1.( xx and xx) or ( xx and xx)

实例代码:

BaUserExample baUserExample = new BaUserExample();

Criteria criteria1 = baUserExample.createCriteria();
criteria1.andOrgIdEqualTo("1");
criteria1.andDeptIdEqualTo("1");

Criteria criteria2 = baUserExample.createCriteria();
criteria2.andUserNameEqualTo("name");
criteria2.andEmailLike("%test@%");

baUserExample.or(criteria2);

userMapper.countByExample(baUserExample);

执行的sql语句:

==>  Preparing: select count(*) from ba_user WHERE ( org_id = ? and dept_id = ? ) or( user_name = ? and email like ? )

2.xx and ( xx or xx)

暂时没找到直接的sql语句构造方法,但是经过转换还是可以实现的

根据逻辑表达式可以知道 a and ( b or c ) = ( a and b) or ( a and c )

所以就转变成第一种方法

举个例子,假如想要实现 select count(*) from ba_user WHERE userName like ? and ( dept_id is null or dept_id <>? )

可以转化为select count(*) from ba_user WHERE (userName like ? and  dept_id is null ) or ( userName like ? and  dept_id <>? )

实例代码:

BaUserExample baUserExample = new BaUserExample();

Criteria criteria1 = baUserExample.createCriteria();
criteria1.andUserNameLike("%name%");
criteria1.andDeptIdIsNull();

Criteria criteria2 = baUserExample.createCriteria();
criteria2.andUserNameLike("%name%");
criteria2.andDeptIdNotEqualTo("1");

baUserExample.or(criteria2);

userMapper.countByExample(baUserExample);

执行的sql语句:

==>  Preparing: select count(*) from ba_user WHERE ( user_name like ? and dept_id is null ) or( user_name like ? and dept_id <> ? )

这算是一种取巧的方法吧,对于这样的问题可以自己编写mapper.xml文件,或者在代码里面过滤,还有一种思路就是修改Criteria的代码实现and和or功能调换(还没尝试过)。