如何显示从数据库到jtable的所有数据

Question

我们在数据库中有一个名为data的表，我们希望使用NetBeans IDE在JTable组件中检索和显示所有数据。数据库中的每一行都应该显示在jtable中。

Answer 1

在没有任何关于这方面细节的信息的情况下，我建议您从一个关于如何从数据库提取数据的JDBC教程开始。然后，JTable教程将帮助您显示这些内容。

Answer 2

另外，请记住MVC是游戏的名称。扩展AbstractTableModel以创建一个将向JTable提供数据的模型。

您将需要实现以下方法:

public int getRowCount()
public int getColumnCount() and 
public Object getValueAt(int rowIndex, int columnIndex)

最后将模型设置为JTable:

    myJTable.setModel(new MyModel());

像这样:

public class MyModel extends AbstractTableModel {
    private Connection con;
    private Statement stmt;
    private ResultSet rs;
    public MyModel () {
        try {
            Class.forName("com.mysql.jdbc.Driver");
            try {
                con = DriverManager.getConnection("jdbc:mysql://localhost:3306/databasename?useUnicode=true&characterEncoding=UTF-8",
                        "root", "password");
                stmt = con.createStatement(ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY);
                rs = stmt.executeQuery("select * from tablename");
            } catch (SQLException e) {
                String msg = "MyModel(): Error Connecting to Database:n"
                        + e.getMessage();
                System.out.println(msg);
            }
        } catch (ClassNotFoundException e) {
            String msg = "The com.mysql.jdbc.Driver is missingn"
                    + "install and rerun the application";
            System.out.println(msg);
            System.exit(1);
        } finally {
        }
    }
    public int getRowCount() {
// count your rows and return 
        return count;
    }
    public int getColumnCount() {
// how many cols will you need goes here
        return 3;
    }
    public Object getValueAt(int rowIndex, int columnIndex) {
        try {
            rs.absolute(rowIndex + 1);
            switch (columnIndex) {
                case 0: 
                    return rs.getInt(1);
                case 1:
                    return rs.getString(2);
                case 2:
                    return rs.getString(6);
                default:
                    return null;
            }
        } catch (SQLException ex) {
            System.out.println(ex.getMessage());
        }
        return null;
    }
}

Answer 3

您可以导入DbUtils并使用它将数据库导入到JTable中，如下所示:

Class.forName("com.mysql.jdbc.Driver");
Connection connectionToDB = (Connection)DriverManager.getConnection(hostname, user,pw);
PreparedStatement preparedStatement = connectionToDB.prepareStatement("SELECT * FROM Table;");
ResultSet resultSetForFullTable = preparedStatement.executeQuery();
dbTable.setModel(DbUtils.resultSetToTableModel(resultSetForFullTable));

DbUtils的导入语句如下

import net.proteanit.sql.DbUtils;