CentOS自带sqlite3。如果没带按照下面的方式安装

安装sqlite3

1、下载sqlite3安装包

wget https://www.sqlite.org/2022/sqlite-autoconf-3380000.tar.gz

2、解压安装包

tar zxvf sqlite-autoconf-3380000.tar.gz 

3、依次执行下面的命令 ，就安装ok了

cd sqlite-autoconf-3380000/

./configure

 make

sudo make install

sudo yum install sqlite-devel

4、在命令行下输入sqlite3就可以看到以下信息，说明安装成功了。

[root@localhost sqlite-autoconf-3380000]$ sqlite3 
SQLite version 3.38.0.0 2022-02-28 20:00:57
Enter ".help" for usage hints.
Connected to a transient in-memory database.
Use ".open FILENAME" to reopen on a persistent database.
sqlite>

输入.quit就可以退出sqlite3。

sqlite> .quit

连结sqlite数据库

$ sqlite3 ex1
SQLite version 3.36.0 2021-06-18 18:36:39
Enter ".help" for usage hints.
sqlite> create table tbl1(one varchar(10), two smallint);
sqlite> insert into tbl1 values('hello!',10);
sqlite> insert into tbl1 values('goodbye', 20);
sqlite> select * from tbl1;
hello!|10
goodbye|20
sqlite>

查看帮助信息和相关语法

sqlite> .help
.archive ...             Manage SQL archives
.auth ON|OFF             Show authorizer callbacks
.backup ?DB? FILE        Backup DB (default "main") to FILE
.bail on|off             Stop after hitting an error.  Default OFF
.binary on|off           Turn binary output on or off.  Default OFF
.cd DIRECTORY            Change the working directory to DIRECTORY
.changes on|off          Show number of rows changed by SQL
.check GLOB              Fail if output since .testcase does not match
.clone NEWDB             Clone data into NEWDB from the existing database
.connection [close] [#]  Open or close an auxiliary database connection
.databases               List names and files of attached databases
.dbconfig ?op? ?val?     List or change sqlite3_db_config() options
.dbinfo ?DB?             Show status information about the database
.dump ?OBJECTS?          Render database content as SQL
.echo on|off             Turn command echo on or off
.eqp on|off|full|...     Enable or disable automatic EXPLAIN QUERY PLAN
.excel                   Display the output of next command in spreadsheet
.exit ?CODE?             Exit this program with return-code CODE
.expert                  EXPERIMENTAL. Suggest indexes for queries
.explain ?on|off|auto?   Change the EXPLAIN formatting mode.  Default: auto
.filectrl CMD ...        Run various sqlite3_file_control() operations
.fullschema ?--indent?   Show schema and the content of sqlite_stat tables
.headers on|off          Turn display of headers on or off
.help ?-all? ?PATTERN?   Show help text for PATTERN
.import FILE TABLE       Import data from FILE into TABLE
.imposter INDEX TABLE    Create imposter table TABLE on index INDEX
.indexes ?TABLE?         Show names of indexes
.limit ?LIMIT? ?VAL?     Display or change the value of an SQLITE_LIMIT
.lint OPTIONS            Report potential schema issues.
.load FILE ?ENTRY?       Load an extension library
.log FILE|off            Turn logging on or off.  FILE can be stderr/stdout
.mode MODE ?TABLE?       Set output mode
.nonce STRING            Disable safe mode for one command if the nonce matches
.nullvalue STRING        Use STRING in place of NULL values
.once ?OPTIONS? ?FILE?   Output for the next SQL command only to FILE
.open ?OPTIONS? ?FILE?   Close existing database and reopen FILE
.output ?FILE?           Send output to FILE or stdout if FILE is omitted
.parameter CMD ...       Manage SQL parameter bindings
.print STRING...         Print literal STRING
.progress N              Invoke progress handler after every N opcodes
.prompt MAIN CONTINUE    Replace the standard prompts
.quit                    Exit this program
.read FILE               Read input from FILE
.recover                 Recover as much data as possible from corrupt db.
.restore ?DB? FILE       Restore content of DB (default "main") from FILE
.save FILE               Write in-memory database into FILE
.scanstats on|off        Turn sqlite3_stmt_scanstatus() metrics on or off
.schema ?PATTERN?        Show the CREATE statements matching PATTERN
.selftest ?OPTIONS?      Run tests defined in the SELFTEST table
.separator COL ?ROW?     Change the column and row separators
.session ?NAME? CMD ...  Create or control sessions
.sha3sum ...             Compute a SHA3 hash of database content
.shell CMD ARGS...       Run CMD ARGS... in a system shell
.show                    Show the current values for various settings
.stats ?ARG?             Show stats or turn stats on or off
.system CMD ARGS...      Run CMD ARGS... in a system shell
.tables ?TABLE?          List names of tables matching LIKE pattern TABLE
.testcase NAME           Begin redirecting output to 'testcase-out.txt'
.testctrl CMD ...        Run various sqlite3_test_control() operations
.timeout MS              Try opening locked tables for MS milliseconds
.timer on|off            Turn SQL timer on or off
.trace ?OPTIONS?         Output each SQL statement as it is run
.vfsinfo ?AUX?           Information about the top-level VFS
.vfslist                 List all available VFSes
.vfsname ?AUX?           Print the name of the VFS stack
.width NUM1 NUM2 ...     Set minimum column widths for columnar output
sqlite>

简单sql语句使用：

在任意目录下新建一个数据库,比如student 。
命令: sqlite3 student.db
输入sql语句create table user(username text primary key, password text); 建一张user表
输入sql语句insert into user values("baoli", "123"); 插入一条数据。
输入sql语句select * from user; 可以查看user表.
输入sql语句delete from user where username='baoli'; 删除指定的一个记录。
注：输入sql命令是记得结尾的';'号。

SQLite支持如下5种数据类型

1.NULL：空值。
2.INTEGER：带符号的整型，具体取决有存入数字的范围大小。
3.REAL：浮点数字，存储为8-byte IEEE浮点数。
4.TEXT：字符串文本。
5.BLOB：二进制对象。

一些常用命令

查看当前数据库的所有数据表：.tables
查看当前所有数据库：.databases
打开或创建一个表：sqlite3 test.db
可视化打开数据库：sqlitebrowser student.db
注：需要：sudo apt-get install sqlitebrowser

范例：

输入下面的命令，删除default.db下的xx表中的id为9073的行，并退出。

cd /panel/data/
sqlite3 default.db
delete from xx where id = '9073';
.exit