Creating and Calling Stored Procedures using MySQL and C# ASPNET

Creating and Calling Stored Procedures using MySQL and C# ASPNET - c#

I want creating stored procedures in MySql using the OdbcCommand class.
After the stored procedure is named, I define one OdbcCommand parameter for every parameter in the stored procedure.
IN parameters are defined with the parameter name and the object containing the value, OUT parameters are defined with the parameter name and the data type that is expected to be returned.
All parameters need the parameter direction defined.
The following C# code it's my test.
The SP it's created correctly but I have error on
ERROR [42000] [MySQL][ODBC 5.1 Driver][mysqld-5.1.51-community] You
have an error in your SQL syntax; check the manual that corresponds
to your MySQL server version for the right syntax to use near
'add_emp' at line 1
On this part of C# code
try
{
conn.Open();
cmd.Connection = conn;
cmd.CommandText = "add_emp;";
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("#tname", "Jones");
cmd.Parameters["#tname"].Direction = ParameterDirection.Input;
cmd.Parameters.Add("#empno", OdbcType.Int);
cmd.Parameters["#empno"].Direction = ParameterDirection.Output;
cmd.ExecuteNonQuery(); <<< Line of error
Response.Write("Employee exists: " + cmd.Parameters["#empno"].Value);
}
catch (Exception ex)
{
throw ex;
}
Any suggestion?
using (OdbcConnection conn =
new OdbcConnection(ConfigurationManager.ConnectionStrings["conn"].ConnectionString))
{
OdbcCommand cmd = new OdbcCommand();
try
{
conn.Open();
cmd.Connection = conn;
cmd.CommandText = "DROP PROCEDURE IF EXISTS add_emp";
cmd.ExecuteNonQuery();
cmd.CommandText = "CREATE PROCEDURE add_emp(" +
"IN tname VARCHAR(255), OUT empno INT)" +
"BEGIN SELECT EXISTS( SELECT empo FROM do_table WHERE name = tname ) INTO #titem_id; " +
"SET empno = #titem_id; END";
cmd.ExecuteNonQuery();
}
catch (Exception ex)
{
throw ex;
}
conn.Close();
try
{
conn.Open();
cmd.Connection = conn;
cmd.CommandText = "add_emp;";
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("#tname", "Jones");
cmd.Parameters["#tname"].Direction = ParameterDirection.Input;
cmd.Parameters.Add("#empno", OdbcType.Int);
cmd.Parameters["#empno"].Direction = ParameterDirection.Output;
cmd.ExecuteNonQuery();
Response.Write("Employee exists: " + cmd.Parameters["#empno"].Value);
}
catch (Exception ex)
{
throw ex;
}
conn.Close();
}

Related

Insert in c# using npgsql

When I'm trying to execute an insert query with npgsqlcommand to postgres in c#, the execution of the program is suspend to cmd.ExecuteNonQuery();
Here's my code
public void Insert(Mouvement mvt)
{
NpgsqlConnection conn = null;
NpgsqlCommand cmd = null;
try
{
conn = UtilDB.GetConnection();
String sql = "INSERT INTO MOUVEMENT(ID_AERONEF,ID_PF,ID_ESCALE,DATE,SENS,NVOL,PISTE,BLOC,PAXC,PAXY,PAXBB,PAXEXO," +
"TRANSITDIRECT,TRANSITRI,TRANSITRRLC,CONTINU,PN,FRETPAYANT,FRETGRATUIT,BAGAGE,POSTE,MODE,BALISAGE,OBSERVATION) "+
"VALUES (:id_aeronef,:id_pf,:id_escale,:date,:sens,:nvol,:piste,:bloc,:paxc,:paxy,:paxbb,:paxexo," +
":transitdirect,:transitri,:transitrrlc,:continu,:pn,:fretpayant,:fretgratuit,:bagage,:poste,:mode,:balisage,:observation)";
conn.Open();
cmd = new NpgsqlCommand(sql, conn);
cmd.Parameters.Add("id_aeronef", mvt.Aeronef.Id);
cmd.Parameters.Add("id_pf", mvt.Plateforme.Id);
cmd.Parameters.Add("id_escale", mvt.Escale.Id);
cmd.Parameters.Add("date", mvt.Date);
cmd.Parameters.Add("sens", mvt.Sens);
cmd.Parameters.Add("nvol", mvt.Nvol);
cmd.Parameters.Add("piste", mvt.Piste);
cmd.Parameters.Add("bloc", mvt.Bloc);
cmd.Parameters.Add("paxc", mvt.PaxC);
cmd.Parameters.Add("paxy", mvt.PaxY);
cmd.Parameters.Add("paxbb", mvt.PaxBB);
cmd.Parameters.Add("paxexo", mvt.PaxExo);
cmd.Parameters.Add("transitdirect", mvt.TransitDirect);
cmd.Parameters.Add("transitri", mvt.TransitRI);
cmd.Parameters.Add("transitrrlc", mvt.TransitRRLC);
cmd.Parameters.Add("continu", mvt.Continu);
cmd.Parameters.Add("pn", mvt.Pn);
cmd.Parameters.Add("fretpayant", mvt.FretPayant);
cmd.Parameters.Add("fretgratuit", mvt.FretGratuit);
cmd.Parameters.Add("bagage", mvt.Bagage);
cmd.Parameters.Add("poste", mvt.Poste);
cmd.Parameters.Add("mode", mvt.Mode);
cmd.Parameters.Add("balisage", mvt.Balisage);
cmd.Parameters.Add("observation", mvt.Observation);
cmd.Prepare();
cmd.CommandType = CommandType.Text;
cmd.ExecuteNonQuery();
}
catch (Exception ex)
{
throw ex;
}
finally
{
if(cmd!=null) cmd.Dispose();
if(conn!=null) conn.Close();
}
}

Finally, it was a problem of type: I have character(1) in database but String(10) in C#

"Procedure or function expects parameter which was not supplied."

I'm trying to execute a stored procedure and print the output, but when I run the below code I'm getting error like "Procedure or function 'SPInsertLocal' expects parameter '#RES', which was not supplied."
private void InsertPdtLocal(string code, string PON,string Qty)
{
string str = Properties.Settings.Default.conLocal;
SqlConnection con = new SqlConnection(str);
SqlCommand cmd = new SqlCommand("Execute SPInsertLocal #PON,#TCode,#Qty,#Type", con);
try
{
con.Open();
cmd.CommandTimeout = 150;
cmd.Parameters.AddWithValue("#PON", PON);
cmd.Parameters.AddWithValue("#Qty", Qty);
cmd.Parameters.AddWithValue("#TCode", code);
cmd.Parameters.AddWithValue("#Type", Globals.s_type);
SqlParameter output = new SqlParameter("#RES", SqlDbType.Int);
output.Direction = ParameterDirection.Output;
cmd.Parameters.Add(output);
cmd.ExecuteNonQuery();
con.Close();
int id = Convert.ToInt32(output.Value);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
What I'm doing wrong here?

SqlCommand cmd = new SqlCommand("Execute SPInsertLocal #PON,#TCode,#Qty,#Type,#RES", con);
I was not passing the parameter , fixed the issue

You can refactor the code as follows where the using statement is used for the auto management of connection closing and avoid hardcoding Execute statement in c# code which is a bad practice
private void InsertPdtLocal(string code, string PON,string Qty)
{
string str = Properties.Settings.Default.conLocal;
try
{
using (SqlConnection con = new SqlConnection(str))
{
using (SqlCommand cmd = con.CreateCommand())
{
cmd.Parameters.AddWithValue("#PON", PON);
cmd.Parameters.AddWithValue("#Qty", Qty);
cmd.Parameters.AddWithValue("#TCode", code);
cmd.Parameters.AddWithValue("#Type", Globals.s_type);
var output = cmd.Parameters.Add("#RES" , SqlDbType.Int);
output.Direction = ParameterDirection.Output;
cmd.ExecuteNonQuery();
int id = Convert.ToInt32(output.Value);
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}

Local Database Insert query does nothing

I am trying to insert a row into the database. Below is my query:
using (SqlConnection conn = new SqlConnection("Data Source = (LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\Traindata.mdf;Integrated Security=True"))
{
string query = "INSERT INTO dbo.Station (Naam, X, Y, Sporen) VALUES (#naam, #x, #y, #sporen)";
using (SqlCommand command = new SqlCommand(query, conn))
{
command.Parameters.AddWithValue("#naam", insert[1]);
command.Parameters.AddWithValue("#x", insert[2]);
command.Parameters.AddWithValue("#y", insert[3]);
command.Parameters.AddWithValue("#sporen", insert[4]);
conn.Open();
try
{
command.ExecuteNonQuery();
}
catch (SqlException exc)
{
Console.WriteLine("Error to save on database");
Console.WriteLine(exc.Message);
}
conn.Close();
}
}
When I run it nothing happens (Also no SQL errors). What am I doing wrong? I am sorry if this is a stupid question, I am merely a beginner.
This should work (I have tested this with a select query that does work).

Have you tried storing the query on a stored procedure and calling it from C#? ... Thats actually easier than making the query via hard code inside the C# code ... Just create a stored procedure that does whatever you want it to do, then call it from C# and add the parameters. It should look something like this:
SqlConnection con = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["Your_Conection_String_s_Name"].ConnectionString);
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;
cmd.CommandText = "dbo.Your_Stored_Procedure";
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add("#Input_Param_1", SqlDbType.VarChar, 18).Value = "C#_Parameter1";
cmd.Parameters.Add("#Input_Param_2", SqlDbType.VarChar, 45).Value = "C#Parameter_2";
cmd.Parameters.Add("#Input_Param_3", SqlDbType.VarChar, 45).Value = "C#Parameter_3";
cmd.Parameters.Add("#Input_Param_4", SqlDbType.Text).Value = "C#Parameter_4";
cmd.Parameters.Add("#Input_Param_5", SqlDbType.VarChar, 45).Value = "C#Parameter_5";
cmd.Parameters.Add("#Output_Parameter_1", SqlDbType.VarChar, 250).Direction = ParameterDirection.Output;
cmd.Parameters.Add("#Output_Parameter_2", SqlDbType.DateTime).Direction = ParameterDirection.Output;
con.Open();
cmd.ExecuteNonQuery();
con.Close();
"C#Output_Parameter_1" = "" + cmd.Parameters["#Output_Parameter_1"].Value;
"C#Output_Parameter_2" = "" + cmd.Parameters["#Output_Parameter_2"].Value;
Hope it helps.

My guess is that you have a type mismatch
If x, y are not int then substitute in the correct type
using (SqlConnection conn = new SqlConnection("Data Source = (LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\Traindata.mdf;Integrated Security=True"))
{
using (SqlCommand command = SqlCommand.CreateCommand())
{
try
{
conn.Open();
command.Query = "select count(*) from dbo.Station";
Int32 rowsRet = (Int32)command.ExecuteScalar();
Console.WriteLine(rowsRet.ToString());
command.Query = "INSERT INTO dbo.Station (Naam, X, Y, Sporen) VALUES (#naam, #x, #y, #sporen)";
command.Parameters.AddWithValue("#naam", insert[1]);
command.Parameters.Add("#x", SqlDbType.Int);
command.Parameters["#x"].Value = Int32.Parse(insert[2]);
command.Parameters.Add("#y", SqlDbType.Int);
command.Parameters["#y"].Value = Int32.Parse(insert[3]);
command.Parameters.AddWithValue("#sporen", insert[4]);
rowsRet = command.ExecuteNonQuery();
Console.WriteLine(rowsRet.ToString());
command.Query = "select count(*) from dbo.Station";
Int32 rowsRet = (Int32)command.ExecuteScalar();
Console.WriteLine(rowsRet.ToString());
}
catch (SqlException exc)
{
Console.WriteLine("Error to save on database");
Console.WriteLine(exc.Message);
}
finally
{
conn.Close();
}
// op claims the insert is gone the next time the programs is run
try
{
conn.Open();
command.Query = "select count(*) from dbo.Station";
Int32 rowsRet = (Int32)command.ExecuteScalar();
Console.WriteLine(rowsRet.ToString());
}
catch (SqlException exc)
{
Console.WriteLine("Error to save on database");
Console.WriteLine(exc.Message);
}
finally
{
conn.Close();
}
}
}

The name '"' does not exist in the current context

I am facing several errors in my code. These errors are:
Error 17 The name 'CommandType' does not exist in the current context
Error 18 The name 'SqlDbType' does not exist in the current context
Error 35 The name 'txtCity' does not exist in the current context
I would like if you can help me to understand the error and tell me how I can fix it.
protected void btnSave_Click(object sender, EventArgs e)
{
// create connectionstring and insert statment
string connectionString = ConfigurationManager.ConnectionStrings["connectionString"].ConnectionString;
string insertSql = " INSERT INTO UserInfo (UID, FN, LN, Password, RePass, Email, Country,State, City)" +
" values (#UsrNme, #fnbox, #lnamebox, #passtxtbx1, #passtxtbx2, #emailbox, #DrDncoundrlst, #DropDownListSwestate, #citytxtbox)";
// create SQL Connection
SqlConnection con = new SqlConnection(connectionString);
// create sql command and parameters
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;
cmd.CommandType = CommandType.text;
cmd.CommandText = insertSql;
SqlParameter UID = new SqlParameter("#UsrNme", SqlDbType.nvarchar, 50);
UID.Value = txtUID.text.tostring();
cmd.Parameters.Add(UID);
SqlParameter FN = new SqlParameter("#fnbox", SqlDbType.varchar,25);
cmd.Connection = con;
FN.Value = txtfn.text.ToString();
cmd.Parameters.Add(FN);
SqlParameter LN = new SqlParameter("#lnamebox", SqlDbType.varchar, 25);
cmd.Connection = con;
LN.Value = txtLN.text.ToString();
cmd.Parameters.Add(LN);
SqlParameter Password = new SqlParameter("#passtxtbx1", SqlDbType.varchar, 25);
cmd.Connection = con;
Password.Value = txtPassword.text.ToString();
cmd.Parameters.Add(Password);
SqlParameter RePass = new SqlParameter("#passtxtbx2", SqlDbType.varchar, 25);
cmd.Connection = con;
RePass.Value = txtRePass.text.ToString();
cmd.Parameters.Add(RePass);
SqlParameter Email = new SqlParameter("#emailbox", SqlDbType.varchar, 25);
cmd.Connection = con;
Email.Value = txtEmail.text.ToString();
cmd.Parameters.Add(Email);
SqlParameter Country = new SqlParameter("#DrDncoundrlst", SqlDbType.varchar, 25);
cmd.Connection = con;
Country.Value = txtCountry.text.ToString();
cmd.Parameters.Add(Country);
SqlParameter State = new SqlParameter("#DropDownListSwestate", SqlDbType.varchar, 25);
cmd.Connection = con;
State.Value = txtState.text.ToString();
cmd.Parameters.Add(State);
SqlParameter City = new SqlParameter("#citytxtbox", SqlDbType.varchar, 25);
cmd.Connection = con;
City.Value = txtCity.text.ToString();
cmd.Parameters.Add(City);
try
{
con.Open();
cmd.ExecuteNonQuery();
lblmsg.Text = "You already complete your registration process";
}
catch (SqlException ex)
{
string errorMessage = "error in registration user";
errorMessage += ex.Message;
throw new Exception(errorMessage);
}
finally
{
con.Close();
}
}

You may be way over-complicating things. Try the following code...
var connection = new SqlConnection(connectionString);
var cmd = new SqlCommand(insertSql, connection);
cmd.Parameters.AddWithValue("#UsrNme", txtUID.Text.ToString());
cmd.Parameters.AddWithValue("#fnbox", txtfn.Text.ToString());
cmd.Parameters.AddWithValue("#lnamebox", txtLN.Text.ToString());
cmd.Parameters.AddWithValue("#passtxtbx1", txtPassword.Text.ToString());
cmd.Parameters.AddWithValue("#passtxtbx1", txtPassword.Text.ToString());
cmd.Parameters.AddWithValue("#passtxtbx2", txtRePass.Text.ToString());
cmd.Parameters.AddWithValue("#emailbox", txtEmail.Text.ToString());
cmd.Parameters.AddWithValue("#DrDncoundrlst", txtCountry.Text.ToString());
cmd.Parameters.AddWithValue("#DropDownListSwestate", txtState.Text.ToString());
cmd.Parameters.AddWithValue("#citytxtbox", txtCity.Text.ToString());
try
{
cmd.Connection.Open();
cmd.ExecuteNonQuery();
cmd.Connection.Close();
lblmsg.Text = "You already completed your registration process";
}
catch (SqlException ex)
{
var errorMessage = "error in registration user";
errorMessage += ex.Message;
throw new Exception(errorMessage);
}
finally
{
con.Close();
}
You also want to make sure the you have the following using clauses declared...
using System.Data;
using System.Data.SqlClient;
... and that txtCity is what you actually called your text box and that it's not hidden from this method by a private identifier or actually appears on a different form because the error you're getting means that the variable is outside the method's scope or has its lifetime expire before you reach this method.
Here's what all that code does. Instead of setting up tons of metadata that you should not need to declare your parameters, it lets SqlCommand do all the hard work for you and figure out what type is what based on the database column, the type of the object you passed in, and the name of the parameter. If you end up allowing the passing of invalid data, none of the elaborate metadata markup is going to save you from an error.
Likewise, you really want to look into wrapping your insertSql into a stored procedure like so in Sql Server...
create procedure adduserinfo #UsrNme nvarchar (50),
#fnbox varchar (25),
#lnamebox varchar (25),
#passtxtbx1 varchar (25),
#passtxtbx2 varchar (25),
#emailbox varchar (25),
#DrDncoundrlst varchar (25),
#DropDownListSwestate varchar (25),
#citytxtbox varchar (25)
as begin
INSERT INTO UserInfo
( UID,
FN,
LN,
Password,
RePass,
Email,
Country,
State,
City )
VALUES
( #UsrNme,
#fnbox,
#lnamebox,
#passtxtbx1,
#passtxtbx2,
#emailbox,
#DrDncoundrlst,
#DropDownListSwestate,
#citytxtbox )
end
go
Then your SqlCommand declaration would look like so...
var command = new SqlCommand("adduserinfo", connection)
{
CommandType = CommandType.StoredProcedure;
}
... and for the rest you'd follow the rest of the code I provided above. This would be the more or less proper way to do it. And at the risk of sounding nitpicky, consider more informative and consistently formatted variable and parameter names. Those who might have to modify your code in the future will thank you for it.

data-type-mismatch-in-criteria-expression-error when delete from MS Access with ADO.NET C#

i write code that insert and delete some data with Microsoft Access database , i can insert the data but when i delete it i have an error "data-type-mismatch-in-criteria-expression" i don't know why !!! Any one help me ?
thanks in advance ;
private void Savebt_Click(object sender, EventArgs e)
{
//try
//{
OleDbConnection conn = new OleDbConnection(#"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:\me\Library Store\Library Store\Store.accdb");
try
{
conn.Open();
OleDbCommand cmd = new OleDbCommand();
cmd.Connection = conn;
cmd.CommandText = "INSERT INTO Libarary ( ISBN, [Name], Gategory, Author, Cost, [Date]) " +
"VALUES ( #ISBN, #Name, #Gategory, #Author, #Cost, #Date) ";
cmd.Parameters.AddWithValue("#ISBN", ISBNTB.Text);
cmd.Parameters.AddWithValue("#Name", NameTB.Text);
cmd.Parameters.AddWithValue("#Gategory", GategoryTB.Text);
cmd.Parameters.AddWithValue("#Author", AuthorTB.Text);
cmd.Parameters.AddWithValue("#Cost", int.Parse(CostTB.Text));
cmd.Parameters.AddWithValue("#Date", dateTimePicker1.Text);
cmd.ExecuteNonQuery();
MessageBox.Show("Book Added!");
conn.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
private void sellbt_Click(object sender, EventArgs e)
{
OleDbConnection conn = new OleDbConnection(#"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:\me\Library Store\Library Store\Store.accdb");
try
{
conn.Open();
OleDbCommand cmd = new OleDbCommand();
cmd.Connection = conn;
cmd.CommandText = " DELETE * FROM Libarary WHERE ISBN=#ISBN AND [Name]=#Name AND Gategory=#Gategory AND Author=#Author AND Cost=#Cost AND [Date]=#Date ";
cmd.Parameters.AddWithValue("#ISBN", ISBNTB.Text);
cmd.Parameters.AddWithValue("#Name", NameTB.Text);
cmd.Parameters.AddWithValue("#Gategory", GategoryTB.Text);
cmd.Parameters.AddWithValue("#Author", AuthorTB.Text);
cmd.Parameters.AddWithValue("#Cost", CostTB.Text);
cmd.Parameters.AddWithValue("#Date", dateTimePicker1.Text);
cmd.ExecuteNonQuery();
MessageBox.Show("Book removed to be sold!");
conn.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
Errow with the record which i try to delete
database records

You are facing this error because one/many parameters that you are passing to your query are of not the same type as it is in the database. Cross check them. and ideally should pass parameters to your query like this
cmd.Parameters.Add("#Date", OleDbType.Date); //note i have specified the db type
cmd.Parameters["#Date"].Value =dateTimePicker1.Value;
this will ensure that you have same types as defined in your database

Try:
cmd.Parameters.AddWithValue("#Date", dateTimePicker1.Value);
DateTimePicker.Text returns string representation of selected value, not the value itself.

How about?
cmd.Parameters.AddWithValue("#Date", dateTimePicker1.Value.ToString("dd-MM-yyyy"));

Develop Reference

C# (C-Sharp) is a programming language developed by Microsoft that runs on the .NET Framework.

Creating and Calling Stored Procedures using MySQL and C# ASPNET - c#

Related

Insert in c# using npgsql

"Procedure or function expects parameter which was not supplied."

Local Database Insert query does nothing

The name '"' does not exist in the current context

data-type-mismatch-in-criteria-expression-error when delete from MS Access with ADO.NET C#

Categories

Resources