SQLite，是一款輕型的數據庫，是遵守ACID的關系型數據庫管理系統，它包含在一個相對小的C庫中。它是D.RichardHipp建立的公有領域項目。它的設計目標是嵌入式的，而且目前已經在很多嵌入式產品中使用了它，它占用資源非常的低，在嵌入式設備中，可能只需要幾百K的內存就夠了。它能夠Windows/Linux/Unix等等主流的操作系統，同時能夠跟很多程序語言相結合，比如 Tcl、C#、PHP、Java等，還有ODBC接口，同樣比起Mysql、PostgreSQL這兩款開源的世界著名數據庫管理系統來講，它的處理速度比他們都快。SQLite第一個Alpha版本誕生於2000年5月。 至2015年已經有15個年頭，SQLite也迎來了一個版本 SQLite 3已經發布。
主流的sqlite3，占用內存小，處理時速度快，跨平台
01、下載
https://www.sqlite.org/download.html
02、安裝
bin文件安裝
解壓下載的文件，放到 /usr/bin/
rpm文件安裝
yum install -y sqlite sqlite-devel
03、運行
sqlite3
04、測試基本命令
sqlite3 test.db #創建數據庫
create table mytable(id integer primary key, value text);
insert into mytable(id, value) values(1, 'Micheal');
select * from mytable;
###設置格式化查詢結果
sqlite> .mode column;
sqlite> .header on;
sqlite> select * from test;
id value
----------- -------------
1 Micheal
2 Jenny
3 Francis
4 Kerk
.mode column 將設置為列顯示模式，.header 將顯示列名
修改表結構，增加列：
sqlite> alter table mytable add column email text not null '' collate nocase;;
創建視圖：
sqlite> create view nameview as select * from mytable;
創建索引：
sqlite> create index test_idx on mytable(value);
顯示表結構：
sqlite> .schema [table]
獲取所有表和視圖：
sqlite > .tables
獲取指定表的索引列表：
sqlite > .indices [table ]
導出數據庫到 SQL 文件：
sqlite > .output [filename ]
sqlite > .dump
sqlite > .output stdout
從 SQL 文件導入數據庫：
sqlite > .read [filename ]
格式化輸出數據到 CSV 格式：
sqlite >.output [filename.csv ]
sqlite >.separator ,
sqlite > select * from test;
sqlite >.output stdout
從 CSV 文件導入數據到表中：
sqlite >create table newtable ( id integer primary key, value text );
sqlite >.import [filename.csv ] newtable
備份數據庫：
/* usage: sqlite3 [database] .dump > [filename] */
sqlite3 mytable.db .dump > backup.sql
恢復數據庫：
/* usage: sqlite3 [database ] < [filename ] */
sqlite3 mytable.db < backup.sql
sqlite3的幫助信息
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
遇到問題，解決問題，思考問題。