Solve the mysql8.0. 15 configuration problem of javaweb in idea
- 2021-07-26 07:46:30
- OfStack
mysql after 8.0. x is somewhat different when connecting to the database.
First:
Class.forName("com.mysql.cj.jdbc.Driver");
Secondly:
DriverManager.getConnection("jdbc:mysql://localhost:3306/java?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=UTC", "root", "passwd");
In addition, it is worth noting that the javaweb project created in idea lacks 1 folder, such as an important lib folder (I don't know if I don't have it), and then the jar driver package can be used normally in lib.
Finally, put a complete code for reference.
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8" import="java.sql.*"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>jdbc</title>
</head>
<body>
<%
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
int age = -1;
String name = null;
int id = -1;
try{
Class.forName("com.mysql.cj.jdbc.Driver");
}catch (Exception e){
out.print(" Connection failed ");
}
try{
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/java?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=UTC", "root", "1");
out.print(" Connection succeeded ");
ps = conn.prepareStatement("select * from name ");
rs = ps.executeQuery();
while (rs.next()){
age = rs.getInt("age");
name = rs.getString("name");
out.print("<br>" + "age:" + age + " "+ "name:" + name);
}
}catch (SQLException e){
out.println(e.getMessage());
out.println(e.getSQLState());
out.println(e.getErrorCode());
}
%>
</body>
</html>
Summarize