C# 运行access数据库的更新查询时出错
这是我的代码:C# 运行access数据库的更新查询时出错,c#,C#,这是我的代码: OleDbConnection con = new OleDbConnection("provider=microsoft.jet.oledb.4.0;data source=" + Application.StartupPath + "/shoping mall.mdb"); con.Open(); OleDbCommand cmd = new OleDbCommand("update RecordofItems
OleDbConnection con = new OleDbConnection("provider=microsoft.jet.oledb.4.0;data source=" + Application.StartupPath + "/shoping mall.mdb");
con.Open();
OleDbCommand cmd = new OleDbCommand("update RecordofItems set RecordofItems.Bill_no = " + textBox1.Text + ", RecordofItems.Received_from = '" + textBox62.Text + "', RecordofItems.Item_Code = " + textBox2.Text + ", RecordofItems.Quantity = " + textBox32.Text + ", RecordofItems.Sale_Rate = " + textBox47.Text + " where Item_Name = '" + textBox17.Text + "'", con);
int x = 0;
x = cmd.ExecuteNonQuery();
if (x > 0)
{
MessageBox.Show("record deleted" + x);
}
else
{
MessageBox.Show("no record exixt");
}
con.Close();
我想更新“RecordofItems”表中的选定列,该表有10列,但我只想更新6列,当我运行查询时,它显示错误“一个或多个必需参数无值”该怎么办?请尽快帮助我。错误
一个或多个必需参数没有给定值
通常在您错误放置单个报价时出现
试试这两个
RecordofItems.Bill_no = " + Convert.ToInt32(textBox1.Text) + ",
RecordofItems.Item_Code = " + Convert.ToInt32(textBox2.Text) + ",
RecordofItems.Quantity = " + Convert.ToInt32(textBox32.Text) + ",
RecordofItems.Sale_Rate = " + Convert.ToInt32(textBox47.Text) +
或者使用适用于您的列的任何合适的数字转换器RecordofItems.Received_from = '" + textBox62.Text.Replace("'","''") + "',
另外,请注意,不要通过连接文本框(字符串)来创建sql查询。使用命令参数。它们将使您免于sql注入 您确定列名称正确吗?顺便说一下,您应该使用命令参数。