Penrose连接Mysql解决方案
最近一直在进行Penrose连接Mysql的尝试，可总是提示无法连接到Mysql，无论是检查端口是否开启，设置Mysql远程访问权限等都不管用，后来在Penrose的官网找到一个建立样例数据库及设置远程连接的文档，没想到一举成功，痛快啊！
下面就把文档和大家共享一下！（是英文，大家就凑合着看下吧！因为最近搞Penrose太累了，懒的再去翻译了！）
我安装的Penrose版本是2.0的，Mysql是5.0
The following are the instructions to setup the sample database. The instructions were written for MySQL 4.x, but you can use other database systems.
Create Database
Make sure you have a MySQL server running on your local machine. Create a MySQL database called "penrose_demo". Exececute the following commands inside a MySQL client:
create database penrose_demo;
Create Database User
Create a MySQL user called "penrose" with password "penrose". Exececute the following commands inside a MySQL client:
grant all privileges on *.* to 'penrose'@'<hostname>' identified by 'penrose' with grant option;
grant all privileges on *.* to 'penrose'@'localhost' identified by 'penrose' with grant option;
grant all privileges on *.* to 'penrose'@'%' identified by 'penrose' with grant option;
注：主要是这边关于权限的设置导致我总是连接不成功！有高手能详细解释下不？
Change the <hostname> with your machine name.
Create Database Tables
Populate the database with the SQL script provided in PENROSE_HOME/samples/sql. Exececute the following commands inside a MySQL client:
use penrose_demo;
source PENROSE_HOME/samples/sql/example.sql;
注：此脚本在相应目录中没有，需自己准备sql脚本！可在mysql官网上下载到！
The script was written for MySQL 4.x. If you are using a different database system, you might need to modify the script.
相关文档：
MYSQL中修改表结构ALTER用法
ALTER TABLE Result ADD xinlinDoc longblob;
ALTER TABLE Result ADD xinlinDocName varchar(50);
其它实例：
CREATE TABLE t1(a INTEGER,b CHAR(10)); // 创建的表t1开始
ALTER TABLE t1 RENAME t2; // 重命名表，从t1到t2
ALTER TABLE t2 MODIFY a TINYINT NOT NULL, CHANGE b c CHAR( ......
mysql 截取某一个时间(datetime类型)的日期：
方法1：select date(row_name) from table_name where row = row1;
方法2：select left(row_name, 10) from table_name where row = row1;
方法3：select cast(row_name as char[10]) from table_name where row = row1;
取得某个日期的time_t数值：select unix_times ......
有2个不同的方法增加用户：通过使用GRANT语句或通过直接操作MySQL授权表。比较好的方法是使用GRANT语句，因为他们是更简明并且好像错误少些。
下面的例子显示出如何使用MySQL客户安装新用户。这些例子假定权限已缺省被安装。这意味
着为了改变，你必须在MySQL正在运行同一台机器上，你必须作为MySQL
ro ......
他将多个表在逻辑上当作一个表来查询。他建立后有两个文件，
.frm 表结构定义
.mrg union表的名字清单
两个基本表:
CREATE TABLE TEST_MERGE_1(
ID INT(5) NOT NULL,
VALUE VARCHAR(100) NOT NULL,
PRIMARY KEY(ID)
)
CREATE TABLE TEST_MERGE_2(
ID INT(5) NOT N ......
