MongoDB是一个流行的文档型数据库，Spring Data MongoDB则是Spring Framework的一个子项目，提供了对MongoDB的集成支持。其中，MongoTemplate是Spring Data MongoDB提供的一个核心类，用于操作MongoDB数据库。
下面是MongoTemplate的用法大全：
1.添加文档
```java
public void insert(Object objectToSave);
public void insert(Object objectToSave, String collectionName);
public void insert(Collection<? extends Object> batchToSave, Class<?> entityClass);
public void insert(Collection<? extends Object> batchToSave, String collectionName);
```
2.修改文档
```java
public void save(Object objectToSave);
public void save(Object objectToSave, String collectionName);
public void save(Collection<? extends Object> objectsToSave, Class<?> entityClass);
public void save(Collection<? extends Object> objectsToSave, String collectionName);
public void updateFirst(Query query, Update update, Class<?> entityClass);
public void updateFirst(Query query, Update update, String collectionName);
public void updateMulti(Query query, Update update, Class<?> entityClass);
public void updateMulti(Query query, Update update, String collectionName);
public void upsert(Query query, Update update, Class<?> entityClass);
public void upsert(Query query, Update update, String collectionName);
```
3.删除文档
```java
public void remove(Object object);
public void remove(Object object, String collectionName);
public void remove(Query query, Class<?> entityClass);
public void remove(Query query, String collectionName);
public void removeAll(Class<?> entityClass);
public void removeAll(String collectionName);
```
4.查询文档
```java
public <T> List<T> findAll(Class<T> entityClass);
public <T> List<T> findAll(String collectionName, Class<T> entityClass);
public <T> T findById(Object id, Class<T> entityClass);
public <T> T findOne(Query query, Class<T> entityClass);
public <T> T findOne(Query query, Class<T> entityClass, String collectionName);
public <T> List<T> find(Query query, Class<T> entityClass);
public <T> List<T> find(Query query, Class<T> entityClass, String collectionName);
public <T> List<T> findDistinct(Query query, String field, Class<?> entityClass, Class<T> resultClass);
public <T> List<T> mapReduce(MapReduceOptions options, Class<?> entityClass, Class<T> resultClass);
public <T> List<T> geoNear(NearQuery near, Class<?> entityClass);
public <T> List<T> geoNear(NearQuery near, Class<?> entityClass, String collectionName);
public <T> List<T> aggregate(TypedAggregation<?> aggregation, Class<T> resultClass);
public <T> List<T> aggregate(Aggregation aggregation, String collectionName, Class<T> resultClass);
public <T> List<T> findAndModify(Query query, Update update, Class<T> entityClass);
public <T> List<T> findAndModify(Query query, Update update, Class<T> entityClass, String collectionName);
public <T> List<T> findAndRemove(Query query, Class<T> entityClass);
public <T> List<T> findAndRemove(Query query, Class<T> entityClass, String collectionName);
```
5.其他操作
```java
public <T> List<T> findDistinct(Query query, String field, Class<?> entityClass, Class<T> resultClass);
public <T> List<T> mapReduce(MapReduceOptions options, Class<?> entityClass, Class<T> resultClass);
public <T> List<T> geoNear(NearQuery near, Class<?> entityClass);
public <T> List<T> geoNear(NearQuery near, Class<?> entityClass, String collectionName);
public <T> List<T> aggregate(TypedAggregation<?> aggregation, Class<T> resultClass);
public <T> List<T> aggregate(Aggregation aggregation, String collectionName, Class<T> resultClass);
public <T> List<T> findAndModify(Query query, Update update, Class<T> entityClass);
public <T> List<T> findAndModify(Query query, Update update, Class<T> entityClass, String collectionName);
public <T> List<T> findAndRemove(Query query, Class<T> entityClass);
public <T> List<T> findAndRemove(Query query, Class<T> entityClass, String collectionName);
```
以上是MongoTemplate的用法大全，涵盖了MongoDB的基本操作。当然，还有其他更高级的用法需要深入学习。
MongoDB基本用法大全
本文详细介绍了如何在MongoDB中添加用户名密码等基本操作，涵盖了数据库管理的基础知识。
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