Using a SqlDataAdapter (or other ASP.NET technique), is it possible to make a single SQL call to both a stored procedure and run a select statement? Both have parameters.
I know you can combine multiple select statements...
DataSet ds = new DataSet();
using (SqlConnection connection = new SqlConnection(myConnectionString))
{
connection.Open();
SqlDataAdapter cmd = new SqlDataAdapter("SELECT id FROM Table1 WHERE id=#myid; SELECT id FROM Table2", connection);
cmd.SelectCommand.Parameters.AddWithValue("#id",myid);
cmd.Fill(ds);
}
And you can call a stored procedure in a similar way...
DataSet ds = new DataSet();
using (SqlConnection connection = new SqlConnection(myConnectionString))
{
connection.Open();
SqlDataAdapter cmd = new SqlDataAdapter("myStoredProcedure", connection);
cmd.CommandType = CommandType.StoredProcedure;
cmd.SelectCommand.Parameters.AddWithValue("#id",myid);
cmd.Fill(ds);
}
But I'd like to combine the two into a single call.
I need to keep the stored procedure and select statements separate. I do not want to combine them into a single stored procedure.
Thanks for your help!
The trick is the exec function.
From the docs
It Executes a command string or character string within a Transact-SQL
batch, or one of the following modules: system stored procedure,
user-defined stored procedure, CLR stored procedure, scalar-valued
user-defined function, or extended stored procedure.
So you could do this:
DataSet ds = new DataSet();
using (SqlConnection connection = new SqlConnection(myConnectionString))
{
connection.Open();
SqlDataAdapter cmd = new SqlDataAdapter("SELECT id FROM Table1 WHERE id=#myid; Exec myStoredProcedure #myid", connection);
cmd.SelectCommand.Parameters.AddWithValue("#myid",myid);
cmd.Fill(ds);
}
Related
This is a sample query:
declare #tempTable table
(
Id bigint
)
-- populating with temp Ids
select *
from TargetTable
where Id not in
(
select Id
from #tempTable
)
And this is C# code:
public DataTable Get(string sql)
{
var dataTable = new DataTable();
using (var connection = new SqlConnection(connectionString))
using (var command = new SqlCommand())
{
connection.Open();
command.Connection = connection;
command.CommandText = sql;
var dataReader = command.ExecuteReader();
dataTable.Load(dataReader);
}
return dataTable;
}
Running this code throws exception, complaining that:
Incorrect syntax near the keyword 'declare'.
Incorrect syntax near
')'.
I know it's possible to use join instead of #tempTable, but is there a way to run this query?
A SqlDataAdapter object can be used to populate a DataTable as follows. Instead of calling SqlCommand.ExecuteReader(), the SqlDataAdapter.Fill() method is used. In this example the argument to the Fill() method is the DataTable that will be populated. While this approach will work with the query you posted with the table variable, I'd strongly recommend converting this to a stored procedure and filling the DataTable from this instead. Additionally, unless the amount of data that's being sent into the table variable is very small using a temp table will offer more functionality (more accurate statistics, better DML performance, ROLLBACK participation, etc.) than table variables and I'd suggest using a temp table instead as well.
using (SqlConnection connection = new SqlConnection(connectionString))
{
DataTable dataTable = new DataTable();
SqlDataAdapter da = new SqlDataAdapter();
SqlCommand command = new SqlCommand(cmd, connection);
da.SelectCommand = command;
connection.Open();
da.Fill(dataTable);
}
Stored Procedure Call:
using (SqlConnection connection = new SqlConnection(connectionString))
{
DataTable dataTable = new DataTable();
SqlDataAdapter da = new SqlDataAdapter();
//use SP name for command text
SqlCommand command = new SqlCommand("usp_ProcedureName", connection);
//stored procedure command type
command.CommandType = CommandType.StoredProcedure;
da.SelectCommand = command;
connection.Open();
da.Fill(dataTable);
}
You can create a Stored Procedure of your query then add this to your code:
command.CommandType = CommandType.StoredProcedure;
Then use exec command
command.CommandText = "exec procedureName"
If your query location is in database itself.
I'm trying to execute a query from OracleDataAdapter in C#, this query will go to a DBLink available in the DB, but for some reason when it needs to fill the datatable it throws me an error:
IndexOutOfRangeException - ndex was outside the bounds of the array
the code I'm trying to execute is:
OracleConnection conn = new OracleConnection(connectionString);
conn.Open();
DataSet dataSet = new DataSet();
OracleCommand cmd = new OracleCommand("select count(*) alive from dual#MYDBLINK");
cmd.CommandType = CommandType.Text;
cmd.Connection = conn;
using (OracleDataAdapter dataAdapter = new OracleDataAdapter())
{
dataAdapter.SelectCommand = cmd;
dataAdapter.Fill(dataSet); //Here is where it fails
}
The query works if I execute in sql developer, and the code works if I remove the DBLink information and let the query as select count(*) alive from dual, so I asume, that the issue here is something with the DBLink or the # character.
I am really get depressed about this error all function code is correct but still its giving me the error, I am trying to select information from SQL Server database.
Stored procedure:
create procedure sp_select_companydetails
#id varchar(5)
as
begin
select company_name, company_address
from CompanyDetails
end
C# Code:
2) On Form button click event
string id = "1";
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = "sp_select_companydetails";
cmd.Parameters.Add("#id", id);
FillDataset();
In class
public DataSet FillDataset()
{
try
{
using (cmd)
{
DataSet ds = new DataSet();
cmd.Connection = con;
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(ds);
cmd.Parameters.Clear();
return ds;
}
}
catch (Exception)
{
throw;
}
}
When I click on form button I get this error:
Procedure or function sp_select_companydetails has too many arguments specified.
Suggest me good solution
Thank you in advance
Instead of using a global SqlCommand, create it as new everytime you need it. This is a recommended approach when you deal with disposable objects
using (SqlConnection con = new SqlConnection(GetConnectionString())
using (SqlCommand myCmd = new SqlCommand("sp_select_companydetails", con))
{
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add("#id", SqlDbType.VarChar).Value = "1";
DataSet ds = new DataSet();
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(ds);
return ds;
}
By the way, we cannot see how do you create the SqlConnection, but it seems that you have another disposable object kept at the global level. This is particular nasty with an SqlConnection because this object keeps references to system wide resources both on client and on server. Do not create global connection objects, just create a global method that returns the current connectionstring to use in creation of the local SqlConnection (the GetConnectionString() in my example above). If you think that this is a performance killer I suggest you to read about the concept of connection pooling
Is it possible to call a stored procedure which will insert the details first and at the end will return a table. At present I have written two stored procedures for it: one for inserting and the other for getting the details. Now I'm trying to do both at the same time.
I'm using ExecuteScalar for inserting and ExecuteDataSet for selecting.
If your stored procedure returns data using a SELECT (of course, I suppose that you need to read that data) then you should use the SqlDataAdapter with its Fill method or an SqlDataReader using the ExecuteReader on the SqlCommand
ExecuteReader:
using(SqlConnection cn = new SqlConnection(...))
using(SqlCommand cmd = new SqlCommand(procName, cn))
{
cmd.CommandType = CommandType.StoredProcedure;
cn.Open()
using(SqlDataReader r = cmd.ExecuteReader())
{
while(r.Read())
{
// read every row and use the field values .....
}
}
}
SqlDataAdapter.Fill:
using(SqlConnection cn = new SqlConnection(...))
using(SqlCommand cmd = new SqlCommand(procName, cn))
{
cmd.CommandType = CommandType.StoredProcedure;
cn.Open()
using(SqlDataAdapter da = new SqlDataAdapter(cmd)
{
DataTable dt = new DataTable();
da.Fill(dt);
// DataTable filled with the data returned by the last SELECT in your SP
......
}
}
The SqlCommand.ExecuteReader or SqlDataAdapter.Fill will execute the stored procedure without looking at what the stored procedure does, but they expect that some kind of tabular data will be returned to loop over it
You write a procedure like this
CREATE PROCEDURE SP_Name
(
//PARAMETES
)
AS
BEGIN
//INSERT STATEMENT
//SELECT STATEMENT
END
and call ExecuteDataSet()
SqlConnection cn = new SqlConnectio(...)
SqlCommand cmd = new SqlCommand("procName", cn)
{
cmd.CommandType = CommandType.StoredProcedure;
cn.Open();
cmd.ExecuteScalar();
}
I would like to create a C# method that accepts one parameter, the name of a stored procedure. The method will then execute the following system stored procedure directly without using a user-defined sub routine to wrap this call.
sys.sp_helptext 'proc name'
I get the error:
Could not find stored procedure 'sys.sp_help_text
Is this a permissions issue (I am Admin of my test db) or qualification issue?
public static string GetStoredProcedure(string objectName, string connectionString)
{
using (SqlConnection sqlConnection = new SqlConnection())
{
sqlConnection.ConnectionString = connectionString;
sqlConnection.Open();
SqlCommand sqlCommand = new SqlCommand("sys.sp_help_text", sqlConnection);
sqlCommand.CommandType = CommandType.StoredProcedure;
sqlCommand.Parameters.AddWithValue("#objname", objectName);
DataSet ds = new DataSet();
SqlDataAdapter sqlDataAdapter = new SqlDataAdapter();
sqlDataAdapter.SelectCommand = sqlCommand;
sqlDataAdapter.Fill(ds);
return DataTableToString(ds.Tables[0]);;
}
}
no issue, just named wrong
try
SqlCommand sqlCommand = new SqlCommand("sys.sp_helptext", sqlConnection);
instead of
SqlCommand sqlCommand = new SqlCommand("sys.sp_help_text", sqlConnection);
you probably must connect to database with a login with some more privileges. try executing this sp from managment studio after you login with same account your app is using.