sqlite-Open source, cross-platform, compact relational database-1

sqlite-Open source, cross-platform, compact relational database-1

Learn SQLite database in 1 hours

1. Introduction

SQLite is an open-source, embedded relational database that implements a self-contained, 0 configuration, transactional SQL database engine. It is characterized by its high portability, ease of use, compact structure, high efficiency and reliability. Unlike other database management systems, SQLite is very simple to install and run, in most cases-just make sure that sqlite binaries exist to start creating, connecting, and using the database. If you are looking for an embedded database project or solution, SQLite is definitely worth considering.

2. Installation

SQLite on Windows

1. Go to SQL download page: http://www.sqlite.org/download.html
2. To download the precompiled binaries package under Windows:
• sqlite-shell-win32-x86-<build#>. zip
• sqlite-dll-win32-x86-<build#>. zip
Note: <build#> is the compiled version number of SQLite
3. Unzip the zip file to your disk and add the extracted directory to the system's PATH variable for easy execution of the SQLite command at the command line.
4. Optional: If you plan to publish an application based on the SQLite database, you will also need to download the source code to compile and utilize its API
• sqlite-amalgamation-<build#>. zip

SQLite on Linux

A number of Linux distributions provide convenient commands to get SQLite:

/* For Debian or Ubuntu /*
$ sudo apt-get install sqlite3 sqlite3-dev
 
/* For RedHat, CentOS, or Fedora/*
$ yum install SQLite3 sqlite3-dev

SQLite on Mac OS X

If you are using Mac OS Snow Leopard or a newer version of the system, then the system is already equipped with SQLite.

3. Create your first SQLite database

Now that you have the SQLite database installed, we will create the first database. In the Command Line window, enter the following command to create a database named Test.db.

sqlite3test.db

To create a table:

sqlite> create table mytable(id integer primary key, value text);
 
2 columns were created.

The table contains a primary key field named ID and a text field named value.

Note: At a minimum, you must create a table or view for the newly created database so that you can save the database to disk or the database will not be created.

Next, write some data into the table:

sqlite> insert into mytable(id, value) values(1, ‘Micheal‘);
sqlite> insert into mytable(id, value) values(2, ‘Jenny‘);
sqlite> insert into mytable(value) values(‘Francis‘);
sqlite> insert into mytable(value) values(‘Kerk‘);

Query data:

sqlite> select * from test;
1|Micheal
2|Jenny
3|Francis
4|Kerk

To set the results of a formatted query:

sqlite> .mode column;
sqlite> .header on;
sqlite> select * from test;
id          value
----------- -------------
1           Micheal
2           Jenny
3           Francis
4           Kerk

The. Mode column is set to the column display mode, and the. Header displays the column name.

To modify the table structure, add columns:

sqlite> alter table mytable add column email text not null ‘‘ collate nocase;;

To create a view:

sqlite>createviewnameviewasselect*frommytable;

To create an index:

sqlite>createindextest_idxonmytable(value); 

4. Some useful SQLite commands

Show Table structure:
sqlite>. Schema [table]

Get all tables and views:

SQLite >. Tables

Gets the list of indexes for the specified table: SQLite >. indices [table]

To export a database to a SQL file:

SQLite >. output [filename]
SQLite > Dump
SQLite >. Output stdout

To import a database from a SQL file:

SQLite >. read [filename]

Format output data to CSV format:

SQLite >.output [Filename.csv]
SQLite >.separator,
SQLite > select * from Test;
SQLite >.output stdout

Import data from a CSV file into a table:

SQLite >create table newtable (ID integer primary key, value text);
SQLite >.import [Filename.csv] NewTable

To back up the database:
/* Usage:sqlite3 [Database]. dump > [filename] */
Sqlite3 mytable.db dump > Backup.sql

To recover a database:

/* Usage:sqlite3 [Database] < [filename] */
Sqlite3 Mytable.db < Backup.sql turn from: http://www.oschina.net/question/12_53183?sort=default&p=6#answers

sqlite-Open source, cross-platform, compact relational database-1