Question

我是研究Java，SQL的junho。

现在我正在为以下问题而苦苦挣扎。

首先，当我尝试将20020202放入此字段时，发生有关意外数据类型的错误。但是，我不知道如何将数字更改为“日期”

第二，我不知道如何使JTable方法输入到下面这部分。

DefaultTableModel model = new DefaultTableModel(data, columnNames);
JTable table1 = new JTable(model);
table1.setColumnSelectionAllowed(true);
table1.setCellSelectionEnabled(true);

JScrollPane scrollPane = new JScrollPane(table1);        
scrollPane.setBounds(10, 53, 600, 200);
addGrid(gbl,gbc,scrollPane,0,4,2,3,0,0);

因为我不输入以下代码，

import java.awt.Component;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.Date;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.Statement;
import java.util.Vector;

import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableColumn;

public class DbPanel extends JPanel{



public DbPanel() {

    Vector columnNames = new Vector();
    Vector data = new Vector();
    JPanel panel = new JPanel();   //
    JPanel panel2 =new JPanel();


    GridBagLayout gbl = new GridBagLayout();
    GridBagConstraints gbc = new GridBagConstraints();
    gbc.fill = GridBagConstraints.BOTH;
    setLayout(gbl);


    //DB 관리
/*      String url = "jdbc:oracle:thin:@localhost:1521:xe";
    String user = "madang";
    String password = "madang";

    try {
        Class.forName("oracle.jdbc.driver.OracleDriver"); 
        Connection con = DriverManager.getConnection(url, user, password);
        String sql = "select * from STOCK_INFO order by DATE_STOCK";
        Statement statement = con.createStatement();
        ResultSet resultSet = statement.executeQuery(sql);
        ResultSetMetaData metaData = resultSet.getMetaData();
        int columns = metaData.getColumnCount();
        for (int i = 1; i <= columns; i++) {
            columnNames.addElement(metaData.getColumnName(i));
        }
        while (resultSet.next()) {
            Vector row = new Vector(columns);
            for (int i = 1; i <= columns; i++) {
                row.addElement(resultSet.getObject(i));
            }
            data.addElement(row);
        }
        resultSet.close();
        statement.close();
    } catch (Exception e) {
        System.out.println(e);
    }*/
    //DB 끝


     JLabel label = new JLabel("start_date");
        addGrid(gbl,gbc,label,0,0,1,1,0,0);

        JTextField textfield = new JTextField(8);
        addGrid(gbl,gbc,textfield,0,1,1,1,0,0);


        JLabel label2 = new JLabel("end_date");
        addGrid(gbl,gbc,label2, 2,0,1,1,0,0);
        JTextField textfield2 = new JTextField(8);
        addGrid(gbl,gbc,textfield2, 2,1,1,1,0,0);

        JButton btn = new JButton("search");
        addGrid(gbl, gbc, btn, 2, 4, 1, 3, 0, 0);


        JLabel lblNewLabel = new JLabel("Stock_database");
        lblNewLabel.setHorizontalAlignment(SwingConstants.CENTER);
        lblNewLabel.setFont(new Font("Tahoma", Font.BOLD, 14));
       /* lblNewLabel.setBounds(10, 11, 927, 31);*/
        addGrid(gbl,gbc,lblNewLabel,0,3,4,1,1,0);

        DefaultTableModel model = new DefaultTableModel(data,                 columnNames);
        JTable table1 = new JTable(model);
        table1.setColumnSelectionAllowed(true);
        table1.setCellSelectionEnabled(true);

        JScrollPane scrollPane = new JScrollPane(table1);        
        scrollPane.setBounds(10, 53, 600, 200);
        addGrid(gbl,gbc,scrollPane,0,4,2,3,0,0);

        btn.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {

                String url = "jdbc:oracle:thin:@localhost:1521:xe";
                String user = "madang";
                String password = "madang";

                try {
                    Class.forName("oracle.jdbc.driver.OracleDriver"); 
                    Connection con = DriverManager.getConnection(url,     user, password);
                    String sql = "select * from stock_info     between"+textfield.getText()+"and"+textfield2.getText();
                    Statement statement = con.createStatement();
                    ResultSet resultSet = statement.executeQuery(sql);
                    ResultSetMetaData metaData = resultSet.getMetaData();
                    int columns = metaData.getColumnCount();
                    for (int i = 1; i <= columns; i++) {
                        columnNames.addElement(metaData.getColumnName(i));
                    }
                    while (resultSet.next()) {
                        Vector row = new Vector(columns);
                        for (int i = 1; i <= columns; i++) {
                            row.addElement(resultSet.getObject(i));
                        }
                        data.addElement(row);
                    }
                    resultSet.close();
                    statement.close();
                } catch (Exception e1) {
                    System.out.println(e1);
                }


            }
        });



/*          TableColumn column;
        for (int i = 0; i < table1.getColumnCount(); i++) {
            column = table1.getColumnModel().getColumn(i);
            column.setMaxWidth(250);
        }*/




}

private void addGrid(GridBagLayout gbl, GridBagConstraints gbc, Component c, int gridx, int gridy, int gridwidth, int gridheight, int weightx, int weighty) {
    gbc.gridx = gridx;
    gbc.gridy = gridy;
    gbc.gridwidth = gridwidth;
    gbc.gridheight = gridheight;
    gbc.weightx = weightx;
    gbc.weighty = weighty;
    gbl.setConstraints(c, gbc);
    add(c);
}


}

该表未显示。

因此，我想知道如何解决此问题。我的英语写作能力不好。因此，对于您而言，这将是不够的信息。我希望有人给我建议。

这是我编写的整个代码。我希望它能帮助您了解我正在努力解决的问题。非常感谢。

{{1}}

Answer 1

首先，当我尝试将20020202放入此字段时，发生有关意外数据类型的错误。但是，我不知道如何将数字更改为“日期”

将String日期解析为年，月和日值。然后，您可以创建一个Calendar 对象：

Calendar date = new Calendar(...);

一旦有了Calendar对象，就可以使用以下方法创建SQLDate：

Date sqlDate = new Date( date.getTimeInMillis() );

请注意，您应该使用java.sql.Date类，而不是java.util.Date类。

该表未显示。

该表未显示，因为创建模型时列为空。拥有有效数据后，您需要创建模型。

因此代码应类似于：

//DefaultTableModel model = new DefaultTableModel(data, columnNames);
//JTable table1 = new JTable(model);
JTable table1 = new JTable(); // create empty table to add to scroll pane

然后，从ResultSet中获取数据之后，您可以创建模型并将其分配给表：

resultSet.close();
statement.close();

DefaultTableModel model = new DefaultTableModel(data, columnNames);
table1.setModel( model );

连接问题（JTextfield，Jtable，sql数据库）

1 个答案: