c# - Why does cmd.executeNonQuery() throw ManagedDataAccess.Client.OracleException?

Question

I tried to write this very simple code to find the problem without any variables, but I can't. If I copy the same query in the sqldeveloper it works. The ServerVersion still shows up correctly in the messagebox.

The function is called like: new Dal().testCon();

public OracleConnection con;

public Dal()
{
    con = new OracleConnection();
    con.ConnectionString = "User Id=satan;Password=666;Data Source=MyDB";
}

public void testCon()
{
    con.Open();
    MessageBox.Show(con.ServerVersion);
    OracleCommand cmd = new OracleCommand("insert into myuser values(1,'Pornstar','xxx',18);", con);
    cmd.ExecuteNonQuery();
    con.Close();
}

Answer 1

该错误是由在 SQL 中包含分号引起的。将您的查询字符串更改为"insert into myuser values(1,'Pornstar','xxx',18)".

我还建议将连接移到testCon方法中，如下所示：

private const string ConnectionString = "User Id=satan;Password=666;Data Source=MyDB";

public Dal()
{
}

public void testCon()
{
    using (OracleConnection connection = new OracleConnection(ConnectionString))
    {
        OracleCommand cmd = new OracleCommand("insert into myuser values(1,'Pornstar','xxx',18)", connection);
        cmd.Connection.Open();
        MessageBox.Show(connection.ServerVersion);
        cmd.ExecuteNonQuery();
    }
}