.leaseConnection()
Lease a new connection from the datastore for use in running multiple queries on the same connection (i.e. so that the logic provided in during can reuse the db connection).
await datastore.leaseConnection(during);
_Or_
var result = await datastore.leaseConnection(during);
Usage
| Argument | Type | Details | |
|---|---|---|---|
| 1 | during | A procedural parameter which Sails will call automatically when a connection has been obtained and made ready for you. It will receive the arguments specified in the "During" usage table below. |
During
| Argument | Type | Details | |
|---|---|---|---|
| 1 | db | Your newly-leased database connection. (See .usingConnection() for more information on what to do with this.) |
Note that prior to Sails 1.1.0, the recommended usage of
.leaseConnection()expected your "during" code to call a callback (proceed) when it finished. This is no longer necessary as long as you do not actually include a second argument in the function signature of your "during" code.
Result
| Type | Details |
|---|---|
The optional result data sent back from during. In other words, if, in your during function, you did return 'foo';, then this will be 'foo'. |
Errors
| Name | Type | When? |
|---|---|---|
| UsageError | Thrown if something invalid was passed in. | |
| AdapterError | Thrown if something went wrong in the database adapter. | |
| Error | Thrown if anything else unexpected happens. |
See Concepts > Models and ORM > Errors for examples of negotiating errors in Sails and Waterline.
Example
Lease a database connection from the default datastore, then use it to send two queries before releasing it back to the pool.
var inventory = await sails.getDatastore()
.leaseConnection(async (db)=> {
var location = await Location.findOne({ id: inputs.locationId })
.usingConnection(db);
if (!location) {
let err = new Error('Cannot find location with that id (`'+inputs.locationId+'`)');
err.code = 'E_NO_SUCH_LOCATION';
throw err;
}
// Get all products at the location
var productOfferings = await ProductOffering.find({ location: inputs.locationId })
.populate('productType')
.usingConnection(db);
return productOfferings;
})
.intercept('E_NO_SUCH_LOCATION', 'notFound');
// All done! Whatever we were doing with that database connection worked.
// Now we can proceed with our business.
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Reference
- Application
- Blueprint API
- Command-line interface
-
Configuration
- sails.config.*
- sails.config.blueprints
- sails.config.bootstrap()
- sails.config.custom
- sails.config.datastores
- sails.config.globals
- sails.config.http
- sails.config.i18n
- sails.config.log
- sails.config.models
- sails.config.policies
- sails.config.routes
- sails.config.security
- sails.config.session
- sails.config.sockets
- sails.config.views
-
Request (`req`)
- req._startTime
- req.body
- req.cookies
- req.fresh
- req.headers
- req.hostname
- req.ip
- req.ips
- req.isSocket
- req.method
- req.options
- req.originalUrl
- req.params
- req.path
- req.protocol
- req.query
- req.secure
- req.signedCookies
- req.socket
- req.subdomains
- req.url
- req.wantsJSON
- req.xhr
- req.accepts()
- req.acceptsCharsets()
- req.acceptsLanguages()
- req.allParams()
- req.file()
- req.get()
- req.is()
- req.param()
- req.setLocale()
- req.setTimeout()
- req.host
- Response (`res`)
- Waterline (ORM)
- WebSockets
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