Apple Newton Utilities Uživatelská příručka stáhnout pdf (Strana 501)

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CHAPTER 11

Data Storage and Retrieval

Summary of Data Storage 11-69

Multiple-Slot Index Speciﬁcation Frame 11

{

// index keys may be multiple slot values

structure: 'multiSlot, // must use this value

// up to six path expressions specifying indexed slots

path:[pathExpr1, pathExpr2, … , pathExpr6],

// data type found in each indexed slot

type:[sym1, sym2, … sym6]

// optional. 'ascending or 'descending

order: [sym1, sym2, … sym6 ]

// optional. pass 1 to use alternate sort table

sortID: nil

}

Tags Index Speciﬁcation Frame 11

{

// must use this value - tags are slot values

structure:'slot,

// index values (tags) extracted from this slot

path:'slotName,

// must use this value

type:'tags,

}

Query Speciﬁcation Frame 11

// pass nil instead of a query spec frame

// to retrieve all entries in the soup

// this frame used for queries on single-slot indexes

// see next example for multiple-slot query spec frame

{

// use the specified single-slot index for this query

// required when querying for index values

indexPath : 'pathExpr,

// minimum index key value examined by this query

// for all entries, (beginKey ≤ entry.indexPath)

beginKey : keyValue, // optional

// excluded lower boundary of key range examined by query

// for all entries, (beginExclKey < entry.indexPath)

beginExclKey : keyValue, // optional

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