c mysql example

Since I have been in school for so many years, I have come to the conclusion that learning from an example is the fastest and most effective, and can cultivate a strong practical ability. this is a good way to learn. Try not to access. For example, when reading a book, you can start with the examples of each chapter to find out what you don't know and what you don't understand is new knowledge, and then lea

; quit---- Delete all unauthorized users.---- Then execute---- C: \ mysql \ bin \ mysqladmin reload---- C: \ mysql \ bin \ mysqladmin-u Root Password your_password---- Your_password is the password of your database administrator and must be kept properly.---- If you want to connect to the database as an administrator every time, edit c: \ My. CNF and add:User = rootPassword = your_passwordTo stop the

Mysql keyword relevance sorting method detailed example analysis bitsCN.com Small projects sometimes need to use keywords to search for relevance sorting. if sphinx appears to be a zombie, use order by of mysql to deal with it.Method 1:Select * from articles where (title LIKE '% keywords %') or (content LIKE '% helloworld % ') order by (case when title LIKE '% ke

Php + mysql paging query code (mysql paging example) /* * Php paging query code * */ $ Perpagenum = 10; // defines the number of entries displayed on each page. $ Total = mysql_fetch_array (mysql_query ("select count (*) from a"); // query the total number of data records in the database $ Total = $ t

`capacity_pm` FOR EACH ROW beginset new.cpu_core_total=new.host_total * new.templete_cpu_core;set new.cpu_core_used=new.host_used * new.templete_cpu_core;set new.cpu_core_free=new.cpu_core_total - new.cpu_core_used;set new.cpu_core_util=new.cpu_core_used / new.cpu_core_total;end;CREATE TRIGGER `pm_before_update_trigger` BEFORE UPDATE ON `capacity_pm` FOR EACH ROW beginset new.cpu_core_total=new.host_total * old.templete_cpu_core;set new.cpu_core_used=new.host_used * old.templete_cpu_core;set ne

Mysql stored procedure sample code bitsCN.com Drop procedure if exists P_SEQUENCE; /** temporarily omitting the package @ auto liangrui 2014/6/27 T_PRO_PRODUCT table sorting: sort the entire table by sequence number. sort the sequence number by sequence number from the creation date of the repeat sequence number. in the test phase, set @ merid is called. = 'test66 '; call P_SEQUENCE (@ merid); **/create procedure P_PRODUCT_SEQUENCE (in v_merchar_id VA

Sample mysql stored procedure code Drop procedure if existsP_SEQUENCE; /** temporarily omitting the package @ auto liangrui 2014/6/27 T_PRO_PRODUCT table sorting: sort the entire table by sequence number. sort the sequence number by sequence number from the creation date of the repeat sequence number. in the test phase, set @ merid is called. = 'test66 '; call P_SEQUENCE (@ merid); **/create procedure P_PRODUCT_SEQUENCE (in v_merchar_id VARCHAR (100)

A simple example of mysql's MERGE storage engine: bitsCN.com A simple example of mysql's MERGE storage engine Role: you can merge multiple tables with the same structure into one table. Supported versions: mysql5.1 Example: Assume that there are several tables with the same structure: article_0, article_1, article_2, article_3, -- Table "article_0" DDLCREA

Mysql implements the local keyvalue database cache example bitsCN.com There are many Key-Value caches, most of which are memcache and redis. they all run in the form of independent services. at work, sometimes a local key-value cache needs to be embedded, of course there are already LevelDb and so on, but it still feels too heavyweight. This article implements a super lightweight cache, 1. only 400 lines of

Mysql stored procedure example Stored Procedure File name: award_inviter, output parameter: OUT msg varchar (5) BEGINDECLARE v_inviter_userid bigint;/** define related variable values **/DECLARE v_inviter_inviterid bigint;DECLARE v_inviter_user_name varchar (20 );DECLARE v_inviter_inviter_name varchar (20 );DECLARE v_account_total_user double default 0;DECLARE v_account_usemoney_user double default 0;DECLA

; Id: Name } while ($contents = Mysql_fetch_array ($rs));//do....while $per = $page -1;//Previous page $next = $page + 1;//Next echo " Total ". $Total." Records, per page ". $perpagenum." Bar, Total ". $Totalpage." Page "; if ($page! = 1) { echo "Home"; echo "Prev"; } if

This section describes the MySQL User-defined function CREATEFUNCTION. The following is the sample code. For more information, see Mysql> delimiter $ mysql> create function myFunction-> (in_string VARCHAR (255),-> in_find_str VARCHAR (20),-> in_repl_str VARCHAR (20 )) -> returns varchar (255)-> BEGIN-> DECLARE l_new_string VARCHAR (255);-> DECLARE l_find_pos INT

exists] TBNAME (col_name col_definition ,...) EXAMPLE: mysql>CREATE TABLE students(Id INT PRIMARY KEY NOT NULL AUTO_INCREMENT UNSIGNED,Name CHAR(20) UNIQUE KEY NOT NULL,Age TINYINT UNSIGNED INDEX,Gender CHAR(1) NOT NULL) [ENGINE={MyISAM | InnoDB }]; You can also write it like this (the difference is that the primary key, unique key, and index are defined separately ):

Code: /* Simple C program that connects to MySQL Database Server */ # Include # Include Main (){ Char * Begin = " \ N + -------------- begin --------------- + \ n " ; Printf (BEGIN );MySQL * Conn; mysql_res *Res; mysql_row row; Char * Server = " Localhost " ; Char * User = " Your MySQL user " ; Char * Password = "Your password" ; Char * Databa

A problem occurred while executing the index.php file, the database is already established.Error message: Warning:mysqli::mysqli () [Mysqli.mysqli]: (hy000/2003): Can ' t connect to MySQL server on ' localhost ' (10061) in D:\apmxe\ Htdocs\28\db_fns.php on line 5 Warning:mysqli::query () [Mysqli.query]: couldn ' t fetch mysqli in D:\apmxe\htdocs\28\index.php on line 8 Fatal Error:call to a member function Fetch_assoc () on a non-object in D:\apmxe\htd

The group_concat function of mysql uses the group_concat function in MySQL. The Complete syntax is as follows: Group_concat ([DISTINCT] field to be connected [Order by asc/DESC sorting field] [Separator 'delimiter']) Basic query Select * from aa; + ------ +| Id | name |+ ------ +| 1 | 10 || 1 | 20 || 1 | 20 || 2 | 20 || 3 | 200 || 3 | 500 |+ ------ +6 rows in set (0.00 sec) Group by id and print

This section describes how to use a cursor nested in a Mysql stored procedure loop. the detailed implementation is as follows. do not miss it if you need it. BEGIN -- DECLARE the variable DECLARE v_addtime_begin varchar (13); DECLARE v_addtime_end varchar (13); DECLARE v_borrow_id int; DECLARE v_count int; DECLARE s1 int;/** DECLARE the cursor, AND save the query results to the CURSOR **/DECLARE c_borrow cursor for select id from rocky_borrow where bo

many databases. How can we use the one we need. See the following:Use db_name;Use is a fixed keyword, and db_name is the name of the database you want to use, so that we can change db_name to the database in use. That is to say, after you use the above command to select a database, any subsequent database operations will be targeted at the database you selected. For example:Use test04;Delete databaseWe have learned how to create, view, and select databases. If we do not need this database, what

/unix Mysql-max binary distribution and use the table types in the development environment.If the MySQL installation supports InnoDB tables, simply add a TYPE=INNODB definition table creation statement. For example, the following code creates a InnoDB table tcount_tbl: The code is as follows Copy Code root@host#

#/Usr/libexec/mysqld -- innodb-log-file-size = 5242880 -- innodb-force-recovery = 6------------------------------------------------------------------------------InnoDB: Initializing buffer pool, size = 8.0 MInnoDB: Completed initialization of buffer poolInnoDB: The user has set SRV_FORCE_NO_LOG_REDO onInnoDB: Skipping log redoInnoDB: Started; log sequence number 0 0InnoDB :!!! Innodb_force_recovery is set to 6 !!![Note] Event schedents: Loaded 0 events[Note]/usr/libexec/mysqld: ready for connec