本文整理汇总了C#中Mapper.UpdateIf方法的典型用法代码示例。如果您正苦于以下问题：C# Mapper.UpdateIf方法的具体用法？C# Mapper.UpdateIf怎么用？C# Mapper.UpdateIf使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Mapper的用法示例。
在下文中一共展示了Mapper.UpdateIf方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: UpdateIf_Applied_Test
public void UpdateIf_Applied_Test()
{
var config = new MappingConfiguration()
.Define(new Map<Song>().PartitionKey(s => s.Id).TableName("song_update_if"));
//Use linq to create the table
new Table<Song>(_session, config).Create();
var mapper = new Mapper(_session, config);
var song = new Song { Id = Guid.NewGuid(), Artist = "Cream", Title = "Crossroad", ReleaseDate = DateTimeOffset.Parse("1970/1/1")};
//It is the first song there, it should apply it
mapper.Insert(song);
const string query = "SET artist = ?, title = ? WHERE id = ? IF releasedate = ?";
var appliedInfo = mapper.UpdateIf<Song>(Cql.New(query, song.Artist, "Crossroad2", song.Id, song.ReleaseDate));
Assert.True(appliedInfo.Applied);
Assert.Null(appliedInfo.Existing);
//Following times, it should not apply the mutation as the condition is not valid
appliedInfo = mapper.UpdateIf<Song>(Cql.New(query, song.Artist, "Crossroad3", song.Id, DateTimeOffset.Now));
Assert.False(appliedInfo.Applied);
Assert.NotNull(appliedInfo.Existing);
Assert.AreEqual(song.ReleaseDate, appliedInfo.Existing.ReleaseDate);
Assert.AreEqual("Crossroad2", mapper.First<Song>("WHERE id = ?", song.Id).Title);
}