MySQL

First, put the MySql.Data.dll in the bin directory. Second, this is the aspx.cs of all the source code, modify the parameters to run directly! UsingMySql.Data.MySqlClient;

1. Start from database structure 1. The definition of a field type follows the following rules: 1. Select the minimum length of the field 2. Use fixed length 3 as much as possible to define "not NULL" 4. Avoid using "Zerofill" in numeric fields

The difference and usage of MySQL and mysqli MySQL is a non-holding relay function and MYSQLI is a permanent connection function. Other words MySQL each link will open a connected process and mysqli run mysqli multiple times will use the same

The last time we introduced the MySQL 5.1 master configuration tutorial, this time we come to achieve the MySQL 5.5 Master-slave replication, in fact, the overall configuration is almost the same, only a few subtle differences.    System: CentOS

Insert record of Mysql statement Instert Single line insert The code is as follows Copy Code Insert into table name (field name, field name, ...) VALUES (field value, field value,...);Insert into A (a_e,a_f,a_a) values (

Delete null data The code is as follows Copy Code Delete from table name where field name = ' or delete from table name where field name =null Remove Space data Also contains spaces in the middle of the string,

MySQL Delete field duplicate data, after the search has just begun to do: Delete from V_togowhere Tel in (select Tel. V_togo GROUP BY Tel has count (tel) > 1)and Togoid not in (select min (togoid) from V_togo GROUP BY Tel has count (tel) >1)

Let's look at the timing backup method in Windows Method a mysqldump Backup database Create a new file, such as Mysqldump.bat.Write the following code to the file Mysqldump.bat The code is as follows Copy Code @echo

How do I return an ID number that inserts a data from the ID of the data? PHP function mysql_insert_id () is the value of the field defined by Auto_increment after the last time an insert query was executed. Sample code The code is as

The MySQL database table's self-added primary key ID number is messed up and needs to be rearranged. Principle: Remove the original ID and re-establish the new self ID. 1, delete the original primary key: The code is as follows

#vi/etc/my.cnf Open MY.CNF Modify Encoding Vi/etc/my.cnf Add under [mysqld] The code is as follows Copy Code Default-character-set=utf8or DEFAULT-CHARACTER-SET=GBK.Add under [client]Default-character-set=utf8or

This article describes how to check the MySQL database, view the current date, using the MySQL current_date variable. We can execute SQL statements when we log on to MySQL using the MySQL client tool or other graphical tools. If we want to look at

If you forget the root password can be modified by the following method Note--skip-grant-tables can turn off permission validation 1. Modify the MySQL configuration file under [mysqld] Add a line of configuration--skip-grant-tables, restart MySQL

The company's database storage engine was all MyISAM, data volume and access is not very large, so there is no problem. However, the recent occurrence of the MySQL data table is often locked, directly caused the user to connect the site timeout and

Like my side. query Jz_user table user creation time is greater than April 1 to April 30 for example The code is as follows Copy Code Select From_unixtime (create_time), user_id from Jz_user Where date_format

Today, when MySQL was optimized, the following error occurred after restarting MySQL:

Linux cannot restart solution after MySQL reload Before the installation of the mysql5.1, but after the System Restore service did not, simply upgraded to 5.5, but the installation is good, the last step of configuration is not start! View log:

When it comes to MySQL's execution, it has to say its execution process. And its execution process is divided into standard execution process and optimized execution process. Standard processStandard processes are standard processes for SQL

Method One: My common practice is to add a Delete identity field to the database.such as: isdel=1 so that the code deleted the field Method Two: Direct restriction of MySQL DELETE statement deletion Add parameter-u when starting MySQL

Recently, I want to develop an information management system for the company from the development machine (Windows NT IIS4.0 Access) migrating to a real Linux server (Apache1.3.12 PHP 4.03 MySQL 3.23.26), the migration of content from dozens of