create_PaperBean.java

package Beans;

import java.sql.SQLException;
import java.sql.Statement;
import java.util.logging.Level;
import java.util.logging.Logger;

public class create_paperBean extends org.apache.struts.action.ActionForm {

    private String table_name;

    public String getTable_name() {
        return table_name;
    }

    public void setTable_name(String table_name) {
        this.table_name = table_name;
    }
    public String createDB(){
        String str = "creation_failed";
        try{   
            Statement st = DBConnection.DBConnection.DBConnect();
            int insert = st.executeUpdate("CREATE TABLE "+table_name+"(ques_no int(11) NOT NULL PRIMARy KEY,"
                    + "ques_name varchar(45),ans1 varchar(45),ans2 varchar(45),ans3 varchar(45),"
                    + "ans4 varchar(45),correct_ans varchar(45))");            
            System.out.println(insert);
            if(insert > 0)
                str = "created";            
        } catch (SQLException ex) {
            Logger.getLogger(create_paperBean.class.getName()).log(Level.SEVERE, null, ex);
        }  
        return str;
    }
}

我正在使用struts，当执行该bean时，会在数据库中创建一个表，但是insert的值仍为零！因此，我无法进入正确的页面来进一步运行Web应用程序。我究竟做错了什么？