MySQL字段加密和解密

1.加密：aes_encrypt(‘admin‘,‘key‘)
     解密：aes_decrypt(password,‘key‘)
    
2.双向加密      通过密钥去加密，解密的时候的只有知道这个密钥的人来解密
      加密：encode()
      解密：decode()
      eg:encode(‘123456‘ ‘adfdgfdhggfh‘);
           decode(password,‘adfdgfdhggfh‘);
3.PASSWORD(‘123456‘)
    password加密是不可逆转的

4.MD5(‘123456‘)

//UserDao 
public User login(Connection con,User user) throws Exception{
        User resultUser=null;
        String sql="select userName,AES_DECRYPT(password,‘key‘) password from t_user where userName=? and AES_DECRYPT(PASSWORD,‘key‘)=?";
        PreparedStatement pstmt=con.prepareStatement(sql);
        pstmt.setString(1, user.getUserName());
        pstmt.setString(2, user.getPassword());
        ResultSet rs=pstmt.executeQuery();
        if(rs.next()){
            resultUser=new User();
            resultUser.setUserName(rs.getString(1));
            resultUser.setPassword(rs.getString(2));
            System.out.println(resultUser.getPassword()+"^^^^^");
        }
        return resultUser;
    }
}
   
 //sql语句 
 insert into t_user (userName,password) values(‘admin‘,AES_ENCRYPT(‘123456‘,‘key‘));  
 select userName,AES_DECRYPT(password,‘key‘)password from t_user;