FreeSql （四）实体特性 Fluent Api
FreeSql 提供使用 FluentApi， 在外部配置实体的数据库特性，FluentApi 的方法命名与 Attribute 保持一致，如下：
fsql.CodeFirst
.ConfigEntity<TestFluenttb1>(a => {
a.Name("table1");
a.Property(b => b.Id).Name("PkId").IsIdentity(true);
})
.ConfigEntity<TestFluenttb2>(a => {
//...
});
class TestFluenttb1
{
public int Id { get; set; }
public string name { get; set; } = "defaultValue";
}
[Table(Name = "table2")]
class TestFluenttb2
{
public int Id { get; set; }
public string name { get; set; } = "defaultValue";
}
fsql 是一个 IFreeSql 对象
FluentApi 方法命名不优雅，主要考虑到和 Attribute 一致，可以减少理解成本。如果你对 EFCore FluentApi 很熟悉可以使用扩展包：
dotnet add package FreeSql.DbContext
fsql.CodeFirst.Entity<Song>(eb =>
{
eb.ToTable("tb_song");
eb.Ignore(a => a.Field1);
eb.Property(a => a.Title).HasColumnType("varchar(50)").IsRequired();
eb.Property(a => a.Url).HasMaxLength(100);
eb.Property(a => a.RowVersion).IsRowVersion();
eb.Property(a => a.CreateTime).HasDefaultValueSql("getdate()");
eb.HasKey(a => a.Id);
eb.HasIndex(a => a.Title).IsUnique().HasName("idx_xxx11");
//一对多、多对一
eb.HasOne(a => a.Type).HasForeignKey(a => a.TypeId).WithMany(a => a.Songs);
//多对多
eb.HasMany(a => a.Tags).WithMany(a => a.Songs, typeof(Song_tag));
});
fsql.CodeFirst.Entity<SongType>(eb =>
{
eb.HasMany(a => a.Songs).WithOne(a => a.Type).HasForeignKey(a => a.TypeId);
eb.HasData(new[]
{
new SongType
{
Id = 1,
Name = "流行",
Songs = new List<Song>(new[]
{
new Song{ Title = "真的爱你" },
new Song{ Title = "爱你一万年" },
})
},
new SongType
{
Id = 2,
Name = "乡村",
Songs = new List<Song>(new[]
{
new Song{ Title = "乡里乡亲" },
})
},
});
});
public class SongType
{
public int Id { get; set; }
public string Name { get; set; }
public List<Song> Songs { get; set; }
}
public class Song
{
[Column(IsIdentity = true)]
public int Id { get; set; }
public string Title { get; set; }
public string Url { get; set; }
public DateTime CreateTime { get; set; }
public int TypeId { get; set; }
public SongType Type { get; set; }
public List<Tag> Tags { get; set; }
public int Field1 { get; set; }
public long RowVersion { get; set; }
}
public class Song_tag
{
public int Song_id { get; set; }
public Song Song { get; set; }
public int Tag_id { get; set; }
public Tag Tag { get; set; }
}
public class Tag
{
[Column(IsIdentity = true)]
public int Id { get; set; }
public string Name { get; set; }
public List<Song> Songs { get; set; }
}
优先级
FluentApi < 实体特性
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（四）实体特性 Fluent Api
