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index.js
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// MSSQL Client
// -------
import { assign, map, flatten, values } from 'lodash'
import inherits from 'inherits';
import Client from '../../client';
import Promise from 'bluebird';
import Formatter from '../../formatter'
import Transaction from './transaction';
import QueryCompiler from './query/compiler';
import SchemaCompiler from './schema/compiler';
import TableCompiler from './schema/tablecompiler';
import ColumnCompiler from './schema/columncompiler';
const { isArray } = Array;
const SQL_INT4 = { MIN : -2147483648, MAX: 2147483647}
const SQL_BIGINT_SAFE = { MIN : -9007199254740991, MAX: 9007199254740991}
// Always initialize with the "QueryBuilder" and "QueryCompiler" objects, which
// extend the base 'lib/query/builder' and 'lib/query/compiler', respectively.
function Client_MSSQL(config = {}) {
// #1235 mssql module wants 'server', not 'host'. This is to enforce the same
// options object across all dialects.
if(config && config.connection && config.connection.host) {
config.connection.server = config.connection.host;
}
// mssql always creates pool :( lets try to unpool it as much as possible
this.mssqlPoolSettings = {
min: 1,
max: 1,
idleTimeoutMillis: Number.MAX_SAFE_INTEGER,
evictionRunIntervalMillis: 0
};
Client.call(this, config);
}
inherits(Client_MSSQL, Client);
assign(Client_MSSQL.prototype, {
dialect: 'mssql',
driverName: 'mssql',
_driver() {
const tds = require('tedious');
const mssqlTedious = require('mssql');
const base = require('mssql/lib/base');
// Monkey patch mssql's tedious driver _poolCreate method to fix problem with hanging acquire
// connection, this should be removed when https://github.com/tediousjs/node-mssql/pull/614 is
// merged and released.
// Also since this dialect actually always uses tedious driver (msnodesqlv8 driver should be
// required in different way), it might be better to use tedious directly, because mssql
// driver uses always internally extra generic-pool and just adds one unnecessary layer of
// indirection between database and knex and mssql driver has been lately without maintainer
// (changing implementation to use tedious will be breaking change though).
// TODO: remove mssql implementation all together and use tedious directly
const mssqlVersion = require('mssql/package.json').version;
if (mssqlVersion !== '4.1.0') {
throw new Error(
'This knex version does not support any other mssql version except 4.1.0 ' +
'(knex patches bug in its implementation)');
}
mssqlTedious.ConnectionPool.prototype.release = release;
mssqlTedious.ConnectionPool.prototype._poolCreate = _poolCreate;
// in some rare situations release is called when stream is interrupted, but
// after pool is already destroyed
function release(connection) {
if (this.pool) {
this.pool.release(connection);
}
}
function _poolCreate() {
// implementation is copy-pasted from https://github.com/tediousjs/node-mssql/pull/614
return new base.Promise((resolve, reject) => {
const cfg = {
userName: this.config.user,
password: this.config.password,
server: this.config.server,
options: Object.assign({}, this.config.options),
domain: this.config.domain
}
cfg.options.database = this.config.database
cfg.options.port = this.config.port
cfg.options.connectTimeout = this.config.connectionTimeout || this.config.timeout || 15000
cfg.options.requestTimeout =
this.config.requestTimeout != null ? this.config.requestTimeout : 15000
cfg.options.tdsVersion = cfg.options.tdsVersion || '7_4'
cfg.options.rowCollectionOnDone = false
cfg.options.rowCollectionOnRequestCompletion = false
cfg.options.useColumnNames = false
cfg.options.appName = cfg.options.appName || 'node-mssql'
// tedious always connect via tcp when port is specified
if (cfg.options.instanceName) delete cfg.options.port
if (isNaN(cfg.options.requestTimeout)) cfg.options.requestTimeout = 15000
if (cfg.options.requestTimeout === Infinity) cfg.options.requestTimeout = 0
if (cfg.options.requestTimeout < 0) cfg.options.requestTimeout = 0
if (this.config.debug) {
cfg.options.debug = {
packet: true,
token: true,
data: true,
payload: true
}
}
const tedious = new tds.Connection(cfg)
// prevent calling resolve again on end event
let alreadyResolved = false
function safeResolve (err) {
if (!alreadyResolved) {
alreadyResolved = true
resolve(err)
}
}
function safeReject (err) {
if (!alreadyResolved) {
alreadyResolved = true
reject(err)
}
}
tedious.once('end', evt => {
safeReject(new base.ConnectionError('Connection ended unexpectedly during connecting'))
})
tedious.once('connect', err => {
if (err) {
err = new base.ConnectionError(err)
return safeReject(err)
}
safeResolve(tedious)
})
tedious.on('error', err => {
if (err.code === 'ESOCKET') {
tedious.hasError = true
return
}
this.emit('error', err)
})
if (this.config.debug) {
tedious.on('debug', this.emit.bind(this, 'debug', tedious))
}
})
}
return mssqlTedious;
},
formatter() {
return new MSSQL_Formatter(this, ...arguments)
},
transaction() {
return new Transaction(this, ...arguments)
},
queryCompiler() {
return new QueryCompiler(this, ...arguments)
},
schemaCompiler() {
return new SchemaCompiler(this, ...arguments)
},
tableCompiler() {
return new TableCompiler(this, ...arguments)
},
columnCompiler() {
return new ColumnCompiler(this, ...arguments)
},
wrapIdentifierImpl(value) {
return (value !== '*' ? `[${value.replace(/\[/g, '[')}]` : '*')
},
// Get a raw connection, called by the `pool` whenever a new
// connection needs to be added to the pool.
acquireRawConnection() {
return new Promise((resolver, rejecter) => {
const settings = Object.assign({}, this.connectionSettings);
settings.pool = this.mssqlPoolSettings;
const connection = new this.driver.ConnectionPool(settings);
connection.connect((err) => {
if (err) {
return rejecter(err)
}
connection.on('error', (err) => {
connection.__knex__disposed = err
})
resolver(connection);
});
});
},
validateConnection(connection) {
if (connection.connected === true) {
return true
}
return false
},
// Used to explicitly close a connection, called internally by the pool
// when a connection times out or the pool is shutdown.
destroyRawConnection(connection) {
return connection.close().catch(err => {
// some times close will reject just because pool has already been destoyed
// internally by the driver there is nothing we can do in this case
});
},
// Position the bindings for the query.
positionBindings(sql) {
let questionCount = -1
return sql.replace(/\?/g, function() {
questionCount += 1
return `@p${questionCount}`
})
},
// Grab a connection, run the query via the MSSQL streaming interface,
// and pass that through to the stream we've sent back to the client.
_stream(connection, obj, stream, options) {
options = options || {}
if (!obj || typeof obj === 'string') obj = {sql: obj}
return new Promise((resolver, rejecter) => {
stream.on('error', (err) => {
rejecter(err)
});
stream.on('end', resolver);
const { sql } = obj
if (!sql) return resolver()
const req = (connection.tx_ || connection).request();
//req.verbose = true;
req.multiple = true;
req.stream = true;
if (obj.bindings) {
for (let i = 0; i < obj.bindings.length; i++) {
this._setReqInput(req, i, obj.bindings[i])
}
}
req.pipe(stream)
req.query(sql)
})
},
// Runs the query on the specified connection, providing the bindings
// and any other necessary prep work.
_query(connection, obj) {
const client = this;
if (!obj || typeof obj === 'string') obj = {sql: obj}
return new Promise((resolver, rejecter) => {
const { sql } = obj
if (!sql) return resolver()
const req = (connection.tx_ || connection).request();
// req.verbose = true;
req.multiple = true;
if (obj.bindings) {
for (let i = 0; i < obj.bindings.length; i++) {
client._setReqInput(req, i, obj.bindings[i])
}
}
req.query(sql, (err, recordset) => {
if (err) {
return rejecter(err)
}
obj.response = recordset.recordsets[0]
resolver(obj)
})
})
},
// sets a request input parameter. Detects bigints and decimals and sets type appropriately.
_setReqInput(req, i, binding) {
if (typeof binding == 'number') {
if (binding % 1 !== 0) {
req.input(`p${i}`, this.driver.Decimal(38, 10), binding)
} else if (binding < SQL_INT4.MIN || binding > SQL_INT4.MAX) {
if (binding < SQL_BIGINT_SAFE.MIN || binding > SQL_BIGINT_SAFE.MAX) {
throw new Error(`Bigint must be safe integer or must be passed as string, saw ${binding}`)
}
req.input(`p${i}`, this.driver.BigInt, binding)
} else {
req.input(`p${i}`, this.driver.Int, binding)
}
} else {
req.input(`p${i}`, binding)
}
},
// Process the response as returned from the query.
processResponse(obj, runner) {
if (obj == null) return;
const { response, method } = obj
if (obj.output) return obj.output.call(runner, response)
switch (method) {
case 'select':
case 'pluck':
case 'first':
if (method === 'pluck') return map(response, obj.pluck)
return method === 'first' ? response[0] : response
case 'insert':
case 'del':
case 'update':
case 'counter':
if (obj.returning) {
if (obj.returning === '@@rowcount') {
return response[0]['']
}
if (
(isArray(obj.returning) && obj.returning.length > 1) ||
obj.returning[0] === '*'
) {
return response;
}
// return an array with values if only one returning value was specified
return flatten(map(response, values));
}
return response;
default:
return response
}
}
})
class MSSQL_Formatter extends Formatter {
// Accepts a string or array of columns to wrap as appropriate.
columnizeWithPrefix(prefix, target) {
const columns = typeof target === 'string' ? [target] : target
let str = '', i = -1;
while (++i < columns.length) {
if (i > 0) str += ', '
str += prefix + this.wrap(columns[i])
}
return str
}
}
export default Client_MSSQL