我想检查是否存在带有特定电子邮件的文档。
我该怎么做?
我想检查是否存在带有特定电子邮件的文档。
我该怎么做?
您可以创建一个以电子邮件为关键字的视图,并在该视图中查询特定的电子邮件地址。哪些值适合视图取决于您将如何处理结果。例如,您可以选择包含电子邮件地址的文档数作为视图的值。
This is a short introduction to views: http://wiki.apache.org/couchdb/Introduction_to_CouchDB_views
CouchDB 2.0.0版本已经提供了一种简单的基于JSON的方法,可以在不使用MapReduce的情况下执行CouchDB查询。更多详细信息请参阅_find、_index和_explain API
以下是视图中map
-函数的想法(_design/foo
):
function (doc) {
if (doc.email) {
emit(doc.email, null);
}
}
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