13

我敢肯定这条线没有工作的原因非常简单,但过去一周它已经回避了,所以我希望其他人会注意到我的错。

我已经在这个项目上工作了几个星期到一个月。我一直在使用旧的 DataAdapter、CommandBuiler 等,在 1 个数据库上使用一些 linq to sql 编码,以及多个 Windows 应用程序表单。此特定表单使用 DataAdapter、Dataset 和 Command Builder 从数据库中编辑或删除行。它一直工作正常,直到我换了电脑。现在数据集正在更新,但数据库没有。

这是此表单的完整代码:

private void exitToolStripMenuItem_Click(object sender, EventArgs e)
{
    if (MessageBox.Show("Exit Cook Book?", "Exit?", MessageBoxButtons.OKCancel) == DialogResult.OK)
    {
        Application.Exit();
    }
}

private void goBackToolStripMenuItem_Click(object sender, EventArgs e)
{
    AddRecipe goBack = new AddRecipe();

    Close();
    goBack.Show();
}

private void helpToolStripMenuItem_Click(object sender, EventArgs e)
{
    MessageBox.Show("Scan through the Cook Book to find recipes that you wish to edit or delete.", "Help!");
}

SqlConnection con;
SqlDataAdapter dataAdapt;
DataSet dataRecipe;
SqlCommandBuilder cb;

int MaxRows = 0;
int inc = 0;


private void EditRecipe_Load(object sender, EventArgs e)
{
    con = new SqlConnection();
    dataRecipe = new DataSet();

    con.ConnectionString = "Data Source=.\\SQLEXPRESS;AttachDbFilename=|DataDirectory|\\Recipes.mdf;Integrated Security=True;User Instance=True";

        con.Open();

        //MessageBox.Show("Database Open");

        string sql = "SELECT* From CookBookRecipes";
        dataAdapt = new SqlDataAdapter(sql, con);

        dataAdapt.Fill(dataRecipe, "CookBookRecipes");
        NavigateRecords();
        MaxRows = dataRecipe.Tables["CookBookRecipes"].Rows.Count;

        con.Close();
}


private void NavigateRecords()
{
    DataRow dRow = dataRecipe.Tables["CookBookRecipes"].Rows[inc];

    tbRName.Text = dRow.ItemArray.GetValue(0).ToString();
    listBox1.SelectedItem = dRow.ItemArray.GetValue(1).ToString();
    tbRCreate.Text = dRow.ItemArray.GetValue(2).ToString();
    tbRIngredient.Text = dRow.ItemArray.GetValue(3).ToString();
    tbRPrep.Text = dRow.ItemArray.GetValue(4).ToString();
    tbRCook.Text = dRow.ItemArray.GetValue(5).ToString();
    tbRDirections.Text = dRow.ItemArray.GetValue(6).ToString();
    tbRYield.Text = dRow.ItemArray.GetValue(7).ToString();
    textBox1.Text = dRow.ItemArray.GetValue(8).ToString();
}

private void btnNext_Click(object sender, EventArgs e)
{
    if (inc != MaxRows - 1)
    {
        inc++;
        NavigateRecords();
    }
    else
    {
        MessageBox.Show("That's the last recipe of your Cook Book!", "End");
    }
}

private void btnBack_Click(object sender, EventArgs e)
{
    if (inc > 0)
    {
        inc--;
        NavigateRecords();
    }
    else
    {
        MessageBox.Show("This is the first recipe of your Cook Book!", "Start");
    }
}

private void btnSave_Click(object sender, EventArgs e)
{
    cb = new SqlCommandBuilder(dataAdapt);

    DataRow daRow = dataRecipe.Tables["CookBookRecipes"].Rows[inc];

    daRow[0] = tbRName.Text;
    daRow[1] = listBox1.SelectedItem.ToString();
    daRow[2] = tbRCreate.Text;
    daRow[3] = tbRIngredient.Text;
    daRow[4] = tbRPrep.Text;
    daRow[5] = tbRCook.Text;
    daRow[6] = tbRDirections.Text;
    daRow[7] = tbRYield.Text;
    daRow[8] = textBox1.Text;

    if (MessageBox.Show("You wish to save your updates?", "Save Updates?", MessageBoxButtons.OKCancel) == DialogResult.OK)
    {

        dataAdapt.Update(dataRecipe, "CookBookRecipes");

        MessageBox.Show("Recipe Updated", "Update");
    }
}

private void btnDelete_Click(object sender, EventArgs e)
{
    SqlCommandBuilder cb;
    cb = new SqlCommandBuilder(dataAdapt);

    if (MessageBox.Show("You wish to DELETE this recipe?", "Delete?", MessageBoxButtons.OKCancel) == DialogResult.OK)
    {
        dataRecipe.Tables["CookBookRecipes"].Rows[inc].Delete();
        MaxRows--;
        inc = 0;
        NavigateRecords();

        dataAdapt.Update(dataRecipe, "CookBookRecipes");

        MessageBox.Show("Your Recipe has been Deleted", "Delete");
    }
}

这应该更新表:

dataAdapt.Update(dataRecipe, "CookBookRecipes");

我没有收到任何错误,但数据表不会更新。

提前感谢您的帮助,如果您需要更多信息,请告诉我。

4

10 回答 10

13

为了更新数据库中的数据,您的 SqlDataAdapter 需要设置其 InsertCommand、UpdateCommand、DeleteCommand 属性。您创建的 SqlCommandBuilder 实例具有这些命令,但您需要将它们设置为您的 SqlDataAdapter。

在其他世界:介于两者之间

 SqlCommandBuilder cb;
 cb = new SqlCommandBuilder(dataAdapt);

 dataAdapt.Update(dataRecipe, "CookBookRecipes");

你需要

dataAdapt.DeleteCommand = cb.GetDeleteCommand(true);
dataAdapt.UpdateCommand = cb.GetUpdateCommand(true);
dataAdapt.InsertCommand = cb.GetInsertCommand(true);
于 2012-10-16T12:56:13.930 回答
2

SqlCommandfor 更新是什么样的?我看到了命令,但没有看到任何 SqlText,这就是您所缺少的。

您需要.Update通过.UpdateCommandSqlDataAdapter

这个链接给出了一个很好的分解方法:http: //msdn.microsoft.com/en-us/library/system.data.sqlclient.sqldataadapter.updatecommand.aspx

于 2011-07-26T16:33:23.400 回答
1

试试下面的源码。

private void btnSave_Click(object sender, EventArgs e)
{
    cb = new SqlCommandBuilder(dataAdapt);

    //Old source: DataRow daRow = dataRecipe.Tables["CookBookRecipes"].Rows[inc];

    //Added source code
    DataRow daRow = dataRecipe.Tables["CookBookRecipes"].NewRow();

    //Added source code
    dataRecipe.Tables["CookBookRecipes"].AddRow(daRow);

    daRow.BeginEdit();
    daRow[0] = tbRName.Text;
    daRow[1] = listBox1.SelectedItem.ToString();
    daRow[2] = tbRCreate.Text;
    daRow[3] = tbRIngredient.Text;
    daRow[4] = tbRPrep.Text;
    daRow[5] = tbRCook.Text;
    daRow[6] = tbRDirections.Text;
    daRow[7] = tbRYield.Text;
    daRow[8] = textBox1.Text;
    daRow.EndEdit();

    //Reset state of rows to unchanged
    dataRecipe.Tables["CookBookRecipes"].AcceptChanges();
    //Set modified. The dataAdapt will call update stored procedured 
    //for the row that has Modifed row state. 
    //You can also try SetAdded() method for new row you want to insert
    daRow.SetModified();

    if (MessageBox.Show("You wish to save your updates?", "Save Updates?", MessageBoxButtons.OKCancel) == DialogResult.OK)
    {

        dataAdapt.Update(dataRecipe, "CookBookRecipes");

        MessageBox.Show("Recipe Updated", "Update");
    }
}
于 2016-09-01T18:46:09.543 回答
1

在更新之前添加 AcceptChangesDuringUpdate 对我有用,例如:

foreach (string tableName in tableNames)
        {             
            da = new SqlDataAdapter("SELECT * FROM " + tableName, cn);
            cb = new SqlCommandBuilder(da); //initialise the update, insert and delete commands of da
            da.AcceptChangesDuringUpdate = true;
            da.Update(myDataSet, tableName);               
        }
于 2017-02-02T11:35:18.137 回答
0

你可能需要

DataAdapeter.AcceptChanges()
于 2013-05-24T18:40:36.487 回答
0
//change this line

DataRow daRow = dataRecipe.Tables["CookBookRecipes"].NewRow();

daRow[0] = tbRName.Text;
daRow[1] = listBox1.SelectedItem.ToString();
daRow[2] = tbRCreate.Text;
daRow[3] = tbRIngredient.Text;
daRow[4] = tbRPrep.Text;
daRow[5] = tbRCook.Text;
daRow[6] = tbRDirections.Text;
daRow[7] = tbRYield.Text;
daRow[8] = textBox1.Text;

if (MessageBox.Show("You wish to save your updates?", "Save Updates?", MessageBoxButtons.OKCancel) == DialogResult.OK)
{
//add & change this too
dataRecipe.Tables["CookBookRecipes"].Rows.Add(daRow);
    dataAdapt.Update(dataRecipe, "CookBookRecipes");

    MessageBox.Show("Recipe Updated", "Update");
}

}

于 2015-02-18T13:44:31.367 回答
0

我遇到了同样的问题:用一些新行填充了一个新的数据集,但更新时没有发生任何事情。我使用了类似的 MySqlDataAdapter。

事实证明,当您需要 MySqlCommandBuilder 中的 InsertCommand 时,您必须将行状态指定为已添加。另请参阅:MSDN

于 2013-06-21T19:07:52.923 回答
0

我遇到了同样的问题。我的 dataadapter.fill 有效,但 dataadapter.update 无效。我意识到问题是我的数据库表不包含主键。在我修改我的表以包含一个带有主键的列之后,dataadapter.fill 工作。希望这可以帮助某人。

于 2017-12-15T08:39:40.220 回答
0

如果您正在使用的数据库被添加到您的项目中,它的“复制到输出目录”属性可能会设置为“始终复制”。

如果是,请尝试将其更改为“如果更新则复制”。

我从这里得到了这个解决方案。

于 2021-01-30T22:17:14.973 回答
0

如果您使用的是 Local-DB,请检查数据库的属性。

在“复制到输出目录”属性中设置值“如果较新则复制”,您就可以开始了。

于 2019-09-09T18:06:41.613 回答