sql query: make the system to select all where Suppliername is equal to textbox value

Question

3.00/5 (2 votes)

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C#

 private DataSet GetRecords(string TableName)
        { 
SqlCommand cmd = new SqlCommand();
            cmd.Connection = cn;
            cmd.CommandType = CommandType.Text;
            cmd.CommandText = "SELECT * FROM " + TableName;
            SqlDataAdapter da;
            da = new SqlDataAdapter();
            da.SelectCommand = cmd;
            DataSet ds = new DataSet();
            da.Fill(ds, TableName);
            return ds;
}

I want to add:

C#

"WHERE SupplierName= '" + txtsuppliername.text + "'";

How do you place a field name in the given code?

Posted 15-Jul-12 4:06am

wolfsor

Updated 15-Jul-12 4:14am

v3

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Comments

[no name] 15-Jul-12 10:17am

I know how this sounds, but seriously? You went to all this trouble because you could not figure out, cmd.CommandText = "SELECT * FROM " + TableName + " WHERE SupplierName= '" + txtsuppliername.text + "'";? Did you do the least bit of research?

enhzflep 15-Jul-12 10:27am

my +5

wolfsor 15-Jul-12 11:53am

Thank you very much for your help. I don't have enough experience in programming and it gets really frustrating for me to work out these codes. Very much appreciated your help!

2 solutions

Solution 2

C#

private DataSet GetRecords(string TableName)
        { 
 private string sql;
SqlCommand cmd = new SqlCommand();
sql="SELECT * FROM " + TableName + " ";
            cmd.Connection = cn;
            cmd.CommandType = CommandType.Text;
if (txtsuppliername.text!="")
{
sql + = " WHERE SupplierName= '" + txtsuppliername.text + "'" ; 
}
            cmd.CommandText = sql;
            SqlDataAdapter da;
            da = new SqlDataAdapter();
            da.SelectCommand = cmd;
            DataSet ds = new DataSet();
            da.Fill(ds, TableName);
            return ds;
}

Posted 15-Jul-12 20:12pm

Vasim889

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OriginalGriff · Accepted Answer · 2012-07-15T04:45:00

As Wes says - it's pretty obvious! But please, please, don't do it that way! Do not concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Use Parametrized queries instead:

C#

SqlCommand cmd = new SqlCommand();
cmd.Connection = cn;
cmd.CommandType = CommandType.Text;
cmd.CommandText = "SELECT * FROM " + TableName + " WHERE SupplierName=@SN";
cmd.Parameters.AddWithValue("@SN", txtSupplierName.Text);