mysql连接到主机

Question

we are trying to connect to the host using the code shown below:

 Connection con=null;
             try {
                 Class.forName("com.mysql.jdbc.Driver");
                    con=DriverManager.getConnection("jdbc:mysql://sql3.000webhost.com/a17644_cc","chat_cc",                       "pass");          
                 ResultSet rs;
                 if(!con.isClosed())
                 {
                Statement st = con.createStatement();

                  rs= st.executeQuery("SELECT * FROM  user_info");
                 while(rs.next()){
                    t1.append(rs.getString(3));
                 }
                 }
               } catch(Exception e) {
                   t1.setText(e.toString());
                 //e.printStackTrace();
               } finally {
                 try {
                   if(con != null)
                     con.close();
                 }catch (java.sql.SQLException e) {
                    // TODO Auto-generated catch block
                    //e.printStackTrace();
                     t1.setText(e.toString());
                }

we have given internet permission also in the manifest file.

But getting the following error:

java.sql.exception: data source rejected establishment of connection , message from server:" Host '182.71.248.226. is not allowed to connect to this MySQL server "

This is the following details i got: please tell which name we must give in the connection string Domain chitchat.site90.net Username a1740644 Password * Disk Usage 0.14 / 1500.0 MB Bandwidth 100000 MB (100GB) Home Root /home/a1740644 Server Name server19.000webhost.com IP Address 31.170.160.83 Apache ver. 2.2.19 (Unix) PHP version 5.2. MySQL ver. 5.1 Activated On 2012-05-01 02:14 Status Active

Answer 1

That error is telling you that the user does not have rights to connect and select the database. You need to either grant rights to all hosts, or hosts from the specific IP address you are using. To grant to all hosts, you'd have to issue this as an administrative user:

GRANT ALL ON a17644_cc.* TO 'chat_cc'@'%'

or alternatively

GRANT ALL ON a17644_cc.* TO 'chat_cc'@'182.71.248.226'

Assuming that the IP in question is static, and you want to constrain the connection by IP.

Answer 2

As pointed out by https://stackoverflow.com/a/1559992/700926 this is probably a security precaution. Check out the accepted answer to that question.

Answer 3

MySQL服务器的端口号是多少？

Answer 4

除了gview的答案之外，您还可以在MySQL Workbench中设置权限。导航到“安全性->用户和特权”。