c-treeDB API API for C

ctdbAddCriteria

Adds a new criteria to the given CTResultSet handle

Declaration

CTHANDLE ctdbAddCriteria(CTHANDLE Handle, CTHANDLE FieldHandle,
pTEXT LowValue, pTEXT HighValue, NINT CriteriaOp)

Parameters:

Handle [IN] - Result Set handle.
FieldHandle [IN] - Field handle.
LowValue [IN] - Low Criteria Value.
HighValue [IN] - High Criteria Value. If operator requires only one criteria value, only the LowValue will be used (this one will be ignored).
CriteriaOp [IN] - Criteria Operator. Can be CTIX_EQ, CTIX_NE, CTIX_GT, CTIX_GE, CTIX_LE, CTIX_LT, CTIX_BET, CTIX_BET_IE, CTIX_BET_EI, CTIX_BET_EE, or CTIX_NOTBET.

Description

The result set handle is allocated with ctdbAllocateResultSet() for a specific table handle, and then it is possible to add one or more criteria with ctdbAddCriteria(). The criteria have a field to be checked against the table handle that owns the result set, one or two values (depending on the comparison operator) and the operator to be used. The operator can be on of: CTIX_EQ, CTIX_NE, CTIX_GT, CTIX_GE, CTIX_LE, CTIX_LT, CTIX_BET, CTIX_BET_IE, CTIX_BET_EI, CTIX_BET_EE or CTIX_NOTBET. When the result set has all the criteria added, it can be turned on or off (ctdbResultSetOnOff()) for any record handle that is allocated for the same table handle that owns the result set.

Limitations

A result set can't be turned on for a record that is already filtered. And when a record has a result set turned on, it is not possible to add any other filter. This limitation may be relaxed in the future.
When a result set is changed (ctdbAddCriteria(), ctdbRemoveCriteria() and ctdbUpdateCriteria()), it must be re-applied to the record handle (ctdbResultSetOnOff()) to have these changed take effect..

Returns

A CTResultSetCri handle. NULL otherwise.

Example

CTHANDLE hResSet;

CTHANDLE hResSetCri;

/* Allocate a Result Set for Table */

if (!(hResSet = ctdbAllocateResultSet( hTable, "resSet1" )))

Handle_Error("Test_ResultSet1(); ctdbAllocateResultSet()");

/* Add a new criteria for the Result Set just allocated */

if (!(hResSetCri = ctdbAddCriteria( hResSet, hField0, "1002", NULL, CTIX_EQ )))

Handle_Error("Test_ResultSet1(); ctdbAddCriteria()");

/* Turn on the Result Set for the current record handle */

if (ctdbResultSetOnOff( hResSet, hRecord, YES, YES, CTLOC_NONE ) != CTDBRET_OK)

Handle_Error("Test_ResultSet1(); ctdbResultSetOnOff()");

/* Display records on the Result Set */

Display_Records(hRecord);

/* Release Result Set handle */

ctdbFreeResultSet( hResSet );