Install Mysql on UBUNTU

MySQL Workbench can be easily installed on Ubuntu/Gnome. Just download the binary .deb file from the MySQL web site for workbench (currently named mysql-workbench-oss-5.1.16-1_i386.deb), save it to your home directory. Then run:

sudo apt-get install liblua5.1-0 libzip1
sudo dpkg -i mysql-workbench-oss-5.1.16-1_i386.deb (adapt the name accordingly)

Then, you have MySQL Workbench listed under "Applications > Programming".

MySql Teminal Commands

This is a list of handy MySQL commands that I use time and time again. At the bottom are statements, clauses, and functions you can use in MySQL. Below that are PHP and Perl API functions you can use to interface with MySQL. To use those you will need to build PHP with MySQL functionality.

Below when you see # it means from the unix shell. When you see mysql> it means from a MySQL prompt after logging into MySQL.
To login (from unix shell) use -h only if needed.

# [mysql dir]/bin/mysql -h hostname -u root -p
Create a database on the sql server.

mysql> create database [databasename];
List all databases on the sql server.

mysql> show databases;
Switch to a database.

mysql> use [db name];
To see all the tables in the db.

mysql> show tables;
To see database's field formats.

mysql> describe [table name];
To delete a db.

mysql> drop database [database name];
To delete a table.

mysql> drop table [table name];
Show all data in a table.

mysql> SELECT * FROM [table name];
Returns the columns and column information pertaining to the designated table.

mysql> show columns from [table name];
Show certain selected rows with the value "whatever".

mysql> SELECT * FROM [table name] WHERE [field name] = "whatever";
Show all records containing the name "ihsan" AND the phone number '3444444'.

mysql> SELECT * FROM [table name] WHERE name = "ihsan" AND phone_number = '3444444';
Show all records not containing the name "ihsan" AND the phone number '3444444' order by the phone_number field.

mysql> SELECT * FROM [table name] WHERE name != "ihsan" AND phone_number = '3444444' order by phone_number;
Show all records starting with the letters 'ihsan' AND the phone number '3444444'.

mysql> SELECT * FROM [table name] WHERE name like "ihsan%" AND phone_number = '3444444';
Show all records starting with the letters 'ihsan' AND the phone number '3444444' limit to records 1 through 5.

mysql> SELECT * FROM [table name] WHERE name like "ihsan%" AND phone_number = '3444444' limit 1,5;
Use a regular expression to find records. Use "REGEXP BINARY" to force case-sensitivity. This finds any record beginning with a.

mysql> SELECT * FROM [table name] WHERE rec RLIKE "^a";
Show unique records.

mysql> SELECT DISTINCT [column name] FROM [table name];
Show selected records sorted in an ascending (asc) or descending (desc).

mysql> SELECT [col1],[col2] FROM [table name] ORDER BY [col2] DESC;
Return number of rows.

mysql> SELECT COUNT(*) FROM [table name];
Sum column.

mysql> SELECT SUM(*) FROM [table name];
Join tables on common columns.

mysql> select lookup.illustrationid, lookup.personid,person.birthday from lookup left join person on lookup.personid=person.personid=statement to join birthday in person table with primary illustration id;
Creating a new user. Login as root. Switch to the MySQL db. Make the user. Update privs.

# mysql -u root -p
mysql> use mysql;
mysql> INSERT INTO user (Host,User,Password) VALUES('%','username',PASSWORD('password'));
mysql> flush privileges;
Change a users password from unix shell.

# [mysql dir]/bin/mysqladmin -u username -h hostname.blah.org -p password 'new-password'
Change a users password from MySQL prompt. Login as root. Set the password. Update privs.

# mysql -u root -p
mysql> SET PASSWORD FOR 'user'@'hostname' = PASSWORD('passwordhere');
mysql> flush privileges;
Recover a MySQL root password. Stop the MySQL server process. Start again with no grant tables. Login to MySQL as root. Set new password. Exit MySQL and restart MySQL server.

# /etc/init.d/mysql stop
# mysqld_safe --skip-grant-tables &
# mysql -u root
mysql> use mysql;
mysql> update user set password=PASSWORD("newrootpassword") where User='root';
mysql> flush privileges;
mysql> quit
# /etc/init.d/mysql stop
# /etc/init.d/mysql start
Set a root password if there is on root password.

# mysqladmin -u root password newpassword
Update a root password.

# mysqladmin -u root -p oldpassword newpassword
Allow the user "ihsan" to connect to the server from localhost using the password "passwd". Login as root. Switch to the MySQL db. Give privs. Update privs.

# mysql -u root -p
mysql> use mysql;
mysql> grant usage on *.* to ihsan@localhost identified by 'passwd';
mysql> flush privileges;
Give user privilages for a db. Login as root. Switch to the MySQL db. Grant privs. Update privs.

# mysql -u root -p
mysql> use mysql;
mysql> INSERT INTO user (Host,Db,User,Select_priv,Insert_priv,Update_priv,Delete_priv,Create_priv,Drop_priv) VALUES ('%','databasename','username','Y','Y','Y','Y','Y','N');
mysql> flush privileges;

or

mysql> grant all privileges on databasename.* to username@localhost;
mysql> flush privileges;
To update info already in a table.

mysql> UPDATE [table name] SET Select_priv = 'Y',Insert_priv = 'Y',Update_priv = 'Y' where [field name] = 'user';
Delete a row(s) from a table.

mysql> DELETE from [table name] where [field name] = 'whatever';
Update database permissions/privilages.

mysql> flush privileges;
Delete a column.

mysql> alter table [table name] drop column [column name];
Add a new column to db.

mysql> alter table [table name] add column [new column name] varchar (20);
Change column name.

mysql> alter table [table name] change [old column name] [new column name] varchar (50);
Make a unique column so you get no dupes.

mysql> alter table [table name] add unique ([column name]);
Make a column bigger.

mysql> alter table [table name] modify [column name] VARCHAR(3);
Delete unique from table.

mysql> alter table [table name] drop index [colmn name];
Load a CSV file into a table.

mysql> LOAD DATA INFILE '/tmp/filename.csv' replace INTO TABLE [table name] FIELDS TERMINATED BY ',' LINES TERMINATED BY '\n' (field1,field2,field3);
Dump all databases for backup. Backup file is sql commands to recreate all db's.

# [mysql dir]/bin/mysqldump -u root -ppassword --opt >/tmp/alldatabases.sql
Dump one database for backup.

# [mysql dir]/bin/mysqldump -u username -ppassword --databases databasename >/tmp/databasename.sql
Dump a table from a database.

# [mysql dir]/bin/mysqldump -c -u username -ppassword databasename tablename > /tmp/databasename.tablename.sql
Restore database (or database table) from backup.

# [mysql dir]/bin/mysql -u username -ppassword databasename < /tmp/databasename.sql
Create Table Example 1.

mysql> CREATE TABLE [table name] (firstname VARCHAR(20), middleinitial VARCHAR(3), lastname VARCHAR(35),suffix VARCHAR(3),officeid VARCHAR(10),userid VARCHAR(15),username VARCHAR(8),email VARCHAR(35),phone VARCHAR(25), groups VARCHAR(15),datestamp DATE,timestamp time,pgpemail VARCHAR(255));
Create Table Example 2.

mysql> create table [table name] (personid int(50) not null auto_increment primary key,firstname varchar(35),middlename varchar(50),lastnamevarchar(50) default 'bato');

Change Mysql root password

Step # 1 : Stop mysql service

# /etc/init.d/mysql stop
Output:

Stopping MySQL database server: mysqld.

Step # 2: Start to MySQL server w/o password:

# mysqld_safe --skip-grant-tables &
Output:

[1] 5988
Starting mysqld daemon with databases from /var/lib/mysql
mysqld_safe[6025]: started

Step # 3: Connect to mysql server using mysql client:

# mysql -u root
Output:

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 1 to server version: 4.1.15-Debian_1-log

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

mysql>

Step # 4: Setup new MySQL root user password

mysql> use mysql;
mysql> update user set password=PASSWORD("NEW-ROOT-PASSWORD") where User='root';
mysql> flush privileges;
mysql> quit

Step # 5: Stop MySQL Server:

# /etc/init.d/mysql stop
Output:

Stopping MySQL database server: mysqld
STOPPING server from pid file /var/run/mysqld/mysqld.pid
mysqld_safe[6186]: ended

[1]+  Done                    mysqld_safe --skip-grant-tables

Step # 6: Start MySQL server and test it

# /etc/init.d/mysql start
# mysql -u root -p

JAVA connection with MySQL using JDBC in Eclipse

We will discuss JAVA-MySQL connection using JDBC (Java Database Connectivity)

JDBC:

JDBC is a standard API that allows JAVA programs to access databases. The JDBC API is a collection of interfaces and classes written in the JAVA Programming Language. We can write applications that connect to databases, send SQL queries, and get the results using these standard interfaces and classes.

A JDBC driver implements these interfaces and classes for a particular Database Management System. A Java Code loads the specified driver for a particular DBMS before it establish a connection with a database.

Download JDBC Driver:

First of all you have to download JDBC driver (usually named mysql-connector-java-version).
For Example: http://ftp.fju.edu.tw/Database/MySQL/Downloads/Connector-J/

Extract downloaded zip file and copy extracted folder to your plugins folder in Eclipse Directory.
For Example: C:\Eclipse\plugins\mysql-connector-java-version

Import JDBC Driver in Eclipse.

1. Right Click on your Project in Eclipse -> Select Properties.
2. Select Java Build Path->selcect Libraries tab->press Add External JARs button.
3. Select mysql-connector-java-version-bin file from downloaded mysql-connector-java-version folder.

Done. Now you are ready to establish JAVA-MySQL connection.

JAVA Code Example:

For Example we have a database named “riksof” with a table employees(id,name,email,designation) where “id” is primary key and auto_increment.

/*Define a connection url*/
String host = "localhost";
String db = "riksof";
String tb = "employees";
String db_user = "dbuser";
String db_pw = "dbpassword";

String db_url = "jdbc:mysql://"+host+":3306/"+db+"?user="+db_user+"&password="+db_pw;

Connection conn = null;
Statement stmt = null;
String query = "";
ResultSet result = null;
PreparedStatement ps = null;



/* Load driver and Establish a connection */
try{
conn = DriverManager.getConnection (db_url , db_user , db_pw);
stmt = conn.createStatement();
}catch(Exception connectionExp){
System.out.println("SQL Connection not Established: " + connectionExp.getMessage());
}

try{
Class.forName("com.mysql.jdbc.Driver").newInstance();
}catch(Exception driverExp){
System.out.println("Driver not Found : " + driverExp.getMessage());
}



/* Now Display all records */
query = "SELECT * FROM " + tb;
try{
result = stmt.executeQuery(query);

while(result.next()){
System.out.println(result.getString("id"));
System.out.println(result.getString("name"));
System.out.println(result.getString("email"));
System.out.println(result.getString("designation"));
System.out.println("-------------------------------");
}
}
catch(Exception sqlExp){
System.out.println("SQL Exception: " + sqlExp);
}



/*Insert a single record*/
query = "INSERT INTO employees(name,email,designation) VALUES('Name','Email','Designation')";

try{
conn.createStatement().executeUpdate(query);
System.out.println("Record Stored.");
}
catch (SQLException insertExp) {
System.out.println("SQLException Caught: " + insertExp.getMessage());
}