我想用数据库列(SQLite)填充JComboBox。Java - 用SQLite数据库填充JCombobox
我的数据库连接是通过一个名为DatabaseConnection的类在安装包中设置的。
这里是如何看起来像
import java.sql.*;
import javax.swing.JOptionPane;
public class DatabaseConnection {
Connection conn = null;
public static Connection ConnectDB() {
try {
Class.forName("org.sqlite.JDBC");
Connection conn = DriverManager.getConnection("jdbc:sqlite:database.db");
JOptionPane.showMessageDialog(null, "Connection Established");
conn.setAutoCommit(false);
return conn;
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
return null;
}
}
}
在我的JFrame类我创建了下面的方法,它根据一个YouTube教程应该工作
public void PopulateJCB()
{
String queryString = "SELECT DISTINCT [Account Name] FROM main ORDER BY [Account Name]";
try
{
Connection statJCBaccountname = DatabaseConnection.ConnectDB();
Statement stmt = statJCBaccountname.createStatement();
ResultSet rsJCBaccountname = stmt.executeQuery(queryString);
while (rsJCBaccountname.next())
{
comboAccountName.addItem(rsJCBaccountname.getString(1));
}
catch (SQLException e)
{
e.printStackTrace();
}
}
但它显示下面的“comboAccountName错误.addItem(rsJCBaccountname.getString(1));”
Multiple markers at this line
- Type safety: The method addItem(Object) belongs to the raw type JComboBox. References to generic type JComboBox<E> should be
parameterized
- comboAccountName cannot be resolved
请帮忙!
无关:请学习Java命名约定并严格遵守。 – kleopatra