Java sql server数据插入错误
我尝试此代码这是在mssqlserver中传递值的问题我在hear nrno中将值一页传递到另一页是值到达另一页,但hear错误是java.sql.SQLException:列名“nrno”无效Java sql server数据插入错误,java,sql-server,Java,Sql Server,我尝试此代码这是在mssqlserver中传递值的问题我在hear nrno中将值一页传递到另一页是值到达另一页,但hear错误是java.sql.SQLException:列名“nrno”无效 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>Untitled</title> </head> <bo
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Untitled</title>
</head>
<body>
<%@ page import="java.sql.*" %>
<%@ page import="java.io.*" %>
<%
String AppURL = request.getContextPath() ;
String thisFile = AppURL+request.getServletPath() ;
int nrno = 0;
try
{
nrno = Integer.parseInt(request.getParameter("rno"));
}
catch(NumberFormatException ex)
{
nrno = 0;
}
%>
<td>this is in roolno :- <%=nrno%> </td><br>
<%
Class.forName("net.sourceforge.jtds.jdbc.Driver");
Connection conn = DriverManager.getConnection("jdbc:jtds:sqlserver://localhost:1433/sample", "sa", "sa1234");
java.sql.Statement stmt = conn.createStatement();
try
{
int val = stmt.executeUpdate("INSERT student (name,rno) VALUES('nikki',+ nrno)");
out.println("1 row affected");
}
catch (SQLException s)
{
System.out.println("SQL statement is not executed!");
}
stmt.close();
conn.close();
%>
</body>
</html>
无标题
这是在鲁诺:-
您不需要以下内容吗
int val = stmt.executeUpdate("INSERT student (name,rno) VALUES('nikki'," + nrno + ")");
在上面的示例代码中,您没有插入nrno
的值,而是插入实际字符串nrno
本身(因为它位于双引号内)
接下来,我将进行调查,以便您可以执行以下操作:
PreparedStatement pstmt = con.prepareStatement("INSERT student (name,rno) VALUES(?,?)");
pstmt.setString(1, 'nikki');
pstmt.setInt(2, nrno);
并避免像上面那样的令人讨厌的引用问题,以及可能出现的SQL注入问题(我意识到上面可能是一个练习或类似的问题,但要注意这是一件好事)。修改它
int val = stmt.executeUpdate("INSERT student (name,rno) VALUES('nikki'," + nrno
+ ")");