本文整理汇总了TypeScript中sqlcmd-pg.Connection类的典型用法代码示例。如果您正苦于以下问题：TypeScript Connection类的具体用法？TypeScript Connection怎么用？TypeScript Connection使用的例子？那么, 这里精选的类代码示例或许可以为您提供帮助。
在下文中一共展示了Connection类的5个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的TypeScript代码示例。
示例1: Connection
import {Connection} from 'sqlcmd-pg'
interface Package {
id: number
name: string
}
interface Statistic {
package_id?: number
day: Date
downloads: number
}
export const db = new Connection({
host: '127.0.0.1',
port: 5432,
database: 'npm-history',
})
// connect db log events to local logger
db.on('log', ev => {
const args = [ev.format].concat(ev.args)
logger[ev.level].apply(logger, args)
})
const NPM_EPOCH = new Date('2009-09-29')
/**
Custom-built 'INSERT INTO <table> (<columns>) VALUES (<row1>), (<row2>), ...;'
SQL query for inserting statistic rows. I don't think there are any limits on
the number of parameters you can have in a prepared query.示例2: callback
.execute((error: Error, rows: Package[]) => {
if (error) return callback(error)
if (rows.length > 0) return callback(null, rows[0])
db.Insert('package')
.set({name}).returning('*')
.execute((insertError: Error, insertRows: Package[]) => {
if (insertError) return callback(insertError)
return callback(null, insertRows[0])
})
})示例3: getRangeStatistics
getRangeStatistics(name, start, end, (statsError, statistics) => {
if (statsError) return callback(statsError)
// 5. save the values we just fetched
const [sql, args] = buildMultirowInsert(package_row.id, statistics)
db.executeSQL(sql, args, (sqlError: Error) => {
if (sqlError) return callback(sqlError)
// 6. merge local and new statistics for the response
const total_statistics = statistics.concat(local_statistics).sort((a, b) => a.day.getTime() - b.day.getTime())
callback(null, total_statistics)
})
})示例4: findOrCreatePackage
/**
Given a package name, return the full package row from the database, creating
one if needed.
*/
function findOrCreatePackage(name: string, callback: (error: Error, package_row?: Package) => void) {
db.Select('package')
.whereEqual({name})
.execute((error: Error, rows: Package[]) => {
if (error) return callback(error)
if (rows.length > 0) return callback(null, rows[0])
db.Insert('package')
.set({name}).returning('*')
.execute((insertError: Error, insertRows: Package[]) => {
if (insertError) return callback(insertError)
return callback(null, insertRows[0])
})
})
}示例5: queryAverageDownloads
export function queryAverageDownloads(start: moment.Moment,
end: moment.Moment,
callback: (error: Error, packages?: {[index: string]: number}) => void) {
db.Select('package_statistic')
.add('name', 'AVG(downloads)::int AS average')
.where('downloads > -1')
.where('day >= ?', start.toDate())
.where('day < ?', end.toDate())
.groupBy('name')
.orderBy('name')
.execute((error: Error, rows: {name: string, average: number}[]) => {
if (error) return callback(error)
logger.info('averaged downloads for %d packages', rows.length)
const packages: {[index: string]: number} = {}
rows.forEach(row => packages[row.name] = row.average)
callback(null, packages)
})
}