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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 they exist. Otherwise create and open the table
*/
#ifdef PROTOTYPE
VOID Define(VOID)
#else
VOID Define()
#endif
{
printf("DEFINE\n");
Create_CustomerMaster_Table();
}
/*
* Create_CustomerMaster_Table()
*
* Open table CustomerMaster, if it exists. Otherwise create it
* along with its indexes and open it
*/
#ifdef PROTOTYPE
VOID Create_CustomerMaster_Table(VOID)
#else
VOID Create_CustomerMaster_Table()
#endif
{
CTHANDLE pField1, pField2, pField3, pField4;
CTHANDLE pField5, pField6, pField7;
CTHANDLE pIndex;
CTHANDLE pIseg;
/* define table CustomerMaster */
printf("\ttable CustomerMaster\n");
/* allocate a table handle */
if ((hTable = ctdbAllocTable(hDatabase)) == NULL)
Handle_Error("Create_CustomerMaster_Table(): ctdbAllocTable()");
/* open table */
if (ctdbOpenTable(hTable, "custmast", CTOPEN_NORMAL))
{
/* define table fields */
pField1 = ctdbAddField(hTable, "cm_custnumb", CT_FSTRING, 4);
pField2 = ctdbAddField(hTable, "cm_custzipc", CT_FSTRING, 9);
pField3 = ctdbAddField(hTable, "cm_custstat", CT_FSTRING, 2);
pField4 = ctdbAddField(hTable, "cm_custratg", CT_FSTRING, 1);
pField5 = ctdbAddField(hTable, "cm_custname", CT_STRING, 47);
pField6 = ctdbAddField(hTable, "cm_custaddr", CT_STRING, 47);
pField7 = ctdbAddField(hTable, "cm_custcity", CT_STRING, 47);
if (!pField1 || !pField2 || !pField3 || !pField4 ||
!pField5 || !pField6|| !pField7)
Handle_Error("Create_CustomerMaster_Table(): ctdbAddField()");
/* define index */
pIndex = ctdbAddIndex(hTable, "cm_custnumb_idx", CTINDEX_FIXED, NO, NO);
pIseg = ctdbAddSegment(pIndex, pField1, CTSEG_SCHSEG);
if (!pIndex || !pIseg)
Handle_Error("Create_CustomerMaster_Table(): ctdbAddIndex()|ctdbAddSegment()");
/* create table */
if (ctdbCreateTable(hTable, "custmast", CTCREATE_NORMAL))
Handle_Error("Create_CustomerMaster_Table(): ctdbCreateTable()");
/* open table */
if (ctdbOpenTable(hTable, "custmast", CTOPEN_NORMAL))
Handle_Error("Create_CustomerMaster_Table(): ctdbOpenTable()");
}
else
{
Check_Table_Mode(hTable);
/* 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
*/
if (ctdbGetIndexByName(hTable, "cm_custnumb_idx") == NULL)
{
pField1 = ctdbGetFieldByName(hTable, "cm_custnumb");
pIndex = ctdbAddIndex(hTable, "cm_custnumb_idx", CTINDEX_FIXED, NO, NO);
pIseg = ctdbAddSegment(pIndex, pField1, CTSEG_SCHSEG);
if (!pIndex || !pIseg)
Handle_Error("Create_CustomerMaster_Table(): ctdbAddIndex()|ctdbAddSegment()");
if (ctdbAlterTable(hTable, CTDB_ALTER_NORMAL) != CTDBRET_OK)
Handle_Error("Create_CustomerMaster_Table(): ctdbAlterTable()");
}
}
}
/*
* 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
*/
#ifdef PROTOTYPE
VOID Check_Table_Mode(CTHANDLE hTable)
#else
VOID Check_Table_Mode(hTable)
CTHANDLE hTable;
#endif
{
CTCREATE_MODE mode;
/* get table create mode */
mode = ctdbGetTableCreateMode(hTable);
/* check if table is under transaction processing control */
if ((mode & CTCREATE_TRNLOG))
{
/* change file mode to disable transaction processing */
mode ^= CTCREATE_TRNLOG;
if (ctdbUpdateCreateMode(hTable, mode) != CTDBRET_OK)
Handle_Error("Check_Table_Mode(); ctdbUpdateCreateMode");
}
}
