java - 从用户查找数据库中的数据

Question

我试图让用户查找足球结果，数据库显示从数据库中得到的结果，但我不断收到此错误:

Exception in thread "main" java.sql.SQLException: [Microsoft][ODBC Microsoft Access Driver] Too few parameters. Expected 1.

这是我的“useFootballBean.java”bean:

package results;
import results.*;
import java.util.*;
import java.sql.*;
public class UseFootballBean
{
    public static void main(String[] args)
            throws SQLException, ClassNotFoundException
    {
        Scanner keyboard = new Scanner(System.in);
        String home;
        ResultsBean resultsBean = new ResultsBean();

        System.out.print("\nEnter Team: ");
        home = keyboard.next();
        home = resultsBean.getHome(home);
        if (home.equals(null))
            System.out.println(
                    "\n*** No such Team ***");
        else
        System.out.println("\nTeam " + home);
    }

这是我的“resultsBean.java”bean

package results;
import java.sql.*;
public class ResultsBean
{
    private Connection connection;
    private Statement statement;
    private ResultSet results;
    public String getHome(String enter)
                throws SQLException, ClassNotFoundException
    {
        String query;
        String team = null;
        connectAndCreateStatement();
        query = "SELECT * FROM Results WHERE homeTeam = "
            + enter;
        results = statement.executeQuery(query);
        if (results.next())
            team = results.getString("homeTeam");
        connection.close();
        return team;
    }

    private void connectAndCreateStatement()
                throws SQLException, ClassNotFoundException
    {
        Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
        connection = DriverManager.getConnection(
                                  "jdbc:odbc:FootballData","","");
        statement = connection.createStatement();
}
}

Answer 1

我认为您在与字符串值进行比较时缺少查询的 where 子句中所需的单引号。给你:

where keyword_name='"+keyword_name+"'"

 query = "SELECT * FROM Results WHERE homeTeam = " + '"+ enter + "'";