Java JSP MYSql自动生成密钥
我想创建自动生成的密钥。使用JDBC JSP自动生成密钥。我得到的错误为out.print（rs.next（））=false和 rs.getInt（1）=…帮助我解决我的问题..我是jsp的新手Java JSP MYSql自动生成密钥,java,jsp,Java,Jsp,我想创建自动生成的密钥。使用JDBC JSP自动生成密钥。我得到的错误为out.print（rs.next（））=false和 rs.getInt（1）=…帮助我解决我的问题..我是jsp的新手 <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@page import="java.sql.*" %>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@page import="java.sql.*" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
Connection con = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
try {
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.
getConnection("jdbc:mysql://localhost:3306/test?useSSL=false","root","root");
String query = "insert into emp2(name,department,salary) values (?,?,?)";
pstmt = con.prepareStatement(query, Statement.RETURN_GENERATED_KEYS);
pstmt.setString(1, "John");
pstmt.setString(2, "Acc Dept");
pstmt.setString(3, "10000");
pstmt.executeUpdate();
rs = pstmt.getGeneratedKeys();
out.print(rs.next());
rs.next();
%>
<p>Generated Emp Id: <%=rs.getInt(1)%> </p>
<%
}
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();
if(pstmt!= null) pstmt.close();
if(con!= null) con.close();
} catch(Exception ex){}
}
%>
</body>
</html>
在此处插入标题
生成的Emp Id：
<%
Connection con = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
try {
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.
getConnection("jdbc:mysql://localhost:3306/test?useSSL=false","root","root");
String query = "insert into emp2(name,department,salary) values (?,?,?)";
pstmt = con.prepareStatement(query, Statement.RETURN_GENERATED_KEYS);
pstmt.setString(1, "John");
pstmt.setString(2, "Acc Dept");
pstmt.setString(3, "10000");
pstmt.executeUpdate();
rs = pstmt.getGeneratedKeys();
// out.print(rs.next());
rs.next();
%>
<p>Generated Emp Id: <%=rs.getInt(1)%> </p>
<%
}
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();
if(pstmt!= null) pstmt.close();
if(con!= null) con.close();
} catch(Exception ex){}
}
%>
</body>
</html>
生成的Emp Id：