There are a lot of friends who have installed MySQL but don't know how to use it. In this article, we will learn some common MySQL commands from connecting MySQL, changing passwords, and adding users.
First, connect MySQL.
Format:
Mysql-h Host Address
-U user Name
-P User Password
1. Example 1: Connect to MySQL on this machine.
First open the DOS window, and then enter the directory Mysqlbin, and then type the command mysql-uroot-p, enter after the prompt you to lose the password, if just installed MySQL, superuser root is no password, so directly enter into MySQL, The prompt for MySQL is://from www.w3sky.com
Mysql>
2. Example 2: Connect to MySQL on the remote host. Assume the remote host IP is: 110.110.110.110, the user name is root, the password is abcd123. Type the following command:
Mysql-h110.110.110.110-uroot-pabcd123
(Note: You and root can be used without spaces, others are the same)
3. Quit MySQL command://from www.w3sky.com
Exit (Enter)
Second, change the password.
Format: Mysqladmin-u username-P Old password password new password
1, Example 1: Add a password to root ab12. First enter directory Mysqlbin under DOS, and then type the following command
Mysqladmin-uroot-password AB12
Note: Because Root does not have a password at the beginning, the-p old password can be omitted.
2, Example 2: Then change the root password to djg345.
MYSQLADMIN-UROOT-PAB12 Password djg345
Third, add new users. (Note: Unlike the above, the following is because it is a command in a MySQL environment, so it is followed by a semicolon as a command terminator)
Format:
Grant SELECT on database. * To User name @ login host identified by "password"
Example 1, add a user test1 password for ABC, so that he can log on any host, and all databases have query, insert, modify, delete permissions. First, use the root user to connect to MySQL, and then type the following command:
Grant Select,insert,update,delete on *. * to test1@ "%" identified by "ABC";
But example 1 increases the user is very dangerous, you want to like someone to know test1 password, then he can be on any computer on the Internet to log into your MySQL database and your data can do whatever you like, the workaround is shown in Example 2.
Example 2, add a user test2 password for ABC, so that he can only login on localhost, and the database mydb can query, insert, modify, delete operations (localhost refers to the local host, that is, the MySQL database host), This allows the user to use a password that knows test2, and he cannot access the database directly from the Internet, but only through a Web page on the MySQL host.
Grant Select,insert,update,delete on mydb.* to Test2@localhost identified by "ABC";
If you do not want to test2 have a password, you can call another command to erase the password.
Grant Select,insert,update,delete on mydb.* to Test2@localhost identified by "";
In the previous article we talked about login, add user, password change and other issues. In the next section, we'll look at MySQL's operations on the database. Note: You must first log in to MySQL, the following actions are performed at the prompt of MySQL, and each command ends with a semicolon.
First, the Operation skill
1, if you hit the command, enter after the discovery forgot to add a semicolon, you do not have to re-play the command, as long as a semicolon to enter the return on it. In other words, you can break a complete command into a few lines, and then use a semicolon to make the end sign OK.
2. You can use the cursor up and down keys to recall the previous command. But previously I used an old version of MySQL that was not supported. What I'm using now is:
Mysql-3.23.27-beta-win.
Second, show the command
1. Display the list of databases.
show databases;
Just started with two databases: MySQL and test. MySQL Library is very important it has the MySQL system information, we change the password and the new user, is actually using this library to operate.
2. Display the table in the library:
use MySQL;//Open the library, learn foxbase must not be strange//from www.w3sky.com
Show tables;
3, display the structure of the table:
describe table name;
4, build the library:
Create database name;
5, build the table:
Use library name;
CREATE TABLE table name (field settings list);
6. Deleting the library and deleting the table:
drop database name;
drop table name;
7. Empty the records in the table:
Delete from table name;
8. Display the records in the table:
SELECT * from table name;
A city build and build tables and instances of inserting data
Drop database if exists school; Delete from www.w3sky.com if school is present
Create Database School; Building a library School
Use school; Open Library School
CREATE TABLE teacher//Create tables Teacher
(
ID int (3) auto_increment NOT null primary key,
Name Char (TEN) is not NULL,
Address varchar (+) default Shenzhen,
Year Date
); End of Build table
The following is the Insert field
Insert INTO teacher valuess (, Glchengang, Shenzhen One, 1976-10-10);
Insert INTO teacher valuess (, Jack, Shenzhen, 1975-12-23);
Note: In the Build table (1), set the ID to a number field of length 3: Int (3) and let it automatically add one to each record: Auto_increment is not null, and makes him the main field primary Key (2) sets the name to a character field of length 10 (3) To set address to a character field of length 50, and the default value is Shenzhen. What is the difference between varchar and char, only to wait for a later article to say. (4) Set year as the Date field.
It is also possible to type the above commands at the MySQL prompt, but it is not easy to debug. You can write the above command as-is to a text file, assume School.sql, then copy it to C:, and enter directory Mysqlbin in DOS, and then type the following command:
Mysql-uroot-p Password < C:school.sql
If successful, empty a row without any display, and if there is an error, there is a hint. (The above command has been debugged, you can use it only if you remove//comment).
Iv. Transfer of textual information to the database
1, the text data should conform to the format: The field data is separated by the TAB key, the null value is substituted by N.
Cases:
3 Rose Shenzhen II 1976-10-10
4 Mike Shenzhen one 1975-12-23
2, the data incoming command, load data local infile "file name" into table table name;
Note: You might want to copy the file to the Mysqlbin directory, and use the using command to hit the library that contains the table.
V. BACKUP DATABASE: (command executed in DOS Mysqlbin directory)
Mysqldump--opt SCHOOL>SCHOOL.BBB
Note: Back up the database school to the school.bbb file, school.bbb is a text file, the filename is taken, open to see what you will find.
PostScript: In fact, MySQL database operation and other SQL class database is much the same, you'd better find a book to read SQL. I am here only to introduce some basic, in fact, I only understand these, hehe. The best MySQL tutorial or "Yanzi" translated "MySQL Chinese reference manual" not only free every relevant website has downloaded, and it is the most authoritative. Unfortunately not like the "PHP4 Chinese Manual" is the CHM format, in the search function command is not very convenient
The above describes the MySQL database MySQL database beginners User Guide, including the MySQL database content, I hope that the PHP tutorial interested in a friend to help.
