c-treeDB API API for C

ctdbInsSegment

Insert a segment before the segment indicated by SegNumber

Declaration

CTHANDLE ctdbInsSegment(CTHANDLE Handle, NINT SegNumber,

CTHANDLE FieldHandle, CTSEG_MODE SegMode)

Description

ctdbInsSegment() inserts a segment before the segment indicated by SegNumber segment, given the index handle. The operation of inserting a segment links the index with the field in the table. In order to insert a segment with this function, the segment must be defined based on individual full fields, using what is known as record schema. See the c-tree Plus documentation for further information on record schemas. This function handles the segment handle allocation. Segment handle deallocation is automatically handled by ctdbCloseTable() and ctdbCloseAll().

Use ctdbInsSegmentByName() or ctdbInsSegmentByNbr() to insert a segment given the index number.Use ctdbAddSegment() to add a segment to an index. Use ctdbDelSegment() to delete a segment from an index.

After the segments, indexes, and fields have been defined, the table can be created or altered with ctdbCreateTable() or ctdbAlterTable().

Handle [in] the index handle.
SegNumber [in] the position to insert the new segment - insert the new segment before this segment number.
FieldHandle [in] the Field Handle.
SegMode [in] the Index segment mode. The valid values for the segment modes are: CTSEG_SCHSEG, CTSEG_USCHSEG, CTSEG_VSCHSEG, CTSEG_UVSCHSEG, CTSEG_SCHSRL, described in c-treeDB API definitions. If used with a different segment mode, this call will return error 4047, meaning invalid segment mode. ctdbInsSegmentEx() accepts any segment mode.

Returns

ctdbInsSegment() returns the new segment handle on success, or NULL on failure.

Example

pMyIndex = ctdbGetIndex(pMyTable, 0); // retrieve first index handle

pMyNewIseg = ctdbInsSegment(pMyIndex, 0, , CTSEG_ UREGSEG);

RetVal = ctdbAlterTable(pMyTable, 0);