Criteria MongoTemplate achieve the query with not none conditions - mongodb

Question

I am a beginner in Spring MongoDB Criteria.
Once my database was mysql,if the variable is not none,I can do not none query like this:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="org.mytest.modules.system.mapper.SysUserMapper">
<select id="getSysUser" resultType="org.mytest.modules.system.entity.SysUser">
select * from sys_user where del_flag = 0
<if test="username!=null and username!=''">
and username = #{username}
</if>
<if test="age!=null and age!=''">
and age = #{age}
</if>
<if test="profession!=null and profession!=''">
and profession = #{profession}
</if>
<if test="education!=null and education!=''">
and education = #{education}
</if>
<if test="dateStart!=null">
<![CDATA[ and DATE_FORMAT(time, '%Y-%m-%d %H:%T:%s') >=
DATE_FORMAT(#{dateStart} , '%Y-%m-%d %H:%T:%s') ]]>
</if>
<if test="dateEnd!=null">
<![CDATA[ and DATE_FORMAT(time, '%Y-%m-%d %H:%T:%s') <=
DATE_FORMAT(#{dateEnd} , '%Y-%m-%d %H:%T:%s') ]]>
</if>
</select>
</mapper>
Now my database change to mongoDB.How to do it with Criteria MongoTemplate with Criteria().andOperator?

Answer 1

SysUser sysUser = new SysUser();
// Create criteria object
Criteria criteria = Criteria.where("del_flag").is(0);
// Judge one by one
if (StringUtils.hasLength(sysUser.getUsername())) {
criteria = criteria.and("username").is(sysUser.getUsername());
}
if (Objects.nonNull(sysUser.getAge())) {
criteria = criteria.and("age").is(sysUser.getAge());
}
if (StringUtils.hasLength(sysUser.getProfession())) {
criteria = criteria.and("profession").is(sysUser.getProfession());
}
if (StringUtils.hasLength(sysUser.getEducation())) {
criteria = criteria.and("education").is(sysUser.getEducation());
}
if (Objects.nonNull(sysUser.getDateStart())) {
criteria = criteria.and("dateStart").gte(sysUser.getDateStart());
}
if (Objects.nonNull(sysUser.getDateEnd())) {
criteria = criteria.and("dateEnd").lte(sysUser.getDateEnd());
}
Query query = new Query(criteria);
List<SysUser> sysUserList = mongoTemplate.find(query, SysUser.class, "sys_user");