android如何使用匹配从数据库中选择数据

Question

我从数据库中获取与任何优势相匹配的数据如何在变量的两端添加％？下面是我的查询我想添加'“+ School_name +”'到这个'％“+ School_name +”％'如何做到这一点？

        Cursor mCursor3 = db.selectQuery("SELECT * FROM uss_school sch LEFT JOIN uss_school_to_level sl ON  sch.school_id = sl.school_id LEFT JOIN uss_level l ON sl.level_id = l.level_id WHERE sch.name like '"+School_name+"'");