Hyperledger Fabric Tutorial (13)-Integrate CouchDB as a state database

1. Download the mirror

Fabric uses levelDB by default

 

If it is a low-version fabric, please download the corresponding couchdb according to this https://blog.csdn.net/u013288190/article/details/112333006

 

Second, the configuration file

vim docker-compose-couch.yaml

The configuration in the configuration file means that the configuration parameters of couchdb are appended to the node's container

 

Three, how to start

1. Close the original

./byfn.sh -m down

2. Generate a new configuration

./byfn.sh -m generate -s couchdb

3. Start

./byfn.sh -m up -s couchdb

 

Four, browser access

1. Visiting address

http://localhost:5984/_utils/#/_all_dbs

 

 

mycc is the name of a certain chain code

Variables a and b in the contract are exclusive

 

2. Binary attachment format

The value here is a binary attachment.

The chain code can refer to:

 

3. json format

It can also be set to json format.

The chain code can refer to