MySQL

This section of the database connection class, he will automatically load SQL anti-injection function, filtering some sensitive SQL query keywords, but also can increase the Judgment Field Show table status of nature and Show table class to get all

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Create and delete indexes The creation of the primer can be done in the CREATE TABLE statement, or you can add indexes to the table separately with the CREATE INDEX or ALTER TABLE. The deletion index can be implemented using ALTER TABLE or DROP

MySQL writes data usually with INSERT statements, such asINSERT into Person VALUES (John, 20), (Dick, 21), (Harry,) ...; Sometimes, however, you need to import data from text or export data to text in order to insert large amounts of data or

Recently encountered such a problem, in the MySQL stored procedure, the cursor operation, you need to perform a conitnue operation. As we all know, there are three kinds of cursor loops in MySQL, loop,repeat,while three loops, the same way. Never

MySQL under INSERT and update triggers can no longer use the update and insert operations, the official explanation is to prevent the death cycle, the solution is directly to new in the field assignment, but also very convenient, but also explains

To enable it, you need to set this in the MySQL configuration options file (MY.CNF): The code is as follows Copy Code [Mysqld]Log-slow-queries This defaults to logging more than 10 seconds of queries to the log

The usual way to set up a self-add field: Add when creating a table: CREATE TABLE table1 (ID int auto_increment PRIMARY key,...) Add after creating a table: ALTER TABLE table1 Add ID int auto_increment primary key self-add field, be sure to set

Method One, The code is as follows Copy Code SELECT table_rows from Information_schema.tables WHERE table_name= ' game ' and Table_schema = DATABASE (); Usage in PHP PHP code example The code is

Length: is a calculation of the lengths of a field a Chinese character is counted three characters, a number or letter is counted as a character The Char_length (str) return value is the length of the string str, and the length of the unit is a

Regexp Example 1. The query field contains data that is not in English The code is as follows Copy Code SELECT *From ' M_user 'WHERE ' Emp_no 'REGEXP ' [^-~] ' =1 Column 2. So I can get all the English-free

Master's is the mark? MySQL, Slave replaced Percona, did not expect to keep up with progress, and Slave and Master gap more and more distant. Document and description of InnoDB efficiency adjustment and correction 　Found by file has a parameter

A simple way to remove duplicate values from MySQL Example: TableID Name1 A2 b3 C4 C5 b The library structure is probably like this, this is just a simple example, the actual situation will be much more complicated. For example, I want to use a

1.MySQL export Local database data to local file SQL code The code is as follows Copy Code Load data infile '/tmp/test.csv 'into table Test_infoFields terminated by ', ' optionally enclosed by ' "' escaped by '" 'Lines

In fact, the MySQL automatic backup of the small script is very simple, the following is the steps of this small script. The code is as follows Copy Code #cd/www#mkdir Mysqlbackup#vi mysqlautobackup.sh This

1.linux under the command to start MySQL: The code is as follows Copy Code Mysqladmin start/ect/init.d/mysql Start (Previous installation path for MySQL) 2.linux Restart MySQL command: The code is

How to view all authorized usersSELECT DISTINCT CONCAT (' User: ', user, ' @ ', host, '; ') as query from Mysql.user;Revoke permissions that have been given to the MySQL user.Revoke is similar to Grant's syntax, just replace the keyword "to" with

An introduction to the optimistic and pessimistic locks in MySQL and how to use them simply. The probability of being asked about the optimistic lock and pessimistic lock interview in MySQL is still relatively large.The pessimistic lock of MySQL:

MySQL database 1067 error code solution, mysql1067 MySQL 5.6 is installed in Windows Professional 7 64-bit, but an error occurs one day with the error code 1067. How can this problem be solved? Follow these steps: 1. log in as a system

Mysql uses one table to update another table. mysql updates another table. Solution 1: Modify 1 column Update student s, city cSet s. city_name = c. nameWhere s. city_code = c. code; Solution 2: Modify multiple columns Update a, B Set a. title =