Question

I’m trying to connect to a mysql database using Connector/J but get the same message no matter what code I use. I can connect to it manually with the mysql command on debian just fine.

The error is You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '????????????????' at line 1

The latest code is:

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class E{
  public void connect(){
    try{
      Class.forName("com.mysql.jdbc.Driver").newInstance();
      conn = DriverManager.getConnection(
           "jdbc:mysql://192.168.1.3:3306/dbname?user=dbuser&password=dbpw");
    }catch( Exception e){
      System.out.printf("Something went wrong: "+e.getMessage());
  }
}

It fails at the getConnection call. I used print statements to figure this out as NetBeans doesn’t have a problem with this (but when I put in a bad host and run it from NetBeans it doesn’t complain either).

I get the exact same problem with DataSource

import java.sql.*;
import javax.sql.*;
...
com.mysql.jdbc.jdbc2.optional.MysqlDataSource ds
    = new com.mysql.jdbc.jdbc2.optional.MysqlDataSource();
ds.setServerName("192.168.1.3");
ds.setPortNumber(3306);
ds.setDatabaseName("dbname");
ds.setUser("dbuser");
ds.setPassword("dbpw");
conn = ds.getConnection();
...

Something is working because if I put in a bad password I get an access denied message.
I’m using mysql-connector-java-5.1.22-bin.jar and had the same problem with 5.1.21.

Answer 1

I found the following: Stumped SQL Exception for JDBC

In a nutshell, the server my.cnf file needs:

character_set_server=utf8
collation_server=utf8_general_ci

It also said the GCJ (gnu java compiler) is dicey, but I didn’t replace it