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levelDb put call not storing complex Json object properly

Can integer keys / values be stored in LevelDB?Anyone used LevelDB store for ActiveMQ message persistence?How to store list of associated entities in LevelDBminimum activemq cluster size with replicated leveldb storeWill leveldb method put update a value?10 million puts failing in LevelDBIs private token-free blockchains valid solution for one-off services?LevelDB and trie like structures saved in them traversal enhancementWhy is previousHash not showing when I console.log my test blockchain?

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0

I am trying to create a private blockchain using LevelDb and having some issues storing complex json object in levelDb.

If i try to save simple string or number as a value, it works, but when i try to store a complex object like mentioned below, while retrieving it always giving me [object Object]. Please see code below.

class Test 
 constructor() 
 this.level = require('level')

 // 1) Create our database, supply location and options.
 // This will create or open the underlying store.
 this.db = this.level('my-db')



 test() 
 const self = this;
 // 2) Put a key & value
 self.db.put('name', 
 a: 123,
 b: 234,
 c: 
 d: 'dddddd'
 
 , function (err) 
 if (err) return console.log('Ooops!', err) // some kind of I/O error

 // 3) Fetch by key
 self.db.get('name', function (err, value) 
 if (err) return console.log('Ooops!', err) // likely the key was not found

 // Ta da!
 console.log('name=' + JSON.parse(JSON.stringify(value))); // Does not work shows [object Object]
 // console.log('name=' + JSON.stringify(value)); // Does not work shows [object Object] 
 // console.log('name=' + JSON.parse(value)); // Does not work shows ERROR SyntaxError: Unexpected token o in JSON at position 1
 )
 )
 

blockchain leveldb

share|improve this question

edited Mar 26 at 22:32

ATHER

asked Mar 26 at 19:22

ATHERATHER

1,37844 gold badges2424 silver badges4646 bronze badges

add a comment | 

0

I am trying to create a private blockchain using LevelDb and having some issues storing complex json object in levelDb.

If i try to save simple string or number as a value, it works, but when i try to store a complex object like mentioned below, while retrieving it always giving me [object Object]. Please see code below.

class Test 
 constructor() 
 this.level = require('level')

 // 1) Create our database, supply location and options.
 // This will create or open the underlying store.
 this.db = this.level('my-db')



 test() 
 const self = this;
 // 2) Put a key & value
 self.db.put('name', 
 a: 123,
 b: 234,
 c: 
 d: 'dddddd'
 
 , function (err) 
 if (err) return console.log('Ooops!', err) // some kind of I/O error

 // 3) Fetch by key
 self.db.get('name', function (err, value) 
 if (err) return console.log('Ooops!', err) // likely the key was not found

 // Ta da!
 console.log('name=' + JSON.parse(JSON.stringify(value))); // Does not work shows [object Object]
 // console.log('name=' + JSON.stringify(value)); // Does not work shows [object Object] 
 // console.log('name=' + JSON.parse(value)); // Does not work shows ERROR SyntaxError: Unexpected token o in JSON at position 1
 )
 )
 

blockchain leveldb

share|improve this question

edited Mar 26 at 22:32

ATHER

asked Mar 26 at 19:22

ATHERATHER

1,37844 gold badges2424 silver badges4646 bronze badges

add a comment | 

I am trying to create a private blockchain using LevelDb and having some issues storing complex json object in levelDb.

If i try to save simple string or number as a value, it works, but when i try to store a complex object like mentioned below, while retrieving it always giving me [object Object]. Please see code below.

class Test 
 constructor() 
 this.level = require('level')

 // 1) Create our database, supply location and options.
 // This will create or open the underlying store.
 this.db = this.level('my-db')



 test() 
 const self = this;
 // 2) Put a key & value
 self.db.put('name', 
 a: 123,
 b: 234,
 c: 
 d: 'dddddd'
 
 , function (err) 
 if (err) return console.log('Ooops!', err) // some kind of I/O error

 // 3) Fetch by key
 self.db.get('name', function (err, value) 
 if (err) return console.log('Ooops!', err) // likely the key was not found

 // Ta da!
 console.log('name=' + JSON.parse(JSON.stringify(value))); // Does not work shows [object Object]
 // console.log('name=' + JSON.stringify(value)); // Does not work shows [object Object] 
 // console.log('name=' + JSON.parse(value)); // Does not work shows ERROR SyntaxError: Unexpected token o in JSON at position 1
 )
 )
 

blockchain leveldb

share|improve this question

edited Mar 26 at 22:32

ATHER

asked Mar 26 at 19:22

ATHERATHER

1,37844 gold badges2424 silver badges4646 bronze badges

class Test 
 constructor() 
 this.level = require('level')

 // 1) Create our database, supply location and options.
 // This will create or open the underlying store.
 this.db = this.level('my-db')



 test() 
 const self = this;
 // 2) Put a key & value
 self.db.put('name', 
 a: 123,
 b: 234,
 c: 
 d: 'dddddd'
 
 , function (err) 
 if (err) return console.log('Ooops!', err) // some kind of I/O error

 // 3) Fetch by key
 self.db.get('name', function (err, value) 
 if (err) return console.log('Ooops!', err) // likely the key was not found

 // Ta da!
 console.log('name=' + JSON.parse(JSON.stringify(value))); // Does not work shows [object Object]
 // console.log('name=' + JSON.stringify(value)); // Does not work shows [object Object] 
 // console.log('name=' + JSON.parse(value)); // Does not work shows ERROR SyntaxError: Unexpected token o in JSON at position 1
 )
 )
 

share|improve this question

edited Mar 26 at 22:32

ATHER

asked Mar 26 at 19:22

ATHERATHER

1,37844 gold badges2424 silver badges4646 bronze badges

share|improve this question

edited Mar 26 at 22:32

ATHER

asked Mar 26 at 19:22

ATHERATHER

1,37844 gold badges2424 silver badges4646 bronze badges

asked Mar 26 at 19:22

ATHERATHER

1,37844 gold badges2424 silver badges4646 bronze badges

asked Mar 26 at 19:22

ATHERATHER

1,37844 gold badges2424 silver badges4646 bronze badges

1 Answer
1

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oldest

votes

0

ok i fixed it by using JSON.stringify(complexJsonObject) with put call like this

test() 
 const self = this;
 // 2) Put a key & value
 self.db.put('name', JSON.stringify(
 a: 123,
 b: 234,
 c: 
 d: 'dddddd'
 
 ), function (err) 
 if (err) return console.log('Ooops!', err) // some kind of I/O error

 // 3) Fetch by key
 self.db.get('name', function (err, value) 
 if (err) return console.log('Ooops!', err) // likely the key was not found

 // Ta da!
 console.log('name=' + JSON.parse(JSON.stringify(value))); // Does not work shows [object Object]
 // console.log('name=' + JSON.stringify(value)); // Does not work shows [object Object] 
 // console.log('name=' + JSON.parse(value)); // Does not work shows ERROR SyntaxError: Unexpected token o in JSON at position 1
 )
 )

share|improve this answer

answered Mar 26 at 22:31

ATHERATHER

1,37844 gold badges2424 silver badges4646 bronze badges

add a comment | 

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0

ok i fixed it by using JSON.stringify(complexJsonObject) with put call like this

test() 
 const self = this;
 // 2) Put a key & value
 self.db.put('name', JSON.stringify(
 a: 123,
 b: 234,
 c: 
 d: 'dddddd'
 
 ), function (err) 
 if (err) return console.log('Ooops!', err) // some kind of I/O error

 // 3) Fetch by key
 self.db.get('name', function (err, value) 
 if (err) return console.log('Ooops!', err) // likely the key was not found

 // Ta da!
 console.log('name=' + JSON.parse(JSON.stringify(value))); // Does not work shows [object Object]
 // console.log('name=' + JSON.stringify(value)); // Does not work shows [object Object] 
 // console.log('name=' + JSON.parse(value)); // Does not work shows ERROR SyntaxError: Unexpected token o in JSON at position 1
 )
 )

share|improve this answer

answered Mar 26 at 22:31

ATHERATHER

1,37844 gold badges2424 silver badges4646 bronze badges

add a comment | 

0

ok i fixed it by using JSON.stringify(complexJsonObject) with put call like this

test() 
 const self = this;
 // 2) Put a key & value
 self.db.put('name', JSON.stringify(
 a: 123,
 b: 234,
 c: 
 d: 'dddddd'
 
 ), function (err) 
 if (err) return console.log('Ooops!', err) // some kind of I/O error

 // 3) Fetch by key
 self.db.get('name', function (err, value) 
 if (err) return console.log('Ooops!', err) // likely the key was not found

 // Ta da!
 console.log('name=' + JSON.parse(JSON.stringify(value))); // Does not work shows [object Object]
 // console.log('name=' + JSON.stringify(value)); // Does not work shows [object Object] 
 // console.log('name=' + JSON.parse(value)); // Does not work shows ERROR SyntaxError: Unexpected token o in JSON at position 1
 )
 )

share|improve this answer

answered Mar 26 at 22:31

ATHERATHER

1,37844 gold badges2424 silver badges4646 bronze badges

add a comment | 

ok i fixed it by using JSON.stringify(complexJsonObject) with put call like this

test() 
 const self = this;
 // 2) Put a key & value
 self.db.put('name', JSON.stringify(
 a: 123,
 b: 234,
 c: 
 d: 'dddddd'
 
 ), function (err) 
 if (err) return console.log('Ooops!', err) // some kind of I/O error

 // 3) Fetch by key
 self.db.get('name', function (err, value) 
 if (err) return console.log('Ooops!', err) // likely the key was not found

 // Ta da!
 console.log('name=' + JSON.parse(JSON.stringify(value))); // Does not work shows [object Object]
 // console.log('name=' + JSON.stringify(value)); // Does not work shows [object Object] 
 // console.log('name=' + JSON.parse(value)); // Does not work shows ERROR SyntaxError: Unexpected token o in JSON at position 1
 )
 )

share|improve this answer

answered Mar 26 at 22:31

ATHERATHER

1,37844 gold badges2424 silver badges4646 bronze badges

test() 
 const self = this;
 // 2) Put a key & value
 self.db.put('name', JSON.stringify(
 a: 123,
 b: 234,
 c: 
 d: 'dddddd'
 
 ), function (err) 
 if (err) return console.log('Ooops!', err) // some kind of I/O error

 // 3) Fetch by key
 self.db.get('name', function (err, value) 
 if (err) return console.log('Ooops!', err) // likely the key was not found

 // Ta da!
 console.log('name=' + JSON.parse(JSON.stringify(value))); // Does not work shows [object Object]
 // console.log('name=' + JSON.stringify(value)); // Does not work shows [object Object] 
 // console.log('name=' + JSON.parse(value)); // Does not work shows ERROR SyntaxError: Unexpected token o in JSON at position 1
 )
 )

share|improve this answer

answered Mar 26 at 22:31

ATHERATHER

1,37844 gold badges2424 silver badges4646 bronze badges

answered Mar 26 at 22:31

ATHERATHER

1,37844 gold badges2424 silver badges4646 bronze badges

answered Mar 26 at 22:31

ATHERATHER

1,37844 gold badges2424 silver badges4646 bronze badges