SQL – Daoyuan Li

Migrating JComments to WordPress

Published 2012/04/28 by Daoyuan Li

I switched back to WordPress from Joomla! after I registered this new domain. After migrated all the posts to WordPress using FG Joomla to WordPress, I noticed the comments have not been transferred. After some digging I didn’t find satisfactory plugin to do that, so I wrote my own PHP script to fulfill this task. The code is also available from GitHub.

<?php

$username = "username";
$password = "password";
$database = "database";

mysql_connect('localhost', $username, $password);
@mysql_select_db($database) or die( "Unable to select database");
@mysql_set_charset('utf8');

$query = "SELECT DISTINCT object_id FROM jos_jcomments";
echo $query; 
print "
";
$pids = mysql_query($query);

if (!$pids) {
	echo mysql_error();
}
$num = mysql_numrows($pids);
$i = 0;
while ($i < $num) {
	$pid = mysql_result($pids, $i, "object_id");
	$query = "SELECT created FROM  jos_content WHERE id = " . $pid;
	echo $query; 
	print "
	";
	$created = mysql_query($query);
	if (!$created) {
		echo mysql_error();
	}
	$ct = mysql_result($created, 0, "created");
	$query = "SELECT ID FROM  wp_posts WHERE  post_date =  '" . $ct . "' AND post_type =  'post'";
	echo $query; 
	print "
	";
	$wpids = mysql_query($query);
	if (!$wpids) {
		echo mysql_error();
	}
	$wpid = mysql_result($wpids, 0, "ID");
	$query = "SELECT * FROM jos_jcomments WHERE object_id = " . $pid;
	echo $query; 
	print "
	";
	$comments = mysql_query($query);
	$comments_count = mysql_numrows($comments);
	$j = 0;
	while ($j < $comments_count) {
		$author = mysql_result($comments, $j, "name");
		$email = mysql_result($comments, $j, "email");
		$url = mysql_result($comments, $j, "homepage");
		$ip = mysql_result($comments, $j, "ip");
		$cdate = mysql_result($comments, $j, "date");
		$content = mysql_result($comments, $j, "comment");
		$content = mysql_real_escape_string($content);
		
		$query = "INSERT INTO wp_comments (comment_post_ID, comment_author, comment_author_email, comment_author_url, comment_author_IP, comment_date, comment_date_gmt, comment_content) VALUES (" . $wpid . ", '" . $author . "', '" . $email . "', '" . $url . "', '" . $ip . "', '" . $cdate . "', '" . $date . "', '" . $content . "')";
		echo $query; 
		print "
		";
		mysql_query($query);
		$j++;
	}
	$query = "UPDATE wp_posts SET comment_count = " . $comments_count . " WHERE ID = " . $wpid;
	echo $query; 
	print "
	";
	mysql_query($query);

	$i++;
}
mysql_close();
?>

<?php

$username = "username";

$password = "password";

$database = "database";

mysql_connect('localhost', $username, $password);

@mysql_select_db($database) or die( "Unable to select database");

@mysql_set_charset('utf8');

$query = "SELECT DISTINCT object_id FROM jos_jcomments";

echo $query;

print "

$pids = mysql_query($query);

if (!$pids) {

echo mysql_error();

}

$num = mysql_numrows($pids);

$i = 0;

while ($i < $num) {

$pid = mysql_result($pids, $i, "object_id");

$query = "SELECT created FROM jos_content WHERE id = " . $pid;

echo $query;

print "

$created = mysql_query($query);

if (!$created) {

echo mysql_error();

}

$ct = mysql_result($created, 0, "created");

$query = "SELECT ID FROM wp_posts WHERE post_date = '" . $ct . "' AND post_type = 'post'";

echo $query;

print "

$wpids = mysql_query($query);

if (!$wpids) {

echo mysql_error();

}

$wpid = mysql_result($wpids, 0, "ID");

$query = "SELECT * FROM jos_jcomments WHERE object_id = " . $pid;

echo $query;

print "

$comments = mysql_query($query);

$comments_count = mysql_numrows($comments);

$j = 0;

while ($j < $comments_count) {

$author = mysql_result($comments, $j, "name");

$email = mysql_result($comments, $j, "email");

$url = mysql_result($comments, $j, "homepage");

$ip = mysql_result($comments, $j, "ip");

$cdate = mysql_result($comments, $j, "date");

$content = mysql_result($comments, $j, "comment");

$content = mysql_real_escape_string($content);

$query = "INSERT INTO wp_comments (comment_post_ID, comment_author, comment_author_email, comment_author_url, comment_author_IP, comment_date, comment_date_gmt, comment_content) VALUES (" . $wpid . ", '" . $author . "', '" . $email . "', '" . $url . "', '" . $ip . "', '" . $cdate . "', '" . $date . "', '" . $content . "')";

echo $query;

print "

mysql_query($query);

$j++;

}

$query = "UPDATE wp_posts SET comment_count = " . $comments_count . " WHERE ID = " . $wpid;

echo $query;

print "

mysql_query($query);

$i++;

}

mysql_close();

15 Comments

使用Oracle Job实现定时向管理员发送信息

Published 2010/07/06 by Daoyuan Li

1.构造实现功能（发送消息）的存储过程：

CREATE OR REPLACE PROCEDURE "ADMIN"."SEND_EMP_BIRTHDAY_MSG" is
 cursor emp_cursoris
 select eid, ename
 from admin.employee
 where to_char(sysdate, 'mm-dd') = to_char(birthdate, 'mm-dd');
eid number(5);
 ename varchar2(20);
 msgdesc varchar2(3000);
begin
 msgdesc := '';
 for rname in emp_cursor loop
 msgdesc := msgdesc || '\n员工编号： ' || rname.eid
|| ' 员工姓名： ' || rname.ename;
 end loop;
 if length(msgdesc) &gt; 0
 then
 msgdesc := '今天是以下员工的生日：\n' || msgdesc;
insert into admin.messagevalues(admin.msgid_sequence.nextval,
sysdate, '系统提示', 'admin', msgdesc, 1, 1, 0);
dbms_output.put_line(msgdesc);
end if;
dbms_output.put_line(msgdesc);
end;

CREATE OR REPLACE PROCEDURE "ADMIN"."SEND_EMP_BIRTHDAY_MSG" is

cursor emp_cursoris

select eid, ename

from admin.employee

where to_char(sysdate, 'mm-dd') = to_char(birthdate, 'mm-dd');

eid number(5);

ename varchar2(20);

msgdesc varchar2(3000);

begin

msgdesc := '';

for rname in emp_cursor loop

msgdesc := msgdesc || '\n员工编号： ' || rname.eid

|| ' 员工姓名： ' || rname.ename;

end loop;

if length(msgdesc) > 0

then

msgdesc := '今天是以下员工的生日：\n' || msgdesc;

insert into admin.messagevalues(admin.msgid_sequence.nextval,

sysdate, '系统提示', 'admin', msgdesc, 1, 1, 0);

dbms_output.put_line(msgdesc);

end if;

dbms_output.put_line(msgdesc);

end;

2.创建JOB：

variable job1 number;
begin
dbms_job.submit(:job1,'send_emp_birthday_msg;',sysdate,'sysdate+1');
--每天运行send_emp_birthday_msg过程一次
end;

variable job1 number;

begin

dbms_job.submit(:job1,'send_emp_birthday_msg;',sysdate,'sysdate+1');

--每天运行send_emp_birthday_msg过程一次

end;

3. 运行JOB：

begin
dbms_job.run(:job1);
end;

begin

dbms_job.run(:job1);

end;

每隔一定时间间隔查询是否有新消息

Published 2010/07/06 by Daoyuan Li

/**
 * 查询信息
 */
public void checkMessage(){
    TimerTask tt = new TimerTask() {
        public void run() {
            String unreadMsgNo = new CheckMessage().getUnreadMsgNo
                                    (URL, USER,
PASSWORD);
            if(unreadMsgNo.equals("0")){
                jLabelMsgTip.setText("您没有新信息！");
            } else{
                jLabelMsgTip.setText("您有" + unreadMsgNo + "条新信息！");
            }
        }
    };
    Timer t = new Timer();
    t.schedule(tt, 0, (long)1000*15);//每隔15秒执行一次
}

/**

* 查询信息

public void checkMessage(){

TimerTask tt = new TimerTask() {

public void run() {

String unreadMsgNo = new CheckMessage().getUnreadMsgNo

(URL, USER,

PASSWORD);

if(unreadMsgNo.equals("0")){

jLabelMsgTip.setText("您没有新信息！");

} else{

jLabelMsgTip.setText("您有" + unreadMsgNo + "条新信息！");

}

};

Timer t = new Timer();

t.schedule(tt, 0, (long)1000*15);//每隔15秒执行一次

}

Oracle VPD策略实现行级安全性

Published 2010/07/06 by Daoyuan Li

VPD 即Virtual Private Databases，提供了对数据库的精密访问控制 (graind access control (FGAC) ），使用VPD,可以在数据记录集定义用户的访问权限。

通过VPD 策略，相当于用户操作数据库中的数据时隐式添加一些条件。比如我们要实现特定角色只能操作数据库表中的特定行的数据，这就可以用 VPD 策略实现。现在以车队长只能操作员工表中的属于他的车队的员工的数据信息为例具体说明：

1. 构造策略函数：

CREATE OR REPLACE FUNCTION "VPD"."FUN_MOTORCADE" (
 p_schema in varchar2, p_table in varchar2
)
return varchar2
as
 l_retstr varchar2(100);
 eid number(5, 0);
 did number(5, 0);
begin
 if lower(user)<> 'admin'
 then
 l_retstr := null;
 for user_rec in
 (
 select eid, did
 from dpmanager
 where loginname = lower(user)
 ) loop
 eid := user_rec.eid;
 did := user_rec.did;
 end loop;
 l_retstr := 'did = ' || did ;--|| 'eid = ' || eid;
 return l_retstr;
 else
 l_retstr := null;
 return l_retstr;
 end if;
end;

CREATE OR REPLACE FUNCTION "VPD"."FUN_MOTORCADE" (

p_schema in varchar2, p_table in varchar2

)

return varchar2

l_retstr varchar2(100);

eid number(5, 0);

did number(5, 0);

begin

if lower(user)<> 'admin'

then

l_retstr := null;

for user_rec in

(

select eid, did

from dpmanager

where loginname = lower(user)

) loop

eid := user_rec.eid;

did := user_rec.did;

end loop;

l_retstr := 'did = ' || did ;--|| 'eid = ' || eid;

return l_retstr;

else

l_retstr := null;

return l_retstr;

end if;

end;

2. 授予执行策略函数的权限：

grant execute on FUN_MOTORCADE to public;

1	grant execute on FUN_MOTORCADE to public;

3. 向数据库表添加策略：

Begin
Dbms_Rls.Add_Policy(
Object_Schema =>'admin', --数据表(或视图)所在的Schema名称
Object_Name =>'employee', --数据表(或视图)的名称
Policy_Name =>'motorcade_ply', --POLICY的名称，主要用于将来对Policy的管理
Function_Schema =>'vpd', --返回Where子句的函数所在Schema名称
Policy_Function =>'fun_motorcade', --返回Where子句的函数名称
Statement_Types =>'Select,Insert,Update,Delete', --要使用该Policy的DML类型，如'Select,Insert,Update,Delete'
Update_Check =>True, --仅适用于Statement_Type为'Insert,Update'，值为'True'或'False'
Enable =>True --是否启用，值为'True'或'False'
);
end;

Begin

Dbms_Rls.Add_Policy(

Object_Schema =>'admin', --数据表(或视图)所在的Schema名称

Object_Name =>'employee', --数据表(或视图)的名称

Policy_Name =>'motorcade_ply', --POLICY的名称，主要用于将来对Policy的管理

Function_Schema =>'vpd', --返回Where子句的函数所在Schema名称

Policy_Function =>'fun_motorcade', --返回Where子句的函数名称

Statement_Types =>'Select,Insert,Update,Delete', --要使用该Policy的DML类型，如'Select,Insert,Update,Delete'

Update_Check =>True, --仅适用于Statement_Type为'Insert,Update'，值为'True'或'False'

Enable =>True --是否启用，值为'True'或'False'

);

end;

最开始不明白策略函数的作用，花了好几天上网查资料才知道原来函数的返回值便是你想往表上加的隐式约束。
比如，你向EMP表添加了下面的策略函数：

CREATE OR REPLACE FUNCTION "VPD"."TEST" (
 p_schema in varchar2, p_table in varchar2
)
return varchar2
as
 l_retstr varchar2(100);
begin
  if user = ‘admin’
 then
 l_retstr := ‘1 = 1’;
 else
 l_retstr := ‘1 = 2’;
 end if;
 return l_retstr;
end;

CREATE OR REPLACE FUNCTION "VPD"."TEST" (

p_schema in varchar2, p_table in varchar2

)

return varchar2

l_retstr varchar2(100);

begin

if user = ‘admin’

then

l_retstr := ‘1 = 1’;

else

l_retstr := ‘1 = 2’;

end if;

return l_retstr;

end;

现在，如果你以admin身份登录执行 ‘SELECT * FROM EMP’ , 则实际执行的是 ‘SELECT * FROM EMP WHERE 1 = 1’ , 其中 ‘1 = 1’ 这个条件是策略函数的返回值；如果你以其他身份登录执行 ‘SELECT * FROM EMP’ , 则实际执行的是 ‘SELECT * FROM EMP WHERE 1 = 2’ 。

Tag: SQL

Migrating JComments to WordPress

使用Oracle Job实现定时向管理员发送信息

每隔一定时间间隔查询是否有新消息

Oracle VPD策略实现行级安全性