private static void testDatabase(){
        String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
        String dbUrl = "jdbc:sqlserver://192.168.1.110:1433;DatabaseName=testDataBase";
        String userName = "sa";
        String pwd = "123456";
        try {
            Class.forName(driverName);
            Connection conn = DriverManager.getConnection(dbUrl,userName,pwd);
            System.out.println("连接成功");
            String sql = "select * from CM_COMPETENCE";//错误sql语句
                        String sql = "select * from testDataBase.CM_COMPETENCE";//正确sql语句
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.execute();
            conn.close();
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("连接失败");
        }
    }