createindex - create an index

SYNOPSIS

int createindex(ddic, idxfile, indname, table, field, unique, type)
DDIC    *ddic;
char    *idxfile;
char    *indname;
char    *table;
char    *field;
int     unique;
int     type;

DESCRIPTION
This function is used to create an index. Ddic is an open DDIC structure, which defines the database that contains the table to be indexed. Idxfile is the filename to use to create the index. If it is not a full path it will be created in the index directory for the database (default: the same directory as all the other database files). Indname contains the logical name of the index. This is the name that is referred to when dropping the index.

Table and field contain the names of the table in ddic, and the field that are to be indexed. If the last character of the field name is '-' then the index will be a descending index. Unique defines whether the index should be a unique index. Currently the index will be created unique, but no check is currently made when inserting a row.

Type defines what sort of index you want created. The types that are currently know are as follows:

INDEX_BTREE

A btree index. This index is used for rapid retrieval of particular values or ranges of values. It is similar to the indexes found in many databases. (In SQL 'CREATE INDEX ...')

INDEX_UNIQUE

A unique btree index. This index is used for rapid retrieval of particular values or ranges of values while ensuring that each value only occurs once. It is similar to the indexes found in many databases. (In SQL 'CREATE UNIQUE INDEX ...')

INDEX_MM

A Metamorph index. This is a special type of index used to index text fields. It's use is to speed up searches using LIKE, and to provide the searches LIKE3 and LIKER. (In SQL 'CREATE METAMORPH INDEX ...')

INDEX_FULL

A Metamorph inverted index. This is a special type of index used to index text fields. It's use is to speed up searches using LIKE and LIKEP. (In SQL 'CREATE METAMORPH INVERTED INDEX ...')

INDEX_INV

Another special type of index. This index has strict limitations, but speeds up a class of queries dramatically. The field being indexed must be an UNSIGNED INT or dword. It speeds up queries where you need to order by that field. (In SQL 'CREATE INVERTED INDEX ...')

Returns 0 on success and -1 on failure.

SEE ALSO
createdbtbl()