为了方便调试，简单介绍下android串口下如何修改数据库的值。
第一种方式使用sqlite3命令：
1、首先进入sqlite3命令模式：
**shell@ubuntu:/Database # sqlite3 user_setting.db
SQLite version 3.7.11 2012-03-20 11:35:50
Enter “.help” for instructions
Enter SQL statements terminated with a “;”
sqlite>**
简单几点说明：
可以输入.help查看命令帮助说明
常用的命令，查看有哪些数据表：.tables; 退出sqlite3命令模式：.quit
如果要删除字符，需要使用Ctrl + Backspace。
2、查看某个表的值：
查看所有列：select * from tbl_SystemSetting; （注意要有分号 ; ）
输出结果：
*sqlite> select from tbl_SystemSetting;
0|0|0|0|0|2|50|0|0|0|26|0|0|0|4|0|1|0|0|0|3|5000|0|1|0|8|0|0|0|2|0|0|1|0|0|1|4|0|0|0|0|0|0|0|3|1|1|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|1|0|0|65535|0|1|4|0|1|1|1|1|1|1|0|100|50|1|1**
查看单独某一列的值，具体列的名称需要去查对应的sql文件：select enInputSourceType from tbl_SystemSetting;
输出结果：
sqlite> select enInputSourceType from tbl_SystemSetting;
2
3、更新某个字段值： update tbl_SystemSetting set enInputSourceType=1;
输出结果：
**sqlite> update tbl_SystemSetting set enInputSourceType=1;
sqlite> select enInputSourceType from tbl_SystemSetting;
1**
第二种方式使用content命令，这种方式比较“美观”
shell下输入 content，会输出一下用法信息
*usage: adb shell content [subcommand] [options]
usage: adb shell content insert –uri [–user ] –bind [–bind …]
a content provider URI.
binds a typed value to a column and is formatted:
:: where:
specifies data type such as:
b - boolean, s - string, i - integer, l - long, f - float, d - double
Note: Omit the value for passing an empty string, e.g column:s:
Example:
Add “new_setting” secure setting with value “new_value”.
adb shell content insert –uri content://settings/secure –bind name:s:new_setting –bind value:s:new_value
usage: adb shell content update –uri [–user ] [–where ]
is a SQL style where clause in quotes (You have to escape single quotes - see example below).
Example:
Change “new_setting” secure setting to “newer_value”.
adb shell content update –uri content://settings/secure –bind value:s:newer_value –where “name=’new_setting’”
usage: adb shell content delete –uri [–user ] –bind [–bind …] [–where ]
Example:
Remove “new_setting” secure setting.
adb shell content delete –uri content://settings/secure –where “name=’new_setting’”
usage: adb shell content query –uri [–user ] [–projection ] [–where ] [–sort ]
is a list of colon separated column names and is formatted:
[:…]
is the order in which rows in the result should be sorted.
Example:
Select “name” and “value” columns from secure settings where “name” is equal to “new_setting” and sort the result by name in ascending order.
adb shell content query –uri content://settings/secure –projection name:value –where “name=’new_setting’” –sort “name ASC”
usage: adb shell content call –uri –method [–arg ]
[–extra …]
is the name of a provider-defined method
is an optional string argument
is like –bind above, typed data of the form :{b,s,i,l,f,d}:
1、查询
命令行输入：content query –uri content://abcd.tv.usersetting/systemsetting
输出结果：
Row: 0 _id=0, fRunInstallationGuide=0, fNoChannel=0, bDisableSiAutoUpdate=0, bDisableDynamicRescan=0, enInputSourceType=1, Country=50, enCableOperators=0, enSatellitePlatform=0, u16NetworkId=0, Language=26, en3DARC=0, enSPDIFMODE=0, fSoftwareUpdate=0, U8OADTime=4, fOADScanAfterWakeup=0, fAutoVolume=1, fDcPowerOFFMode=0, DtvRoute=0, ScartOutRGB=0, U8Transparency=3, u32MenuTimeOut=5000, AudioOnly=0, bEnableWDT=1, u8FavoriteRegion=0, u8Bandwidth=8, u8TimeShiftSizeType=0, fOadScan=0, bEnablePVRRecordAll=0, u8ColorRangeMode=2, u8HDMIAudioSource=0, bEnableAlwaysTimeshift=0, eSUPER=1, bUartBus=0, m_AutoZoom=0, bOverScan=1, m_u8BrazilVideoStandardType=4, m_u8SoftwareUpdateMode=0, OSD_Active_Time=0, m_MessageBoxExist=0, u16LastOADVersion=0, bEnableAutoChannelUpdate=0, u32PvrSettingId=0, enForcedInputSourceType=0, enLocalDimm=3, bATVChSwitchFreeze=1, bSourceDetectEnable=1, bAutoSourceSwitch=0, u32MsrvTimerCounter=0, standbyNoOperation=0, standbyNoSignal=0, screenSaveMode=0, bAutoMHLSwitch=0, bViewerPrompt=0, u8OpMode=0, u32CicamIdentifier=0, bEnableHbbtv=0, bWOLEnable=0, u32StrPowerMode=0, bEnableACR=0, bSourcePreview=0, bMonitorITC=0, bxvYCCOnOff=0, bEnableStoreCookies=1, bServiceListNeedRearrange=0, bCiOccupiedTuner=0, u16CiPinCode=65535, u16HdmidEdidVersion=0, enMemoryInputSource=1, TTX_Language=4, bBlueScreenMode=0, bMainAutoDetectHdrLevel=1, bSubAutoDetectHdrLevel=1, u8MainHdrLevel=1, u8SubHdrLevel=1, bMainHdrOn=1, bSubHdrOn=1, bDCRStatus=0, bDCRBacklightMAX=100, bDCRBacklightRange=50, bDCRBacklightStep=1, bDCRStepTime=1*
查询某一列，即某个字段的值：content query –uri content://abcd.tv.usersetting/systemsetting –projection enInputSourceType
输出结果：
Row: 0 enInputSourceType=1
2、更新某个字段数据值
比如我要更新enInputSourceType为2，它的数据类型为int，那么命令如下：
content update –uri content://abcd.tv.usersetting/systemsetting –bind enInputSourceType:i:2 //用冒号分隔第一部分为字段名称，第二部分为字段类型，第三部分为最终要写入的值
比较常用的应该就是查询以及删除，具体要了解代码如何实现，可以去看 android/frameworks/base/cmds/content/src/com/android/commands/content/Content.java