spring data mongo API learn(转)

显示操作mongo的语句，log4j里面加入：

log4j.logger.org.springframework.data.mongodb.core=DEBUG, mongodb
log4j.appender.mongodb=org.apache.log4j.ConsoleAppender
log4j.appender.mongodb.Target=System.out
log4j.appender.mongodb.Threshold=DEBUG
log4j.appender.mongodb.ImmediateFlush=true
log4j.appender.mongodb.layout=org.apache.log4j.PatternLayout
log4j.appender.mongodb.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} %5p %X{RequestId} - %m%n

MongoOptions/MongoTemplate:

常见查询方法：

public <T> T findOne(Query query, Class<T> entityClass)
public boolean exists(Query query, Class<?> entityClass)
public <T> List<T> find(Query query, Class<T> entityClass)
public <T> T findById(Object id, Class<T> entityClass)

public <T> T findAndModify(Query query, Update update, Class<T> entityClass)
public <T> T findAndModify(Query query, Update update, FindAndModifyOptions options, Class<T> entityClass)

public class FindAndModifyOptions {
<strong><span style="white-space:pre">    </span>boolean returnNew;   // 是否返回更新后的值
<span style="white-space:pre">    </span>boolean upsert;      // 没有找到是否插入 
<span style="white-space:pre">    </span>boolean remove;      // 找到是否删除</strong>
}

public <T> T findAndRemove(Query query, Class<T> entityClass)
public long count(Query query, Class<?> entityClass) 

public void insert(Object objectToSave)
public void insert(Collection<? extends Object> batchToSave, Class<?> entityClass)
public void insertAll(Collection<? extends Object> objectsToSave)

public void save(Object objectToSave)

public WriteResult upsert(Query query, Update update, Class<?> entityClass)
public WriteResult updateFirst(Query query, Update update, Class<?> entityClass)
public WriteResult updateMulti(Query query, Update update, Class<?> entityClass)

public WriteResult remove(Object object)
public WriteResult remove(Query query, String collectionName)

public <T> List<T> findAll(Class<T> entityClass)
public <T> List<T> findAllAndRemove(Query query, Class<T> entityClass) 

public DB getDb()
public String getCollectionName(Class<?> entityClass)

public <T> MapReduceResults<T> mapReduce(String inputCollectionName, String mapFunction, String reduceFunction, Class<T> entityClass)
public <T> MapReduceResults<T> mapReduce(String inputCollectionName, String mapFunction, String reduceFunction,MapReduceOptions mapReduceOptions, Class<T> entityClass) 

public <T> GroupByResults<T> group(String inputCollectionName, GroupBy groupBy, Class<T> entityClass)

public <O> AggregationResults<O> aggregate(TypedAggregation<?> aggregation, Class<O> outputType)
public <O> AggregationResults<O> aggregate(Aggregation aggregation, Class<?> inputType, Class<O> outputType)

注解式查询：

1 一个方法名查询中同一个属性不能出现2次  可以创意@Query方法查询
2 @Query：
     value  查询语句
     count  作为统计的查询 返回int值
     delete 作为删除语句并返回删除后的文档集合
     fields 返回哪些字段

  示例：
    @Query(count = true, value = "{'$and':[{'tenant':?3},{'reportStatus':?0}," +
            " {'dealTime':{'$gte':?1}}, {'dealTime':{'$lte':?2}}]}")
    int countByStatusAndDealTimeBetween
            (ReportStatus status, Date begin, Date end, long tenant);

Sort：

private final List<Order> orders;

public Sort and(Sort sort) {

        if (sort == null) {
            return this;
        }

        ArrayList<Order> these = new ArrayList<Order>(this.orders);

        for (Order order : sort) {
            these.add(order);
        }

        return new Sort(these);
    }

Query:

private Sort sort;
    private int skip;
    private int limit;

    public Query skip(int skip) {
        this.skip = skip;
        return this;
    }

    public Query limit(int limit) {
        this.limit = limit;
        return this;
    }

        public Query with(Pageable pageable) {

        if (pageable == null) {
            return this;
        }

        this.limit = pageable.getPageSize();
        this.skip = pageable.getOffset();

        return with(pageable.getSort());
    }

    public Query with(Sort sort) {

        if (sort == null) {
            return this;
        }

        for (Order order : sort) {
            if (order.isIgnoreCase()) {
                throw new IllegalArgumentException(String.format("Gven sort contained an Order for %s with ignore case! "
                        + "MongoDB does not support sorting ignoreing case currently!", order.getProperty()));
            }
        }

        if (this.sort == null) {
            this.sort = sort;
        } else {
            this.sort = this.sort.and(sort);
        }

        return this;
    }

private final Map<String, CriteriaDefinition> criteria = new LinkedHashMap<String, CriteriaDefinition>();

    public static Query query(CriteriaDefinition criteriaDefinition) {
        return new Query(criteriaDefinition);
    }

    public Query() {}

    public Query(CriteriaDefinition criteriaDefinition) {
        addCriteria(criteriaDefinition);
    }

    public Query addCriteria(CriteriaDefinition criteriaDefinition) {

        CriteriaDefinition existing = this.criteria.get(criteriaDefinition.getKey());
        String key = criteriaDefinition.getKey();

        if (existing == null) {
            this.criteria.put(key, criteriaDefinition);
        } else {
            throw new InvalidMongoDbApiUsageException("Due to limitations of the com.mongodb.BasicDBObject, "
                    + "you can't add a second '" + key + "' criteria. " + "Query already contains '"
                    + existing.getCriteriaObject() + "'.");
        }

        return this;
    }

Criteria：

private String key;
    private List<Criteria> criteriaChain;
    private LinkedHashMap<String, Object> criteria = new LinkedHashMap<String, Object>();
    private Object isValue = NOT_SET;

        public static Criteria where(String key) {
        return new Criteria(key);
    }

    /**
     * Static factory method to create a Criteria using the provided key
     *
     * @return
     */
    public Criteria and(String key) {
        return new Criteria(this.criteriaChain, key);
    }

andOperator

is ne lt lte gt gte in nin mod all size exits type not regex

聚合：

/**
         * db.videos.aggregate(
            [
               { $match: { "frags.isnew" : true } },
               { $unwind: "$frags" },
               { $match: { "frags.isnew" : true } },
               { $group: {
                           _id: {cat1:"$cat1"},
                           count: { $sum: 1 },
                           publishdate2: { $max: "$publishdate"}
                         }
               } 

            ]
            )
         */
        Aggregation agg = newAggregation(
                project("frags","cat1","publishdate"),//挑选所需的字段
                match(
                        Criteria.where("frags.isnew").is(Boolean.TRUE)
                        .and("cat1").in(importantCat1List)
                     ),//筛选符合条件的记录
                unwind("frags"),//如果有MASTER-ITEM关系的表，需同时JOIN这两张表的，展开子项LIST，且是内链接，即如果父和子的关联ID没有的就不会输出
                match(Criteria.where("frags.isnew").is(Boolean.TRUE)),
                group("cat1")//设置分组字段
                    .count().as("updateCount")//增加COUNT为分组后输出的字段
                    .last("publishdate").as("publishDate"),//增加publishDate为分组后输出的字段
                project("publishDate","cat1","updateCount")//重新挑选字段
                    .and("cat1").previousOperation()//为前一操作所产生的ID FIELD建立别名
            ); 

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版权声明：本文为CSDN博主「weihainan」的原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/u010084868/article/details/52625819