我是一个初学者,试图用C#创建一个简单的程序来插入和更新Oracle数据库中的记录.我已经成功地连接到数据库,但是我的SQL语句出现异常,该异常指出不支持(？)符号.为什么会出现此异常,该如何解决？
我的代码是：
private void btnSave_Click(object sender, EventArgs e)
{
OracleConnection con = null;
try
{
con = new OracleConnection();
string constr = "Data source=XE; User ID=cloudester; Password=cloudester123;";
if (con.State != ConnectionState.Open)
{
try
{
con.ConnectionString = constr;
con.Open();
//MessageBox.Show("Successfull connection");
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Exception caught");
}
}
if (con.State == ConnectionState.Open)
{
string str = "Insert into EMP_DETAIL(EmpId, Name, Age)";
str += "values (?,?,?)";
OracleCommand cmd = new OracleCommand();
mandText = Text;
cmd.Connection = con;
cmd.Parameters.Add(new OracleParameter("EmpId", OracleDbType.Varchar2)).Value = txtEmpId;
cmd.Parameters.Add(new OracleParameter("Name", OracleDbType.Varchar2)).Value = txtName;
cmd.Parameters.Add(new OracleParameter("Age", OracleDbType.Int16)).Value = int.Parse(txtAge.Text);
cmd.ExecuteNonQuery();
}
}
catch { ... }
}
解决方法:
您需要为命令使用named参数
string str = "Insert into EMP_DETAIL(EmpId, Name, Age) values (:EmpId, :Name, :Age)";
OracleCommand cmd = new OracleCommand();
mandText = str; //mandText = Text; not sure why did you use Text here
cmd.Connection = con;
cmd.Parameters.Add(new OracleParameter("EmpId", OracleDbType.Varchar2)).Value = txtEmpId;
cmd.Parameters.Add(new OracleParameter("Name", OracleDbType.Varchar2)).Value = txtName;
cmd.Parameters.Add(new OracleParameter("Age", OracleDbType.Int16)).Value = int.Parse(txtAge.Text);
cmd.ExecuteNonQuery();
标签：query-parameters,oracle,sql-insert,c
来源： https://codeday.me/bug/1028/1952377.html
