sql - 使用 Dapper 将子列表插入 SQL

Question

我有以下 2 个表:

public class TestA
{
    public int Id { get; set; }
    public string Name { get; set; }

    public IEnumerable<TestB> Test { get; set; }
}

public class TestB
{
    public int Id { get; set; }
    public int TestAId { get; set; }
}

我的想法是我可以从我的 TestA 对象访问与 TestA 相关的所有 TestB 记录。我想弄清楚的是如何插入测试 A 和测试 B，尤其是当测试 B 有多行与测试 A 相关时。这是我尝试过的:

var data = new TestA
{
    Name = "ABC",
    Id = 1,
    Test = new List<TestB>
    {
        new TestB() { Id = 1, TestAId = 1},
        new TestB() {Id = 2, TestAId = 1},
        new TestB() {Id = 3, TestAId = 1}
    }
};

var query = "INSERT INTO TestA(Id, Name) VALUES(@Id, @Name) INSERT INTO TestB(Id, TestAId) VALUES(@Test.TestB.Id, @Test.TestB.TestAId)";

using (var con = conn)
{
    con.Execute(query, data);
}

我知道我们可以给 dapper 一个列表，它足够智能来枚举该列表并插入单独的记录，但是如果该列表是对象的子项，我该如何完成同样的事情？我尝试让我的值也成为 @Test.Id, @Test.TestAId 但它有完全相同的错误。

The member of type Test.TestB cannot be used as a parameter value

Answer 1

你能试试这个吗:

var data = new TestA
{
    Name = "ABC",
    Id = 1,
    Test = new List<TestB>
    {
        new TestB() { Id = 1, TestAId = 1},
        new TestB() {Id = 2, TestAId = 1},
        new TestB() {Id = 3, TestAId = 1}
    }
};

var query = "INSERT INTO TestA(Id, Name) VALUES(@Id, @Name) INSERT INTO TestB(Id, TestAId) VALUES(@Test.TestB.Id, @Test.TestB.TestAId)";

using (var con = conn)
{
    var query = "INSERT INTO TestA(Id, Name) VALUES(@Id, @Name)";
    con.Execute(query, new { Id = data.Id, Name = data.Name });


    foreach (var item in data.Test)
    {
        string processQuery = "INSERT INTO TestB(Id, TestAId) VALUES (@Id, @TestAId )";        
        connection.Execute(processQuery, item);
    }
}