} //ReadItemListFromDatabase
//---------------------------------------------------------------------------------------------------------------
///<summary>
/// ReadItemListFromDatabase_ByProjectID - read all records from "theTable" insert them into this.itemList, filter by projectID
/// 1) Erase the current itemList in memory first
/// 2) Read records from SQLServer, filling the itemList
///</summary>
///<input>List<mapping_note> itemList - an ordinary List<> of type mapping_note, will be cleared if not already empty </input>
///<output>List<mapping_note> itemList- an ordinary List<> of type mapping_note, extracted from the database </output>
///<param name="projectId"></param>
public void ReadItemListFromDatabase_ByProjectID(int projectId)
{
itemList.Clear(); //First, empty the existing list contents
string sQuery = "SELECT * FROM " + theTable +
" WHERE projectId=" + "'" + projectId.ToString() + "'";
DataSet dsObj = DBUtils.ExecuteSqlQuery(sQuery);
if (dsObj != null && dsObj.Tables[0].Rows.Count > 0)
{
DataTable dtObj = dsObj.Tables[0]; //get the DataTable reference once
foreach (DataRow dr in dtObj.Rows)
{
//extract data
int intID = Convert.ToInt32(dr["ID"]);
int intmappingId = Convert.ToInt32(dr["mappingId"]);
String strnotes = dr["notes"].ToString();
//fill the itemList
mapping_note newRec = new mapping_note();
newRec.ID = intID;
newRec.mappingId = intmappingId;
newRec.notes = strnotes;
itemList.Add(newRec);
} //for
}
} //ReadItemListFromDatabase_ByProjectID
}//UpdateItemListToDatabase
//---------------------------------------------------------------------------------------------------------------
///<summary>
/// UpdateItemToDatabas - update one record within "theTable" in the database
///</summary>
///<input>mapping_note r - one item to be updated within the "theTable" in the database </input>
///<input> r.currentProject - the projectId to match with one database record</input>
public void UpdateItemToDatabase(mapping_note r)
{
SqlConnection myConnection = DBUtils.GetNewSqlConnection();
if (myConnection == null)
{
LogManager.writeToLog("New connection failed to open; in mapping_note_Table.cs:UpdateItemToDatabas.GetNewSqlConnection()");
return;
}
//WARNING: A field, like "ID", defined with "IDENTITY" semantics, cannot be assigned a value since it Auto-Increments
string strQuery = "UPDATE " + theTable +
" SET " +
" notes=@notes" +
" WHERE " +
" mappingId=@mappingId"; // <<<---- match on the Primary Key
SqlCommand myCommand = new SqlCommand(strQuery, myConnection);
//WARNING: myCommand.Parameters.AddWithValue("@ID", r.ID); //cannot assign/modify a field having IDENTITY semantics
myCommand.Parameters.AddWithValue("@notes", r.notes);
myCommand.Parameters.AddWithValue("@mappingId", r.mappingId);
myCommand.ExecuteNonQuery();
myConnection.Close();
}//UpdateItemToDatabas
}//WriteItemListToDatabase
//---------------------------------------------------------------------------------------------------------------
///<summary>
/// WriteItemToDatabase - read all records from this.itemList and write to "theTable"
///</summary>
///<output>mapping_note r - output one mapping_note object to the "theTable" in the database </output>
public void WriteItemToDatabase(mapping_note r)
{
SqlConnection myConnection = DBUtils.GetNewSqlConnection();
if (myConnection == null)
{
LogManager.writeToLog("New connection failed to open; mapping_note_Table.cs:WriteItemToDatabase.GetNewSqlConnection()");
return;
}
//WARNING: A field, like "ID", defined with "IDENTITY" semantics, cannot be assigned a value since it Auto-Increments
string strQuery = "INSERT INTO " + theTable +
" (mappingId, notes) " +
"VALUES ( @mappingId, @notes);";
SqlCommand myCommand = new SqlCommand(strQuery, myConnection);
//DEPRECATED: myCommand.Parameters.Add(...), INSTEAD USE myCommand.Parameters.AddWithValue(...)
// myCommand.Parameters.AddWithValue("@ID", r.ID); //cannot asign to a field having IDENTITY semantics
myCommand.Parameters.AddWithValue("@mappingId", r.mappingId);
myCommand.Parameters.AddWithValue("@notes", r.notes);
myCommand.ExecuteNonQuery();
myConnection.Close();
}//WriteItemToDatabaes
// <summary>
/// Equals - compare for equivalence of two objects, comparing each field individually, except for the autonumbered ID field
/// true = identical content
/// false = NOT identical content
/// </summary>
/// <param name="other"></param>
/// <returns>bool</returns>
public bool Equals(mapping_note other)
{
return(
(this.mappingId == other.mappingId) &&
(this.notes == other.notes)
);
}//Equals
}//TestDBI_T_mapping_note_Read_from_DB
/// <summary>
/// TestDBI_T_mapping_note_T3 - clear the SQLServer mapping_note table, write some demo data to SQLServer DB,
/// query the affirmatin table by Project ID,
/// </summary>
static void TestDBI_T_mapping_note_T3()
{
Console.WriteLine(" --START: TestDBI_T_mapping_note_T3");
//Construct myTable in RAM
SQLServerDB.mapping_note_Table myTable = new SQLServerDB.mapping_note_Table();
myTable.itemList = make_mapping_note_list_3();
//Count SQLServerDB mapping_note table rows before clearing
int iRows = myTable.CountRows();
Console.WriteLine("myTable.CountRows = " + iRows.ToString());
Console.WriteLine(" --before clear SQLServer database table");
Util.pause();
myTable.Clear_Database_Table();
int iRows2 = myTable.CountRows();
Console.WriteLine("myTable.CountRows = " + iRows2.ToString());
Util.pause();
myTable.WriteItemListToDatabase();
Console.WriteLine("after writing to SQLServerDB");
Util.pause();
int iRows3 = myTable.CountRows();
Console.WriteLine("myTable.CountRows = " + iRows3.ToString());
Util.pause();
int iSeek_ProjectID = 3;
Console.WriteLine("seek item: iSeek_ProjectID= " + iSeek_ProjectID);
myTable.ReadItemListFromDatabase_ByProjectID(iSeek_ProjectID);
Console.WriteLine("SEEK items found: myTable.itemList.Count =" + myTable.itemList.Count.ToString());
SQLServerDB.mapping_note itemSeek = myTable.itemList[0];
itemSeek.Show();
Util.pause("visual inspection via SSMS?");
Console.WriteLine(" --DONE: TestDBI_T_mapping_note_T3");
}
