SQLite, a lightweight database, is a relational database management system that complies with ACID. It is included in a relatively small C library. It is a public domain project established by D. Richard Hipp. Its design goal is embedded, and it has been used in many embedded products at present. It occupies very low resources. In embedded devices, it may only require a few hundred K of memory. It can be used in mainstream operating systems such as Windows / Linux / Unix, and can be combined with many programming languages, such as Tcl, C #, PHP, Java, etc., as well as ODBC interface, which is also comparable to the two open source worlds of Mysql and PostgreSQL In terms of well-known database management systems, its processing speed is faster than them. The first Alpha version of SQLite was born in May 2000. It has been 15 years since 2015, and SQLite has also ushered in a version SQLite 3 has been released.
Mainstream sqlite3, small memory usage, fast processing speed, cross-platform
01, download
https://www.sqlite.org/download.html
02. Installation
bin file installation
Unzip the downloaded file and put it in / usr / bin /
rpm file installation
yum install -y sqlite sqlite-devel
03, running
sqlite3
04 、 Test basic commands
sqlite3 test.db #Create a database
create table mytable (id integer primary key, value text);
insert into mytable (id, value) values (1, ‘Micheal’);
select * from mytable;
### Set formatted query results
sqlite> .mode column;
sqlite> .header on;
sqlite> select * from test;
id value
----------- -------------
1 Micheal
2 Jenny
3 Francis
4 Kerk
.mode column will be set to the column display mode, .header will display the column name
Modify the table structure and add columns:
sqlite> alter table mytable add column email text not null ‘‘ colate nocase ;;
Create a view:
sqlite> create view nameview as select * from mytable;
Create an index:
sqlite> create index test_idx on mytable (value);
Display table structure:
sqlite> .schema [table]
Get all tables and views:
sqlite> .tables
Get the index list of the specified table:
sqlite> .indices [table]
Export database to SQL file:
sqlite> .output [filename]
sqlite> .dump
sqlite> .output stdout
Import database from SQL file:
sqlite> .read [filename]
Format the output data to CSV format:
sqlite> .output [filename.csv]
sqlite> .separator,
sqlite> select * from test;
sqlite> .output stdout
Import data from the CSV file into the table:
sqlite> create table newtable (id integer primary key, value text);
sqlite> .import [filename.csv] newtable
backup database:
/ * usage: sqlite3 [database] .dump> [filename] * /
sqlite3 mytable.db .dump> backup.sql
Restore the database:
/ * usage: sqlite3 [database] <[filename] * /
sqlite3 mytable.db <backup.sql
Help information for sqlite3
sqlite> .help
.backup? db? file backup db (default "main") to file
.bail on | off stop after hitting an error. default off
.databases list names and files of attached databases
.dump? table? ... dump the database in an sql text format
if table specified, only dump tables matching
like pattern table.
.echo on | off turn command echo on or off
.exit exit this program
.explain on | off turn output mode suitable for explain on or off.
.genfkey? options? options are:
--no-drop: do not drop old fkey triggers.
--ignore-errors: ignore tables with fkey errors
--exec: execute generated sql immediately
see file tool / genfkey.readme in the source
distribution for further information.
.header (s) on | off turn display of headers on or off
.help show this message
.import file table import data from file into table
.indices? table? show names of all indices
if table specified, only show indices for tables
matching like pattern table.
.load file? entry? load an extension library
.mode mode? table? set output mode where mode is one of:
csv comma-separated values
column left-aligned columns. (see .width)
html html <table> code
insert sql insert statements for table
line one value per line
list values delimited by .separator string
tabs tab-separated values
tcl tcl list elements
.nullvalue string print string in place of null values
.output filename send output to filename
.output stdout send output to the screen
.prompt main continue replace the standard prompts
.quit exit this program
.read filename execute sql in filename
.restore? db? file restore content of db (default "main") from file
.schema? table? show the create statements
if table specified, only show tables matching
like pattern table.
.separator string change separator used by output mode and .import
.show show the current values for various settings
.tables? table? list names of tables
if table specified, only list tables matching
like pattern table.
.timeout ms try opening locked tables for ms milliseconds
.width num num ... set column widths for "column" mode
.timer on | off turn the cpu timer measurement on or off
Encounter problems, solve problems, think about problems.
Linux install SQLite lightweight database
