我正在尝试从 MYSQL DB 捕获参数并通过 spring mvc 将其打印在 JSP 页面上。
我的 Controller 中有以下功能:
@RequestMapping(value = "/showentry")
public ModelAndView showentry(@RequestParam("id") String id){
System.out.println("xxxxxxxxxxxxxxxxxxxxxxxx" + id);
entries = dao.search(id);
ModelAndView mav = new ModelAndView();
mav.addObject("list", entries);
return mav;
}
从以下形式获取参数“Id”:
<form action="showentry">
<input type= "hidden" name="id" value = "${item.id}">
<button> Show Entry </button>
</form>
调用showentry方法的函数位于DAO类中:
@Override
public List<Entry> search(String id) {
List<Entry> res = new ArrayList<Entry>();
String sql = "SELECT * FROM Person WHERE Id = ? ;";
Connection conn = null;
PreparedStatement ps = null;
ResultSet resultSet = null;
try {
//open connection
conn = dataSource.getConnection();
//prepare the statement
ps = conn.prepareStatement(sql);
//bind parameters to preparedstatement
ps.setString(1, id);
//execute the statement
resultSet = ps.executeQuery(sql);
while (resultSet.next()) {
Entry entry = new Entry();
entry.setId(resultSet.getInt("id"));
entry.setCn(resultSet.getString("cn"));
entry.setSn(resultSet.getString("sn"));
entry.setPn(resultSet.getString("pn"));
res.add(entry);
}
} catch (SQLException ex) {
//[...]
}
return res;
}
我可以在日志上打印带有与条目相关的 id 的字符串,例如: xxxxxxxxxxxxxxxxxxxxxxxx 32
但是它不会打印在jsp上,并且返回错误:
net.tirasa.springaddressbook.SpringEntryDAO search
GRAVE: null
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '?' at line 1
sql字符串有问题吗?
最佳答案
您必须删除 resultSet = ps.executeQuery(sql);
中的参数
一定是
resultSet = ps.executeQuery();
请参阅Javadoc来自方法executeQuery(String sql)
:
Note:This method cannot be called on a PreparedStatement or CallableStatement
同时删除语句末尾的 ;
:
String sql = "SELECT * FROM Person WHERE Id = ?";
关于java - Spring mvc - jsp MySQLSyntaxErrorException,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31810083/