public void TestSnapshot()
{
var path = CleanTestDB();
using (var db = new LDB(path, new Options {
CreateIfMissing = true
}))
{
db.Set("Tampa", "green");
db.Set("London", "red");
db.Remove("New York");
using (var snapShot = db.CreateSnapshot())
{
var readOptions = new ReadOptions {
Snapshot = snapShot
};
db.Set("New York", "blue");
Assert.Equal((string)db.Get("Tampa", readOptions), "green");
Assert.Equal((string)db.Get("London", readOptions), "red");
// Snapshot taken before key was updates
Assert.Null(db.Get("New York", readOptions));
}
// can see the change now
Assert.Equal((string)db.Get("New York"), "blue");
}
}
public void Intro()
{
using(var database = new LDB(DatabasePath, new Options() { CreateIfMissing = true }))
{
database.Set("key1", "value1");
Assert.Equal("value1", (string)database.Get("key1"));
Assert.True(database.Get("key1") != null);
database.Remove("key1");
Assert.False(database.Get("key1") != null);
Assert.Null(database.Get("key1"));
}
}
public void Intro()
{
using (var database = new LDB(DatabasePath, new Options()
{
CreateIfMissing = true
}))
{
database.Put("key1", "value1");
Assert.Equal("value1", (string)database.Get("key1"));
Assert.True(database.Get("key1") != null);
database.Delete("key1");
Assert.False(database.Get("key1") != null);
Assert.Null(database.Get("key1"));
}
}
/// <summary>
/// get value
/// </summary>
/// <param name="key"></param>
/// <param name="value"></param>
public static string Get(string key)
{
CheckPath();
using (var db = new LDB(path))
{
return(db.Get(key));
}
}
/// <summary>
/// exist value
/// </summary>
/// <param name="key"></param>
public static bool Exists(string key)
{
CheckPath();
using (var db = new LDB(path))
{
return(db.Get(key) != null);
}
}
/// <summary>
/// get value
/// </summary>
/// <param name="key"></param>
/// <param name="value"></param>
public static T Get <T>(string key) where T : class, new()
{
CheckPath();
using (var db = new LDB(path))
{
var item = db.Get(key);
if (item == null)
{
return(new T());
}
else
{
return(db.Get(key).ByteArray.ToModel <T>() ?? new T());
}
}
}
public void TestCRUD()
{
var path = CleanTestDB();
using(var db = new LDB(path, new Options { CreateIfMissing = true }))
{
db.Set("Tampa", "green");
db.Set("London", "red");
db.Set("New York", "blue");
Assert.Equal((string)db.Get("Tampa"), "green");
Assert.Equal((string)db.Get("London"), "red");
Assert.Equal((string)db.Get("New York"), "blue");
db.Remove("New York");
Assert.Null(db.Get("New York"));
db.Remove("New York");
}
}
public void Error()
{
Assert.Throws<LevelDBException>(() =>
{
var options = new Options()
{
CreateIfMissing = false
};
var db = new LDB("non-existent", options);
Assert.True(false);
db.Get("key1");
});
}
public void TestCRUD()
{
var path = CleanTestDB();
using (var db = new LDB(path, new Options {
CreateIfMissing = true
}))
{
db.Set("Tampa", "green");
db.Set("London", "red");
db.Set("New York", "blue");
Assert.Equal((string)db.Get("Tampa"), "green");
Assert.Equal((string)db.Get("London"), "red");
Assert.Equal((string)db.Get("New York"), "blue");
db.Remove("New York");
Assert.Null(db.Get("New York"));
db.Remove("New York");
}
}
public void TestSnapshot()
{
var path = CleanTestDB();
using(var db = new LDB(path, new Options { CreateIfMissing = true }))
{
db.Set("Tampa", "green");
db.Set("London", "red");
db.Remove("New York");
using(var snapShot = db.CreateSnapshot())
{
var readOptions = new ReadOptions { Snapshot = snapShot };
db.Set("New York", "blue");
Assert.Equal((string)db.Get("Tampa", readOptions), "green");
Assert.Equal((string)db.Get("London", readOptions), "red");
// Snapshot taken before key was updates
Assert.Null(db.Get("New York", readOptions));
}
// can see the change now
Assert.Equal((string)db.Get("New York"), "blue");
}
}