添加selectOneByExample接口 · Pull Request !6 · abel533/Mapper

可以使用Example查询一条记录。

测试代码:
```
    System.out.println(JSON.toJSONString(sysLogService.find()));
    。
    。
    。
    @Override
    public SysLog find() {
        Example example = new Example(SysLog.class);
        example.orderBy("id").desc();
        return mapper().selectOneByExample(example);
    }
```
查询日志：
```
2016-10-18 14:59:29.631 [DEBUG] org.mybatis.spring.transaction.SpringManagedTransaction: JDBC Connection [com.alibaba.druid.proxy.jdbc.ConnectionProxyImpl@16eedaa6] will not be managed by Spring
2016-10-18 14:59:29.634 [DEBUG] cn.loioi.multi.mysql.been.SysLogMapper.selectOneByExample: ==>  Preparing: SELECT id,user,type,title,host,content,create_time,update_time,delete_time FROM sys_log order by id DESC LIMIT 1 
2016-10-18 14:59:29.740 [DEBUG] cn.loioi.multi.mysql.been.SysLogMapper.selectOneByExample: ==> Parameters: 
2016-10-18 14:59:29.765 [DEBUG] cn.loioi.multi.mysql.been.SysLogMapper.selectOneByExample: <==      Total: 1
2016-10-18 14:59:29.766 [DEBUG] org.mybatis.spring.transaction.SpringManagedTransaction: Committing JDBC Connection [com.alibaba.druid.proxy.jdbc.ConnectionProxyImpl@16eedaa6]
2016-10-18 14:59:29.766 [DEBUG] org.mybatis.spring.SqlSessionUtils: Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@50f40653]
```
查询结果输出：
```
{"createTime":"2016/09/28 12:06","host":"0.0.0.0","id":80,"type":0,"user":"system"}
```

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