SQLite项目提供了一个简单的命令行程序sqlite3，它允许用户对SQLite数据库手动输入和执行SQL语句。更多详情可参考官网（https://www.sqlite.org/cli.html）。
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help
SQLite shell命令的help信息如下：
.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
.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
.indexes ?TABLE? Show names of indexes
.intck ?STEPS_PER_UNLOCK? Run an incremental integrity check on the db
.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|on|off Turn logging on or off. FILE can be stderr/stdout
.mode MODE ?OPTIONS? Set output mode
.nonce STRING Suspend safe mode for one command if 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
.prompt MAIN CONTINUE Replace the standard prompts
.quit Stop interpreting input stream, exit if primary.
.read FILE Read input from FILE or command output
.recover Recover as much data as possible from corrupt db.
.restore ?DB? FILE Restore content of DB (default "main") from FILE
.save ?OPTIONS? FILE Write database to FILE (an alias for .backup ...)
.scanstats on|off|est Turn sqlite3_stmt_scanstatus() metrics on or off
.schema ?PATTERN? Show the CREATE statements matching PATTERN
.separator COL ?ROW? Change the column and row separators
.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
.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
.version Show source, library and compiler versions
.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
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SQL语句
执行sqlite3二进制文件（编译源码包所生成），键入SQL语句示例如下，创建表、插入数据、查询数据并按日期顺序排列：
如上，可以通过“.table”命令查看数据库文件中的表。另外，可以通过“.schema”命令显示数据库的完整架构。
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页面缓存
以下命令可以查看或暂时设置在内存中页面缓存的最大尺寸。其中pages值表示在缓存中的页面数。内置页面缓存的默认大小为 2000 页，最小尺寸为 10 页。一页表示1K。
pragma cache_size;
pragma cache_size = pages;例如设置1000页并查看页面缓存大小：
