protected override Expression VisitFullTextExpression(FullTextExpression expression)
{
var rankExpression = (ColumnExpression)Visit(expression.RankExpression);
var entityExpression = (EntityExpression)Visit(expression.EntityExpression);
if (rankExpression != expression.RankExpression || entityExpression != expression.EntityExpression)
{
return(new FullTextExpression(expression.FullTextIndex, entityExpression, rankExpression, expression.OuterParameter));
}
return(expression);
}
protected override Expression VisitFullTextExpression(FullTextExpression expression)
{
var rankMaterializer = Visit(expression.RankExpression);
var entityMaterializer = Visit(expression.EntityExpression);
var constructorInfo = typeof(FullTextMatch <>)
.MakeGenericType(expression.EntityExpression.Type)
.GetConstructor(BindingFlags.NonPublic | BindingFlags.Instance, new[] { typeof(double), expression.EntityExpression.Type });
return(Expression.New(
constructorInfo,
rankMaterializer,
entityMaterializer));
}
protected override Expression VisitFullTextExpression(FullTextExpression expression)
{
var rankMaterializer = Visit(expression.RankExpression);
var entityMaterializer = Visit(expression.EntityExpression);
var constructorInfo = WellKnownOrmTypes.FullTextMatchOfT
.MakeGenericType(expression.EntityExpression.Type)
.GetConstructor(BindingFlags.NonPublic | BindingFlags.Instance,
new object[] { WellKnownTypes.Double, expression.EntityExpression.Type });
return(Expression.New(
constructorInfo,
rankMaterializer,
entityMaterializer));
}
private static void FullTextSearch()
{
Console.WriteLine("Full text search");
var db = _Database;
// # tag::fts-query[]
var whereClause = FullTextExpression.Index("nameFTSIndex").Match("'buy'");
using (var query = QueryBuilder.Select(SelectResult.Expression(Meta.ID))
.From(DataSource.Database(db))
.Where(whereClause)) {
foreach (var result in query.Execute())
{
Console.WriteLine($"Document id {result.GetString(0)}");
}
}
// # end::fts-query[]
}
private Task <Hotels> FetchHotelsFromLocalAsync(string description, string location)
{
// Description is looked up in the "description" and "name" content
// Location is looking up in country, city, state, and address
// Reference: https://developer.couchbase.com/documentation/server/4.6/sdk/sample-application.html
// MATCH can only appear at top-level, or in a top-level AND
IExpression descExp = null;
if (!String.IsNullOrWhiteSpace(description))
{
descExp = FullTextExpression.Index("description").Match(description);
}
var locationExp = CountryProperty.Like(Expression.String($"%{location}%"))
.Or(CityProperty.Like(Expression.String($"%{location}%")))
.Or(StateProperty.Like(Expression.String($"%{location}%")))
.Or(AddressProperty.Like(Expression.String($"%{location}%")));
var searchExp = locationExp;
if (descExp != null)
{
searchExp = descExp.And(locationExp);
}
using (var hotelSearchQuery = QueryBuilder
.Select(SelectResult.All())
.From(DataSource.Database(UserSession.Database))
.Where(TypeProperty.EqualTo(Expression.String("hotel")).And(searchExp))) {
var results = hotelSearchQuery.Execute().ToList();
var hotels = results.Select(x => x.GetDictionary(0).ToDictionary(y => y.Key, y => y.Value) as Hotel).ToList();
return(Task.FromResult(hotels));
}
}
protected override Expression VisitFullTextExpression(FullTextExpression expression)
{
VisitEntityExpression(expression.EntityExpression);
VisitColumnExpression(expression.RankExpression);
return(expression);
}
static void Main(string[] args)
{
// This only needs to be done once for whatever platform the executable is running
// (UWP, iOS, Android, or desktop)
Couchbase.Lite.Support.NetDesktop.Activate();
// create database
var config = new DatabaseConfiguration();
config.ConflictResolver = new ExampleConflictResolver();
var database = new Database("my-database", config);
// create document
var newTask = new MutableDocument();
newTask.SetString("type", "task");
newTask.SetString("owner", "todo");
newTask.SetDate("createdAt", DateTimeOffset.UtcNow);
newTask = database.Save(newTask).ToMutable();
// mutate document
newTask.SetString("name", "Apples");
newTask = database.Save(newTask).ToMutable();
// typed accessors
newTask.SetDate("createdAt", DateTimeOffset.UtcNow);
var date = newTask.GetDate("createdAt");
// database transaction
database.InBatch(() =>
{
for (int i = 0; i < 10; i++)
{
using (var doc = new MutableDocument()) {
doc.SetString("type", "user");
doc.SetString("name", $"user {i}");
using (var saved = database.Save(doc)) {
Console.WriteLine($"saved user document {saved.GetString("name")}");
}
}
}
});
// blob
var bytes = File.ReadAllBytes("avatar.jpg");
var blob = new Blob("image/jpg", bytes);
newTask.SetBlob("avatar", blob);
newTask = database.Save(newTask).ToMutable();
var taskBlob = newTask.GetBlob("avatar");
var data = taskBlob.Content;
newTask.Dispose();
// query
var query = QueryBuilder.Select(SelectResult.Expression(Meta.ID))
.From(DataSource.Database(database))
.Where(Expression.Property("type").EqualTo(Expression.String("user"))
.And(Expression.Property("admin").EqualTo(Expression.Boolean(false))));
var rows = query.Execute();
foreach (var row in rows)
{
Console.WriteLine($"doc ID :: ${row.GetString(0)}");
}
// live query
query.AddChangeListener((sender, e) => {
Console.WriteLine($"Number of rows :: {e.Results.Count()}");
});
using (var newDoc = new MutableDocument()) {
newDoc.SetString("type", "user");
newDoc.SetBoolean("admin", false);
database.Save(newDoc);
}
// fts example
// insert documents
var tasks = new[] { "buy groceries", "play chess", "book travels", "buy museum tickets" };
foreach (string task in tasks)
{
using (var doc = new MutableDocument()) {
doc.SetString("type", "task").SetString("name", task); // Chaining is possible
database.Save(doc);
}
}
// create Index
var index = IndexBuilder.FullTextIndex(FullTextIndexItem.Property("name"));
database.CreateIndex("byName", index);
using (var ftsQuery = QueryBuilder.Select(SelectResult.Expression(Meta.ID).As("id"))
.From(DataSource.Database(database))
.Where(FullTextExpression.Index("byName").Match("'buy'"))) {
var ftsRows = ftsQuery.Execute();
foreach (var row in ftsRows)
{
var doc = database.GetDocument(row.GetString("id")); // Use alias instead of index
Console.WriteLine(
$"document properties {JsonConvert.SerializeObject(doc.ToDictionary(), Formatting.Indented)}");
}
}
// create conflict
/*
* 1. Create a document twice with the same ID (the document will have two conflicting revisions).
* 2. Upon saving the second revision, the ExampleConflictResolver's resolve method is called.
* The `theirs` ReadOnlyDocument in the conflict resolver represents the current rev and `mine` is what's being saved.
* 3. Read the document after the second save operation and verify its property is as expected.
* The conflict resolver will have deleted the obsolete revision.
*/
using (var theirs = new MutableDocument("buzz"))
using (var mine = new MutableDocument("buzz")) {
theirs.SetString("status", "theirs");
mine.SetString("status", "mine");
database.Save(theirs);
database.Save(mine);
}
var conflictResolverResult = database.GetDocument("buzz");
Console.WriteLine($"conflictResolverResult doc.status ::: {conflictResolverResult.GetString("status")}");
// replication (Note: Linux / Mac requires .NET Core 2.0+ due to
// https://github.com/dotnet/corefx/issues/8768)
/*
* Tested with SG 1.5 https://www.couchbase.com/downloads
* Config file:
* {
* "databases": {
* "db": {
* "server":"walrus:",
* "users": {
* "GUEST": {"disabled": false, "admin_channels": ["*"]}
* },
* "unsupported": {
* "replicator_2":true
* }
* }
* }
* }
*/
var url = new Uri("ws://localhost:4984/db");
var replConfig = new ReplicatorConfiguration(database, new URLEndpoint(url));
var replication = new Replicator(replConfig);
replication.Start();
// replication change listener
replication.AddChangeListener((sender, e) => {
if (e.Status.Activity == ReplicatorActivityLevel.Stopped)
{
Console.WriteLine("Replication has completed.");
}
});
Console.ReadLine();
// This is important to do because otherwise the native connection
// won't be released until the next garbage collection
query.Dispose();
database.Dispose();
}
protected virtual Expression VisitFullTextExpression(FullTextExpression expression)
{
return(expression);
}
