MySQL

(a) Code#include #include #include #include #include #include #define Max_query_len 1024#define MAX_QUERY_COUNT 2#define PRINT_MYSQL_ERROR (MySQL) fprintf (stderr, "mysql-error:%s\n", Mysql_error (MySQL))typedef struct prop_global{MYSQL *mysql;Char *

In the process of using MySQL data, sometimes we need a field that is not the primary key is not duplicated, this time will use the SQL UNIQUE constraint.Here is a brief excerpt from W3school:Unique constraints uniquely identify each record in a

Demand:1: Install mysql 5.6 Database2 : Build studb Library, and build stuinfo student table, required to build field stu_id  name  age  sex   Class  dizhi 3: Add a new field name ID in the table to the primary key index, and let the ID

Environment: mysql-5.1.61Operating system: cent-os6.3Purpose: Upgrade to MySQL 5.6.19First, Yum is not feasible. Because Yum source is not updated, I have used 163 netease source, but still not. The latest version is still not 5.6. There is no way,

Transaction is the core of the relational database, throughout the source code, first to look at the relevant data structure, uncover the veil:The server layer and the InnoDB engine layer correspond to different data structures, but are related to

/*1. Create a database*/CREATE DATABASEifNot exists test_01;/*2. Querying all Databases*/show databases;/*3. Using the database*/Use test_01;/*4. Create a table*/CREATE TABLEifNot exists Baseuser (Idint, UserName varchar ( -), Userpwd varchar ( -),

1. Modify the Data sheetIt may be that your account is not allowed to log on remotely, only on localhost. This time, as long as the computer on the localhost, log in to MySQL, the "MySQL" Database in the "User" table "Host" item, from "localhost" to

The MySQL password is always forgotten recently. Online learning of four solutions, recorded.Method 1: Use the Set password commandMysql-u Rootmysql> SET PASSWORD for ' root ' @ ' localhost ' = PASSWORD (' Newpass ');Method 2: Use

The MySQL database supports the master-slave replication of the database and therefore has its unique advantages in clustering. Many domestic and foreign large-scale website architecture system, have adopted MySQL master-slave database configuration

First, MySQL gets the string length methodLength: Are the lengths of the calculated fields a Chinese character is counted as three characters, a number or a letter is counted as a characterChar_length: No matter Chinese characters or numbers or

1.1.1. ERROR 1786 (HY000)"Environment description"msyql5.6.14"Error Message"Error encountered when executing CREATE TABLE ... select:DB1 [Test] [23:01:58]> Create Tablelgmnr_bak select * from LGMNR;ERROR 1786 (HY000): CREATE TABLE ... Selectis

Function:1. Intercept string from leftLeft (str, length)Description: Left (truncated field, intercept length)Example: Select Left (content,200) as abstract from my_content_t2, starting from the right to intercept the stringRight (str,

Check the status of the entire library:Select Concat (Truncate (SUM (data_length)/1024/1024,2), ' MB ') as Data_size,Concat (Truncate (SUM (max_data_length)/1024/1024,2), ' MB ') as Max_data_size,Concat (Truncate (SUM (data_free)/1024/1024,2), ' MB '

One,. msi version of the MySQL installation package in the last execution of the time to the third step died, directly unresponsiveThis is because previously installed in the computer MySQL, uninstall the time without the uninstall caused, because

Today I tried to import a 150M data file (. sql) with Heidisql, resulting in an out of memory error. Search on the Internet a lot of cases, have failed to solve the problem. I even suspect that MySQL's default memory settings are too small. Then ran

First, uninstall the old version of MySQL 1 , rpm Uninstall:1> Check the installation package:Rpm-qa | grep MySQL2> Normal Delete:Rpm-e mysql-5.6.16.rpm3> Brute Force Delete. If you are prompted to have other dependent files when you delete with

Several methods of MySQL database for C + + operation are listed.Two ways to operate with MySQL's C API and through MySQL's connector C + + 1.1.3Operation with vs2013 and 64-bit mSQL 5.6.16The database used in the project is named BooktikTable for

# This is an example of a my. cnf file for mysqld_multi.# Usually this file is located in home dir ~ /. My. cnf or/etc/my. cnf## Some important notes follow:##1. COMMON USER## Make sure that the MySQL user, who is stopping the mysqld services, has#

The MySQL database supports the master-slave replication function of the database, so it has its unique advantages in the cluster. Among the many large website architectures at home and abroad, MySQL master-slave database configuration is used to

Before creating an SQL Server 2000 failover cluster, you must Configure Microsoft cluster service (MSC) and use the Cluster Administrator in Microsoft Windows NT4.0 or Windows 2000 to create at least one cluster disk resource. Before running the SQL