3.1 CRUD 操作概述

CRUD 操作以方法的形式提供，这些方法对 Schema 对象进行操作。可用的 Schema 对象包括包含文档的 Collection 对象，或包含行和包含文档的 Collection 对象的 Table 对象。

下表显示了 Collection 和 Table 对象的可用 CRUD 操作。

操作

文档

关系型

创建

第 4.3.1 节，“Collection.add()”

Table.insert()

读取

第 4.3.2 节，“Collection.find()”

Table.select()

更新

第 4.3.3 节，“Collection.modify()”

Table.update()

删除

第 4.3.4 节，“Collection.remove()”

Table.delete()

数据库对象类

图 3.1 数据库对象 - 类图

The DatabaseObject class contains the following general functions: getSession(): XSessionObj, getSchema(): SchemaObj, getName(): String, existsInDatabase(): Boolean|Unknown. The Schema class contains the following functions: getCollections() and getTables() are browse functions. getCollection(): CollectionObj, getTable(): TableObj, and getCollectionAsTable(): TableObj are DbObject instance functions. createCollection() is a create function. The Collection class contains the following functions: add(): CollectionInsertObj, find(): CollectionFindObj, modify(): CollectionUpdateObj, and remove(): CollectionDeleteObj are CRUD functions. createIndex(), dropIndex(), and getIndexes() are index functions. newDoc() and count(): Integer are document and structure functions. The Table class contains the following functions: insert(): InsertObj, select(): SelectObj, update(): UpdateObj, and delete(): DeleteObj are relational SQL CRUD functions. dropIndex() and getIndexes() are index functions. count(): Integer is a general function.


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