MySQL

Recent projects have used the ability to build tables in bulk using stored procedures, which are documented: UseDb_test_3;Drop procedure if EXISTS' Createtableswithindex ';Create procedureCreatetableswithindex ()BEGIN DECLARE`@i`int( One);

1. Requirements: Change the nickname in the review form to the last 4 digits of the mobile phone number.UPDATE SET = MID (Issuer_name,4,6WHERE=One and like' 1% ';2. Due to Misoperation (mid (issuer_name,4,6) is the middle 6 bits), data rollback is

In a lot of times, it's better to be neat than to be clear. The plan should be based on the scene to design, not blindly rely on experience, of course, this is also a new experience!Demand is the company's several sets of public system made through

Updating data: Update table name set health name = "changed value" where built = ...Delete data: Delete from table name where ...Index: CREATE index name on table name (key name);Create the attempt: the Create View name (key, key) as SELECT

Some time ago, a rather senior programmer asked me what is called the index, I am very surprised, I think this will not be bucket, because there are thousands of developers (probably mostly using MySQL) have not received the formal training of the

#第1个存储过程, experience "encapsulating SQL"Delimiter $drop procedure if exists p1;$ #删除存储过程CREATE PROCEDURE P1 () #创建存储过程BeginSELECT * from Rooms;end;$Call P1 (); $ #调用存储过程#第2个存储过程, realize "parameters"Delimiter $drop procedure if exists p2;$CREATE

1. Create a new user.//log in to MySQL@>mysql-u root-p@> Password//Create usermysql> INSERT INTO Mysql.user (Host,user,password) VALUES ("localhost", "abc", Password ("1234"));//Refresh System Permissions TableMysql>flush privileges;This creates a

Today, in a situation, write down:Select * from Table where a= and b=xxxorderby8,2 ;Select * from Table where a= and b=xxxorderbyten,2 The two statements are supposed to return completely different results.But in my program, there's a line that's

First, prefaceMysql replication as a read-write separation of the cheap solution, support a master multi-standby way of data storage, the use of binary log shipping, there is a wide range of applications, online related concepts are more, no longer

Mysqldump backup mechanism: Through a given parameter information and system table data, a table to get the data and INSERT statements inserted into the backup file, so because of inconsistent time, will result in inconsistent data, but for a system

For example:There is a Type field in the article table, he stores the article type, there are 1 headlines, 2 recommended, 3 hot, 4 graphics ..... 11,12,13, wait.Now there is an article he is a headline, but also hot, or graphic,The type is stored in

 #ifdef _WIN32#define SNPRINTF _snprintf#endifBOOL Changeremoterootpwd (const char* szhost,const char* Szroot,Const char* Szrootpwd,const char* szdb,Const char* Szuser,const char* szpwd){MySQL MySQL;Mysql_init (&mysql);     if (!mysql_real_connect

MYSQL Bin-log logs are used primarily for data backup and recovery, and its files save all additions and deletions to the database. 1. Open Bin-log log:  2. View Bin-log logafter connecting to a successful databaseto see if the Log_bin is open

automatically generate RownunSELECT (@rowNO: = @rowNo + 1) as Rowno,a.uuidFrom (SELECT * from H_log_proc) A, (select @rowNO: =0) bRandom Fetch RecordsSELECT * FROM (SELECT (@rowNo: [e-mail protected]+1) as RowNo, pwd from Pur_admininfo, (select

Set environment variable path, point to the bin directory under MySQL Modify the My-default.ini under MySQLBasedir=%mysql_home%Datadir=%mysql_home%\data To the MySQL bin directory to executeMysqld--install(Delete Service is MySQL--remove)PS:

Basic MySQL database commandsMysql-uroot-p password // LoginCreat database people; // createDrop DATABASE name // DeleteShow databases // view all databasesUse Database Name // use a database show tables // display all tables in the current

Compile and install MySQL5.5.x in Linux source code Linux: CentOS 6.5 MySQL version: 5.5.20, attached: [Click to download] 1. Install cmake MySQL 5.5 and later versions have been replaced by the cmake tool./configure compilation and configuration

Configuration items I have adjusted to improve mysql PerformanceSkip-external-locking: skips the external lock. To understand this parameter, you must first understand external-locking (external locking is used to lock the MYISAM data table under

10. mysql Import and Export DatabaseImport and Export mysql database commands in linux1. Use the mysqldump command to export the database (Note: If this command is not available, run this command in the mysql installation path ):1. Export data and

Mysql fuzzy query optimization First, create an index for the fields to be searched in the database (mysql index is unfamiliar, please refer to here ). Secondly, use the following function for fuzzy search. If the position is greater than 0, it