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Cascade Saving
中文 | English
In practice, it has been found that N-to-1 is not suitable for cascading saving, for example: when saving the Topic, do you also save the Type information? The function of saving from bottom to top is too uncontrollable. Therefore, the following will only discuss OneToOne/OneToMany/ManyToMany cascading saves.
Completely save the specified navigation attributes, compare the existing data in the table, and calculate the execution of adding, modifying, and deleting.
var repo = fsql.GetRepository<Type>();
var type = new Type
{
name = "c#",
Topics = new List<Topic>(new[]
{
new Topic { ... }
})
};
repo.Insert(type);
repo.SaveMany(type, "Topics"); ////Manually and completely save topics-SaveMany only supports onetomany and manytomany navigation properties -Save only topics, not downward recursive tracing -When Topics is Empty, delete all table data of Topics that exist for type -ManyToMany compares and saves the intermediate table completely, and only appends and does not update the external table
For example:
-This table Song -External table Tag -Intermediate table SongTag
This function was implemented earlier and can be used to learn about the latest AggregateRoot level linkage system
Dbcontext / repository EnableCascadeSave can realize recursive tracing and save the OneToOne/OneToMany/ManyToMany navigation attributes when saving objects. This document describes the mechanism to prevent misuse.
- Onetoone cascade save
v3. 2.606 + support, and support cascade deletion function
- Onetomany appends or updates the sub table without deleting the existing data of the sub table
repo. DbContextOptions. EnableCascadeSave = true; // Manual opening required
repo. Insert(type);-Do not delete data that already exists in the Topics subtable -When the Topics attribute is Empty, no action is taken -When saving Topics, the subordinate set properties of Topics \ [0-.. ] will also be saved, down 18 layers
For example, in the [type] table, there is set attribute [article] below and set attribute [comment] below [article].
When saving the [type] table object, it will retrieve the set attribute [article], and then if the [article] is saved, it will continue to retrieve the set attribute [comment]. Do insertorupdate operation together.
- Manytomany completely compares and saves the intermediate table and appends the external table
Compare and save the intermediate table completely, compare the existing data of the [many to many] intermediate table, and calculate the execution of addition, modification and deletion.
Append external tables, only append without updating.
Test 1: append and save OneToMany
class Cagetory
{
public Guid Id { get; set; }
public string Name { get; set; }
public Guid ParentId { get; set; }
[Navigate(nameof(ParentId))]
public List<Cagetory> Childs { get; set; }
}
public void TestOneToManyParent()
{
var repo = fsql.GetRepository<Cagetory>();
repo.DbContextOptions.EnableCascadeSave = true;
var cts = new[]
{
new Cagetory
{
Name = "class1",
Childs = new List<Cagetory>(new[]
{
new Cagetory { Name = "class1_1" },
new Cagetory { Name = "class1_2" },
new Cagetory { Name = "class1_3" }
})
},
new Cagetory
{
Name = "class2",
Childs = new List<Cagetory>(new[]
{
new Cagetory { Name = "class2_1" },
new Cagetory { Name = "class2_2" }
})
}
};
repo.Insert(cts);
//To create a table and insert data:
//INSERT INTO "Cagetory"("Id", "Name", "ParentId") VALUES('5d90afcb-ed57-f6f4-0082-cb6b78eaaf9f', 'class1', '00000000-0000-0000-0000-000000000000'), ('5d90afcb-ed57-f6f4-0082-cb6c5b531b3e', 'class2', '00000000-0000-0000-0000-000000000000')
//INSERT INTO "Cagetory"("Id", "Name", "ParentId") VALUES('5d90afcb-ed57-f6f4-0082-cb6d0c1c5f1a', 'class1_1', '5d90afcb-ed57-f6f4-0082-cb6b78eaaf9f'), ('5d90afcb-ed57-f6f4-0082-cb6e74bd8eef', 'class1_2', '5d90afcb-ed57-f6f4-0082-cb6b78eaaf9f'), ('5d90afcb-ed57-f6f4-0082-cb6f6267cc5f', 'class1_3', '5d90afcb-ed57-f6f4-0082-cb6b78eaaf9f'), ('5d90afcb-ed57-f6f4-0082-cb7057c41d46', 'class2_1', '5d90afcb-ed57-f6f4-0082-cb6c5b531b3e'), ('5d90afcb-ed57-f6f4-0082-cb7156e0375e', 'class2_2', '5d90afcb-ed57-f6f4-0082-cb6c5b531b3e')
cts[0].Name = "class11";
cts[0].Childs.Clear();
cts[1].Name = "class22";
cts[1].Childs.Clear();
repo.Update(cts);
//UPDATE "Cagetory" SET "Name" = CASE "Id"
//WHEN '5d90afcb-ed57-f6f4-0082-cb6b78eaaf9f' THEN 'class11'
//WHEN '5d90afcb-ed57-f6f4-0082-cb6c5b531b3e' THEN 'class22' END
//WHERE ("Id" IN ('5d90afcb-ed57-f6f4-0082-cb6b78eaaf9f','5d90afcb-ed57-f6f4-0082-cb6c5b531b3e'))
//Childs.Clear After that, the operation of deleting subsets was not performed, indicating that no complete comparison was made
cts[0].Name = "class111";
cts[0].Childs.Clear();
cts[0].Childs.Add(new Cagetory { Name = "class1_33" });
cts[1].Name = "class222";
cts[1].Childs.Clear();
cts[1].Childs.Add(new Cagetory { Name = "class2_22" });
repo.Update(cts);
//UPDATE "Cagetory" SET "Name" = CASE "Id"
//WHEN '5d90afcb-ed57-f6f4-0082-cb6b78eaaf9f' THEN 'class111'
//WHEN '5d90afcb-ed57-f6f4-0082-cb6c5b531b3e' THEN 'class222' END
//WHERE ("Id" IN ('5d90afcb-ed57-f6f4-0082-cb6b78eaaf9f','5d90afcb-ed57-f6f4-0082-cb6c5b531b3e'))
//INSERT INTO "Cagetory"("Id", "Name", "ParentId") VALUES('5d90afe8-ed57-f6f4-0082-cb725df546ea', 'class1_33', '5d90afcb-ed57-f6f4-0082-cb6b78eaaf9f'), ('5d90afe8-ed57-f6f4-0082-cb7338a6214c', 'class2_22', '5d90afcb-ed57-f6f4-0082-cb6c5b531b3e')
}Test 2: Full save ManyToMany
class Song
{
public Guid Id { get; set; }
public string Name { get; set; }
public List<Tag> Tags { get; set; }
}
class Tag
{
public Guid Id { get; set; }
public string TagName { get; set; }
public List<Song> Songs { get; set; }
}
class SongTag
{
public Guid SongId { get; set; }
public Song Song { get; set; }
public Guid TagId { get; set; }
public Tag Tag { get; set; }
}
public void TestManyToMany()
{
var tags = new[]
{
new Tag { TagName = "pop music" },
new Tag { TagName = "the post-80s generation" },
new Tag { TagName = "the post-00s generation" },
new Tag { TagName = "Rock music" }
};
var ss = new[]
{
new Song
{
Name = "love you forever.mp3",
Tags = new List<Tag>(new[]
{
tags[0], tags[1]
})
},
new Song
{
Name = "Li Bai.mp3",
Tags = new List<Tag>(new[]
{
tags[0], tags[2]
})
}
};
var repo = fsql.GetRepository<Song>();
repo.DbContextOptions.EnableCascadeSave = true;
repo.Insert(ss);
//INSERT INTO "Song"("Id", "Name") VALUES('5d90fdb3-6a6b-2c58-00c8-37974177440d', 'love you forever.mp3'), ('5d90fdb3-6a6b-2c58-00c8-37987f29b197', 'Li Bai.mp3')
//INSERT INTO "Tag"("Id", "TagName") VALUES('5d90fdb7-6a6b-2c58-00c8-37991ead4f05', 'pop music'), ('5d90fdbd-6a6b-2c58-00c8-379a0432a09c', 'the post-80s generation')
//INSERT INTO "SongTag"("SongId", "TagId") VALUES('5d90fdb3-6a6b-2c58-00c8-37974177440d', '5d90fdb7-6a6b-2c58-00c8-37991ead4f05'), ('5d90fdb3-6a6b-2c58-00c8-37974177440d', '5d90fdbd-6a6b-2c58-00c8-379a0432a09c')
//INSERT INTO "Tag"("Id", "TagName") VALUES('5d90fdcc-6a6b-2c58-00c8-379b5af59d25', 'the post-00s generation')
//INSERT INTO "SongTag"("SongId", "TagId") VALUES('5d90fdb3-6a6b-2c58-00c8-37987f29b197', '5d90fdb7-6a6b-2c58-00c8-37991ead4f05'), ('5d90fdb3-6a6b-2c58-00c8-37987f29b197', '5d90fdcc-6a6b-2c58-00c8-379b5af59d25')
ss[0].Name = "love you forever.mp5";
ss[0].Tags.Clear();
ss[0].Tags.Add(tags[0]);
ss[1].Name = "Li Bai.mp5";
ss[1].Tags.Clear();
ss[1].Tags.Add(tags[3]);
repo.Update(ss);
//UPDATE "Song" SET "Name" = CASE "Id"
//WHEN '5d90fdb3-6a6b-2c58-00c8-37974177440d' THEN 'love you forever.mp5'
//WHEN '5d90fdb3-6a6b-2c58-00c8-37987f29b197' THEN 'Li Bai.mp5' END
//WHERE ("Id" IN ('5d90fdb3-6a6b-2c58-00c8-37974177440d','5d90fdb3-6a6b-2c58-00c8-37987f29b197'))
//SELECT a."SongId", a."TagId"
//FROM "SongTag" a
//WHERE (a."SongId" = '5d90fdb3-6a6b-2c58-00c8-37974177440d')
//DELETE FROM "SongTag" WHERE ("SongId" = '5d90fdb3-6a6b-2c58-00c8-37974177440d' AND "TagId" = '5d90fdbd-6a6b-2c58-00c8-379a0432a09c')
//INSERT INTO "Tag"("Id", "TagName") VALUES('5d90febd-6a6b-2c58-00c8-379c21acfc72', 'Rock music')
//SELECT a."SongId", a."TagId"
//FROM "SongTag" a
//WHERE (a."SongId" = '5d90fdb3-6a6b-2c58-00c8-37987f29b197')
//DELETE FROM "SongTag" WHERE ("SongId" = '5d90fdb3-6a6b-2c58-00c8-37987f29b197' AND "TagId" = '5d90fdb7-6a6b-2c58-00c8-37991ead4f05' OR "SongId" = '5d90fdb3-6a6b-2c58-00c8-37987f29b197' AND "TagId" = '5d90fdcc-6a6b-2c58-00c8-379b5af59d25')
//INSERT INTO "SongTag"("SongId", "TagId") VALUES('5d90fdb3-6a6b-2c58-00c8-37987f29b197', '5d90febd-6a6b-2c58-00c8-379c21acfc72')
ss[0].Name = "love you forever.mp4";
ss[0].Tags.Clear();
ss[1].Name = "Li Bai.mp4";
ss[1].Tags.Clear();
repo.Update(ss);
//DELETE FROM "SongTag" WHERE ("SongId" = '5d90fdb3-6a6b-2c58-00c8-37974177440d')
//DELETE FROM "SongTag" WHERE ("SongId" = '5d90fdb3-6a6b-2c58-00c8-37987f29b197')
//UPDATE "Song" SET "Name" = CASE "Id"
//WHEN '5d90fdb3-6a6b-2c58-00c8-37974177440d' THEN 'love you forever.mp4'
//WHEN '5d90fdb3-6a6b-2c58-00c8-37987f29b197' THEN 'Li Bai.mp4' END
//WHERE ("Id" IN ('5d90fdb3-6a6b-2c58-00c8-37974177440d','5d90fdb3-6a6b-2c58-00c8-37987f29b197'))
}