Because I am study ASP first, therefore makes PHP again time will discover that many places need to adapt.

1st, the attention do not leak the semicolon
2nd, before the attention do not leak the variable $
3rd, uses SESSION time pays attention do not omit session_start();

If occurs is wrong, may use the following methods:
1st, if is the SQL sentence makes a mistake, then has output the SQL sentence on the annotation, the attention also wants the annotation to adjust the following execution SQL sentence
2nd, if is the variable for spatial, mostly has not transmitted the arriving, the output variable inspects, inspects the form id and name
3rd, if is the database connection makes a mistake, inspects whether to open MY SQL correctly and whether to omit the connection sentence
4th, the attention shrinks, removes the mistake which the parenthesis area does not match

In makes the big website time, my mentality constructs the database first, determines each field the function, with table between relations. Then the design backstage contact surface, starts from the increase data to start, because increases whether to succeed may confirm directly to the database inside, completed the increase to make the demonstration again the page, finally was both’s union. Generally speaking the backstage includes the increase deletion to revise and to demonstrate that the backstage did not have the question, the onstage also did not have what major problem. The onstage also needs to pay attention to the security and fault-tolerant also has is the output format.

Good,  tomorrow will say, if will upload the document with PHP and sends the mail.

The key was uses in SQL sentence limit to define the demonstration the record from several to several. We need a record current page variable $page, but also needs altogether record to count $num

Regarding $page, if does not have us to let its =0, if has <0 to let its also =0, if surpassed the total number of pages to let he = total number of pages.

$execc= ” select count(*) from tablename “;
$resultc=mysql_query($execc);
$rsc=mysql_fetch_array($resultc);
$num=$rsc[0];

This may obtain the record total
ceil($num/10)), if page of 10 record, this is the total number of pages

Therefore may such write
if (empty ($_GET [’page’]))
{
$page=0;
}
else
{
$page=$_GET [’page’];
if($page<0)$page=0;
if($page>=ceil($num/10))$page=ceil($num/10)-1; // because page is from 0 starts, therefore wants - 1
}

Such $exec may such write $exec= ” select * from tablename limit “. ($page*10).”, 10 “;
a // page is 10 records

Finally we need to do are several connections:
<a href= ” xxx.php? page=0 ” >FirstPage</a>
<a href= ” xxx.php? page=<? = ($page-1)? > ” >PrevPage</a>
<a href= ” xxx.php? page=<? = ($page+1)? > ” >NextPage</a>
<a href= ” xxx.php? page=<? =ceil($num/10)-1? > ” >LastPage</a>

SESSION many of the role, with most of the site is within the pages of variable transmission. We must start the page session_start (); Open SESSION;
Then you can use SESSION variables, for example, is assigned to: $ _ SESSION [ ‘item’] = “item1″; need to get value is $ item1 = $ _SESSION [ ‘item’];, it is very simple. Here, we may use some function, for instance, judgement is not a SESSION variable is empty, so to write: empty ($ _SESSION [ ‘inum’]) to return to true or false.

Below the front comprehensive look at what we have a landing procedures, judge the user password is correct.
This form is landing: login.php
<table width=”100%” height=”100%” border=”0″ align=”center” cellpadding=”0″ cellspacing=”0″>
<tr>
<form action=”checklogin.php” method=”post”> <td align=”center” valign=”middle”> <table width = “400″ border = “0″ cellpadding = “5″ cellspacing = “1″ class = “tablebg”>
<tr class=”tdbg”>
<td colspan=”2″> <div align=”center”> Administrators Login </ div> </ td>
</ tr>
<tr class=”tdbg”>
<td> <div align=”center”> Username </ div> </ td>
<td> <div align=”center”>
<input name=”username” type=”text” id=”username”>
</ div> </ td>
</ tr>
<tr class=”tdbg”>
<td> <div align=”center”> Password </ div> </ td>
<td> <div align=”center”>
<input name=”password” type=”password” id=”password”>
</ div> </ td>
</ tr>
<tr class=”tdbg”>
<td colspan=”2″> <div align=”center”>
<input type=”submit” name=”Submit” value=”Submit”>
<input type=”reset” name=”Submit2″ value=”Clear”>
</ div> </ td>
</ tr>
</ table> </ td> </ form>
</ tr>
</ table>

This is the processing of documents
< »
require_once ( ‘conn.php’);
session_start ();
$ username = $ _POST [ ‘username’];
$ password = $ _POST [ ‘password’];
$ exec = “select * from admin where username =’”.$ username .”‘”;
if ($ result = mysql_query ($ exec))
(
if ($ rs = mysql_fetch_object ($ result))
(
if ($ rs-> password == $ password)
(
$ _SESSION [ ‘Adminname’] = $ username;
header ( “location: index.php”);
)
else
(
echo “<script> alert ( ‘Password Check Error!’); location.href = ‘login.php’; </ script>”;
)
)
else
(
echo “<script> alert ( ‘Username Check Error!’); location.href = ‘login.php’; </ script>”;
)
)
else
(
echo “<script> alert ( ‘Database Connection Error!’); location.href = ‘login.php’; </ script>”;
)
«>

conn.php is this:
< »
$ conn = mysql_connect ( “127.0.0.1″, “”, “”);
mysql_select_db ( “shop”);
«>

Because $ _ SESSION [ ‘adminname’] = $ username; written like this we can verify whether the documents landed statement: checkadmin.asp
< »
session_start ();
if ($ _SESSION [ ‘adminname’]==”)
(
echo “<script> alert ( ‘Please Login First’); location.href = ‘login.php’; </ script>”;
)
?>

Learning Objective: To learn to add amended to delete data
mysql_query ($ exec);
This statement alone can perform all the operations, is different this $ exec sql statement
Add: $ exec = “insert into tablename (item1, item2) values (’”.$_ POST [ ‘item1′].”‘,”.$_ POST [’ item1′].”)”;
Delete: $ exec = “delete from tablename where …”;
Laws: $ exec = “update tablename set item1 =’”.$_ POST [ ‘item1′].”‘ where …”;
Having said that we should talk about the form and php variable transmission, if the form of a <input name = “item1″ type = “text” id = “item1″>
POST to submit the form, then the document can be dealt with the form used $ _ POST [ ‘item1′] are variable values, the same is submitted to GET $ _ GET [ ‘item1′]
Is not very simple » But usually $ exec a problem, because the SQL statement you may be very long, you will be missed. Connectors, or ‘to field surrounded character.
We can note mysql_query ($ exec); statement to echo $ exec; replace the output to $ exec to check the accuracy. If you are not able to detect $ exec what is wrong, they can copy this sql statement to phpmyadmin in the implementation to see if it’s an error message. Still needs attention is that we do not use some sensitive field as a string of names, or is likely to have problems, for instance, what the date. The naming of variables, fields that followed the naming of some of their time is a good, beginners can not ignore its importance.

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  ]]> http://www.pagecity.org/news/learn-php-and-mysql-programingstep-by-step610pagecityorg_15/feed/ http://www.pagecity.org/news/learn-php-and-mysql-programingstep-by-step510pagecityorg_14/ http://www.pagecity.org/news/learn-php-and-mysql-programingstep-by-step510pagecityorg_14/#comments Sun, 27 Apr 2008 20:47:32 +0000 admin http://www.pagecity.org/news/learn-php-and-mysql-programingstep-by-step510pagecityorg_14/ Learning Objective: To learn to read data
Look at the two functions:
1, mysql_query
Submit a query string. Grammar: int mysql_query (string query, int [link_identifier]); return value: integer
This function submit query string for MySQL related to the handling or implementation. If not specified link_identifier parameters, the program will automatically find the nearest open ID. When the query is a query string UPDATE, INSERT and DELETE, is likely to return to the true or false; SELECT query string is then returned to the new ID value, when returns false, is not without the return of the successful implementation of value, but for A string of errors.
2, mysql_fetch_object to return to categories of information. Grammar: object mysql_fetch_object (int result, int [result_typ]); return value: Class
This function will be used to query results result in the demolition to the variable category. If the result do not have the information, then returns false values.
Look at a simple example:
< »
$ exec = “select * from user”;
$ result = mysql_query ($ exec);
while ($ rs = mysql_fetch_object ($ result))
(
echo “username:”. $ rs-> username. “<br>”;
)
«>
Of course, the user in the form of a username field, which in similar asp
<%
exec = “select * from user”
set rs = server.createobject ( “adodb.recordset”)
rs.open exec, conn, 1,1
do while not rs.eof
response.write “username:” & rs ( “username “)&”< br>”
rs.movenext
loop
%>
Of course, have to connect to database, and we typically require_once ( ‘conn.php’); conn.php and said there is a link on the database code.
Two small orders can read data completed the work of the next time that the data added to delete amended.

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String operation:
There is only one operator symbols, English is the full stop. It will link up the string, a merger of the new string. Similar to the ASP &
< »
$ a = “PHP 4″;
$ b = “powerful”;
echo $ a. $ b;
«>
Here also raises two questions, first of all exports in the PHP language is the echo, the second in similar ASP <% = variable%>, PHP can also be < »= variable»>.
Logical:
Symbolic significance
<<
>>
<= Less than or equal to
> = Greater than or equal to
== Equivalent
! Not mean =
& & And (And)
and and (And)
| | Or (Or)
or or (Or)
xor vary or (Xor)
! Not (Not)
Here today, tomorrow, said the process control.

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