Question

我具有以下用于将对象添加到数据库的功能：

public void AddEnterpriseShare(Objects.FinancialTransactionEnterpriseShare share)
{
    _services.DbContext.FinancialTransactionEnterpriseShares.Add(share);
    _services.DbContext.SaveChanges();
}

我这样称呼它：

foreach (var enterprise in model.Enterprise)
{
    Service.FinancialTransactionServices.AddEnterpriseShare(new Data.Objects.FinancialTransactionEnterpriseShare()
    {
       ProfitLossId = profitLoss.Id,
       EnterpriseId = enterprise.Id,
       Percentage = enterprise.Percent,
       FinancialTransactionId = transaction.Id
   });
}

此循环应运行6次，并将6条新记录添加到数据库中，每个ID一条。如果我单步执行此代码，则可以看到在数据库中创建了记录。然后在第二次循环中，原始记录正在更新，而不是第二条记录被插入！

为什么我会看到这种行为？

实体类如下：

public class FinancialTransactionEnterpriseShare
{
    public int Id { get; set; }
    public int ProfitLossId { get; set; }
    public int EnterpriseId { get; set; }
    public decimal Percentage { get; set; }
    public int FinancialTransactionId { get; set; }

    public ProfitLoss ProfitLoss { get; set; }
    public Enterprise Enterprise { get; set; }
    public FinancialTransaction FinancialTransaction { get; set; }
}

migrationBuilder.CreateTable(
            name: "FinancialTransactionEnterpriseShares",
            columns: table => new
            {
                Id = table.Column<int>(nullable: false)
                    .Annotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn),
                EnterpriseId = table.Column<int>(nullable: false),
                FinancialTransactionId = table.Column<int>(nullable: false),
                Percentage = table.Column<decimal>(nullable: false),
                ProfitLossId = table.Column<int>(nullable: false)
            },
            constraints: table =>
            {
                table.PrimaryKey("PK_FinancialTransactionEnterpriseShares", x => x.Id);
                table.ForeignKey(
                    name: "FK_FinancialTransactionEnterpriseShares_Enterprises_EnterpriseId",
                    column: x => x.EnterpriseId,
                    principalTable: "Enterprises",
                    principalColumn: "Id",
                    onDelete: ReferentialAction.NoAction);
                table.ForeignKey(
                    name: "FK_FinancialTransactionEnterpriseShares_FinancialTransactions_FinancialTransactionId",
                    column: x => x.FinancialTransactionId,
                    principalTable: "FinancialTransactions",
                    principalColumn: "Id",
                    onDelete: ReferentialAction.NoAction);
                table.ForeignKey(
                    name: "FK_FinancialTransactionEnterpriseShares_ProfitLosses_ProfitLossId",
                    column: x => x.ProfitLossId,
                    principalTable: "ProfitLosses",
                    principalColumn: "Id",
                    onDelete: ReferentialAction.NoAction);
            });

        migrationBuilder.CreateIndex(
            name: "IX_FinancialTransactionEnterpriseShares_EnterpriseId",
            table: "FinancialTransactionEnterpriseShares",
            column: "EnterpriseId");

        migrationBuilder.CreateIndex(
            name: "IX_FinancialTransactionEnterpriseShares_FinancialTransactionId",
            table: "FinancialTransactionEnterpriseShares",
            column: "FinancialTransactionId",
            unique: true);

        migrationBuilder.CreateIndex(
            name: "IX_FinancialTransactionEnterpriseShares_ProfitLossId",
            table: "FinancialTransactionEnterpriseShares",
            column: "ProfitLossId");

Answer 1

由于上面的Ivan Stoevs评论，我现在已经找到了问题。

FinancialTransaction类包含对FinancialTransactionEnterpriseSplit类的引用-此引用设置为1：1而不是1：*。结果，在生成FinancialTransactionId字段时，其唯一标志设置为true。

更新代码以使用ICollection<FinancialTransactionEnterpriseSplit>中的FinancialTransaction解决了该问题，导致正确创建了字段。

实体框架Add（）正在更新而不是插入

1 个答案: