[英]Updating my database won't work because of incorrect syntax for MySql
I am trying to update my database but then this error about my syntax shows up我正在尝试更新我的数据库,但随后出现了这个关于我的语法的错误
MySql.Data.MySqlClient.MySqlException: 'You have an error in your SQL syntax; MySql.Data.MySqlClient.MySqlException:'您的 SQL 语法有错误; check the manual that corresponds to your MySQL server version for the right syntax to use near '(platenumber,brand,model,yearmodel,regdate,exdate,odometer) set id = '1' values(' at line 1'查看与您的 MySQL 服务器版本相对应的手册,了解在“(车牌号、品牌、model、年份模型、regdate、exdate、里程表)附近使用的正确语法设置 id = '1' values(' at line 1'
I am not too familiar with MySQl but I got rid of all the errors it showed here in my code我对 MySQl 不太熟悉,但我摆脱了它在我的代码中显示的所有错误
private void savebtn_Click(object sender, EventArgs e)
{
string ID = idtxt.Text;
MySqlCommand cmd = new MySqlCommand("update inventory.vehicle(platenumber,brand,model,yearmodel,regdate,exdate,odometer) set id = '" + this.idtxt.Text + "' values(@platenumber, @brand, @model,@yearmodel, @regdate, @exdate,@odometer) where id = '"+ this.idtxt.Text +"'", conn);
cmd.Parameters.Add("@platenumber", MySqlDbType.VarChar, 10).Value = pnumber.Text;
cmd.Parameters.Add("@brand", MySqlDbType.VarChar, 60).Value = brand.Text;
cmd.Parameters.Add("@model", MySqlDbType.VarChar, 45).Value = model.Text;
cmd.Parameters.Add("@yearmodel", MySqlDbType.Int32).Value = yearmodel.Text;
cmd.Parameters.Add("@regdate", MySqlDbType.Date).Value = datereg.MinDate;
cmd.Parameters.Add("@exdate", MySqlDbType.Date).Value = regexp.MinDate;
cmd.Parameters.Add("@odometer", MySqlDbType.Decimal).Value = odometer.Text;
int i = cmd.ExecuteNonQuery();
if (i != 0)
{
MessageBox.Show("Success");
}
else
{
MessageBox.Show("Fail");
}
this.Close();
}
what could be causing this error?什么可能导致此错误?
As stated in the error, your query is wrong如错误中所述,您的查询是错误的
MySqlCommand cmd = new MySqlCommand(
"update inventory.vehicle
(platenumber,brand,model,yearmodel,regdate,exdate,odometer)
set id = '" + this.idtxt.Text + "'
values(@platenumber, @brand, @model,@yearmodel, @regdate, @exdate,@odometer)
where id = '"+ this.idtxt.Text +"'", conn);
mustn't have values
part and should look like不能有values
部分,应该看起来像
UPDATE inventory.vehicle SET
platenumber=@platenumber,
brand=@brand
model=@model,
....
WHERE id = @id
Don't ever use string join inside a query, but use parameters instead for two main reasons:永远不要在查询中使用字符串连接,而是使用参数,主要有两个原因:
So even WHERE id=
part must use a parameter!所以即使WHERE id=
部分也必须使用参数!
You have problem in the query, the UPDATE
statement should be in this format.您的查询有问题, UPDATE
语句应该是这种格式。
UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;
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