Mysql

Mysql_error (PHP3, PHP4) mysql_error---Return error message syntax from a previous MySQL operation: int mysql_error ([int link_identifier]) Description: Returns the error message code from the last MySQL function, and returns 0 (zero) if no error occurs. Errors returned from the MySQL repository can be mysql_error () to get the error message, Note: this ...

1, MySQL exists text and blob: (1), the same in the text or BLOB column storage or retrieval process, there is no case conversion, when not running in strict mode, if you assign a BLOB or text column exceeds the maximum length of the column type value, the value is intercepted to ensure that the appropriate. If the truncated character is not a space, a warning is generated. Using strict SQL mode produces an error, and the value is rejected rather than intercepted and given a warning. Blob and text columns cannot have default values. When a blob is saved or retrieved ...

This is a section using PHP and mysql database tutorials to achieve user registration and login code Oh, the function is relatively simple and practical user registration procedures Oh. At the same time also added when the user login verification code program, this is a lot of safety Oh. * /?> <! doctype html public "- // w3c // dtd xhtml 1.0 transitional // en" "ht ...

This article mainly introduces the practical steps of character (string) in MySQL database. We all know that the character (string) of MySQL database is often used in practice, so you know more about it is still good Hopefully this will bring you some help in this regard. MySQL database character (string) class Do not think that the character type is CHAR CHAR and VARCHAR difference is that CHAR is a fixed length, as long as you define a field is CHAR (10), no matter whether your stored data reached 10 bytes , ...

Oh, the following code is a little messy ah, is what I do in the test, PHP mysql date calculation code [DATEDIFF] is also the day I need to try it. Here's a look at Code function A ($d) {$Date _1=date ("y-m-d"); $Date _2= $d;   $Date _list_a1=explode ("-", $Date _1); $Date _l ...

Today to introduce six more useful MySQL SQL statements, probably many people through PHP to achieve these functions. 　　1. Calculate the number of years you want to figure out how old this person is by birthdays. 　　SELECT Date_format (From_days to_days (now ())-To_days (@dateofbirth)), '%Y ' + 0; 2. Two time difference to obtain two datetime value difference. Suppose dt ...

Windows http://www.aliyun.com/zixun/aggregation/13357.html ">azure currently does not directly provide MySQL database services, but there is a collaboration with CLEARDB to provide MySQL Database services, or use the Windows Azure virtual machine (Windows Server or Linux Server) service to establish your own MySQL service ...

Mysql_list_dbs (PHP3, PHP4) Mysql_list_dbs---Lists the database syntax available on the MySQL server: int Mysql_list_dbs ([int link_identifier]) Description: Mysql_ List_dbs () will return the result metrics containing the available repositories from the current MySQL daemon, using mysql_tablehttp://www.aliy ...

Mysql_errno (PHP3, PHP4) Mysql_errno---Returns the error message code syntax from a previous MySQL operation: int mysql_errno ([int link_identifier]) Description: Returns the error message code from the last MySQL function, and returns 0 (zero) if no error occurs. Errors returned from the MySQL database can be obtained by using Mysql_errno () to obtain the error code, note: ...

The formula for converting timestamps using execl is: Code: = (xxxxxxxxxx + 8 * 3600) / 86400 + 70 * 365 + 19 Explain the timestamp syntax using mysql tutorial statements Example: select from_unixtime (1234567890, '% y-% m -% d% h:% i:% s') Attached: In mysql, a time field storage type is int (11), how to convert into a type of character, such as store as 13270655222, ...

In the mysql tutorial on Chinese sort is a more interesting question, especially for the field is uft-8 or not gbk, gb2312 field type is Chinese sort out there is a problem, let's look at an example. create table `test111cnnet` (& nbsp; ...

1> explain SQL, similar to Oracle explain statement For example: explain select * from nad_aditem; 2> select benchmark (count, sql); Calculate the sql statement to perform count times For example: mysql> select benchmark (1000; Select * FROM AD;); + ---------...

PHP tutorial based on IP to determine the user's city program $servername = ' localhost ';   $dbname = ' 8684 '; Database Tutorial Name $dbusername = ' root '; Database username $dbpassword = ' 123456 '; Database Password $link =mysql tutorial _connect ($servername, $dbusername,...

mysql_create_db (PHP3, PHP4) mysql_create_db---&http://www.aliyun.com/zixun/aggregation/37954.html ">nbsp; Add a MySQL repository syntax: int mysql_create_db (string database name [, int link_ident ...

MySQL Build business database system Yin learned--business database system requirements and analysis--enhance MySQL cluster data security--improve MySQL Cluster service stability--improve MySQL performance--summarize MySQL build business database system

BINARY is not a function, is a type conversion operator, which is used to force the string after it to be a binary string, which can be understood to be case sensitive when the string is compared as follows: mysql> select binary 'ABCD' = 'abcd' COM1, 'ABCD' = 'abcd' COM2; + -------- + ----------- + | COM1 | COM2 | + -------- + - --------- + | & nbs ...

How to List All Databases for a mysql Server mysql_db_name Definition and Usage The mysql_db_name () function assumes that the mysql_list_dbs () function is called from the database name. This function returns the success of the database name, or FALSE failed. Syntax mysql_db_name (list, row, field) list Required. Result pointer specified mysql_list_dbs () function row required ...

Here is a simple PHP database operation procedures, we are talking about php connect mysql database, and then execute the sql query and then we want the records displayed, and finally closed And mysql database connection. * / $ host = 'localhost'; $ user_name = 'root'; $ password = 'admin'; $ conn = mysql_connec ...

Now we take a look at mysql_fetch_field () function, this function is to read mysql table name, field name. Here we take a look at the syntax of it mysql_fetch_field (data, field_offset) mysql_fetch_field () function is The recordset returns the .mysql_query () function and returns either success on an object, or FALSE or fails when he has two parameters ... Data ...

MySQL database has 10 tens of thousands of data, using rand () to extract a random 10 records, resulting in high server CPU consumption until the crash ~ Baidu has consulted some information, and then combined with some of their own experience, the following solutions: $idlist = '; For ($i =1 $i <=20; $i + +) {if ($i ==1) {$idlist =mt_rand (3,25216);} else{$idlist = $idlist.