我正在尝试使用Entity Framework 6将一些带有特殊字符的字符串insert放入数据库,但似乎EF在放入数据库时会对其进行更改。例如,“zażółćgęśląjaźń”变成“zazólcgesla jazn”。
我想保持数据不变,而将列保持为varchar。
创建数据库后,我尝试了一些注释并执行了更改排序规则和字符集的命令,但是这些尝试均失败了。
using System.ComponentModel.DataAnnotations.Schema;
using Microsoft.EntityFrameworkCore;
using MySql.Data.EntityFrameworkCore.DataAnnotations;
class Program
{
static void Main(string[] args)
{
using (var context = new TestDBContext())
{
context.Database.EnsureDeleted();
context.Database.EnsureCreated();
// tried this
context.Database.ExecuteSqlCommand(
"ALTER DATABASE `TestDB` DEFAULT CHARACTER SET utf8 DEFAULT COLLATE utf8_unicode_ci");
context.insertData();
// result: "lódz" - doesn't work either
context.Database.ExecuteSqlCommand(
"INSERT INTO `testtable` (`Id`, `SpecialCharacters`) VALUES (NULL, 'łódź')");
}
}
}
class TestDBContext : DbContext
{
public Microsoft.EntityFrameworkCore.DbSet<TestTable> TestTable { get; set; }
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
optionsBuilder.UseMySQL("server=localhost;database=TestDB;user=root;password=;SslMode=None;");
}
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
modelBuilder.Entity<TestTable>()
.HasKey(t => t.Id);
}
// result: "zazólc gesla jazn" instead of "zażółć gęślą jaźń"
public void insertData()
{
using (var context = new TestDBContext())
{
context.TestTable.Add(new TestTable
{
SpecialCharacters = "zażółć gęślą jaźń",
}
);
context.SaveChanges();
}
}
}
class TestTable
{
public int Id { get; set; }
[Column(TypeName = "varchar(17)")]
[MySqlCharset("utf8")] // tried this
[MySqlCollation("utf8_unicode_ci")] // tried this
public string SpecialCharacters { get; set; }
}
(注意context.Database.ExecuteSqlCommand("INSERT INTO...
也违反了数据。通过控制台(不带EF)添加此类数据就可以了。)
最后,我的问题是:如何使用Entity Framework将具有特殊字符的字符串插入DB的varchar列中?