JS Contract

DBIterator

DBIterator Object

Member attribute

data

Query the current data and return all data objects, each of which is a new DBIterator object

Type: Object

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DBIterator.data;

Example:

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exports.hi1 = v => {
    var players = db.players(action.account, action.account);
    var itr = players.find(v);
    console.log(itr.data);
}；

Member attribute

is_begin

Check whether it is the begin of data

Type: Boolean

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DBIterator.is_begin();

Example: 

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exports.hi1 = v => {
    var players = db.players(action.account, action.account);
    var itr = players.find(v);
    console.log(itr.is_begin());
}；

is_end

Check whether it is the end of data

Type: Boolean

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DBIterator.is_end();

Example: 

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exports.hi1 = v => {
    var players = db.players(action.account, action.account);
    var itr = players.find(v);
    console.log(itr.is_end());
}；

next

Get next data

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DBIterator.next();

Example: 

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exports.hi1 = v => {
    var players = db.players(action.account, action.account);
    var itr = players.find(v);
    var itr1 = itr.next();
    console.log(itr1.toJSON());
}；

previous

get previous data

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DBIterator.previous();

Example: 

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exports.hi1 = v => {
    var players = db.players(action.account, action.account);
    var itr = players.find(v);
    var itr1 = itr.next();
    var itr2 = itr1.previous();
    console.log(itr2.toJSON());
}；

remove

remove data

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DBIterator.remove();

Example: 

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exports.hi1 = v => {
    var players = db.players(action.account, action.account);
    var itr = players.find(v);
    itr.remove();
}；

update

update data

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DBIterator.update(payer);

Parameters Usage:

Example: 

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exports.hi1 = v => {
    var players = db.players(action.account, action.account);
    var itr = players.find(v);
    itr.data.age = 18;
    itr.update(action.account);
}；

toString

Return a string representation of an Object，typically “[Native Object]”，Objects can be reimplemented according to their own characteristics

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DBIterator.toString();

Results:

toJSON

Return a JSON format representation of an object, which typically returns a collection of human-readable properties defined by the object

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DBIterator.toJSON(key);

Parameters Usage:

Results: