MySQL Developer, meet “Quan” (aka the MySQL Query Analyzer)
The MySQL Query Analyzer ("Quan") is designed to save development time on query coding and tuning by expanding on all of the good things found in the Slow Query Log, SHOW PROCESSLIST; EXPLAIN plan, and 5.1 profiler all with no dependence of any of these atomic things. To this end, we integrated Quan into the Enterprise Monitor so developers can monitor security, performance, availability AND all of their queries across all their MySQL servers from a single, consolidated view.
Hi All,
i have a table in mysql with the following data
Table name Test
Assettype Serial_No Status location
Mouse 123456 In Stock chennai
Mouse 98765 Allocated chennai
Keyboard ... (2 Replies)
Hello
i have created mysql query to compare to values and get difference in percentage
as following:
SELECT file_name, 100 - ((100 * (SELECT file_count FROM xipi_files z WHERE x.file_group = z.file_group AND x.file_name = z.file_name AND z.insert_date = CURDATE( ) - INTERVAL 1 DAY)) /... (1 Reply)
Hi,
I want to access mysql query from database , for that i have tried the below code
#! /bin/bash
TABLE_NAME=database1
USER_NAME=root
IP_ADDR=111.20.9.256
somevar=`echo "select altid from alert where altid='2724'"| mysql -h $IP_ADDR -u $USER_NAME $TABLE_NAME `
echo $somevar
... (1 Reply)
hello all
i have 2 columns every column in the following format
column1
2011-04-01 11:39:54
column2
2019-02-03 00:00:00
i want get difference between above data as following
2 days 11:39
how to do so ?
i tried many functions but nothing works
please advice what is the query... (6 Replies)
I am debugging some code and came across ? in the WHERE cause in a mysql query.
Is this possible and what situations would this be used?
SELECT ip, count
FROM table
WHERE domain=?
thanks & regards (2 Replies)
Hi there,
I have a hierarchical database that include 4 tables. Table A is the parent of B, B is Parent of C, C is parent of D. If I want to query everything in D that is associated with A.name, how do I do that? Thanks!
YanYan (0 Replies)
MYSQL_REAL_ESCAPE_STRING(3) 1 MYSQL_REAL_ESCAPE_STRING(3)mysql_real_escape_string - Escapes special characters in a string for use in an SQL statementSYNOPSIS
Warning
This extension is deprecated as of PHP 5.5.0, and will be removed in the future. Instead, the MySQLi or PDO_MySQL extension should
be used. See also MySQL: choosing an API guide and related FAQ for more information. Alternatives to this function include:
omysqli_real_escape_string(3)
o PDO::quote
string mysql_real_escape_string (string $unescaped_string, [resource $link_identifier = NULL])
DESCRIPTION
Escapes special characters in the $unescaped_string, taking into account the current character set of the connection so that it is safe to
place it in a mysql_query(3). If binary data is to be inserted, this function must be used.
mysql_real_escape_string(3) calls MySQL's library function mysql_real_escape_string, which prepends backslashes to the following charac-
ters: x00,
,
, , ', " and x1a.
This function must always (with few exceptions) be used to make data safe before sending a query to MySQL.
Caution
Security: the default character set
The character set must be set either at the server level, or with the API function mysql_set_charset(3) for it to affect
mysql_real_escape_string(3). See the concepts section on character sets for more information.
o $unescaped_string
- The string that is to be escaped.
o $
link_identifier -The MySQL connection. If the link identifier is not specified, the last link opened by mysql_connect(3) is
assumed. If no such link is found, it will try to create one as if mysql_connect(3) was called with no arguments. If no connection
is found or established, an E_WARNING level error is generated.
Returns the escaped string, or FALSE on error.
Example #1
Simple mysql_real_escape_string(3) example
<?php
// Connect
$link = mysql_connect('mysql_host', 'mysql_user', 'mysql_password')
OR die(mysql_error());
// Query
$query = sprintf("SELECT * FROM users WHERE user='%s' AND password='%s'",
mysql_real_escape_string($user),
mysql_real_escape_string($password));
?>
Example #2
An example SQL Injection Attack
<?php
// We didn't check $_POST['password'], it could be anything the user wanted! For example:
$_POST['username'] = 'aidan';
$_POST['password'] = "' OR ''='";
// Query database to check if there are any matching users
$query = "SELECT * FROM users WHERE user='{$_POST['username']}' AND password='{$_POST['password']}'";
mysql_query($query);
// This means the query sent to MySQL would be:
echo $query;
?>
The query sent to MySQL:
SELECT * FROM users WHERE user='aidan' AND password='' OR ''=''
This would allow anyone to log in without a valid password.
Note
A MySQL connection is required before using mysql_real_escape_string(3) otherwise an error of level E_WARNING is generated, and
FALSE is returned. If $link_identifier isn't defined, the last MySQL connection is used.
Note
If magic_quotes_gpc is enabled, first apply stripslashes(3) to the data. Using this function on data which has already been escaped
will escape the data twice.
Note
If this function is not used to escape data, the query is vulnerable to SQL Injection Attacks.
Note
mysql_real_escape_string(3) does not escape % and _. These are wildcards in MySQL if combined with LIKE, GRANT, or REVOKE.
mysql_set_charset(3), mysql_client_encoding(3), addslashes(3), stripslashes(3), The magic_quotes_gpc directive, The magic_quotes_runtime
directive.
PHP Documentation Group MYSQL_REAL_ESCAPE_STRING(3)
