} catch (SQLException e) {
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
// Create a separate panel for the table
setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
table = new JTable(new Model());
// Sorter
Model model = new Model();
sorter = new TableRowSorter<Model>(model);
table.setRowSorter(sorter);
table.setPreferredScrollableViewportSize(new Dimension(700, 700));
table.setFillsViewportHeight(true);
// To make the selection single
table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
// To create the scroll panel
JScrollPane scrollPane = new JScrollPane(table);
// initColumnSizes(table);
// setUpSportColumn(table, table.getColumnModel().getColumn(2));
add(scrollPane);
}
// The filter method used for the business partner
private void newFilter() {
RowFilter<Model, Object> rf = null;
// If current text doesn't parse, don't update.
try {
rf = RowFilter.regexFilter(BusinessPartner.getText(), 0);
} catch (java.util.regex.PatternSyntaxException e) {
return;
}
sorter.setRowFilter(rf);
}
class Model extends AbstractTableModel {
public int getColumnCount() {
return columnNames.length;
}
public int getRowCount() {
return data.length;
}
public String getColumnName(int col) {
return columnNames[col];
}
public Object getValueAt(int row, int col) {
return data[row][col];
}
// To make the column a check box
public Class getColumnClass(int c) {
return getValueAt(0, c).getClass();
}
public boolean isCellEditable(int row, int col) {
return false;
}
public void setValueAt(Object value, int row, int col) {
data[row][col] = value;
fireTableCellUpdated(row, col);
}
}
private static void showWindow() {
// Create and set up the window.
JFrame frame = new JFrame("Table");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Create and set up the content pane.
ConsolidateInvoices newContentPane = new ConsolidateInvoices();
newContentPane.setOpaque(true); // content panes must be opaque
frame.setContentPane(newContentPane);
// Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
showWindow();
}
});
}
}
导入java.awt.Dimension;
导入java.sql.Connection;
导入java.sql.DriverManager;
导入java.sql.ResultSet;
导入java.sql.ResultSetMetaData;
导入java.sql.SQLException;
导入java.sql.Statement;
导入javax.swing.BoxLayout;
导入javax.swing.JFrame;
导入javax.swing.JLabel;
导入javax.swing.JPanel;
导入javax.swing.JScrollPane;
导入javax.swing.JTable;
导入javax.swing.JTextField;
导入javax.swing.ListSelectionModel;
导入javax.swing.RowFilter;
导入javax.swing.SpringLayout;
导入javax.swing.SwingConstants;
导入javax.swing.event.DocumentEvent;
导入javax.swing.event.DocumentListener;
导入javax.swing.table.AbstractTableModel;
导入javax.swing.table.TableRowSorter;
公共类合并文件扩展JPanel{
专用JTable表;
私有JTextField名称;
私人JTextField业务伙伴;
私人桌面分拣机;
私有字符串[]列名称;
私有对象[][]数据;
公共合并通知(){
JPanel form=newjpanel(newspringlayout());
JLabel lblName=新的JLabel(“名称:”,SwingConstants.TRAILING);
添加表格(lblName);
Name=新的JTextField();
表格.加入(姓名);
JLabel lblBusinessPartner=新的JLabel(“业务合作伙伴:”,
SwingConstants.training);
表格.添加(LBL业务合作伙伴);
业务伙伴=新的JTextField();
//每当filterText发生更改时,请执行filter方法
BusinessPartner.getDocument().addDocumentListener(
新建DocumentListener(){
公共作废更改日期(记录事件e){
newFilter();
}
公共作废插入更新(文档事件e){
newFilter();
}
公共作废移除更新(文档事件e){
newFilter();
}
});
lblBusinessPartner.setLabelFor(业务伙伴);
添加表格(业务伙伴);
makeCompactGrid(表单,2,2,6,6,6,6);
添加(表格);
试一试{
Class.forName(“org.postgresql.Driver”);
连接=空;
connection=DriverManager.getConnection(
“jdbc:postgresql://127.0.0.1:5432/adempiere2",
“博士后”、“博士后”);
//从表中读取数据
String query=“选择c\U发票\U id,单据号”
+“来自adempiere.c_发票”;
语句stmt=connection.createStatement();
ResultSet rst=stmt.executeQuery(查询);
ResultSetMetaData md=rst.getMetaData();
int columns=md.getColumnCount();
int行=1;
//新布尔值(false)
columnNames=新字符串[列];
//获取列名
对于(int i=1;i我想问题在这里:
table = new JTable(new Model());
// Sorter
Model model = new Model();
sorter = new TableRowSorter<Model>(model);
table.setRowSorter(sorter);
并将fireTableCellUpdated(行,列);
(在setValueAt()中)替换为:
如果你看一下,我们可以看到一条有趣的评论:
// Normally, one should call fireTableCellUpdated() when
// a value is changed. However, doing so in this demo
// causes a problem with TableSorter. The tableChanged()
// call on TableSorter that results from calling
// fireTableCellUpdated() causes the indices to be regenerated
// when they shouldn't be. Ideally, TableSorter should be
// given a more intelligent tableChanged() implementation,
// and then the following line can be uncommented.
// fireTableCellUpdated(row, col);
虽然您没有说明问题是什么,但我已经看到了几个问题:
table = new JTable(new Model());
// Sorter
Model model = new Model();
您创建了两个模型,而您应该使用同一个实例。现在您可能可以避开这个问题,因为它们共享相同的数据
} catch (SQLException e) {
// Always log or print an exception
} catch (ClassNotFoundException e) {
e.printStackTrace();
// If this exception occurs, the rest of the code is pretty much useless since you won't have a connection to the DB. You should rather forward this exception as an error
}
// To make the column a check box
public Class getColumnClass(int c) {
return getValueAt(0, c).getClass();
}
如果没有值,则会出现异常(ArrayIndexOutOfBounds或NullPointerException)。此信息应基于ResultMetadataSet
public boolean isCellEditable(int row, int col) {
return false;
}
public void setValueAt(Object value, int row, int col) {
data[row][col] = value;
fireTableCellUpdated(row, col);
}
如果您说您的单元格不可编辑,则无需实现setValueAt,它将永远不会被调用
你的for循环怎么了
for (int i = 1; i <= columns; i++) {
columnNames[i-1] ...
用于(int i=1;i到底什么失败了?显示stacktrace。只显示有问题的部分,而不是整个程序。-将问题简化为一小段代码,说明您看到的错误。通常,您会通过这样做的本质自己发现问题。从数据库中获取数据的部分e> ,不应与用户界面
部分混合。始终将此部分放在单独的线程中,或使用。您使用此设置阻止了EDT:(此外,在我看来,您正在使用此行数据[row][col覆盖数据(对象数组)
的先前值)=value;
在你的模型类中,这不是必须是类似于data=this.data;
在模型类的构造函数中谢谢你的建议我知道代码真的很凌乱…因为我压力太大,无法再次修复它哈哈..谢谢..但是我能问一些问题吗?通过抽象集扩展的模型如何获得数据从数据库?我应该使用数组还是向量?谢谢,我有点困惑,因为这是我第一次使用jframe。。。thanks@KevinTan你在当前代码中遇到了什么问题?我看不出什么不起作用。你可以使用二维数组来存储值,这不是问题。嗨,纪尧姆…我想我能够解决它..t尽管我使用了矢量…非常感谢你的帮助:)我可能会再问一次,但你真的帮了我一把谢谢:)谢谢我要试试:)
} catch (SQLException e) {
// Always log or print an exception
} catch (ClassNotFoundException e) {
e.printStackTrace();
// If this exception occurs, the rest of the code is pretty much useless since you won't have a connection to the DB. You should rather forward this exception as an error
}
// To make the column a check box
public Class getColumnClass(int c) {
return getValueAt(0, c).getClass();
}
public boolean isCellEditable(int row, int col) {
return false;
}
public void setValueAt(Object value, int row, int col) {
data[row][col] = value;
fireTableCellUpdated(row, col);
}
for (int i = 1; i <= columns; i++) {
columnNames[i-1] ...
for (int i = 0; i < columns; i++) {
columnNames[i] ...