MySQL

Environment: Mysql,spring mvc3.2.0,jquery v2.0.3, using JdbcTemplate to access the database, is equivalent to a full Spring solution.PhenomenonUsing the form post directly, or using the jquery post data to the server, the Chinese strings obtained in

I found a lot on the Internet.1. may be/usr/local/mysql/data/rekfan.pid file does not have permission to writeWORKAROUND: Give permission to execute "chown -R mysql:mysql /var/Data" "Chmod-r 755/usr/local/mysql/data" Then restart mysqld! 2. The

Pre-Preparation:1, CREATE TABLE person # Assume that this table is used to collect the basic information of the Earth people.(ID bigint,Name varchar (16),Country varchar (16));2. Create VIEW Chinise # This view is for querying so there are basic

Planning:Primary server: 192.168.1.254From server: 192.168.1.215System environment:Operating system centos6.4_x64MySQL mysql-server-5.1.73-3.el6_5.x86_64First, configure the main service side    1. Editing Profiles         vim /etc/my.cnf 

Slave delay is more common, if the short delay after the catch up, generally can accept. Using InnoDB is not a bad thing, it will reduce some slave abort situation. If it is a MyISAM table, the Insert update delete operation is interrupted

First say the problem encountered: There is a MySQL instance ran two libraries, two sets of programs. One of the library's table names is all uppercase, and the other library's table names are all lowercase.The program with the table named lowercase

Pre-Preparation:By default, MySQL does not have logs, add logs and log files, and we can configure it ourselves.configuration file is My.ini;MYSQLD node;The configuration item is log-bin;To specify a path and name for the file. if:

One: Check the installation path: 1, nginx installation path : Ps-ef | grep nginxPress ENTER to appear as a slice:650) this.width=650; "src=" Http://hi.csdn.net/attachment/201107/6/0_13099311747NbI.gif "style=" border:none; "/>After the master

Select A.receiveid, (A.num-ifnull (b.num,0)) as Num from (SELECT Num,receiveid from Dog_giftnumrecord where Giftid = 1) as A LEFT join (SELECT Num,receiveid from Dog_giftnumrecord where Giftid = 2) as B on a.receiveid = B.receiveid　　Structure of the-

1. The index column of the search is not necessarily the column you want to select. In other words, the column that best fits the index is the column that appears in the WHERE clause, or the column specified in the JOIN clause, rather than the

1. Use case when method (not recommended)- The code is as follows Copy Code SELECTCOUNT (DISTINCT user_id) User_count,CaseWhen create_time>1395046800 and create_timeWhen create_time>1395050400 and create_timeWhen

MySQL Query results row field stitching, can be implemented with the following two functions:1. Concat functionMysql> Select Concat (' 1 ', ' 2 ', ' 3 ') from test; +---------------------+| Concat (' 1 ', ' 2 ', ' 3 ') |+---------------------+| 123 |

MySQL Bulk replace specified field string statement UPDATE data table name SET Field name = replace (field name, ' String to replace ', ' replace with ') WHERE to set conditions; If the WordPress article "Search engine

It took more than 1 days to pack hive, and finally it was ready. The installation steps are documented below.One: Before installing hive, you need to install Hadoop and MySQL. It's not in here.II: Download hive0.9.0

Mysql multi-log table result set splicing Stored Procedure Generally, a single-day log only records the log information of the current day. If you need to view the log information within January, You Need To splice the result set of the daily log

Connect c under mysql to mysql database 1. install sudo yum install mysql-devel to install components and libraries 2. #include #include #include #include int main(int argc, const char *argv[]){ MYSQL mysql; MYSQL_RES *result; MYSQL_ROW row;

Mysql Table is read only error solution, mysqltable Today, I copied the database data to linux and run the program "Table is read only in mysql" to query the information. Run the following command in linux: # Mysqladmin-u root-p flush-tables There

Summary of common mysql commands# Modifying Field TypesAlter table 'table _ name' modify column ip varchar (50 );# Adding fieldsAlter table 'table _ name' add ip varchar (50 );# Add a primary key (primary key index)Alter table 'table _ name' add

PHP + Mysql ---- data paging display technology Generally, when a page loads a large amount of data, the data cannot be displayed at the same time. At this time, the more common method is the scroll bar and paging. All the children who have read

Mysql inserting garbled characters Cause: The character encoding of the database table and the insert statement does not match or the database table encoding does not support Chinese characters. Solution: Modify the character encoding in table