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我一直在努力让我的 SqlDataAdapters 一起工作以通过单个 SQL 事务将一行插入到父表和子表中。我似乎无法从父级获取 ID 级联到子表。

我正在使用 MSSQL 2012。我在 dbo.parent ID 和 dbo.child parent_id 列之间设置了外键约束。下面代码的结果是：

The INSERT statement conflicted with the FOREIGN KEY constraint "FK_Child_Parent". The conflict occurred in database "Test_Project", table "dbo.Parent", column'id'.
The statement has been terminated.

我希望有人可以帮助我填补缺失的空白，以使代码正常工作。非常感谢！:)

SqlConnection sqlConn = new SqlConnection("Data Source=(Local);Initial Catalog=Test_Project;Integrated Security=True;");
DataSet ds = new DataSet();


// Fetch Data from both tables
SqlDataAdapter parentAdapter = new SqlDataAdapter("SELECT * FROM Parent", sqlConn);
parentAdapter.FillSchema(ds, SchemaType.Source, "Parent");
parentAdapter.Fill(ds, "Parent");

SqlDataAdapter childAdapter = new SqlDataAdapter("SELECT * FROM Child", sqlConn);
childAdapter.FillSchema(ds, SchemaType.Source, "Child");
childAdapter.Fill(ds, "Child");


// Not sure if this step is necessary but I included it for good measure.
ds.Relations.Add(new DataRelation("ParentChildRelation", ds.Tables["Parent"].Columns["id"], ds.Tables["Child"].Columns["parent_id"], true));


// Now add some data...
DataRow parentDr = ds.Tables["Parent"].NewRow();
parentDr["name"] = "Parent1";
ds.Tables["Parent"].Rows.Add(parentDr);

DataRow childDr = ds.Tables["Child"].NewRow();
childDr["parent_id"] = parentDr["id"]; // <- This column always fills NULL.
childDr["name"] = "Child1";
childDr.SetParentRow(parentDr, ds.Relations["ParentChildRelation"]);
ds.Tables["Child"].Rows.Add(childDr);


// Call DataSet updates back to SQL
SqlCommandBuilder parentCmdBuilder = new SqlCommandBuilder(parentAdapter);
SqlCommandBuilder childCmdBuilder = new SqlCommandBuilder(childAdapter);

if (ds.HasChanges())
{
    ds = ds.GetChanges();

    sqlConn.Open();
    SqlTransaction sqlTrans = sqlConn.BeginTransaction();

    try
    {
        parentAdapter.SelectCommand.Transaction = sqlTrans;
        parentCmdBuilder.GetInsertCommand().Transaction = sqlTrans;
        parentAdapter.Update(ds, "Parent");

        childAdapter.SelectCommand.Transaction = sqlTrans;
        childCmdBuilder.GetInsertCommand().Transaction = sqlTrans;
        childAdapter.Update(ds, "Child");


        sqlTrans.Commit();
        sqlConn.Close();
    }
    catch (Exception ex)
    {
        sqlTrans.Rollback();
        sqlConn.Close();
        Console.WriteLine(ex.Message);
    }
}

编辑：我可能为这个问题增加了一层额外的复杂性。通过取出与 SqlTransaction 相关的所有代码，我仍然得到相同的“INSERT 语句与 FOREIGN KEY 约束冲突”错误。

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1 回答 1

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您要添加此行：

ds.Tables["Child"].Constraints.Add(
    new ForeignKeyConstraint(
        ds.Tables["Parent"].Columns["id"],
        ds.Tables["Child"].Columns["parent_id"]
    )
);

看，尽管您在数据库级别设置了这些约束，但您需要构建此约束，以便id字段在从数据库返回后级联到字段。parent_id

于 2013-07-02T12:53:12.080 回答