（android之sqlite三）sql语句中查询带通配符的数据，如下划线 星号等

# %代表任意多个字符

select * from user where username like '%huxiao';

select * from user where username like 'huxiao%';

select * from user where username like '%huxiao%';

# _代表一个字符

select * from user where username like '_';

select * from user where username like '______';

select * from user where username like 'huxia_';

select * from user where username like 'h_xiao';

# 如果我就真的要查%或者_，怎么办呢？使用escape，转义字符后面的%或_就不作为通配符了，注意前面没有转义字符的%和_仍然起通配符作用

select username from gg_user where username like '%xiao\_%' escape '\';

select username from gg_user where username like '%xiao\%%' escape '\';

通常使用'\'来做转义字符,但是也可以使用其他的符号