Java : Variables Declaring

To create a new database in your PostgreSQL. PostgreSQL provides two ways of creating a new database −

• Using CREATE DATABASE, an SQL command.
• Using createdb a command-line executable.

Using CREATE DATABASE

This command will create a database from PostgreSQL shell prompt, but you should have appropriate privilege to create a database. By default, the new database will be created by cloning the standard system database template1.

Syntax

The basic syntax of CREATE DATABASE statement is as follows −

CREATE DATABASE dbname;

where dbname is the name of a database to create.

Example

The following is a simple example, which will create testdb in your PostgreSQL schema

postgres=# CREATE DATABASE testdb;
postgres-# 

Using createdb Command

PostgreSQL command line executable createdb is a wrapper around the SQL command CREATE DATABASE. The only difference between this command and SQL command CREATE DATABASE is that the former can be directly run from the command line and it allows a comment to be added into the database, all in one command.

Syntax

The syntax for createdb is as shown below −

createdb [option...] [dbname [description]]

Parameters

The table given below lists the parameters with their descriptions.

Options

The following table lists the command line arguments createdb accepts −

Open the command prompt and go to the directory where PostgreSQL is installed. Go to the bin directory and execute the following command to create a database.

createdb -h localhost -p 5432 -U postgres testdb
password ******

The above given command will prompt you for password of the PostgreSQL admin user, which is postgres, by default. Hence, provide a password and proceed to create your new database

Once a database is created using either of the above-mentioned methods, you can check it in the list of databases using \l, i.e., backslash el command as follows −

postgres-# \l
                             List of databases
   Name    |  Owner   | Encoding | Collate | Ctype |   Access privileges   
-----------+----------+----------+---------+-------+-----------------------
 postgres  | postgres | UTF8     | C       | C     | 
 template0 | postgres | UTF8     | C       | C     | =c/postgres          +
           |          |          |         |       | postgres=CTc/postgres
 template1 | postgres | UTF8     | C       | C     | =c/postgres          +
           |          |          |         |       | postgres=CTc/postgres
 testdb    | postgres | UTF8     | C       | C     | 
(4 rows)

postgres-#