查询表达式';中存在语法错误(缺少运算符);[代码]IN(';
本文关键字:运算符 IN 代码 错误 表达式 查询表 存在 查询 语法 | 更新日期: 2023-09-27 18:29:11
我在更新数据时遇到错误,错误显示:"查询表达式'[Code]in('中的语法错误(缺少运算符)。"
这是我在上出错的代码
OleDbDataReader dReader = cmd.ExecuteReader();
以下是出现错误的功能的完整代码:
private void UpdateQuantity()
{
int index = 0;
string command = "UPDATE [Seranne] SET [Quantity] ='" + newVal + "' WHERE [Code] IN(";
OleDbConnection conn = new OleDbConnection(connectionString);
conn.Open();
OleDbCommand cmd = new OleDbCommand(command, conn);
cmd.Parameters.Add("Quantity", System.Data.OleDb.OleDbType.Integer);
OleDbDataReader dReader = cmd.ExecuteReader();
while (dReader.Read())
{
if (textBoxQuantityContainer[index].Value != 0 && textBoxQuantityContainer[index].Value >= Convert.ToDecimal(dReader["Quantity"].ToString()))
{
newVal = Convert.ToDecimal(dReader["Quantity"].ToString()) - textBoxQuantityContainer[index].Value;
}
System.Media.SoundPlayer sound = new System.Media.SoundPlayer(@"C:'Windows'Media'Windows Notify.wav");
sound.Play();
MessageBox.Show("Updated Successfully", "Success");
index += 1;
}
conn.Close();
dReader.Close();
}
这是前面的代码,其中的查询表达式"code IN":
string query = "SELECT [Quantity], [Description], [Price] FROM [Seranne] WHERE [Code] IN (";
OleDbConnection conn = new OleDbConnection(connectionString);
conn.Open();
if (int.TryParse(this.textBoxCodeContainer[0].Text, out codeValue))
{
query = query + codeValue.ToString();
}
for (int i = 1; i < 17; i++)
{
if (int.TryParse(this.textBoxCodeContainer[i].Text, out codeValue))
{
query = query + "," + codeValue.ToString();
}
}
query = query + ")";
OleDbCommand cmd = new OleDbCommand(query, conn);
cmd.Parameters.Add("Code", System.Data.OleDb.OleDbType.Integer);
cmd.Parameters.Add("Quantity", System.Data.OleDb.OleDbType.Integer);
OleDbDataReader dReader;
dReader = cmd.ExecuteReader();
while (dReader.Read())
{
if (textBoxCodeContainer[index].TextLength != 0)
{
this.textBoxQuantityContainer[index].Maximum = Convert.ToDecimal(dReader["Quantity"].ToString());
this.textBoxDescContainer[index].Text = dReader["Description"].ToString();
this.textBoxSubTotalContainer[index].Text = dReader["Price"].ToString();
}
index += 1;
}
conn.Close();
dReader.Close();
谢谢大家!
好的,只需保留您的代码并更改它:
for (int i = 1; i < 17; i++) {
if (int.TryParse(this.textBoxCodeContainer[i].Text, out codeValue))
{
query = query + codeValue + ",";
}
}
query = query.TrimEnd(',') + ")";
在继续之前,最好用textBoxCodeContainer值创建整数列表,称为整数
然后
string command = "UPDATE [Seranne] SET [Quantity] =? WHERE [Code] IN(" + string.Join(", " , integers) +")";
生成如下的整数列表
List<int> integers = new List<int>();
foreach (var tb in textBoxCodeContainer)
{
int codeValue;
if (int.TryParse(tb.Text, out codeValue))
{
integers.Add(codeValue);
}
}