Insert data into SQL Server from C# code

Question

I have a table student (id, name). Then I have one textbox, for entering the name, when click on submit button, it inserts the data into the database. So how can I insert only to name, not id because id is auto increment?

I tried this

insert into student(id, name) values(,name)

but it is not insert to my table.

This is my code :

protected void Button1_Click(object sender, EventArgs e)
{
    string test = txtName.Text;

    SqlConnection conn = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Person.mdf;Integrated Security=True;User Instance=True");

    string sql = "insert into student(name) values ('test')";

    try
    {
        conn.Open();
        SqlCommand cmd = new SqlCommand(sql, conn);
        cmd.ExecuteNonQuery();
    }
    catch (System.Data.SqlClient.SqlException ex)
    {
        string msg = "Insert Error:";
        msg += ex.Message;
    }
    finally
    {
        conn.Close();
    }
}

Not only that, it gave you a syntax error, probably near ,. If you have code which generates errors, it's normally a good idea to include those error details in full. — MatBailie
– MatBailie, Commented Jun 14, 2012 at 9:28

user1935607 · Accepted Answer · 2013-01-29 18:16:24Z

18

INSERT INTO student (name) values ('name')

Omit the id column altogether, it will be populated automatically. To use your variable, you should parameterise your SQL query.

string sql = "INSERT INTO student (name) values (@name)";
conn.Open();
SqlCommand cmd = new SqlCommand(sql, conn);
cmd.Parameters.Add("@name", SqlDbType.VarChar);
cmd.Parameters["@name"].Value = test;
cmd.ExecuteNonQuery();

You should never attempt to do this by constructing a SQL string containing the input value, as this can expose your code to SQL injection vulnerabilities.

edited Jan 29, 2013 at 18:16

user1935607

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answered Jun 14, 2012 at 9:25

David M

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2 Comments

JaggenSWE Over a year ago

titi Provide more code (the whole shebang that includes the insert and database communications) and we might help you, the SQL statement in itself IS correct as David M displays it.

David M Over a year ago

Is the row not inserted at all, or is it inserted with the value "test" rather than the contents of your text box? Have updated my answer with code to solve the latter...

Damith · Accepted Answer · 2012-06-14 10:04:28Z

2

You better use parameters when you insert data.

try
{
    string sql = "insert into student(name) values (@name)";
    using (SqlConnection conn = new SqlConnection(connectionString))
    {
        conn.Open();
        using (SqlCommand cmd = new SqlCommand(sql, conn))
        {
            cmd.Parameters.AddWithValue("@name", test); // assign value to parameter 
            cmd.ExecuteNonQuery();
        }
    }
}
catch (SqlException ex)
{
    string msg = "Insert Error:";
    msg += ex.Message;
}

edited Jun 14, 2012 at 10:04

answered Jun 14, 2012 at 9:45

Damith

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Comments

Asif Mushtaq · Accepted Answer · 2012-06-14 09:26:02Z

1

You don't need to mention the ID in first part.

insert into student(name) values('name')

answered Jun 14, 2012 at 9:26

Asif Mushtaq

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Comments

2 revs · Accepted Answer · 2013-01-17 08:52:54Z

I was facing this problem and after trying various solution found at stack overflow, i could summarize the experience as follows: commands executed in command shell of mssql like:

insert into table_name (val1,val2,val3,val4) VALUES ("val1","val2",0,"val4")

go

or

insert into table_name VALUES ("val1","val2",0,"val4")

go

work when typed directly in the mssql database prompt,

But when it is required to use the the insert statement from c#, it is required to be kept in mind that string needs to be surrounded by an additional pair of single quites, around the strings, like in:

SqlConnection cnn;

string connetionString = "Data Source=server_name;Initial Catalog=database_name;User ID=User_ID;Password=Pass_word";

cnn = new SqlConnection(connetionString);

SqlCommand myCommand = new SqlCommand("insert into table_name (val1,val2,val3,val4) VALUES ('val1','val2',0,'val4');", cnn);

//or
//SqlCommand myCommand = new SqlCommand(insert into table_name VALUES ('val1','val2',0,'val4');", cnn);

cnn.Open();

myCommand.ExecuteNonQuery();

cnn.Close();

the problem here is that most people, like myself, try to use <\"> in the place of double quotes <">that is implemented as in the above command line case, and SQL executor fails to understand the meaning of this.

Even in cases where a string needs to be replace, ensure that strings are surrounded by single quotation, where a string concatination looks like a feasible solution, like in:

SqlCommand myCommand = new SqlCommand("insert into table_name (val1,val2,val3,val4) VALUES ('"+val1+"','val2',0,'val4');", cnn);

Etienne · Accepted Answer · 2017-06-06 14:32:00Z

1

string sql = "INSERT INTO student (name) values (@name)";
conn.Open();
SqlCommand cmd = new SqlCommand(sql, conn);
cmd.Parameters.Add("@name", SqlDbType.VarChar);
cmd.Parameters["@name"].Value = test;
cmd.ExecuteNonQuery();

edited Jun 6, 2017 at 14:32

Etienne

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answered Jun 14, 2012 at 11:06

Nikhil D

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Comments

Rajesh Subramanian · Accepted Answer · 2012-06-14 09:26:50Z

0

Try the following query,

insert into student(name) values(name)

SQL Server internally auto increments the id column when u insert the data since u said it is auto increment. If it is not working, the u have to check the identity column in the db.

answered Jun 14, 2012 at 9:26

Rajesh Subramanian

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Comments

Ram · Accepted Answer · 2013-10-22 09:11:49Z

0

use the key word "identity" to auto increment the id column

Refer : http://technet.microsoft.com/en-us/library/aa933196(v=sql.80).aspx

create table table_name( id int PRIMARY KEY IDENTITY )

and you no need to mention the "id" in the insert query

edited Oct 22, 2013 at 9:11

answered Oct 22, 2013 at 9:06

Ram

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