Question

我确信有一个非常简单的原因，这一行不起作用，但它在过去一周已经回避了，所以我希望别人会注意到我的错。

我一直在为这个项目工作几个星期到一个月。我一直在使用旧的DataAdapter，CommandBuiler等与1个数据库上的一些linq到sql编码的混合，具有多个Windows应用程序表单。此特定表单使用DataAdapter，Dataset和Command Builder从数据库编辑或删除行。它一直工作正常，直到我切换电脑。现在数据集正在更新，但数据库不是。

以下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，请告诉我们。

Answer 1

为了更新数据库上的数据，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SqlDataAdapter。

在其他世界：介于两者之间

 SqlCommandBuilder cb;
 cb = new SqlCommandBuilder(dataAdapt);

和

 dataAdapt.Update(dataRecipe, "CookBookRecipes");

你需要

dataAdapt.DeleteCommand = cb.GetDeleteCommand(true);
dataAdapt.UpdateCommand = cb.GetUpdateCommand(true);
dataAdapt.InsertCommand = cb.GetInsertCommand(true);

Answer 2

更新的SqlCommand是什么样的？我看到了命令，但是我没有看到任何SqlText，这就是你所缺少的。

您需要在.Update

上设置.UpdateCommand属性来定义SqlDataAdapter所做的事情

此链接提供了很好的细分方法： http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqldataadapter.updatecommand.aspx

Answer 3

在我为Update工作之前添加AcceptChangesDuringUpdate，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);               
        }

Answer 4

您可能需要

DataAdapeter.AcceptChanges()

Answer 5

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

事实证明，当你需要来自MySqlCommandBuilder的InsertCommand时，你必须指定添加的rowstate。另见：MSDN

Answer 6

//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");
}

}

Answer 7

尝试以下来源。

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");
    }
}

Answer 8

我遇到了同样的问题。我的dataadapter.fill有效但dataadapter.update不起作用。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带主键的列之后，dataadapter.fill工作。希望这有助于某人。

Answer 9

如果使用的是本地数据库，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”，您可以使用。

Answer 10

如果您使用的数据库已添加到您的项目中，则其“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 here 那里得到了这个解决方案。

DataAdapter.Update（）不更新数据库

10 个答案: