tk/FreeSql
1
0
Fork 0
mirror of https://github.com/nsnail/FreeSql.git synced 2025-04-22 10:42:52 +08:00
Code Issues Packages Projects Releases Wiki Activity

- 修复 ToTreeList 的问题 #255

Browse Source
This commit is contained in:
28810 2020-03-27 18:41:11 +08:00
parent f9c1003e81
commit dc625218d6
15 changed files with 509 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
FreeSql.DbContext/FreeSql.DbContext.xml
View File

@ -211,15 +211,6 @@
</summary> </summary>
<returns></returns> <returns></returns>
</member> </member>
<member name="M:FreeSql.FreeSqlRepositoryDependencyInjection.AddFreeRepository(Microsoft.Extensions.DependencyInjection.IServiceCollection,System.Action{FreeSql.FluentDataFilter},System.Reflection.Assembly[])">
<summary>
批量注入 Repository，可以参考代码自行调整
</summary>
<param name="services"></param>
<param name="globalDataFilter"></param>
<param name="assemblies"></param>
<returns></returns>
</member>
<member name="M:FreeSql.IBaseRepository.AsType(System.Type)"> <member name="M:FreeSql.IBaseRepository.AsType(System.Type)">
<summary> <summary>
动态Type，在使用 Repository&lt;object&gt; 后使用本方法，指定实体类型 动态Type，在使用 Repository&lt;object&gt; 后使用本方法，指定实体类型

39
FreeSql.Tests/FreeSql.Tests.Provider.MySqlConnector/MySqlConnector/Curd/MySqlSelectTest.cs
View File

@ -250,6 +250,45 @@ namespace FreeSql.Tests.MySqlConnector
var t11 = select.Where(a => a.Type.Name.Length > 0).ToList(true); var t11 = select.Where(a => a.Type.Name.Length > 0).ToList(true);
var t21 = select.Where(a => a.Type.Parent.Name.Length > 0).ToList(true); var t21 = select.Where(a => a.Type.Parent.Name.Length > 0).ToList(true);
g.mysql.Delete<District>().Where("1=1").ExecuteAffrows();
var repo = g.mysql.GetRepository<District>();
repo.DbContextOptions.EnableAddOrUpdateNavigateList = true;
repo.Insert(new District
{
Code = "001",
Name = "001_name",
Childs = new List<District>(new[] {
new District{
Code = "001_01",
Name = "001_01_name"
},
new District{
Code = "001_02",
Name = "001_02_name"
}
})
});
var ddd = g.mysql.Select<District>().LeftJoin(d => d.ParentCode == d.Parent.Code).ToTreeList();
Assert.Equal(1, ddd.Count);
Assert.Equal(2, ddd[0].Childs.Count);
}
public class District
{
[Column(IsPrimary = true, StringLength = 6)]
public string Code { get; set; }
[Column(StringLength = 20, IsNullable = false)]
public string Name { get; set; }
[Column(StringLength = 6)]
public string ParentCode { get; set; }
[Navigate(nameof(ParentCode))]
public District Parent { get; set; }
[Navigate(nameof(ParentCode))]
public List<District> Childs { get; set; }
} }
[Fact] [Fact]
public void ToDictionary() public void ToDictionary()

39
FreeSql.Tests/FreeSql.Tests.Provider.Odbc/Dameng/Curd/DamengSelectTest.cs
View File

@ -191,6 +191,45 @@ namespace FreeSql.Tests.Odbc.Dameng
var t11 = select.Where(a => a.Type.Name.Length > 0).ToList(true); var t11 = select.Where(a => a.Type.Name.Length > 0).ToList(true);
var t21 = select.Where(a => a.Type.Parent.Name.Length > 0).ToList(true); var t21 = select.Where(a => a.Type.Parent.Name.Length > 0).ToList(true);
g.dameng.Delete<District>().Where("1=1").ExecuteAffrows();
var repo = g.dameng.GetRepository<District>();
repo.DbContextOptions.EnableAddOrUpdateNavigateList = true;
repo.Insert(new District
{
Code = "001",
Name = "001_name",
Childs = new List<District>(new[] {
new District{
Code = "001_01",
Name = "001_01_name"
},
new District{
Code = "001_02",
Name = "001_02_name"
}
})
});
var ddd = g.dameng.Select<District>().LeftJoin(d => d.ParentCode == d.Parent.Code).ToTreeList();
Assert.Equal(1, ddd.Count);
Assert.Equal(2, ddd[0].Childs.Count);
}
public class District
{
[Column(IsPrimary = true, StringLength = 6)]
public string Code { get; set; }
[Column(StringLength = 20, IsNullable = false)]
public string Name { get; set; }
[Column(StringLength = 6)]
public string ParentCode { get; set; }
[Navigate(nameof(ParentCode))]
public District Parent { get; set; }
[Navigate(nameof(ParentCode))]
public List<District> Childs { get; set; }
} }
[Fact] [Fact]
public void ToDictionary() public void ToDictionary()

39
FreeSql.Tests/FreeSql.Tests.Provider.Odbc/Default/Curd/OdbcSelectTest.cs
View File

@ -182,6 +182,45 @@ namespace FreeSql.Tests.Odbc.Default
var t11 = select.Where(a => a.Type.Name.Length > 0).ToList(true); var t11 = select.Where(a => a.Type.Name.Length > 0).ToList(true);
var t21 = select.Where(a => a.Type.Parent.Name.Length > 0).ToList(true); var t21 = select.Where(a => a.Type.Parent.Name.Length > 0).ToList(true);
g.odbc.Delete<District>().Where("1=1").ExecuteAffrows();
var repo = g.odbc.GetRepository<District>();
repo.DbContextOptions.EnableAddOrUpdateNavigateList = true;
repo.Insert(new District
{
Code = "001",
Name = "001_name",
Childs = new List<District>(new[] {
new District{
Code = "001_01",
Name = "001_01_name"
},
new District{
Code = "001_02",
Name = "001_02_name"
}
})
});
var ddd = g.odbc.Select<District>().LeftJoin(d => d.ParentCode == d.Parent.Code).ToTreeList();
Assert.Equal(1, ddd.Count);
Assert.Equal(2, ddd[0].Childs.Count);
}
public class District
{
[Column(IsPrimary = true, StringLength = 6)]
public string Code { get; set; }
[Column(StringLength = 20, IsNullable = false)]
public string Name { get; set; }
[Column(StringLength = 6)]
public string ParentCode { get; set; }
[Navigate(nameof(ParentCode))]
public District Parent { get; set; }
[Navigate(nameof(ParentCode))]
public List<District> Childs { get; set; }
} }
[Fact] [Fact]
public void ToDictionary() public void ToDictionary()

39
FreeSql.Tests/FreeSql.Tests.Provider.Odbc/MySql/Curd/MySqlSelectTest.cs
View File

@ -291,6 +291,45 @@ namespace FreeSql.Tests.Odbc.MySql
var t11 = select.Where(a => a.Type.Name.Length > 0).ToList(true); var t11 = select.Where(a => a.Type.Name.Length > 0).ToList(true);
var t21 = select.Where(a => a.Type.Parent.Name.Length > 0).ToList(true); var t21 = select.Where(a => a.Type.Parent.Name.Length > 0).ToList(true);
g.mysql.Delete<District>().Where("1=1").ExecuteAffrows();
var repo = g.mysql.GetRepository<District>();
repo.DbContextOptions.EnableAddOrUpdateNavigateList = true;
repo.Insert(new District
{
Code = "001",
Name = "001_name",
Childs = new List<District>(new[] {
new District{
Code = "001_01",
Name = "001_01_name"
},
new District{
Code = "001_02",
Name = "001_02_name"
}
})
});
var ddd = g.mysql.Select<District>().LeftJoin(d => d.ParentCode == d.Parent.Code).ToTreeList();
Assert.Equal(1, ddd.Count);
Assert.Equal(2, ddd[0].Childs.Count);
}
public class District
{
[Column(IsPrimary = true, StringLength = 6)]
public string Code { get; set; }
[Column(StringLength = 20, IsNullable = false)]
public string Name { get; set; }
[Column(StringLength = 6)]
public string ParentCode { get; set; }
[Navigate(nameof(ParentCode))]
public District Parent { get; set; }
[Navigate(nameof(ParentCode))]
public List<District> Childs { get; set; }
} }
[Fact] [Fact]
public void ToDictionary() public void ToDictionary()

39
FreeSql.Tests/FreeSql.Tests.Provider.Odbc/Oracle/Curd/OracleSelectTest.cs
View File

@ -191,6 +191,45 @@ namespace FreeSql.Tests.Odbc.Oracle
var t11 = select.Where(a => a.Type.Name.Length > 0).ToList(true); var t11 = select.Where(a => a.Type.Name.Length > 0).ToList(true);
var t21 = select.Where(a => a.Type.Parent.Name.Length > 0).ToList(true); var t21 = select.Where(a => a.Type.Parent.Name.Length > 0).ToList(true);
g.oracle.Delete<District>().Where("1=1").ExecuteAffrows();
var repo = g.oracle.GetRepository<District>();
repo.DbContextOptions.EnableAddOrUpdateNavigateList = true;
repo.Insert(new District
{
Code = "001",
Name = "001_name",
Childs = new List<District>(new[] {
new District{
Code = "001_01",
Name = "001_01_name"
},
new District{
Code = "001_02",
Name = "001_02_name"
}
})
});
var ddd = g.oracle.Select<District>().LeftJoin(d => d.ParentCode == d.Parent.Code).ToTreeList();
Assert.Equal(1, ddd.Count);
Assert.Equal(2, ddd[0].Childs.Count);
}
public class District
{
[Column(IsPrimary = true, StringLength = 6)]
public string Code { get; set; }
[Column(StringLength = 20, IsNullable = false)]
public string Name { get; set; }
[Column(StringLength = 6)]
public string ParentCode { get; set; }
[Navigate(nameof(ParentCode))]
public District Parent { get; set; }
[Navigate(nameof(ParentCode))]
public List<District> Childs { get; set; }
} }
[Fact] [Fact]
public void ToDictionary() public void ToDictionary()

39
FreeSql.Tests/FreeSql.Tests.Provider.Odbc/PostgreSQL/Curd/PostgreSQLSelectTest.cs
View File

@ -267,6 +267,45 @@ namespace FreeSql.Tests.Odbc.PostgreSQL
var t11 = select.Where(a => a.Type.Name.Length > 0).ToList(true); var t11 = select.Where(a => a.Type.Name.Length > 0).ToList(true);
var t21 = select.Where(a => a.Type.Parent.Name.Length > 0).ToList(true); var t21 = select.Where(a => a.Type.Parent.Name.Length > 0).ToList(true);
g.pgsql.Delete<District>().Where("1=1").ExecuteAffrows();
var repo = g.pgsql.GetRepository<District>();
repo.DbContextOptions.EnableAddOrUpdateNavigateList = true;
repo.Insert(new District
{
Code = "001",
Name = "001_name",
Childs = new List<District>(new[] {
new District{
Code = "001_01",
Name = "001_01_name"
},
new District{
Code = "001_02",
Name = "001_02_name"
}
})
});
var ddd = g.pgsql.Select<District>().LeftJoin(d => d.ParentCode == d.Parent.Code).ToTreeList();
Assert.Equal(1, ddd.Count);
Assert.Equal(2, ddd[0].Childs.Count);
}
public class District
{
[Column(IsPrimary = true, StringLength = 6)]
public string Code { get; set; }
[Column(StringLength = 20, IsNullable = false)]
public string Name { get; set; }
[Column(StringLength = 6)]
public string ParentCode { get; set; }
[Navigate(nameof(ParentCode))]
public District Parent { get; set; }
[Navigate(nameof(ParentCode))]
public List<District> Childs { get; set; }
} }
[Fact] [Fact]
public void ToDictionary() public void ToDictionary()

39
FreeSql.Tests/FreeSql.Tests.Provider.Odbc/SqlServer/Curd/SqlServerSelectTest.cs
View File

@ -181,6 +181,45 @@ namespace FreeSql.Tests.Odbc.SqlServer
var t11 = select.Where(a => a.Type.Name.Length > 0).ToList(true); var t11 = select.Where(a => a.Type.Name.Length > 0).ToList(true);
var t21 = select.Where(a => a.Type.Parent.Name.Length > 0).ToList(true); var t21 = select.Where(a => a.Type.Parent.Name.Length > 0).ToList(true);
g.sqlserver.Delete<District>().Where("1=1").ExecuteAffrows();
var repo = g.sqlserver.GetRepository<District>();
repo.DbContextOptions.EnableAddOrUpdateNavigateList = true;
repo.Insert(new District
{
Code = "001",
Name = "001_name",
Childs = new List<District>(new[] {
new District{
Code = "001_01",
Name = "001_01_name"
},
new District{
Code = "001_02",
Name = "001_02_name"
}
})
});
var ddd = g.sqlserver.Select<District>().LeftJoin(d => d.ParentCode == d.Parent.Code).ToTreeList();
Assert.Equal(1, ddd.Count);
Assert.Equal(2, ddd[0].Childs.Count);
}
public class District
{
[Column(IsPrimary = true, StringLength = 6)]
public string Code { get; set; }
[Column(StringLength = 20, IsNullable = false)]
public string Name { get; set; }
[Column(StringLength = 6)]
public string ParentCode { get; set; }
[Navigate(nameof(ParentCode))]
public District Parent { get; set; }
[Navigate(nameof(ParentCode))]
public List<District> Childs { get; set; }
} }
[Fact] [Fact]
public void ToDictionary() public void ToDictionary()

39
FreeSql.Tests/FreeSql.Tests/MsAccess/Curd/MsAccessSelectTest.cs
View File

@ -182,6 +182,45 @@ namespace FreeSql.Tests.MsAccess
var t11 = select.Where(a => a.Type.Name.Length > 0).ToList(true); var t11 = select.Where(a => a.Type.Name.Length > 0).ToList(true);
var t21 = select.Where(a => a.Type.Parent.Name.Length > 0).ToList(true); var t21 = select.Where(a => a.Type.Parent.Name.Length > 0).ToList(true);
g.msaccess.Delete<District>().Where("1=1").ExecuteAffrows();
var repo = g.msaccess.GetRepository<District>();
repo.DbContextOptions.EnableAddOrUpdateNavigateList = true;
repo.Insert(new District
{
Code = "001",
Name = "001_name",
Childs = new List<District>(new[] {
new District{
Code = "001_01",
Name = "001_01_name"
},
new District{
Code = "001_02",
Name = "001_02_name"
}
})
});
var ddd = g.msaccess.Select<District>().LeftJoin(d => d.ParentCode == d.Parent.Code).ToTreeList();
Assert.Equal(1, ddd.Count);
Assert.Equal(2, ddd[0].Childs.Count);
}
public class District
{
[Column(IsPrimary = true, StringLength = 6)]
public string Code { get; set; }
[Column(StringLength = 20, IsNullable = false)]
public string Name { get; set; }
[Column(StringLength = 6)]
public string ParentCode { get; set; }
[Navigate(nameof(ParentCode))]
public District Parent { get; set; }
[Navigate(nameof(ParentCode))]
public List<District> Childs { get; set; }
} }
[Fact] [Fact]
public void ToDictionary() public void ToDictionary()

39
FreeSql.Tests/FreeSql.Tests/MySql/Curd/MySqlSelectTest.cs
View File

@ -291,6 +291,45 @@ namespace FreeSql.Tests.MySql
var t11 = select.Where(a => a.Type.Name.Length > 0).ToList(true); var t11 = select.Where(a => a.Type.Name.Length > 0).ToList(true);
var t21 = select.Where(a => a.Type.Parent.Name.Length > 0).ToList(true); var t21 = select.Where(a => a.Type.Parent.Name.Length > 0).ToList(true);
g.mysql.Delete<District>().Where("1=1").ExecuteAffrows();
var repo = g.mysql.GetRepository<District>();
repo.DbContextOptions.EnableAddOrUpdateNavigateList = true;
repo.Insert(new District
{
Code = "001",
Name = "001_name",
Childs = new List<District>(new[] {
new District{
Code = "001_01",
Name = "001_01_name"
},
new District{
Code = "001_02",
Name = "001_02_name"
}
})
});
var ddd = g.mysql.Select<District>().LeftJoin(d => d.ParentCode == d.Parent.Code).ToTreeList();
Assert.Equal(1, ddd.Count);
Assert.Equal(2, ddd[0].Childs.Count);
}
public class District
{
[Column(IsPrimary = true, StringLength = 6)]
public string Code { get; set; }
[Column(StringLength = 20, IsNullable = false)]
public string Name { get; set; }
[Column(StringLength = 6)]
public string ParentCode { get; set; }
[Navigate(nameof(ParentCode))]
public District Parent { get; set; }
[Navigate(nameof(ParentCode))]
public List<District> Childs { get; set; }
} }
[Fact] [Fact]
public void ToDictionary() public void ToDictionary()

39
FreeSql.Tests/FreeSql.Tests/Oracle/Curd/OracleSelectTest.cs
View File

@ -191,6 +191,45 @@ namespace FreeSql.Tests.Oracle
var t11 = select.Where(a => a.Type.Name.Length > 0).ToList(true); var t11 = select.Where(a => a.Type.Name.Length > 0).ToList(true);
var t21 = select.Where(a => a.Type.Parent.Name.Length > 0).ToList(true); var t21 = select.Where(a => a.Type.Parent.Name.Length > 0).ToList(true);
g.oracle.Delete<District>().Where("1=1").ExecuteAffrows();
var repo = g.oracle.GetRepository<District>();
repo.DbContextOptions.EnableAddOrUpdateNavigateList = true;
repo.Insert(new District
{
Code = "001",
Name = "001_name",
Childs = new List<District>(new[] {
new District{
Code = "001_01",
Name = "001_01_name"
},
new District{
Code = "001_02",
Name = "001_02_name"
}
})
});
var ddd = g.oracle.Select<District>().LeftJoin(d => d.ParentCode == d.Parent.Code).ToTreeList();
Assert.Equal(1, ddd.Count);
Assert.Equal(2, ddd[0].Childs.Count);
}
public class District
{
[Column(IsPrimary = true, StringLength = 6)]
public string Code { get; set; }
[Column(StringLength = 20, IsNullable = false)]
public string Name { get; set; }
[Column(StringLength = 6)]
public string ParentCode { get; set; }
[Navigate(nameof(ParentCode))]
public District Parent { get; set; }
[Navigate(nameof(ParentCode))]
public List<District> Childs { get; set; }
} }
[Fact] [Fact]
public void ToDictionary() public void ToDictionary()

39
FreeSql.Tests/FreeSql.Tests/PostgreSQL/Curd/PostgreSQLSelectTest.cs
View File

@ -267,6 +267,45 @@ namespace FreeSql.Tests.PostgreSQL
var t11 = select.Where(a => a.Type.Name.Length > 0).ToList(true); var t11 = select.Where(a => a.Type.Name.Length > 0).ToList(true);
var t21 = select.Where(a => a.Type.Parent.Name.Length > 0).ToList(true); var t21 = select.Where(a => a.Type.Parent.Name.Length > 0).ToList(true);
g.pgsql.Delete<District>().Where("1=1").ExecuteAffrows();
var repo = g.pgsql.GetRepository<District>();
repo.DbContextOptions.EnableAddOrUpdateNavigateList = true;
repo.Insert(new District
{
Code = "001",
Name = "001_name",
Childs = new List<District>(new[] {
new District{
Code = "001_01",
Name = "001_01_name"
},
new District{
Code = "001_02",
Name = "001_02_name"
}
})
});
var ddd = g.pgsql.Select<District>().LeftJoin(d => d.ParentCode == d.Parent.Code).ToTreeList();
Assert.Equal(1, ddd.Count);
Assert.Equal(2, ddd[0].Childs.Count);
}
public class District
{
[Column(IsPrimary = true, StringLength = 6)]
public string Code { get; set; }
[Column(StringLength = 20, IsNullable = false)]
public string Name { get; set; }
[Column(StringLength = 6)]
public string ParentCode { get; set; }
[Navigate(nameof(ParentCode))]
public District Parent { get; set; }
[Navigate(nameof(ParentCode))]
public List<District> Childs { get; set; }
} }
[Fact] [Fact]
public void ToDictionary() public void ToDictionary()

39
FreeSql.Tests/FreeSql.Tests/SqlServer/Curd/SqlServerSelectTest.cs
View File

@ -191,6 +191,45 @@ namespace FreeSql.Tests.SqlServer
var t11 = select.Where(a => a.Type.Name.Length > 0).ToList(true); var t11 = select.Where(a => a.Type.Name.Length > 0).ToList(true);
var t21 = select.Where(a => a.Type.Parent.Name.Length > 0).ToList(true); var t21 = select.Where(a => a.Type.Parent.Name.Length > 0).ToList(true);
g.sqlserver.Delete<District>().Where("1=1").ExecuteAffrows();
var repo = g.sqlserver.GetRepository<District>();
repo.DbContextOptions.EnableAddOrUpdateNavigateList = true;
repo.Insert(new District
{
Code = "001",
Name = "001_name",
Childs = new List<District>(new[] {
new District{
Code = "001_01",
Name = "001_01_name"
},
new District{
Code = "001_02",
Name = "001_02_name"
}
})
});
var ddd = g.sqlserver.Select<District>().LeftJoin(d => d.ParentCode == d.Parent.Code).ToTreeList();
Assert.Equal(1, ddd.Count);
Assert.Equal(2, ddd[0].Childs.Count);
}
public class District
{
[Column(IsPrimary = true, StringLength = 6)]
public string Code { get; set; }
[Column(StringLength = 20, IsNullable = false)]
public string Name { get; set; }
[Column(StringLength = 6)]
public string ParentCode { get; set; }
[Navigate(nameof(ParentCode))]
public District Parent { get; set; }
[Navigate(nameof(ParentCode))]
public List<District> Childs { get; set; }
} }
[Fact] [Fact]
public void ToDictionary() public void ToDictionary()

39
FreeSql.Tests/FreeSql.Tests/Sqlite/Curd/SqliteSelectTest.cs
View File

@ -208,6 +208,45 @@ namespace FreeSql.Tests.Sqlite
var t11 = select.Where(a => a.Type.Name.Length > 0).ToList(true); var t11 = select.Where(a => a.Type.Name.Length > 0).ToList(true);
var t21 = select.Where(a => a.Type.Parent.Name.Length > 0).ToList(true); var t21 = select.Where(a => a.Type.Parent.Name.Length > 0).ToList(true);
g.sqlite.Delete<District>().Where("1=1").ExecuteAffrows();
var repo = g.sqlite.GetRepository<District>();
repo.DbContextOptions.EnableAddOrUpdateNavigateList = true;
repo.Insert(new District
{
Code = "001",
Name = "001_name",
Childs = new List<District>(new[] {
new District{
Code = "001_01",
Name = "001_01_name"
},
new District{
Code = "001_02",
Name = "001_02_name"
}
})
});
var ddd = g.sqlite.Select<District>().LeftJoin(d => d.ParentCode == d.Parent.Code).ToTreeList();
Assert.Equal(1, ddd.Count);
Assert.Equal(2, ddd[0].Childs.Count);
}
public class District
{
[Column(IsPrimary = true, StringLength = 6)]
public string Code { get; set; }
[Column(StringLength = 20, IsNullable = false)]
public string Name { get; set; }
[Column(StringLength = 6)]
public string ParentCode { get; set; }
[Navigate(nameof(ParentCode))]
public District Parent { get; set; }
[Navigate(nameof(ParentCode))]
public List<District> Childs { get; set; }
} }
[Fact] [Fact]
public void ToDictionary() public void ToDictionary()

4
FreeSql/Internal/CommonProvider/SelectProvider/Select1Provider.cs
View File

@ -712,7 +712,7 @@ namespace FreeSql.Internal.CommonProvider
string key = null; string key = null;
if (tbref.RefColumns.Count == 1) if (tbref.RefColumns.Count == 1)
{ {
key = _orm.GetEntityValueWithPropertyName(tbref.RefEntityType, nav, tbref.RefColumns[0].CsName).ToString(); key = _orm.GetEntityValueWithPropertyName(tbref.RefEntityType, nav, tbref.RefColumns[0].CsName)?.ToString() ?? "";
} }
else else
{ {
@ -1043,7 +1043,7 @@ namespace FreeSql.Internal.CommonProvider
{ {
string key = null; string key = null;
if (tbref.Columns.Count == 1) if (tbref.Columns.Count == 1)
key = _orm.GetEntityValueWithPropertyName(tbref.RefMiddleEntityType, midList[a], tbref.MiddleColumns[0].CsName).ToString(); key = _orm.GetEntityValueWithPropertyName(tbref.RefMiddleEntityType, midList[a], tbref.MiddleColumns[0].CsName)?.ToString() ?? "";
else else
{ {
var sb = new StringBuilder(); var sb = new StringBuilder();