dynasql Discussions Rss Feed

New Post: Paging implementation using some common query and different select clause

gandhiashishp — Fri, 10 May 2013 04:56:45 GMT

Hi,
Please see below function in which i have been making a use of DynaSQL framework.

*******************Function (VB.Net) *****************************************************************
Public Overloads Function GetConfiscatedMembersList() As List(Of bMemberMst)

     Try
         m_dbQuery = DBQuery.SelectAll() _
         .TopRange(MyBase.PagingInfo.PageSize *(MyBase.PagingInfo.CurrentPage - 1), MyBase.PagingInfo.PageSize) _
         .From(Database.Tables.EMEMBER_MST.ToString()) _
         .Where(Database.Tables.EMEMBER_MST.Columns.C_IS_CONFISCATED.ToString, Data.Compare.Equals, DBConst.String("1")) _
         .AndWhere(Database.Tables.EMEMBER_MST.Columns.C_STATUS.ToString, Data.Compare.Equals, DBConst.String(CByte(Gspl.Enumerations.Definations.DB_Status.Active).ToString()))

         m_ListOfT = Database.Tables.EMEMBER_MST.Rows.ToCollection(Of bMemberMst)(m_dbQuery)


         '--Set Paging Details.-------------------------------------------------------------------------------------------------------------------------------------------------------------
         If MyBase.PagingInfo.PageSize > 0 Then
             m_dbQuery = DBQuery.SelectCount() _
             .From(Database.Tables.EMEMBER_MST.ToString()) _
             .Where(Database.Tables.EMEMBER_MST.Columns.C_IS_CONFISCATED.ToString,Data.Compare.Equals, DBConst.String("1")) _
            .AndWhere(Database.Tables.EMEMBER_MST.Columns.C_STATUS.ToString,Data.Compare.Equals,DBConst.String(CByte(Gspl.Enumerations.Definations.DB_Status.Active).ToString()))
              CountTotalPages(m_dbQuery)
         End If
        '------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

         Return m_ListOfT
     Catch ex As Exception
         Throw ex
     End Try

End Function

I need to use paging based on some user preferences. Here you can see that only different ce between the two queries is,

DBQuery.SelectAll() _
.TopRange(MyBase.PagingInfo.PageSize *(MyBase.PagingInfo.CurrentPage - 1), MyBase.PagingInfo.PageSize)

And

DBQuery.SelectCount()

So, as of now you can see the query is same starting from "From" clause. Only the above part differs. So, is there any way to achieve the thing in some graceful way, instead of duplicating the query 2 times?

Thanks in advance..!!

New Post: Is this project is yet alive?

perceiveit — Fri, 19 Apr 2013 10:42:59 GMT

I see where you are going with this

DBQuery.Select(Northwind.Orders.OrderID, Northwind.Orders.OrderDate)
                 .From(Northwind.Orders)
                 .Where(Northwind.Orders.OrderStatus, Compare.Equals, OrderStatus.Complete)

And you do not have to manually crank the Northwind database schema references.

If you were to create a dependancy to this library and your tables and columns (etc) inherited from DBClause then this would work nicely.
Or would happily start including the code base in the library itself.

Thank you

New Post: Is this project is yet alive?

gandhiashishp — Mon, 08 Apr 2013 05:09:08 GMT

Hey thanks for your reply. Actually, i have created the same tool. Though using my tool, i allow to create a Stub (classes for any given databases), which allows user to refer any table or columns just using an OOPS approach.

e.g.

Database.Tables.Table_NAme.Columns.Column_Name

This allows user an ease to deal with database. Additionally, if i incorporate that feature with yours then it would be an awesome gift to the tech guys. So, i am planning to move for it.

Though, thanks for your reply. If you are happy to get my changes, then i would send you it once i am done with that.

Thank you very much.

New Post: "Duplicate Table"

perceiveit — Thu, 04 Apr 2013 11:58:47 GMT

Sounds like there are 2 things here - the dynamic analysis of the table schema, and then the select into.
I did a quick test method

using the SchemaProvider to get a table based on the name
Build a DROP clone table if exists statement
Build a CREATE clone table statement using the schema information
Build an INSERT INTO and a SELECT FROM using the schema information
Execute the DROP then CREATE
Execute the INSERT

Work surprisingly well. Code is below.

            string tbl2Clone = "DQSL_COURSES";
            string cloneTbl = tbl2Clone + "_Clone";

            //your database instance
            DBDatabase db = this.Database;

            //use the schema provider to extract the name and column info
            Schema.DBSchemaProvider schema = db.GetSchemaProvider();
            Schema.DBSchemaTable tbl = schema.GetTable(tbl2Clone);
            

            DBCreateTableQuery createClone = DBCreateTableQuery.Create.Table(tbl.Schema, cloneTbl);
            DBDropTableQuery dropClone = DBDropTableQuery.Drop.Table(tbl.Schema, cloneTbl).IfExists();

            DBInsertQuery ins = DBQuery.InsertInto(cloneTbl);
            DBSelectQuery sel = DBSelectQuery.Select();

            foreach (Schema.DBSchemaTableColumn col in tbl.Columns)
            {
                //append the columns to the create statement
                if(col.Size > 0)
                    createClone.Add(col.Name, col.DbType, col.Size, col.ColumnFlags);
                else
                    createClone.Add(col.Name, col.DbType, col.ColumnFlags);

                //if we are not an auto assign then add the column to the select and the insert
                if (col.AutoAssign == false)
                {
                    sel.Field(col.Name);
                    ins.Field(col.Name);
                }
            }
            sel = sel.From(tbl.Schema, tbl.Name);
            //add any filtering to the select statement to limit the inserted rows

            //Append the select as part of the insert
            ins.Select(sel);

            //statement construction complete

            //drop any existing cloned table
            db.ExecuteNonQuery(DBQuery.Drop.Table(cloneTbl).IfExists());
                 // IF EXISTS (SELECT *
                //          FROM [INFORMATION_SCHEMA].[TABLES]
                //          WHERE  ([TABLE_NAME] = 'DQSL_COURSES_Clone') ) 
            //              DROP TABLE [DQSL_COURSES_Clone]

            db.ExecuteNonQuery(createClone);
                    //  CREATE TABLE [dbo].[DQSL_COURSES_Clone] (
            //              [CourseID] CHAR(4) PRIMARY KEY NOT NULL, 
            //              [Title] NVARCHAR(100) NOT NULL, 
            //              [Credits] FLOAT(4) NOT NULL, 
            //              [DepartmentID] INT NOT NULL, 
            //              [Description] NVARCHAR(1000) NULL)

            //execute the insert into select from
            db.ExecuteNonQuery(ins);
                 //  INSERT INTO [DQSL_COURSES_Clone]
            //          ([CourseID], [Title], [Credits], [DepartmentID], [Description])
            //              (SELECT [CourseID], [Title], [Credits], [DepartmentID], [Description]
        //               FROM [dbo].[DQSL_COURSES])

New Post: "Duplicate Table"

glaidler — Wed, 03 Apr 2013 09:42:40 GMT

This is similar to another post, but not identical.

I have a view, which I want to 'clone' into a Staging table (drop and recreate is fine). What is the most efficient way of doing this with this library.

I can do the following:
Retrieve the data from the view into a DataTable.
create a DBCreateTableQuery
loop through the columns calling the DBCreateTableQuery.Add method.
execute the DBCreateTableQuery.

Is this the best approach - was wondering whether there was a way without the data ending up within .net (i.e. all work is done on the SQL Server)?

G

New Post: Is this project is yet alive?

perceiveit — Tue, 02 Apr 2013 08:00:59 GMT

Still alive, but help yourself to what you need.
That is what open source is about.

New Post: Is this project is yet alive?

gandhiashishp — Mon, 01 Apr 2013 09:30:41 GMT

Hey guys..!!

Actually i had been thinking to implement such concept since a long time. I also have implemented the same thing, for MySQL and MsSQL support.

Though, in order to support all the databases, i have been thinking to borrow code from here, as it will save my time. So, may i know, is this project is yet alive? Because i have seen that there is not any updates to this project since Dec 2012.

Thanks in advance

New Post: Retrieving Inserted ID

rlebi — Sun, 10 Mar 2013 22:17:17 GMT

How do I accomplish this when dynamically generating the insert query? Here's my code:

 public int CreateRecord(string tableName, Dictionary<string, string> values)
    {
        int result = 0;

        try
        {
            DBDatabase db = OpenDynamicDB();
            DBInsertQuery qry = DBQuery.InsertInto(tableName);

            foreach (KeyValuePair<string, string> kvp in values)
            {
                DBParam paramV = DBParam.ParamWithValue(kvp.Key, kvp.Value);
                qry.Field(kvp.Key);
                qry.Value(paramV);
            }

            result = db.ExecuteNonQuery(qry);
        }
        catch (Exception ex)
        {
            ExceptionManager.Publish(ex);
        }

        return result;
    }

Thanks,
Ronnie

New Post: Retrieving Inserted ID

rlebi — Sun, 10 Mar 2013 22:17:04 GMT

How do I accomplish this when dynamically generating the insert query? Here's my code:

 _public int CreateRecord(string tableName, Dictionary<string, string> values)
    {
        int result = 0;

        try
        {
            DBDatabase db = OpenDynamicDB();
            DBInsertQuery qry = DBQuery.InsertInto(tableName);

            foreach (KeyValuePair<string, string> kvp in values)
            {
                DBParam paramV = DBParam.ParamWithValue(kvp.Key, kvp.Value);
                qry.Field(kvp.Key);
                qry.Value(paramV);
            }

            result = db.ExecuteNonQuery(qry);
        }
        catch (Exception ex)
        {
            ExceptionManager.Publish(ex);
        }

        return result;
    }_

Thanks,
Ronnie

New Post: Encounter a problem of subquery alias in Oracle

perceiveit — Fri, 22 Feb 2013 10:48:05 GMT

This discussion has been copied to a work item. Click here to go to the work item and continue the discussion.

New Post: Encounter a problem of subquery alias in Oracle

mawkish — Thu, 21 Feb 2013 09:05:06 GMT

When I construct a query which involves subquery alias, I find that an AS keyword is appended between the subquery and the alias name.
However it is correct when the AS function is used on normal table join
For instance, I draft a sample query to illustrate the problem I found.
Do I use the API correctly? Or is there any workaround for this problem?
Thank you for your advice.

DBSelectQuery subQuery = DBQuery
.Select(DBField.Field("OBJECTID"))
.Max("SDE_STATE_ID").As("SDE_STATE_ID")
.From(FeatureTableSchemaName, "A" + regId)
.GroupBy("OBJECTID");

DBSelectQuery query = DBQuery
.Select(DBField.Field("atable", "OBJECTID"))
.Select(DBField.Field("atable", "LST_UPD_USR_NAME"))
.From("SDE", LineageTableName).As("sls")
.InnerJoin(FeatureTableSchemaName, "A" + regId).As("atable").On("LINEAGE_ID", Compare.Equals, "SDE_STATE_ID")
.InnerJoin(subQuery).As("filterTable").On(DBField.Field("atable", "OBJECTID"), Compare.Equals, DBField.Field("filterTable", "OBJECTID"))
.Where(DBComparison.Between(DBField.Field("sls", "LINEAGE_ID"), DBParam.ParamWithValue(startState + 1), DBParam.ParamWithValue(endState)))
.AndWhere(DBField.Field("sls", "LINEAGE_NAME"), Compare.Equals, DBParam.ParamWithValue(lineageName))
.AndWhere(DBField.Field("atable", "SDE_STATE_ID"), Compare.Equals, DBField.Field("filterTable", "SDE_STATE_ID"))
.AndWhere(DBField.Field("atable", "OBJECTID"), Compare.Equals, DBField.Field("filterTable", "OBJECTID"))
.OrderBy("OBJECTID");

which turns out to be :

SELECT "atable"."OBJECTID", "atable"."LST_UPD_USR_NAME"
    FROM "SDE"."STATE_LINEAGES" "sls" INNER JOIN "RDMSADMIN"."A109" "atable"
             ON  ("LINEAGE_ID" = "SDE_STATE_ID")  INNER JOIN 
             (SELECT "OBJECTID", MAX("SDE_STATE_ID")  AS "SDE_STATE_ID"
                FROM "RDMSADMIN"."A109"
                GROUP BY "OBJECTID") 
                 AS "filterTable"
             ON  ("atable"."OBJECTID" = "filterTable"."OBJECTID") 
    WHERE  ( ( ( ("sls"."LINEAGE_ID" BETWEEN :orc_param1 AND :orc_param2)  AND  ("sls"."LINEAGE_NAME" = :orc_param3) )  AND  ("atable"."SDE_STATE_ID" = "filterTable"."SDE_STATE_ID") )  AND  ("atable"."OBJECTID" = "filterTable"."OBJECTID") ) 
    ORDER BY "OBJECTID"

New Post: Default values in select query

mayurdongre — Mon, 07 Jan 2013 11:59:47 GMT

Hi,

I have following table

TABLE1

COL1 COL2 COL3

11 12 13

21 22 23

I want to execute query like this "SELECT getdate(),0,COL1,COL2,COL3 from TABLE1" and get date like this

07-01-2012 0 11 12 13

07-01-2012 0 21 22 23

thanks in advance.

New Post: SQL CE Support?

akilhoffer — Sat, 29 Dec 2012 15:59:29 GMT

I don't see SQL CE mentioned anywhere. Does this generator support SQL CE 4? If not, are there extensibility points I can utilize to add that support?

Thanks!

New Post: How to add new column on already exist table in database

mayurdongre — Thu, 27 Dec 2012 15:16:02 GMT

means I have already table tab1 with column col1,col2,col3 like this

tab1:

col1

col2

col3

I cann't add one more column col4 in table tab1

New Post: How to get DataTable

mayurdongre — Tue, 25 Dec 2012 08:03:48 GMT

Thanks it's usefull for me and also work if there is no data present in table

New Post: Import excel data into database

perceiveit — Thu, 20 Dec 2012 06:10:57 GMT

That's really a different capability to what we are trying to do here.

You can connect to excel files with ACE.OLEDB connection string

http://www.connectionstrings.com/excel-2007

If you are using SQL Server do it from the Management Studio import export wizard...

http://msdn.microsoft.com/en-us/library/ms140052.aspx

New Post: How to get DataTable

perceiveit — Thu, 20 Dec 2012 06:01:25 GMT

Have you tried the methods on the data table itself.

DBQuery sel = DBQuery.SelectAll().From("Table");

db.ExecuteRead(sql, reader =>
{
     DataTable dt = new DataTable();
     dt.Load(reader);
});

//do something with your table

New Post: Import excel data into database

mayurdongre — Wed, 19 Dec 2012 07:05:09 GMT

Hello Perceiveit,

is there any function to import excel file into database

I have excel file with 50000-100000 rows and 50-100 columns

is there any fasted way to insert excel record into database.

thanks in advance.

New Post: How to get DataTable

mayurdongre — Tue, 18 Dec 2012 05:15:03 GMT

I tried using this code

DataSet dsTable = new DataSet();

dsTable.Tables.Add(new DataTable("Table"));

DBQuery query = DBQuery.SelectAll().From(tableName);

Constants.DATABASE.PopulateDataSet(dsTable, query);

it works fine but give error when there is no data present in database table - "tableName"

New Post: How to get DataTable

perceiveit — Mon, 17 Dec 2012 20:40:50 GMT

Try the DBDatabase.PopulateDataSet(...) method.

Pass in the DataSet, the DBQuery and the name(s) of the table(s) you want to fill.

There are 16 overloads so should be something for you.