[英]data-type-mismatch-in-criteria-expression-error when delete from MS Access with ADO.NET C#
我寫的代碼可以使用Microsoft Access數據庫插入和刪除一些數據,我可以插入數據,但是當我刪除它時,我出現錯誤“數據類型不匹配的條件表達式”,我不知道為什么! 有人幫我嗎?
提前致謝 ;
private void Savebt_Click(object sender, EventArgs e)
{
//try
//{
OleDbConnection conn = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:\me\Library Store\Library Store\Store.accdb");
try
{
conn.Open();
OleDbCommand cmd = new OleDbCommand();
cmd.Connection = conn;
cmd.CommandText = "INSERT INTO Libarary ( ISBN, [Name], Gategory, Author, Cost, [Date]) " +
"VALUES ( @ISBN, @Name, @Gategory, @Author, @Cost, @Date) ";
cmd.Parameters.AddWithValue("@ISBN", ISBNTB.Text);
cmd.Parameters.AddWithValue("@Name", NameTB.Text);
cmd.Parameters.AddWithValue("@Gategory", GategoryTB.Text);
cmd.Parameters.AddWithValue("@Author", AuthorTB.Text);
cmd.Parameters.AddWithValue("@Cost", int.Parse(CostTB.Text));
cmd.Parameters.AddWithValue("@Date", dateTimePicker1.Text);
cmd.ExecuteNonQuery();
MessageBox.Show("Book Added!");
conn.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
private void sellbt_Click(object sender, EventArgs e)
{
OleDbConnection conn = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:\me\Library Store\Library Store\Store.accdb");
try
{
conn.Open();
OleDbCommand cmd = new OleDbCommand();
cmd.Connection = conn;
cmd.CommandText = " DELETE * FROM Libarary WHERE ISBN=@ISBN AND [Name]=@Name AND Gategory=@Gategory AND Author=@Author AND Cost=@Cost AND [Date]=@Date ";
cmd.Parameters.AddWithValue("@ISBN", ISBNTB.Text);
cmd.Parameters.AddWithValue("@Name", NameTB.Text);
cmd.Parameters.AddWithValue("@Gategory", GategoryTB.Text);
cmd.Parameters.AddWithValue("@Author", AuthorTB.Text);
cmd.Parameters.AddWithValue("@Cost", CostTB.Text);
cmd.Parameters.AddWithValue("@Date", dateTimePicker1.Text);
cmd.ExecuteNonQuery();
MessageBox.Show("Book removed to be sold!");
conn.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
用我嘗試刪除的記錄出錯
數據庫記錄
之所以遇到此錯誤,是因為要傳遞給查詢的一個/許多參數與數據庫中的參數類型不同。 交叉檢查。 理想情況下應該像這樣將參數傳遞給您的查詢
cmd.Parameters.Add("@Date", OleDbType.Date); //note i have specified the db type
cmd.Parameters["@Date"].Value =dateTimePicker1.Value;
這將確保您具有與數據庫中定義的類型相同的類型
嘗試:
cmd.Parameters.AddWithValue("@Date", dateTimePicker1.Value);
DateTimePicker.Text
返回所選值的字符串表示形式,而不是值本身。
怎么樣?
cmd.Parameters.AddWithValue("@Date", dateTimePicker1.Value.ToString("dd-MM-yyyy"));
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