Indexed Database API3. Constructs. 3. 1. Database. A database's origin is the same as the origin of the document or worker. A database comprises.

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The name can be any string value, including the empty string, and. Each database also has a current.

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When a database is first created, its version is 0. If an implementation. The only way to change the version is using a . When a database is requested. There MAY be multiple.

Each connection has a. Pending flag which initially is set to false. The connection. can be closed through several means. If the connection is GCed. The connection can also be closed. When the connection is closed.

Pending flag is always set to true if it hasn't already been. Unable To Uninstall Adobe Illustrator Cs2 Key. The set of object stores can be changed. When a new database is created it doesn't contain any object stores. Each record consists of a key and a value. There can never be multiple records in a given object. Every object store also optionally has a. Otherwise it is said to.

A key generator generates a monotonically increasing numbers every time. Note however that multiple instances of those. A value is said to be a valid key. ECMAScript . As are empty Arrays. Values of type Number are compared to other Number values.

Values of type Date are compared to other Date values chronologically. Skip the remaining steps. Skip the remaining steps. Otherwise continue to next step. If A's length is greater than B's length, then.

A is greater than B. Otherwise A and B are equal. Conforming user agents. MUST support. any ECMAScript . This includes simple types such as String primitive values. Date objects as well as Object and Array.

File objects, Blob objects, Image. Data. objects, and so on.

Record values are stored and retrieved. A valid key path is one of.

An empty DOMString. An identifier, which is a DOMString matching. Identifier. Name production from the ECMAScript Language Specification . An index allows looking up records in an object store. The records in an index are automatically populated whenever records in the. There can be several indexes. The keys are derived from the referenced object store's values using a key path.

This is the value of the record in the index's referenced. So in the example above. Y and value is X has a referenced value of A.

However there can be. And there can also be no records in an index. However unlike object stores.

Such records are additionally sorted according to. The name is unique within index's referenced object store. When this flag is set to true, the index enforces that no two records.

If a record in the index's referenced object store is attempted to be inserted or. This flag affects how the index behaves when the result of evaluating. Array. If the multi.

Entry flag is false, then. Array is added to the index. If the multi. Entry flag is. Array. The key for each.

Array. Note however that multiple instances of those. The mode is set when the transaction is created and remains. The transaction also has a scope that. Transactions. have an active flag, which determines if new requests can be made. Finally, transactions also contain a request list of. A transaction may be used to.

A transaction represents an atomic and durable set. This is encouraged. Authors can still cause. This is the case even if the transaction has not yet been.

Until the transaction is started. MUST NOT execute these requests; however, the implementation MUST keep track of the. Requests may be placed against a transaction only while that transaction.

If an attempt is made to place a request against a transaction when that transaction is not. MUST reject the attempt by. DOMException of type Transaction.

Inactive. Error. Unless otherwise defined, requests. MUST be executed in the order in which they were made against the transaction. Likewise, their results MUST. This includes both changes to the contents of.

For example due to IO errors. In this case the implementation MUST run the. For example if quota was exceeded then Quota. Exceeded. Error should.

IO error happened, Unknown. Error should be used as.

When a transaction is committed, the implementation MUST atomically write. That is, either all. MUST be written, or if an error occurs, such as a disk write error, the implementation. MUST NOT write any of the changes to the database. If such an error occurs, the implementation MUSTabort the transaction by following the steps for aborting a transaction, otherwise it. MUSTcommit the transaction by following the steps for committing a transaction.

If a transaction can't be finished, for example. MUSTabort the transaction. The mode. determines how concurrent access to object stores in the transaction are isolated. No modifications can be done by this type of transaction.

This has the advantage. This type of transaction can. IDBDatabase. transaction. However object stores and indexes can't be added or removed. It is the only type of. This type of transaction can't be manually created, but instead is created. That is, two requests to read the same piece of data MUST yield the same result.

The implementation can prevent any. Or the implementation can allow the .

For example, the. MUST ensure that another transaction does not modify the contents of. The implementation. MUST also ensure that if the . An implementation MUST NOT abort a transaction.

Due to. the requirements in the previous paragraph, this also means that it is the only transaction. So if. . Due to the. B transaction does not have access to any. A transaction. is finished. The upgradeneeded event isn't fired, and thus the. This ensures that all other transactions are finished. For example, if multiple .

Every request. also has a result and an error attribute. When a request is created, it is. A. key range is a continuous interval over some data type. Set to true if the lower- bound value should. Defaults to false (lower- bound value is included). Openboolean = false.

Set to true if the upper- bound value should. Defaults to false (upper- bound value is included). Bound, static. Creates and returns a new key range with lower set to. Open set to open.

Open set to true. Set to true if the lower- bound value should. Defaults to false (lower- bound value is included). Creates and returns a new key range with both lower and. Open and upper. Open.

Set to true if the upper- bound value should. Defaults to false (upper- bound value is included). The cursor has a source that indicates. Cursors. also have a key and a value.

When this flag is false, the cursor is either. The direction of a cursor determines. The allowed values for a cursor's direction is as follows.

IDBCursor. Direction . When iterated, the cursor should yield all records, including. This direction causes the cursor to be opened at the start of the. When iterated, the cursor should not yield records with. For every key. with duplicate values, only the first record is yielded. When the source is.

When iterated, the cursor should yield all records, including. This direction causes the cursor to be opened at the end of the. When iterated, the cursor should not yield records with. For every key. with duplicate values, only the first record is yielded.

When the source is. In order to. handle this, cursors maintain their position not as an index, but rather. For a forward iterating cursor. For. a backwards iterating cursor, the situation is opposite and it returns the record. Both. position and the object store position are used when finding the next appropriate record.

There is only ever one. IDBCursor. instance representing. However there is no limit on how many cursors can be used at the. For example transaction creation attempt was made. The attributes on the object. The current number.

Whenever the key generator is used to generate a new key, the. Implementations MUST use the following rules. Nor do DOMString values which. Negative Numbers. This applies both to modifications. Deleting a record from an object store.

Even clearing all records from an. The same key is never generated. This is to make all rollbacks. Exampledb. create. Object. Store(. Various.

This is null when no error occurred.