public void ConversionToTsVector()
{
using (var context = new BloggingContext(ConnectionString))
{
context.Database.Log = Console.Out.WriteLine;
context.Blogs.Add(new Blog {
Name = "_"
});
context.SaveChanges();
const string expected = "'a':5 'b':10";
var casted = context.Blogs.Select(x => NpgsqlTextFunctions.AsTsVector(expected)).First();
Assert.That(
NpgsqlTsVector.Parse(casted).ToString(),
Is.EqualTo(NpgsqlTsVector.Parse(expected).ToString()));
var converted = context.Blogs.Select(x => NpgsqlTextFunctions.ToTsVector("banana car")).First();
Assert.That(
NpgsqlTsVector.Parse(converted).ToString(),
Is.EqualTo(NpgsqlTsVector.Parse("'banana':1 'car':2").ToString()));
converted = context.Blogs.Select(x => NpgsqlTextFunctions.ToTsVector("english", "banana car")).First();
Assert.That(
NpgsqlTsVector.Parse(converted).ToString(),
Is.EqualTo(NpgsqlTsVector.Parse("'banana':1 'car':2").ToString()));
}
}
public void Match()
{
using (var context = new BloggingContext(ConnectionString))
{
context.Database.Log = Console.Out.WriteLine;
var blog1 = new Blog
{
Name = "The quick brown fox jumps over the lazy dog."
};
var blog2 = new Blog
{
Name = "Jackdaws loves my big sphinx of quartz."
};
context.Blogs.Add(blog1);
context.Blogs.Add(blog2);
context.SaveChanges();
var foundBlog = context
.Blogs
.FirstOrDefault(
x =>
NpgsqlTextFunctions.Match(
NpgsqlTextFunctions.ToTsVector(x.Name),
NpgsqlTextFunctions.ToTsQuery("jump & dog")));
Assert.That(foundBlog != null);
Assert.That(foundBlog.Name, Is.EqualTo(blog1.Name));
}
}
public void TsRankCd()
{
using (var context = new BloggingContext(ConnectionString))
{
context.Database.Log = Console.Out.WriteLine;
var blog1 = new Blog
{
Name = "cooky cookie piano pianos"
};
context.Blogs.Add(blog1);
context.SaveChanges();
var rank = context
.Blogs
.Select(
x => NpgsqlTextFunctions.TsRankCd(
NpgsqlTextFunctions.ToTsVector(x.Name),
NpgsqlTextFunctions.PlainToTsQuery("cookie")))
.FirstOrDefault();
Assert.That(rank, Is.GreaterThan(0));
rank = context
.Blogs
.Select(
x => NpgsqlTextFunctions.TsRankCd(
NpgsqlTextFunctions.ToTsVector(x.Name),
NpgsqlTextFunctions.PlainToTsQuery("cookie"),
NpgsqlRankingNormalization.DivideByLength
| NpgsqlRankingNormalization.DivideByUniqueWordCount))
.FirstOrDefault();
Assert.That(rank, Is.GreaterThan(0));
rank = context
.Blogs
.Select(
x => NpgsqlTextFunctions.TsRankCd(
0.1f, 0.2f, 0.4f, 1.0f,
NpgsqlTextFunctions.ToTsVector(x.Name),
NpgsqlTextFunctions.PlainToTsQuery("cookie")))
.FirstOrDefault();
Assert.That(rank, Is.GreaterThan(0));
rank = context
.Blogs
.Select(
x => NpgsqlTextFunctions.TsRankCd(
0.1f, 0.2f, 0.4f, 1.0f,
NpgsqlTextFunctions.ToTsVector(x.Name),
NpgsqlTextFunctions.PlainToTsQuery("cookie"),
NpgsqlRankingNormalization.DivideByLength
| NpgsqlRankingNormalization.DivideByUniqueWordCount))
.FirstOrDefault();
Assert.That(rank, Is.GreaterThan(0));
}
}
public void SetWeight()
{
using (var context = new BloggingContext(ConnectionString))
{
context.Database.Log = Console.Out.WriteLine;
var blog1 = new Blog
{
Name = "The quick brown fox jumps over the lazy dog."
};
context.Blogs.Add(blog1);
var post1 = new Post
{
Blog = blog1,
Title = "Lorem ipsum",
Content = "Dolor sit amet",
Rating = 5
};
context.Posts.Add(post1);
var post2 = new Post
{
Blog = blog1,
Title = "consectetur adipiscing elit",
Content = "Sed sed rhoncus",
Rating = 4
};
context.Posts.Add(post2);
context.SaveChanges();
var foundPost = context.Posts.FirstOrDefault(
x => NpgsqlTextFunctions.Match(
NpgsqlTextFunctions.SetWeight(
NpgsqlTextFunctions.ToTsVector(x.Title ?? string.Empty),
NpgsqlWeightLabel.D)
+ NpgsqlTextFunctions.SetWeight(
NpgsqlTextFunctions.ToTsVector(x.Content ?? string.Empty),
NpgsqlWeightLabel.C),
NpgsqlTextFunctions.PlainToTsQuery("dolor")));
Assert.That(foundPost != null);
Assert.That(foundPost.Title, Is.EqualTo(post1.Title));
}
}
public void Length()
{
using (var context = new BloggingContext(ConnectionString))
{
context.Database.Log = Console.Out.WriteLine;
var blog = new Blog
{
Name = "cooky cookie cookies piano pianos"
};
context.Blogs.Add(blog);
context.SaveChanges();
var lexemeCount = context
.Blogs
.Select(x => NpgsqlTextFunctions.Length(NpgsqlTextFunctions.ToTsVector(x.Name)))
.FirstOrDefault();
Assert.That(lexemeCount, Is.EqualTo(2));
}
}
public void Strip()
{
using (var context = new BloggingContext(ConnectionString))
{
context.Database.Log = Console.Out.WriteLine;
var blog = new Blog
{
Name = "cooky cookie cookies piano pianos"
};
context.Blogs.Add(blog);
context.SaveChanges();
var strippedTsVector = context
.Blogs
.Select(x => NpgsqlTextFunctions.Strip(NpgsqlTextFunctions.ToTsVector(x.Name)))
.FirstOrDefault();
Assert.That(
NpgsqlTsVector.Parse(strippedTsVector).ToString(),
Is.EqualTo(NpgsqlTsVector.Parse("'cooki' 'piano'").ToString()));
}
}