Couchbase学习笔记（4）——Document应用
既然Couchbase是基于文档类型的No SQL，那就不得不说说这个东东~
看看Document类：
public class Document<T> : IDocument<T>
{
/// <summary>
/// The unique identifier for the document
/// </summary>
public string Id { get; set; }
/// <summary>
/// The "Check and Set" value for enforcing optimistic concurrency
/// </summary>
public ulong Cas { get; set; }
/// <summary>
/// The time-to-live or TTL for the document before it's evicated from disk
/// </summary>
/// <remarks>Setting this to zero or less will give the document infinite lifetime</remarks>
public uint Expiry { get; set; }
/// <summary>
/// The value representing the document itself
/// </summary>
public T Content { get; set; }
}
1、存取基本类型信息
在HomeController的 Index 方法里边，添加如下代码：
public ActionResult Index()
{
ClusterHelper.Initialize();
var cluster = ClusterHelper.Get();
using (var bucket = cluster.OpenBucket("default"))
{
var doc = new Document<string>() { Id = "WW", Content = "我是中国人！" };
bucket.Insert(doc);
var docResult = bucket.GetDocument<string>("WW");
ViewBag.InsertDoc = docResult.Content;
}
return View();
}
此处存取的是string类型的信息，也可以存取其他基本类型，显示在页面如下：
2、存取对象类型信息
在HomeController的 Index 方法里边，添加如下代码：
public ActionResult Index()
{
ClusterHelper.Initialize();
var cluster = ClusterHelper.Get();
using (var bucket = cluster.OpenBucket("default"))
{
var testChild = new Child() { FirstName = "张三", Age = "20", Gender = "男" };
var doc2 = new Document<Child>()
{
Id = "ww2015",
Content = testChild
};
var result = bucket.Insert(doc2);
if (result.Success)
{
var docResult2 = bucket.GetDocument<Child>(doc2.Id);
ViewBag.InsertDoc2 = docResult2.Content.FirstName + "_" + docResult2.Content.Gender + "_" + docResult2.Content.Age;
}
}
return View();
}
此处存取的是对象类型的Child信息，显示在页面如下：
3、存取列表类型信息
在HomeController的 Index 方法里边，添加如下代码：
public ActionResult Index()
{
ClusterHelper.Initialize();
var cluster = ClusterHelper.Get();
using (var bucket = cluster.OpenBucket("default"))
{
var childList = new List<Child>() { new Child() { FirstName = "张三", Age = "20", Gender = "男" }, new Child() { FirstName = "李四", Age = "25", Gender = "女" } };
var doc3 = new Document<List<Child>>()
{
Id = "childlist",
Content = childList
};
bucket.Insert(doc3);
var docResult3 = bucket.GetDocument<List<Child>>("childlist");
var strResult = "";
docResult3.Content.ForEach(s =>
{
strResult += s.FirstName + "_" + s.Gender + "_" + s.Age + " ";
});
ViewBag.InsertDoc3 = strResult;
}
return View();
}
此处存取的是List类型的Child信息，显示在页面如下：
注意：
1、这里不用手工序列化
2、这里存的是Json
4、更新文档
更新文档：
（1）Replace()方法替换已存在文档，如果不存在则失败
（2）Upsert() 方法替换已存在文档，不存在则创建
var person = document.Content;
person.FirstName = "Tom";
person.LastName = "Finnigan";
if (bucket.Replace(document).Success)
{
var result = bucket.GetDocument<Person>("P1");
if (result.Success)
{
person = result.Content;
Console.WriteLine("Replaced document '{0}': {1} {2}",
document.Id, person.FirstName, person.LastName);
}
}
5、删除文档
var result = bucket.Remove(document);
if(result.Success)
{
Console.WriteLine("Deleted document '{0}'", document.Id);
}
6、批量操作文档
（1）Upsert（）方法
using (var bucket = _cluster.OpenBucket())
{
var items = new Dictionary<string, dynamic>
{
{"CouchbaseBucketTests.Test_Multi_Upsert.String", "string"},
{"CouchbaseBucketTests.Test_Multi_Upsert.Json", new {Foo = "Bar", Baz = 2}},
{"CouchbaseBucketTests.Test_Multi_Upsert.Int", 2},
{"CouchbaseBucketTests.Test_Multi_Upsert.Number", 5.8},
{"CouchbaseBucketTests.Test_Multi_Upsert.Binary", new[] {0x00, 0x00}}
};
var multiUpsert = bucket.Upsert(items);
foreach (var item in multiUpsert)
{
Assert.IsTrue(item.Value.Success);
}
}
这里实际上用的是Dictionary集合
（2）Get（）方法
using (var bucket = _cluster.OpenBucket())
{
var items = new List<string>
{
"CouchbaseBucketTests.Test_Multi_Upsert.String",
"CouchbaseBucketTests.Test_Multi_Upsert.Json",
"CouchbaseBucketTests.Test_Multi_Upsert.Int",
"CouchbaseBucketTests.Test_Multi_Upsert.Number",
"CouchbaseBucketTests.Test_Multi_Upsert.Binary"
};
var multiGet = bucket.Get<dynamic>(items);
foreach (var item in multiGet)
{
Assert.IsTrue(item.Value.Success);
}
}
可以获取以上所有key的值
注：上面两个方法还有很多重载操作，具体参考相关文档！
7、原子操作
用于原子操作的方法：
| Name | Description |
|---|---|
| Increment | Increments the value of a key by a given delta |
| Decrement | Decrements the value of a key by a given delta |
| Append | Appends to the back of the value of a given key |
| Prepend |
static Cluster _cluster = new Cluster();
static void Main(string[] args)
{
using (var bucket = _cluster.OpenBucket())
{
var key = "stats::counter1";
Increment(bucket, key);
Increment(bucket, key);
Decrement(bucket, key);
Decrement(bucket, key);
Decrement(bucket, key);
}
_cluster.Dispose();
Console.Read();
}
static void Increment(IBucket bucket, string key)
{
var result = bucket.Increment(key);
if (result.Success)
{
Console.WriteLine(result.Content);
}
}
static void Decrement(IBucket bucket, string key)
{
var result = bucket.Decrement(key);
if (result.Success)
{
Console.WriteLine(result.Content);
}
}
最后，更为详细的用法参见Couchbase官网.NET SDK 的API页面
