Cant add data to the database

Question

0.00/5 (No votes)

See more:

Hello all,

I am working on a console project. I created a class named 'worker' and wrote some properties such as 'name,lastname,age' with set&get methods.

Under the main I created 2 new workers. But I can not add them to the database. I am stuck and cant go furter. I would be really glad if you help me.

The code is;

Worker Andrew = new Worker();
           Andrew.Name = "Andrew";
           Andrew.HairColor = Color.Black;


Worker Steve = new Worker();
           Steve.Name = "Steve";
           Steve.HairColor = Color.Brown;

           //Connection string for the database
           MySqlConnection conn = new MySqlConnection("Server=localhost;Database=mydatabase;UID=root;PASSWORD=123456789;pooling=false");
           MySqlCommand cmd = conn.CreateCommand();

           cmd.Connection = conn;

           cmd.CommandText = "insert into workerdetails (Name, HairColor) values (@name1, @color1)";
           cmd.Parameters.AddWithValue("@name1", Andrew.Name);
           cmd.Parameters.AddWithValue("@color1", Andrew.HairColor);

           cmd.CommandText = "insert into workerdetails (Name, HairColor) values (@name2, @color2)";
           cmd.Parameters.AddWithValue("@name2", Steve.Name);
           cmd.Parameters.AddWithValue("@color2", Steve.MouseColor);


           conn.Open();

           //MySqlDataReader reader = cmd.ExecuteReader();
           //cmd.ExecuteReader();
           cmd.ExecuteNonQuery();
           conn.Close();

Posted 31-Jul-10 5:21am

wonder-FOOL

Updated 31-Jul-10 5:27am

Abhinav S

v2

Add a Solution

3 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

E.F. Nijboer · Answer 1 · 2010-07-31T05:50:00

Solution 1

Would it work when placed in the main thread?

Doesn't Steve.MouseColor need some casting?

Good luck!

Posted 31-Jul-10 5:50am

E.F. Nijboer

afshin.b.k · Answer 2 · 2010-07-31T09:14:00

private void btnAdd_Click(object sender, EventArgs e)
{
string tbl = "students";
string sqlStr = string.Concat("SELECT * FROM ", tbl);

try
{
OleDbConnection cnn = new OleDbConnection(cnnStr);
OleDbDataAdapter oda = new OleDbDataAdapter(sqlStr, cnn);
OleDbCommandBuilder ocb = new OleDbCommandBuilder(oda);

cnn.Open();

// must appear after cnn.open
OleDbCommand cmd = new OleDbCommand(sqlStr, cnn);
OleDbDataReader drr = cmd.ExecuteReader();
///////

DataSet ds = new DataSet();
DataTable dt = new DataTable();
DataRow dr;

bool duplicate = false;

while (drr.Read())
{
if (drr["id"].ToString().Trim() == txtIDAdd.Text.Trim())
{
duplicate = true;
break;
}
}

if (!duplicate)
{
ocb.QuotePrefix = "[";
ocb.QuoteSuffix = "]";
oda.Fill(ds, tbl);

dt = ds.Tables[tbl];
dr = dt.NewRow();

/*dr[0] = txtIDAdd.Text.Trim();
dr[1] = txtNameAdd.Text.Trim();
dr[2] = txtMarkAdd.Text.Trim();*/
dr["id"] = txtIDAdd.Text.Trim();
dr["studentname"] = txtNameAdd.Text.Trim();
dr["mark"] = Convert.ToByte(txtMarkAdd.Text.Trim());
dt.Rows.Add(dr);

oda.InsertCommand = ocb.GetInsertCommand();

if (oda.Update(ds, tbl) == 1)
{
ds.AcceptChanges();
MessageBox.Show("Added");
}
else
{
ds.RejectChanges();
MessageBox.Show("Rejected");
}
}
else
MessageBox.Show("Already Exist");

drr.Close();
cnn.Close();

dt.Dispose();
ds.Dispose();
drr.Dispose();
cmd.Dispose();
ocb.Dispose();
oda.Dispose();
cnn.Dispose();

dt = null;
ds = null;
drr = null;
cmd = null;
ocb = null;
oda = null;
cnn = null;
}
catch (Exception ex)
{
MessageBox.Show("Error:\n\t" + ex.Message);
}
finally
{
}

its a way ..if u use in sql ,just change "OLedb"with "sql" try it

wonder-FOOL · Answer 3 · 2010-07-31T12:27:00

Thanks for the replies. I fixed it by adding two workers to a list and by using for loop I added them to the database. code goes by:

for (int i = 0; i < worker.Count; i++)
{
MySqlCommand cmd = new MySqlCommand("insert into workerdetails (Name, HairColor) values (@name, @color)", conn);

cmd.Parameters.AddWithValue("@name", worker[i].Name);
cmd.Parameters.AddWithValue("@color", worker[i].HairColor);

conn.Open();
cmd.ExecuteNonQuery();
cmd.Dispose();
conn.Close();
}

Cant add data to the database

3 solutions

Solution 1

Solution 2

Solution 3

Add your solution here

Preview 0