前言

sqlite3 提供了较轻便的数据库操作，速度非常快，也比较稳定，在嵌入式产品中用的非常广泛，但嵌入式产品往往由于不稳定性因素非常多，备份是必不可少的，直接拷贝 .db 文件并不是太好的主意，所以引出本文所要讲的主题：sqlite3 导入/导出sql 语句。

导出

root@CATON:~# sqlite3 db/boardsprofile.db 
sqlite version 3.6.0
Enter ".help" for instructions
Enter sql statements terminated with a ";"
sqlite> .tables   
A04Profile      BPMProfile      HDERProfile     LNBProfile      VMUX          
A13Profile      CAMProfile      HDESLProfile    LNBTProfile     router_table  
A22Profile      DDOProfile      IPASIINProfile  MDOProfile      system_profile
A31Profile      DSDE1VProfile   IPASIProfile    MUXProfile    
A40Profile      DSDEProfile     IPMOutProfile   MVProfile     
ADOProfile      HDDOProfile     IPMProfile      P1            
ASDEProfile     HDELProfile     LNBBissProfile  P6            
sqlite> 

sqlite> .dump                  
BEGIN TRANSACTION;
CREATE TABLE DDOProfile  (key varchar(255) PRIMARY KEY,value text);
INSERT INTO "DDOProfile" VALUES('boardType','DDOProfile');
INSERT INTO "DDOProfile" VALUES('main_input_num','0');
INSERT INTO "DDOProfile" VALUES('main_output_num','0');
INSERT INTO "DDOProfile" VALUES('sub_input_num','1');
INSERT INTO "DDOProfile" VALUES('sub_output_num','0');
INSERT INTO "DDOProfile" VALUES('sub_in_0','1');
INSERT INTO "DDOProfile" VALUES('PlaySrc0','');
INSERT INTO "DDOProfile" VALUES('Default_Pict0','3');
INSERT INTO "DDOProfile" VALUES('AVSync','0');
INSERT INTO "DDOProfile" VALUES('Decoder_WorkMode','0');
INSERT INTO "DDOProfile" VALUES('Output_Format','3');
INSERT INTO "DDOProfile" VALUES('Aspect_Ratio','0');
INSERT INTO "DDOProfile" VALUES('AR_Convert','0');
INSERT INTO "DDOProfile" VALUES('Aud_Mute','0');
INSERT INTO "DDOProfile" VALUES('Aud_Level','32');
INSERT INTO "DDOProfile" VALUES('Aud_STCOffset','0');
INSERT INTO "DDOProfile" VALUES('Aud_Buff','0');
INSERT INTO "DDOProfile" VALUES('Aud_Mode','0');
INSERT INTO "DDOProfile" VALUES('Aud_DigitalOut','0');
INSERT INTO "DDOProfile" VALUES('Aud2_Mute','0');
INSERT INTO "DDOProfile" VALUES('Aud2_Level','32');
INSERT INTO "DDOProfile" VALUES('Aud2_STCOffset','0');
INSERT INTO "DDOProfile" VALUES('Aud2_Buff','0');

....

.dump 命令就是导出了，这里直接导出到输出了，而且非常多。导出到文件将是这样的：

sqlite3 db/boardsprofile.db ".dump" > /var/ftp/profile.sql

导入

sqlite3 test.db ".read /var/ftp/profile.sql"  

root@CATON:~# sqlite3 test.db ".read /var/ftp/profile.sql"              
root@CATON:~# sqlite3 test.db  
sqlite version 3.6.0
Enter ".help" for instructions
Enter sql statements terminated with a ";"
sqlite> .tables
A04Profile      BPMProfile      HDERProfile     LNBProfile      VMUX          
A13Profile      CAMProfile      HDESLProfile    LNBTProfile     router_table  
A22Profile      DDOProfile      IPASIINProfile  MDOProfile      system_profile
A31Profile      DSDE1VProfile   IPASIProfile    MUXProfile    
A40Profile      DSDEProfile     IPMOutProfile   MVProfile     
ADOProfile      HDDOProfile     IPMProfile      P1            
ASDEProfile     HDELProfile     LNBBissProfile  P6            
sqlite> 

用处

让用户直接下载db文件并不是一个很好的决定，用户备份，我比较倾向于，保存sql语句即可。