JDBC:灵活指定SQL中的变量（SXT）

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Demo
import java.sql.*;
import com.sun.org.apache.xalan.internal.xsltc.runtime.Parameter;
public class TestPrepState
{
    /**
     * PreparedStatement的简单使用
     * 灵活指定SQL中的变量
     * 手动输入参数
     */
    public static void main(String[] args)
    {
        // TODO Auto-generated method stub 
        if (args.length != 4)
        {
            System.out.println("Error,plesase input again!");
            System.exit(-1);
        }
        int userid = 0;
        try
        {
            userid = Integer.parseInt(args[0]);
        } catch (NumberFormatException e)
        {
            System.out.println("Number error");
            System.exit(-1);
        }
        String usernameString = args[1];
        String passwordString  = args[2];
        String userflaString = args[3];
        Connection conn = null;
        PreparedStatement pstmt = null;  
        //引用包的时候注意：这个PreparedStatement是java.sql中的，而不是com.mysql.jdbc中的那个PreparedStatement 
        ResultSet rs = null;
        try
        {
            Class.forName("com.mysql.jdbc.Driver");
            String url = "jdbc:mysql://localhost:3306/college";
            String user = "root";
            String password = "123456";
            conn = DriverManager.getConnection(url, user, password);
            pstmt = conn.prepareStatement("insert into user values(?,?,?,?)");
            pstmt.setInt(1, userid);
            pstmt.setString(2, usernameString);
            pstmt.setString(3, passwordString);
            pstmt.setString(4, userflaString);
            
            pstmt.executeUpdate();
            
            rs = pstmt.executeQuery("select * from user where userId='"+userid+"'");
            while (rs.next())
            {
                System.out.print("username:");
                System.out.println(rs.getString("userName"));
                System.out.print("password:");
                System.out.println(rs.getString("userPassword"));
            }
        } catch (ClassNotFoundException e)
        {
            // TODO Auto-generated catch block 
            e.printStackTrace();
        } catch (SQLException e)
        {
            // TODO Auto-generated catch block 
            e.printStackTrace();
        } finally
        {
            try
            {
                if (rs != null)
                {
                    rs.close();
                    rs = null;
                }
                if (pstmt != null)
                {
                    pstmt.close();
                    pstmt.close();
                }
                if (conn != null)
                {
                    conn.close();
                    conn = null;
                }
            } catch (SQLException e)
            {
                // TODO Auto-generated catch block 
                e.printStackTrace();
            }
        }
    }
}