I have a stored procedure as
pr___GetArchiveData
Select * from TABLE1
SELECT * FROM TABLE2
SELECT * FROM TABLE 3
I want to get this result set into a dataset. Or access the values of three select queries!!
I have a DBML file in which when i drag and drop the stored procedure generates a code as follows:-
global::System.Data.Linq.Mapping.FunctionAttribute(Name="dbo.pr___GetArchiveData")]
public ISingleResult<pr___GetArchiveDataResult> pr___GetArchiveData([global::System.Data.Linq.Mapping.ParameterAttribute(DbType="UniqueIdentifier")] System.Nullable<System.Guid> projectID)
{
IExecuteResult result = this.ExecuteMethodCall(this, ((MethodInfo)(MethodInfo.GetCurrentMethod())), projectID);
return ((ISingleResult<pr__Project_pr___GetArchiveData>)(result.ReturnValue));
}
In the code MVC3 Architecture + LINQ i have written a code to get the result set as follows :-
using (HBDataContext hb = new HBDataContext())
{
System.Data.DataSet ds = new System.Data.DataSet();
String connString = connString;
var conn = new System.Data.SqlClient.SqlConnection(connString);
var cmd = conn.CreateCommand();
cmd.CommandType = System.Data.CommandType.StoredProcedure;
cmd.CommandText = "pr__GetArchiveData";
cmd.Connection.Open();
var mReader = cmd.ExecuteReader(System.Data.CommandBehavior.SequentialAccess);
//var reader = cmd.ExecuteReader();
//using (System.Data.SqlClient.SqlDataReader mReader = cmd.ExecuteReader())
//{
// while (mReader.Read())
//{
// mReader.Read();
var tbl1 = hb.Translate<tbl1 >(mReader).ToList();
// mReader = cmd.ExecuteReader();
mReader.NextResult();
var tbl2 = hb.Translate<tbl2 >(mReader).ToList();
mReader.NextResult();
var tbl3 = hb.Translate<tbl3>(mReader).ToList();
// }
// }
}
But while running it throws error as -
"Invalid attempt to call NextResult when reader is closed."
I am not sure where i am wrong!!
I have tried using it as while
(mReader.Read())
Kindly suggest!!!!
The code gen for ISingleResult won't provide multiple result sets
Try adding your own IMultipleResults wrapper - see the tutorial in http://blogs.msdn.com/b/dditweb/archive/2008/05/06/linq-to-sql-and-multiple-result-sets-in-stored-procedures.aspx
In .dbml file for the stored procedure the code will be like
[global::System.Data.Linq.Mapping.FunctionAttribute(Name="dbo.pr__Home_GetArchiveData")]
public ISingleResult<pr__Home_GetArchiveData> pr__Home_GetArchiveData([global::System.Data.Linq.Mapping.ParameterAttribute(Name="AlbumID", DbType="UniqueIdentifier")] System.Nullable<System.Guid> albumID)
{
IExecuteResult result = this.ExecuteMethodCall(this, ((MethodInfo)(MethodInfo.GetCurrentMethod())), albumID);
return ((ISingleResult<pr__Album_GetAlbumsFilesResult>)(result.ReturnValue));
}
Replace it with IMultipleResult as below `
[global::System.Data.Linq.Mapping.FunctionAttribute(Name = "dbo.pr__Home_GetArchiveData")]
[ResultType(typeof(tbl1))]
[ResultType(typeof(tbl2))]
[ResultType(typeof(tbl3))]
[ResultType(typeof(tbl4))]
public IMultipleResults pr__Home_GetArchiveData([global::System.Data.Linq.Mapping.ParameterAttribute(Name = "HOMEID", DbType = "UniqueIdentifier")] System.Nullable hOMEID)
{
IExecuteResult result = this.ExecuteMethodCall(this, ((MethodInfo)(MethodInfo.GetCurrentMethod())), hOMEID);
return ((IMultipleResults)result.ReturnValue);
}
in the code .
using (HBDataContext hb = new HBDataContext())
{
using (System.Data.Linq.IMultipleResults _results = hb.pr__Home_GetArchiveData(model.HomeID))
{
List<tbl1> _tbl1= _results.GetResult<tbl1>().ToList();
List<tbl2> _tbl2= _results.GetResult<tbl2>().ToList();
List<tbl3> _tbl3= _results.GetResult<tbl3>().ToList();
List<tbl4> _tbl4= _results.GetResult<tbl4>().ToList();}}
You will get the values of the Select queries from theStoredProcedure ...
Related
I'm trying to get the daa from windows azure storage but I'm getting table not found. I've already saw the others answers but nothing works...
I did try this:
private void popula()
{
var account = CloudStorageAccount.Parse(RoleEnvironment.GetConfigurationSettingValue("Conn"));
account.CreateCloudTableClient().CreateTableIfNotExist("fiscal");
var context = new CRUDManifestacoesEntities(account.TableEndpoint.ToString(), account.Credentials);
Hashtable ht = (Hashtable)ViewState["filtro"];
var teste = ViewState["x"].ToString();
if (ht == null)
GridView1.DataSource = context.SelectConc(teste);
else
GridView1.DataSource = context.SelectConc(ht);
}
public List<ManifestacaoGrid> SelectConc(string conc)
{
conc = Crypto.DecryptString(conc);
IQueryable<ManifestacaoEntity> results = null;
if (!conc.Equals("dfg"))
results = from c in ManifestacaoEntities where c.concessionaria == conc select c;
else
results = from c in ManifestacaoEntities select c;
var query = results.AsTableServiceQuery<ManifestacaoEntity>();
var queryResults = query.Execute();
List<ManifestacaoGrid> al = new List<ManifestacaoGrid>();
foreach (ManifestacaoEntity mf in queryResults)
{
.......
}
I'm getting this error:
TableNotFoundThe table specified does not exist.
RequestId:285f6ef7-b1ce-4c21-9406-3e9f6a58755b
Time:2014-01-15T14:30:55.7989535Z
EDIT: I did print '_account' to see if the credentials are correct:
var credencial = "Connection string with sensitive data: " + account.ToString(true);
and the AccountName and AccountKey are correct ...but how can I know if the requested table is correct?
The secundary key is needed in storage account?
I did found the problem. I write
public IQueryable<UserEntity> UserEntities
{
get
{
return this.CreateQuery<UserEntity>("tableName");
}
}
Instead of:
public IQueryable<UserEntity> UserEntities
{
get
{
return this.CreateQuery<UserEntity>("UserEntities");
}
}
I´m trying to use dapper with Oracle (ODP.NET) and I would like to use the "QueryMultiple" functionality.
Passing this string to the QueryMultiple method:
var query = "Select CUST_ID CustId from Customer_info WHERE CUST_ID=:custId;" +
"Select CUST_ID CustId from BCR WHERE CUST_ID=:custId";
I´m getting a ORA-00911: invalid character error
Is there any way to do this or it´s not possible?
Tks
The OP has probably long since solved the issue by now, but as of the time of writing, this question has only one answer and it doesn't really solve the problem of using Dapper's QueryMultiple() method with Oracle. As #Kamolas81 correctly states, by using the syntax from the official examples, one will indeed get the ORA-00933: SQL command not properly ended error message. I spent a while searching for some sort of documentation about how to do QueryMultiple() with Oracle, but I was surprised that there wasn't really one place that had an answer. I would have thought this to be a fairly common task. I thought that I'd post an answer here to save me :) someone some time in the future just in case anybody happens to have this same problem.
Dapper seems to just pass the SQL command straight along to ADO.NET and whatever db provider is executing the command. In the syntax from the examples, where each command is separated by a line break, SQL server will interpret that as multiple queries to run against the database and it will run each of the queries and return the results into separate outputs. I'm not an ADO.NET expert, so I might be messing up the terminology, but the end effect is that Dapper gets the multiple query outputs and then works its magic.
Oracle, though, doesn't recognize the multiple queries; it thinks that the SQL command is malformed and returns the ORA-00933 message. The solution is to use cursors and return the output in a DynamicParameters collection. For example, whereas the SQL Server version would look like this:
var sql =
#"
select * from Customers where CustomerId = #id
select * from Orders where CustomerId = #id
select * from Returns where CustomerId = #id";
the Oracle version of the query would need to look like this:
var sql = "BEGIN OPEN :rslt1 FOR SELECT * FROM customers WHERE customerid = :id; " +
"OPEN :rslt2 FOR SELECT * FROM orders WHERE customerid = :id; " +
"OPEN :rslt3 FOR SELECT * FROM returns Where customerid = :id; " +
"END;";
For queries run against SQL Server, Dapper can handle it from there. However, because we're returning the result sets into cursor parameters, we'll need to use an IDynamicParameters collection to specify parameters for the command. To add an extra wrinkle, the normal DynamicParameters.Add() method in Dapper uses a System.Data.DbType for the optional dbType parameter, but the cursor parameters for the query need to be of type Oracle.ManagedDataAccess.Client.OracleDbType.RefCursor. To solve this, I used the solution which #Daniel Smith proposed in this answer and created a custom implementation of the IDynamicParameters interface:
using Dapper;
using Oracle.ManagedDataAccess.Client;
using System.Data;
public class OracleDynamicParameters : SqlMapper.IDynamicParameters
{
private readonly DynamicParameters dynamicParameters = new DynamicParameters();
private readonly List<OracleParameter> oracleParameters = new List<OracleParameter>();
public void Add(string name, OracleDbType oracleDbType, ParameterDirection direction, object value = null, int? size = null)
{
OracleParameter oracleParameter;
if (size.HasValue)
{
oracleParameter = new OracleParameter(name, oracleDbType, size.Value, value, direction);
}
else
{
oracleParameter = new OracleParameter(name, oracleDbType, value, direction);
}
oracleParameters.Add(oracleParameter);
}
public void Add(string name, OracleDbType oracleDbType, ParameterDirection direction)
{
var oracleParameter = new OracleParameter(name, oracleDbType, direction);
oracleParameters.Add(oracleParameter);
}
public void AddParameters(IDbCommand command, SqlMapper.Identity identity)
{
((SqlMapper.IDynamicParameters)dynamicParameters).AddParameters(command, identity);
var oracleCommand = command as OracleCommand;
if (oracleCommand != null)
{
oracleCommand.Parameters.AddRange(oracleParameters.ToArray());
}
}
}
So all of the code together goes something like this:
using Dapper;
using Oracle.ManagedDataAccess.Client;
using System.Data;
int selectedId = 1;
var sql = "BEGIN OPEN :rslt1 FOR SELECT * FROM customers WHERE customerid = :id; " +
"OPEN :rslt2 FOR SELECT * FROM orders WHERE customerid = :id; " +
"OPEN :rslt3 FOR SELECT * FROM returns Where customerid = :id; " +
"END;";
OracleDynamicParameters dynParams = new OracleDynamicParameters();
dynParams.Add(":rslt1", OracleDbType.RefCursor, ParameterDirection.Output);
dynParams.Add(":rslt2", OracleDbType.RefCursor, ParameterDirection.Output);
dynParams.Add(":rslt3", OracleDbType.RefCursor, ParameterDirection.Output);
dynParams.Add(":id", OracleDbType.Int32, ParameterDirection.Input, selectedId);
using (IDbConnection dbConn = new OracleConnection("<conn string here>"))
{
dbConn.Open();
var multi = dbConn.QueryMultiple(sql, param: dynParams);
var customer = multi.Read<Customer>().Single();
var orders = multi.Read<Order>().ToList();
var returns = multi.Read<Return>().ToList();
...
dbConn.Close();
}
Building on greyseal96's helpful answer, I created this implementation of IDynamicParameters:
public class OracleDynamicParameters : SqlMapper.IDynamicParameters
{
private readonly DynamicParameters dynamicParameters;
private readonly List<OracleParameter> oracleParameters = new List<OracleParameter>();
public OracleDynamicParameters(params string[] refCursorNames) {
dynamicParameters = new DynamicParameters();
AddRefCursorParameters(refCursorNames);
}
public OracleDynamicParameters(object template, params string[] refCursorNames) {
dynamicParameters = new DynamicParameters(template);
AddRefCursorParameters(refCursorNames);
}
private void AddRefCursorParameters(params string[] refCursorNames)
{
foreach (string refCursorName in refCursorNames)
{
var oracleParameter = new OracleParameter(refCursorName, OracleDbType.RefCursor, ParameterDirection.Output);
oracleParameters.Add(oracleParameter);
}
}
public void AddParameters(IDbCommand command, SqlMapper.Identity identity)
{
((SqlMapper.IDynamicParameters)dynamicParameters).AddParameters(command, identity);
var oracleCommand = command as OracleCommand;
if (oracleCommand != null)
{
oracleCommand.Parameters.AddRange(oracleParameters.ToArray());
}
}
}
Assuming the same query, it can be used so:
var queryParams = new { id };
string[] refCursorNames = { "rslt1", "rslt2", "rslt3" };
var dynParams = new OracleDynamicParameters(queryParams, refCursorNames);
...
var multi = dbConn.QueryMultiple(sql, param: dynParams);
I suspect this is two or three separate things:
Your first query should not have a semi-colon
There is no new-line character between the queries
The usage notes imply that the bind character is # not : (no idea if this depends on the RDBMS being used).
If you look at the Dapper Google Code page the example given for QueryMultiple() is:
var sql =
#"
select * from Customers where CustomerId = #id
select * from Orders where CustomerId = #id
select * from Returns where CustomerId = #id";
using (var multi = connection.QueryMultiple(sql, new {id=selectedId}))
{
var customer = multi.Read<Customer>().Single();
var orders = multi.Read<Order>().ToList();
var returns = multi.Read<Return>().ToList();
...
}
Remove the semi-colon; add a new line and if you still have issues change the bind character.
I am trying to get a record from database using linq but it keep return no record
it is very basic sql statment
select * where productid ='12553'
however the following code does not return any result. Please advise. thx you
private static IEnumerable<ProductModel> GetAllProduct(string productId)
{
using (var dc = new TestEntities())
{
var result = (from a in dc.Products
where a.productid == productId
select new ProductModel
{
ProductId = a.productid,
Name = a.ProductName
});
return result.Distinct().ToList();
}
}
You don't need projection here:
using (var dc = new TestEntities())
{
var result = from a in dc.Products
where a.productid == productId
select a;
return result.Distinct().ToList();
}
Is it possible to use Dynamic Linq to run a query similar to:
Select a, b, a + b as c
from MyDataTable
I have an application where the user can enter SQL statements, the results of these statements are then assigned to a DataTable. There is also the option to derive a field based on other fields. (e.g. user can say field C = a + b, or field D = A*B+10 etc).
Ideally I would like to do something similar to:
string myCalc = "Convert.ToDouble(r.ItemArray[14])+Convert.ToDouble(r.ItemArray[45])";
var parameters = from r in dt.AsEnumerable()
select (myCalc);
What I want to do in this example is add the value of column 14 to column 45 and return it. It's up to the user to decide what expression to use so the text in the select needs to be from a string, I cannot hard code the expression. The string myCalc is purely for demonstration purposes.
You could do that using a Dictionary, and a DataReader and Dynamic Queries. Here is an example based in part in Rob Connery's Massive ORM RecordToExpando:
void Main()
{
string connString = "your connection string";
System.Data.SqlClient.SqlConnection conn = new SqlConnection(connString);
string statement = "SUM = EstimatedEffort + OriginalEstimate, Original = OriginalEstimate";
// Note: You should parse the statement so it doesn't have any updates or inserts in it.
string sql = "SELECT " + statement +" FROM Activities";
List<IDictionary<string, object>> results = new List<IDictionary<string, object>>();
conn.Open();
using(conn)
{
var cmd = new SqlCommand(sql, conn);
var reader = cmd.ExecuteReader();
while (reader.Read())
{
var dic = new Dictionary<string, object>();
for (int i = 0; i < reader.FieldCount; i++)
{
dic.Add(
reader.GetName(i),
DBNull.Value.Equals(reader[i]) ? null : reader[i]);
}
results.Add(dic);
}
}
foreach (var dicRow in results)
{
foreach (string key in dicRow.Keys)
{
Console.Write("Key: " + key + " Value: " + dicRow[key]);
}
Console.WriteLine();
}
}
Something like this:
void Main()
{
var dataTable = new DataTable();
dataTable.Columns.Add("a", typeof(double));
dataTable.Columns.Add("b", typeof(double));
dataTable.Rows.Add(new object[] { 10, 20 });
dataTable.Rows.Add(new object[] { 30, 40 });
string myCalc = "Convert.ToDouble(ItemArray[0]) + Convert.ToDouble(ItemArray[1])";
var query = dataTable.AsEnumerable().AsQueryable();
var result = query.Select(myCalc);
foreach (Double c in result)
{
System.Console.WriteLine(c);
}
}
How can I update a record against specific id in LINQ to SQL?
LINQ is a query tool (Q = Query) - so there is no magic LINQ way to update just the single row, except through the (object-oriented) data-context (in the case of LINQ-to-SQL). To update data, you need to fetch it out, update the record, and submit the changes:
using(var ctx = new FooContext()) {
var obj = ctx.Bars.Single(x=>x.Id == id);
obj.SomeProp = 123;
ctx.SubmitChanges();
}
Or write an SP that does the same in TSQL, and expose the SP through the data-context:
using(var ctx = new FooContext()) {
ctx.UpdateBar(id, 123);
}
In the absence of more detailed info:
using(var dbContext = new dbDataContext())
{
var data = dbContext.SomeTable.SingleOrDefault(row => row.id == requiredId);
if(data != null)
{
data.SomeField = newValue;
}
dbContext.SubmitChanges();
}
AdventureWorksDataContext db = new AdventureWorksDataContext();
db.Log = Console.Out;
// Get hte first customer record
Customer c = from cust in db.Customers select cust where id = 5;
Console.WriteLine(c.CustomerType);
c.CustomerType = 'I';
db.SubmitChanges(); // Save the changes away
DataClassesDataContext dc = new DataClassesDataContext();
FamilyDetail fd = dc.FamilyDetails.Single(p => p.UserId == 1);
fd.FatherName=txtFatherName.Text;
fd.FatherMobile=txtMobile.Text;
fd.FatherOccupation=txtFatherOccu.Text;
fd.MotherName=txtMotherName.Text;
fd.MotherOccupation=txtMotherOccu.Text;
fd.Phone=txtPhoneNo.Text;
fd.Address=txtAddress.Text;
fd.GuardianName=txtGardianName.Text;
dc.SubmitChanges();
I found a workaround a week ago. You can use direct commands with "ExecuteCommand":
MDataContext dc = new MDataContext();
var flag = (from f in dc.Flags
where f.Code == Code
select f).First();
_refresh = Convert.ToBoolean(flagRefresh.Value);
if (_refresh)
{
dc.ExecuteCommand("update Flags set value = 0 where code = {0}", Code);
}
In the ExecuteCommand statement, you can send the query directly, with the value for the specific record you want to update.
value = 0 --> 0 is the new value for the record;
code = {0} --> is the field where you will send the filter value;
Code --> is the new value for the field;
I hope this reference helps.