EFcore 解决 SQLite 没有datetime 类型的问题
2021/5/8 19:25:48
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EFcore 解决 SQLite 没有datetime 类型的问题
SQLite不支持EFcore 的DateTime类型,请参阅
SQLite does not have proper support for DateTimeOffset via Entity Framework Core, see the limitations
解决办法
https://gist.github.com/GeorgDangl/b90370124720ed8fed9539509aafd155#file-datetimeoffsetticksubtraction-cs
DatabaseContext.cs
protected override void OnModelCreating(ModelBuilder builder) { base.OnModelCreating(builder); builder.ApplyConfigurationsFromAssembly(Assembly.GetExecutingAssembly()); if (Database.ProviderName == "Microsoft.EntityFrameworkCore.Sqlite") { // SQLite does not have proper support for DateTimeOffset via Entity Framework Core, see the limitations // here: https://docs.microsoft.com/en-us/ef/core/providers/sqlite/limitations#query-limitations // To work around this, when the Sqlite database provider is used, all model properties of type DateTimeOffset // use the DateTimeOffsetToBinaryConverter // Based on: https://github.com/aspnet/EntityFrameworkCore/issues/10784#issuecomment-415769754 // This only supports millisecond precision, but should be sufficient for most use cases. foreach (var entityType in builder.Model.GetEntityTypes()) { var properties = entityType.ClrType.GetProperties().Where(p => p.PropertyType == typeof(DateTime) || p.PropertyType == typeof(DateTime?)); foreach (var property in properties) { builder .Entity(entityType.Name) .Property(property.Name) .HasConversion(new DateTimeToTimeStampConverter()); } } } }
DateTimeToTimeStampConverter
public class DateTimeToTimeStampConverter : ValueConverter<DateTime, long> { public DateTimeToTimeStampConverter(ConverterMappingHints mappingHints = null) : base( v => (long)TimeStampHelper.ConvertJavaTimeStamp(v), v => TimeStampHelper.JavaTimeStampToDateTime(v), mappingHints) { } }
TimeStampHelper
public class TimeStampHelper { public static double ConvertUnixTimeStamp(DateTime time) { //create Timespan by subtracting the value provided from //the Unix Epoch TimeSpan span = (time - new DateTime(1970, 1, 1, 0, 0, 0, 0).ToLocalTime()); //return the total seconds (which is a UNIX timestamp) return (double)span.TotalSeconds; } public static DateTime UnixTimeStampToDateTime(double unixTimeStamp) { // Unix timestamp is seconds past epoch System.DateTime dtDateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0, System.DateTimeKind.Utc); dtDateTime = dtDateTime.AddSeconds(unixTimeStamp).ToLocalTime(); return dtDateTime; } public static double ConvertJavaTimeStamp(DateTime time) { //create Timespan by subtracting the value provided from //the Unix Epoch TimeSpan span = (time - new DateTime(1970, 1, 1, 0, 0, 0, 0).ToLocalTime()); //return the total Milliseconds (which is a Java timestamp) return (double)span.TotalMilliseconds; } public static DateTime JavaTimeStampToDateTime(double javaTimeStamp) { // Java timestamp is milliseconds past epoch System.DateTime dtDateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0, System.DateTimeKind.Utc); dtDateTime = dtDateTime.AddMilliseconds(javaTimeStamp).ToLocalTime(); return dtDateTime; } }
问题解决!
参考
https://github.com/dotnet/efcore/issues/9071
https://gist.github.com/GeorgDangl/b90370124720ed8fed9539509aafd155#file-datetimeoffsetticksubtraction-cs
https://github.com/dotnet/efcore/tree/main/src/EFCore/Storage/ValueConversion
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