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index.js
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index.js
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const symbol = Symbol('sql-pg')
function sql (textFragments, ...valueFragments) {
const build = parameterPosition => {
const query = {
text: textFragments[0],
parameters: []
}
valueFragments.forEach((valueFragment, i) => {
if (typeof valueFragment !== 'function') {
valueFragment = sql.value(valueFragment)
}
valueFragment = valueFragment(parameterPosition + query.parameters.length)
query.text += valueFragment.text + textFragments[i + 1]
query.parameters = query.parameters.concat(valueFragment.parameters)
})
return query
}
return Object.assign(build, build(0), { symbol })
}
sql.query = (...params) => {
if (typeof sql.client !== 'object' || typeof sql.client.query !== 'function') {
throw Error('Missing assignment of the initialized pg client to "sql.client"')
}
const [query] = params
if (typeof query !== 'function' || query.symbol !== symbol) {
throw Error('Only queries created with the sql tagged template literal are allowed')
}
return sql.client.query(...params)
}
sql.transaction = async (callback) => {
await sql.query(sql`BEGIN`)
try {
await callback()
await sql.query(sql`COMMIT`)
} catch (e) {
await sql.query(sql`ROLLBACK`)
throw e
}
}
sql.defaultSerialColumn = 'id'
sql.insert = async (...params) => {
if (typeof params[0] === 'string') {
let [table, rows, { keys, serialColumn: serialColumn = sql.defaultSerialColumn } = {}] = params
let array = true
if (!Array.isArray(rows)) {
rows = [rows]
array = false
}
if (!keys) {
keys = Object.keys(rows[0])
}
const result = await sql.query(sql`INSERT INTO ${sql.key(table)} (${sql.keys(keys)}) VALUES ${sql.valuesList(rows, { keys })} RETURNING ${sql.key(serialColumn)}`)
if (!array) {
return result.rows[0][serialColumn]
}
return result.rows.map(row => row[serialColumn])
}
const [query, { serialColumn: serialColumn = sql.defaultSerialColumn } = {}] = params
const result = await sql.query(query)
return result.rows.map(row => row[serialColumn])
}
sql.update = async (...params) => {
if (typeof params[0] === 'string') {
const [table, updates, conditions] = params
params = [sql`UPDATE ${sql.key(table)} SET ${sql.assignments(updates)} WHERE ${sql.conditions(conditions)}`]
}
const [query] = params
const result = await sql.query(query)
return result.rowCount
}
sql.delete = async (...params) => {
if (typeof params[0] === 'string') {
const [table, conditions] = params
params = [sql`DELETE FROM ${sql.key(table)} WHERE ${sql.conditions(conditions)}`]
}
const [query] = params
const result = await sql.query(query)
return result.rowCount
}
sql.any = async (...params) => {
if (typeof params[0] === 'string') {
let [table, columns, conditions] = params
if (!conditions) {
conditions = columns
columns = ['*']
}
params = [sql`SELECT ${sql.keys(columns)} FROM ${sql.key(table)} WHERE ${sql.conditions(conditions)}`]
}
const [query] = params
const result = await sql.query(query)
return result.rows
}
sql.manyOrNone = sql.any
sql.many = async (...params) => {
const rows = await sql.any(...params)
if (rows.length === 0) {
throw new Error('Expects to have at least one row in the query result')
}
return rows
}
sql.oneOrNone = async (...params) => {
const rows = await sql.any(...params)
if (rows.length > 1) {
throw new Error('Expects to have not more than one row in the query result')
}
return rows[0]
}
sql.one = async (...params) => {
const row = await sql.oneOrNone(...params)
if (!row) {
throw new Error('Expects to have one row in the query result')
}
return row
}
function escapeKey (key) {
return `"${key.replace(/"/g, '""')}"`
}
sql.keys = keys => {
if (!Array.isArray(keys)) {
keys = Object.keys(keys)
}
return () => ({
text: keys.map(escapeKey).join(', '),
parameters: []
})
}
sql.key = key => sql.keys([key])
sql.values = (values, { keys: keys = Object.keys(values) } = {}) => {
if (!Array.isArray(values)) {
values = keys.map(key => values[key])
}
return parameterPosition => ({
text: Array.apply(null, { length: values.length }).map(() => `$${++parameterPosition}`).join(', '),
parameters: values
})
}
sql.value = value => sql.values([value])
sql.valuesList = (valuesList, { keys: keys = Object.keys(valuesList[0]) } = {}) =>
parameterPosition => {
const queries = []
for (const values of valuesList) {
const query = sql.values(values, { keys })(parameterPosition)
queries.push({
text: `(${query.text})`,
parameters: query.parameters
})
parameterPosition += query.parameters.length
}
return queries.reduce(
(queryA, queryB) => ({
text: queryA.text + (queryA.text ? ', ' : '') + queryB.text,
parameters: queryA.parameters.concat(queryB.parameters)
}),
{ text: '', parameters: [] }
)
}
function pairs (pairs, separator) {
return parameterPosition => {
const queries = []
for (const key of Object.keys(pairs)) {
const value = sql.value(pairs[key])(parameterPosition++)
queries.push({
text: `${escapeKey(key)} = ${value.text}`,
parameters: value.parameters
})
}
return queries.reduce(
(queryA, queryB) => ({
text: queryA.text + (queryA.text ? separator : '') + queryB.text,
parameters: queryA.parameters.concat(queryB.parameters)
}),
{ text: '', parameters: [] }
)
}
}
sql.assignments = assignments => pairs(assignments, ', ')
sql.conditions = conditions => pairs(conditions, ' AND ')
function positiveNumber (number, fallback) {
number = parseInt(number, 10)
if (number > 0) {
return number
}
return fallback
}
sql.defaultFallbackLimit = 10
sql.defaultMaxLimit = 100
sql.limit = (limit, { fallbackLimit: fallbackLimit = sql.defaultFallbackLimit, maxLimit: maxLimit = sql.defaultMaxLimit } = {}) =>
() => ({
text: `LIMIT ${Math.min(positiveNumber(limit, fallbackLimit), maxLimit)}`,
parameters: []
})
sql.offset = offset =>
() => ({
text: `OFFSET ${positiveNumber(offset, 0)}`,
parameters: []
})
sql.defaultPageSize = 10
sql.pagination = (page, { pageSize: pageSize = sql.defaultPageSize } = {}) =>
() => ({
text: `${sql.limit(pageSize)().text} ${sql.offset(page * pageSize)().text}`,
parameters: []
})
sql.if = (condition, truly, falsy = () => ({ text: '', parameters: [] })) => condition ? truly : falsy
module.exports = sql