• 引號問題

String?sql?=?"INSERT?INTO?bs_bookstore(storeName)?VALUES?("+"'?')";

為什么老師演示的過程中不加單引號也可以，我自己試了卻不行？

• Parameter index out of range問題
  

public?void?addBookStore(BookStore?bs)?throws?Exception{
????????Connection?conn?=?DBUtils.getConnection();
????????String?sql?=?"INSERT?INTO?bs_bookstore(storeName)?VALUES?("+"'?')";
????????PreparedStatement?psmt?=?conn.prepareStatement(sql);
????????//psmt.setInt(1,?bs.getMainId());
????????psmt.setString(1,?bs.getStoreName());
????????psmt.execute();
????????
????????System.out.println(sql);
????????System.out.println("------------------"+psmt.execute()+"------------------");
????????
????}

增加方法如上所示，測試方法如下所示

public?static?void?main(String[]?args)?{

????????BookStore?bs?=?new?BookStore("test");
????????BookStoreDao?bsd?=?new?BookStoreDao();
????????try?{
????????????bsd.addBookStore(bs);
????????}?catch?(Exception?e)?{
????????????//?TODO?Auto-generated?catch?block
????????????e.printStackTrace();
????????}
????}

控制臺報錯：

Parameter index out of range (1 > number of parameters, which is 0).
?? ?at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1075)
?? ?at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:989)
?? ?at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:984)
?? ?at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:929)
?? ?at com.mysql.jdbc.PreparedStatement.checkBounds(PreparedStatement.java:3700)
?? ?at com.mysql.jdbc.PreparedStatement.setInternal(PreparedStatement.java:3684)
?? ?at com.mysql.jdbc.PreparedStatement.setString(PreparedStatement.java:4535)
?? ?at com.cjt.dao.BookStoreDao.addBookStore(BookStoreDao.java:21)
?? ?at com.test.Test.main(Test.java:13)

是說psmt.setString(1, bs.getStoreName())這一行有錯嗎？有啥錯??？？？求教。。。。。

PS：我設置了主鍵mainId自增