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Define() establishes specific data definitions. This involves defining columns/fields and creating the tables/files with optional indexes.
Below is the code for Define():
//
// Define()
//
// Open the table, if it exists. Otherwise create and open the table
//
static void Define()
{
Console.WriteLine("DEFINE");
Create_CustomerMaster_Table();
Create_CustomerOrders_Table();
Create_OrderItems_Table();
Create_ItemMaster_Table();
}
//
// Create_CustomerMaster_Table()
//
// Open table CustomerMaster, if it exists. Otherwise create it
// along with its indexes and open it
//
static void Create_CustomerMaster_Table()
{
bool do_create = false;
// define table CustomerMaster
Console.WriteLine("\ttable CustomerMaster");
try
{
tableCustMast.Open("custmast", OPEN_MODE.NORMAL_OPEN);
}
catch (CTException)
{
// table does not exist
do_create = true;
}
if (do_create)
{
try
{
// define table fields
CTField field1 = tableCustMast.AddField("cm_custnumb", FIELD_TYPE.FSTRING, 4);
tableCustMast.AddField("cm_custzipc", FIELD_TYPE.FSTRING, 9);
tableCustMast.AddField("cm_custstat", FIELD_TYPE.FSTRING, 2);
tableCustMast.AddField("cm_custratg", FIELD_TYPE.FSTRING, 1);
tableCustMast.AddField("cm_custname", FIELD_TYPE.VSTRING, 47);
tableCustMast.AddField("cm_custaddr", FIELD_TYPE.VSTRING, 47);
tableCustMast.AddField("cm_custcity", FIELD_TYPE.VSTRING, 47);
// define index
CTIndex index1 = tableCustMast.AddIndex("cm_custnumb_idx", KEY_TYPE.FIXED_INDEX, false, false);
index1.AddSegment(field1, SEG_MODE.SCHSEG_SEG);
// create table
Console.WriteLine("\tCreate table...");
tableCustMast.Create("custmast", CREATE_MODE.TRNLOG_CREATE);
// open table
Console.WriteLine("\tOpen table...");
tableCustMast.Open("custmast", OPEN_MODE.NORMAL_OPEN);
}
catch (CTException E)
{
Handle_Exception(E);
}
}
else
{
Check_Table_Mode(tableCustMast);
// confirm the index exists, if not then add the index
//
// this scenario arises out of the fact that this table was created in tutorial 1
// without indexes. The index is now created by the call to ctdbAlterTable
do_create = false;
try
{
tableCustMast.GetIndex("cm_custnumb_idx");
}
catch (CTException)
{
do_create = true;
}
if (do_create)
{
try
{
CTField field1 = tableCustMast.GetField("cm_custnumb");
CTIndex index1 = tableCustMast.AddIndex("cm_custnumb_idx", KEY_TYPE.FIXED_INDEX, false, false);
index1.AddSegment(field1, SEG_MODE.SCHSEG_SEG);
tableCustMast.Alter(ALTER_TABLE.NORMAL);
}
catch (CTException E)
{
Handle_Exception(E);
}
}
}
}
//
// Create_CustomerOrders_Table()
//
// Open table CustomerOrders, if it exists. Otherwise create it
// along with its indexes and open it
//
static void Create_CustomerOrders_Table()
{
bool do_create = false;
// define table CustomerOrders
Console.WriteLine("\ttable CustomerOrders");
try
{
tableCustOrdr.Open("custordr", OPEN_MODE.NORMAL_OPEN);
}
catch (CTException)
{
// table does not exist
do_create = true;
}
if (do_create)
{
try
{
// define table fields
tableCustOrdr.AddField("co_ordrdate", FIELD_TYPE.DATE, 4);
tableCustOrdr.AddField("co_promdate", FIELD_TYPE.DATE, 4);
CTField field1 = tableCustOrdr.AddField("co_ordrnumb", FIELD_TYPE.FSTRING, 6);
CTField field2 = tableCustOrdr.AddField("co_custnumb", FIELD_TYPE.FSTRING, 4);
// define indexes
CTIndex index1 = tableCustOrdr.AddIndex("co_ordrnumb_idx", KEY_TYPE.LEADING_INDEX, false, false);
index1.AddSegment(field1, SEG_MODE.SCHSEG_SEG);
CTIndex index2 = tableCustOrdr.AddIndex("co_custnumb_idx", KEY_TYPE.LEADING_INDEX, true, false);
index2.AddSegment(field2, SEG_MODE.SCHSEG_SEG);
// create table
Console.WriteLine("\tCreate table...");
tableCustOrdr.Create("custordr", CREATE_MODE.TRNLOG_CREATE);
// open table
Console.WriteLine("\tOpen table...");
tableCustOrdr.Open("custordr", OPEN_MODE.NORMAL_OPEN);
}
catch (CTException E)
{
Handle_Exception(E);
}
}
else
Check_Table_Mode(tableCustOrdr);
}
//
// Create_OrderItems_Table()
//
// Open table OrderItems, if it exists. Otherwise create it
// along with its indexes and open it
//
static void Create_OrderItems_Table()
{
bool do_create = false;
// define table OrderItems
Console.WriteLine("\ttable OrderItems");
try
{
tableOrdrItem.Open("ordritem", OPEN_MODE.NORMAL_OPEN);
}
catch (CTException)
{
// table does not exist
do_create = true;
}
if (do_create)
{
try
{
// define table fields
CTField field1 = tableOrdrItem.AddField("oi_sequnumb", FIELD_TYPE.INT2, 2);
tableOrdrItem.AddField("oi_quantity", FIELD_TYPE.INT2, 2);
CTField field2 = tableOrdrItem.AddField("oi_ordrnumb", FIELD_TYPE.FSTRING, 6);
CTField field3 = tableOrdrItem.AddField("oi_itemnumb", FIELD_TYPE.FSTRING, 5);
// define indexes
CTIndex index1 = tableOrdrItem.AddIndex("oi_ordrnumb_idx", KEY_TYPE.LEADING_INDEX, false, false);
index1.AddSegment(field2, SEG_MODE.SCHSEG_SEG);
index1.AddSegment(field1, SEG_MODE.SCHSEG_SEG);
CTIndex index2 = tableOrdrItem.AddIndex("oi_itemnumb_idx", KEY_TYPE.LEADING_INDEX, true, false);
index2.AddSegment(field3, SEG_MODE.SCHSEG_SEG);
// create table
Console.WriteLine("\tCreate table...");
tableOrdrItem.Create("ordritem", CREATE_MODE.TRNLOG_CREATE);
// open table
Console.WriteLine("\tOpen table...");
tableOrdrItem.Open("ordritem", OPEN_MODE.NORMAL_OPEN);
}
catch (CTException E)
{
Handle_Exception(E);
}
}
else
Check_Table_Mode(tableOrdrItem);
}
//
// Create_ItemMaster_Table()
//
// Open table ItemMaster, if it exists. Otherwise create it
// along with its indexes and open it
//
static void Create_ItemMaster_Table()
{
bool do_create = false;
// define table ItemMaster
Console.WriteLine("\ttable ItemMaster");
try
{
tableItemMast.Open("itemmast", OPEN_MODE.NORMAL_OPEN);
}
catch (CTException)
{
// table does not exist
do_create = true;
}
if (do_create)
{
try
{
// define table fields
tableItemMast.AddField("im_itemwght", FIELD_TYPE.INT4, 4);
tableItemMast.AddField("im_itempric", FIELD_TYPE.MONEY, 4);
CTField field1 = tableItemMast.AddField("im_itemnumb", FIELD_TYPE.FSTRING, 5);
tableItemMast.AddField("im_itemdesc", FIELD_TYPE.VSTRING, 47);
// define indexes
CTIndex index1 = tableItemMast.AddIndex("im_itemnumb_idx", KEY_TYPE.LEADING_INDEX, false, false);
index1.AddSegment(field1, SEG_MODE.SCHSEG_SEG);
// create table
Console.WriteLine("\tCreate table...");
tableItemMast.Create("itemmast", CREATE_MODE.TRNLOG_CREATE);
// open table
Console.WriteLine("\tOpen table...");
tableItemMast.Open("itemmast", OPEN_MODE.NORMAL_OPEN);
}
catch (CTException E)
{
Handle_Exception(E);
}
}
else
Check_Table_Mode(tableItemMast);
}
//
// Check_Table_Mode()
//
// Check if existing table has transaction processing flag enabled.
// If a table is under transaction processing control, modify the
// table mode to disable transaction processing
//
static void Check_Table_Mode(CTTable table)
{
try
{
// get table create mode
CREATE_MODE mode = table.GetCreateMode();
// check if table is not under transaction processing control
if ((mode & CREATE_MODE.TRNLOG_CREATE) == 0)
{
// change file mode to enable transaction processing
mode |= CREATE_MODE.TRNLOG_CREATE;
table.UpdateCreateMode(mode);
}
}
catch (CTException E)
{
Handle_Exception(E);
}
}
