[英]C# Syntax error (missing operator) in query expression
我在cmd.ExecuteNonQuery()
上收到此錯誤...我認為在cmd.CommandText
上我錯了...
查詢表達式'Nr_Crt ='1'和Varsta'3'和KG'2'以及Specie'Iepure'和Risc'Nu'和Tip1'Diurn'和Tip2'Carnivor'的語法錯誤(缺少運算符)。
private void button2_Click_1(object sender, EventArgs e)
{
if (txtNr_Crt.Text != " " & txtVarsta.Text != " " & txtKG.Text != " " & txtSpecie.Text != " " & txtRisc.Text != " " & txtTip1.Text != " " & txtTip1.Text != " " & txtTip2.Text != "")
{
cn.Open();
cmd.CommandText = "DELETE from Animale Where Nr_Crt='" + txtNr_Crt.Text + "' and Varsta '" + txtVarsta.Text + "' and KG '" + txtKG.Text + "' and Specie '" + txtSpecie.Text + "' and Risc'" + txtRisc.Text + "' and Tip1 '" + txtTip1.Text + "' and Tip2 '" + txtTip2.Text + "'";
cmd.ExecuteNonQuery();
cn.Close();
loaddata();
txtNr_Crt.Text = "";
txtVarsta.Text = "";
txtKG.Text = "";
txtSpecie.Text = "";
txtSex.Text = "";
txtRisc.Text = "";
txtTip1.Text = "";
txtTip2.Text = "";
}
}
您的代碼容易受到SQL注入的攻擊,我會解決此問題。
問題是您在每個后繼and
都缺少=
:
cn.Open();
cmd.Parameters.AddWithValue("@Nr_Crt", txtNr_Crt.Text);
cmd.Parameters.AddWithValue("@Varsta", txtVarsta.Text);
cmd.Parameters.AddWithValue("@KG", txtKG.Text);
cmd.Parameters.AddWithValue("@Specie", txtSpecie.Text);
cmd.Parameters.AddWithValue("@Risc", txtRisc.Text);
cmd.Parameters.AddWithValue("@Tip1", txtTip1.Text);
cmd.Parameters.AddWithValue("@Tip2", txtTip2.Text);
cmd.CommandText = "DELETE from Animale Where Nr_Crt= @Nr_Crt and Varsta = @Varsta and KG = @KG and Specie = @Specie and Risc = @Risc and Tip1 = @Tip1 and Tip2 = @Tip2";
cmd.ExecuteNonQuery();
cn.Close();
這應該可以解決(以及SQL注入風險)
您的查詢是錯誤的。 您缺少=
比較列時
cmd.CommandText = "DELETE from Animale Where Nr_Crt='" + txtNr_Crt.Text + "' and Varsta='" + txtVarsta.Text + "' and KG='" + txtKG.Text + "' and Specie='" + txtSpecie.Text + "' and Risc='" + txtRisc.Text + "' and Tip1='" + txtTip1.Text + "' and Tip2='" + txtTip2.Text + "'";
foreach(Control ctrl in this.Controls)
{
if (ctrl is TextBox)
{
ctrl.text="";
}
}
為了一次清理所有文本框:),您可以創建一個在需要時執行該方法的方法
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