MongoDB中关于Criteria的各种查询实例(is、in、regex、gte、lte、elemMatch)

例如：实体中有一集合，包含三个元素，A、B、C，实现至少含有其中一个元素就可以查询到此实体的时候就需要使用elemMatch来进行查询

package cn.com.qiyitech.qiyibiz.model.item;

import cn.com.qiyitech.pfw.entity.PlatformAsset;
import cn.com.qiyitech.pfw.model.PlatformBaseFilter;
import cn.com.qiyitech.qiyibiz.entity.Item;
import cn.com.qiyitech.qiyibiz.entity.ItemFabric;
import cn.com.qiyitech.qiyibiz.entity.ItemOrder;
import cn.com.qiyitech.qiyibiz.entity.Shop;
import io.swagger.annotations.ApiModelProperty;
import lombok.Getter;
import lombok.Setter;
import org.springframework.data.mongodb.core.query.Criteria;

import java.util.Set;
@Setter
@Getter
public class ItemListFilter extends PlatformBaseFilter {

@ApiModelProperty(value = "商品名称")
private String name;

@ApiModelProperty(value = "所属店铺ID")
private Set<String> owner;

@ApiModelProperty(value = "幅宽最大值")
private Integer maxWidthCloth;

@ApiModelProperty(value = "幅宽最小值")
private Integer minWidthCloth;

@ApiModelProperty(value = "克重单位")
private String weightUnit;

@ApiModelProperty(value = "产品规格")
private String[] specification;

@Override
public Criteria genCriteria() {
Criteria criteria = new Criteria();
if (specification != null && specification.length > 0)
criteria = criteria.and(Item.FIELD_SPECIFICATION).elemMatch(new Criteria().in(specification));
if (owner != null)
criteria = criteria.and(PlatformAsset.FIELD_OWNER).in(owner);
if (name != null)
criteria = criteria.and(PlatformAsset.FIELD_NAME).regex(".*" + name + ".*");
if (minWidthCloth != null || maxWidthCloth != null) {
if (minWidthCloth == null) {
minWidthCloth = 0;
}
if (maxWidthCloth == null) {
maxWidthCloth = Integer.MAX_VALUE;
}
criteria = criteria.and(Item.FIELD_WIDTH_CLOTH).gte(minWidthCloth).lte(maxWidthCloth);
}
if (weightUnit != null)
criteria = criteria.and(Item.FIELD_WEIGHT_UNIT).is(weightUnit);
return criteria;
}
}