Android开发sqlite中怎么把表清空

1.删除表参考：

SQLiteDatabase.execSQL("DROPTABLE CUSTOMERS")

2.清除表中所有记录参考：

SQLiteDatabase.execSQL("DELETEFROM CUSTOMERS")

注：CUSTOMERS是你的列表名称

直接删除数据库，数据库会自动重新创建

public

class

DatabaseHelper

extends

SQLiteOpenHelper

{

private

static

DatabaseHelper

mInstance

=

null

/**

数据库名称

**/

public

static

final

String

DATABASE_NAME

=

"xys.db"

/**

数据库版本号

**/

private

static

final

int

DATABASE_VERSION

=

1

/**数据库SQL语句

添加一个表**/

private

static

final

String

NAME_TABLE_CREATE

=

"create

table

test("

+

"_id

INTEGER

PRIMARY

KEY

AUTOINCREMENT,"

+

"name

TEXT,"+"hp

INTEGER

DEFAULT

100,"+

"mp

INTEGER

DEFAULT

100,"

+

"number

INTEGER)"

DatabaseHelper(Context

context)

{

super(context,

DATABASE_NAME,

null,

DATABASE_VERSION)

}

/**单例模式**/

static

synchronized

DatabaseHelper

getInstance(Context

context)

{

if

(mInstance

==

null)

{

mInstance

=

new

DatabaseHelper(context)

}

return

mInstance

}

@Override

public

void

onCreate(SQLiteDatabase

db)

{

/**向数据中添加表**/

db.execSQL(NAME_TABLE_CREATE)

}

@Override

public

void

onUpgrade(SQLiteDatabase

db,

int

oldVersion,

int

newVersion)

{

/**可以拿到当前数据库的版本信息

与之前数据库的版本信息

用来更新数据库**/

}

/**

*

删除数据库

*

@param

context

*

@return

*/

public

boolean

deleteDatabase(Context

context)

{

return

context.deleteDatabase(DATABASE_NAME)

}

}

delete from tableName //清空数据

update sqlite_sequence SET seq=0 where name='tableName'//自增长ID为0

Unsafe query: 'Delete' statement without 'where' clears all data in the table

遇到有删除约束问题的解决办法

可以选择一个能囊括所有记录的WHERE条件即可，一般有id的就 where id>0

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