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673 lines
24 KiB
673 lines
24 KiB
import {EscapeValue, QuerySafeValue, raw, SQLDialect} from './SQLDialect'
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import {Constraint, inverseFieldType, isConstraintGroup, isConstraintItem, QuerySource, SpecifiedField} from '../types'
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import {AbstractBuilder} from '../builder/AbstractBuilder'
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import {ColumnBuilder, ConstraintBuilder, ConstraintType, IndexBuilder, TableBuilder} from '../schema/TableBuilder'
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import {collect, Collectable, Collection, ErrorWithContext, hasOwnProperty, Maybe} from '../../util'
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/**
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* An implementation of the SQLDialect specific to PostgreSQL.
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* @todo joins
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* @todo sub-selects
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*/
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export class PostgreSQLDialect extends SQLDialect {
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public escape(value: EscapeValue): QuerySafeValue {
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if ( value instanceof QuerySafeValue ) {
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return value
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} else if ( Array.isArray(value) || value instanceof Collection ) {
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return new QuerySafeValue(value, `(${value.map(v => this.escape(v)).join(',')})`)
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} else if ( String(value).toLowerCase() === 'true' || value === true ) {
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return new QuerySafeValue(value, 'TRUE')
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} else if ( String(value).toLowerCase() === 'false' || value === false ) {
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return new QuerySafeValue(value, 'FALSE')
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} else if ( typeof value === 'number' ) {
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return new QuerySafeValue(value, `${value}`)
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} else if ( value instanceof Date ) {
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const pad = (val: number) => val < 10 ? `0${val}` : `${val}`
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const [y, m, d, h, i, s] = [
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`${value.getFullYear()}`,
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`${pad(value.getMonth() + 1)}`,
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`${pad(value.getDate())}`,
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`${pad(value.getHours())}`,
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`${pad(value.getMinutes())}`,
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`${pad(value.getSeconds())}`,
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]
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return new QuerySafeValue(value, `'${y}-${m}-${d} ${h}:${i}:${s}'`)
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} else if ( value === null || typeof value === 'undefined' ) {
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return new QuerySafeValue(value, 'NULL')
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} else if ( !isNaN(Number(value)) ) {
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return new QuerySafeValue(value, String(Number(value)))
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} else {
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const escaped = value.replace(/'/g, '\'\'') // .replace(/"/g, '\\"').replace(/`/g, '\\`')
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return new QuerySafeValue(value, `'${escaped}'`)
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}
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}
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public renderQuerySource(source: QuerySource): string {
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if ( source instanceof QuerySafeValue ) {
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return String(source)
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} else if ( typeof source === 'string' ) {
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return source.replace(/"/g, '""')
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.split('.')
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.map(x => '"' + x + '"')
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.join('.')
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}
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return `${this.renderQuerySource(source.table)} AS "${source.alias.replace(/"/g, '""')}"`
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}
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public renderCount(query: string): string {
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return [
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'SELECT COUNT(*) AS "extollo_render_count"',
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'FROM (',
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...query.split('\n').map(x => ` ${x}`),
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') AS extollo_target_query',
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].join('\n')
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}
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public renderRangedSelect(query: string, start: number, end: number): string {
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return [
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'SELECT *',
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'FROM (',
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...query.split('\n').map(x => ` ${x}`),
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') AS extollo_target_query',
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`OFFSET ${start} LIMIT ${start === end ? ((end - start) + 1) : (end - start)}`,
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].join('\n')
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}
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/** Render the fields from the builder class to PostgreSQL syntax. */
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protected renderFields(builder: AbstractBuilder<any>): string[] {
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return builder.appliedFields.map((field: SpecifiedField) => {
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let columnString: string
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if ( typeof field === 'string' ) {
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columnString = field.split('.').map(x => `"${x}"`)
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.join('.')
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} else if ( field instanceof QuerySafeValue ) {
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columnString = field.toString()
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} else if ( typeof field.field === 'string' ) {
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columnString = field.field.split('.').map(x => `"${x}"`)
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.join('.')
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} else {
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columnString = field.field.toString()
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}
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let aliasString = ''
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if ( typeof field !== 'string' && !(field instanceof QuerySafeValue) ) {
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aliasString = ` AS "${field.alias}"`
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}
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return `${columnString}${aliasString}`
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})
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}
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public renderSelect(builder: AbstractBuilder<any>): string {
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const rawSql = builder.appliedRawSql
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if ( rawSql ) {
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return rawSql
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}
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const indent = (item: string, level = 1) => Array(level + 1).fill('')
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.join(' ') + item
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const queryLines = [
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`SELECT${builder.appliedDistinction ? ' DISTINCT' : ''}`,
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]
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// Add fields
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// FIXME error if no fields
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const fields = this.renderFields(builder).map(x => indent(x))
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.join(',\n')
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queryLines.push(fields)
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// Add table source
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// FIXME error if no source
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const source = builder.querySource
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if ( source ) {
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queryLines.push('FROM ' + this.renderQuerySource(source))
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}
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// Add constraints
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const wheres = this.renderConstraints(builder.appliedConstraints)
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if ( wheres.trim() ) {
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queryLines.push('WHERE')
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queryLines.push(wheres)
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}
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// Add group by
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if ( builder.appliedGroupings?.length ) {
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const grouping = builder.appliedGroupings.map(group => {
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return indent(group.split('.').map(x => `"${x}"`)
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.join('.'))
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}).join(',\n')
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queryLines.push('GROUP BY')
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queryLines.push(grouping)
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}
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// Add order by
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if ( builder.appliedOrder?.length ) {
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const ordering = builder.appliedOrder.map(x => indent(`${x.field.split('.').map(y => '"' + y + '"')
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.join('.')} ${x.direction}`)).join(',\n')
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queryLines.push('ORDER BY')
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queryLines.push(ordering)
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}
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// Add limit/offset
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const pagination = builder.appliedPagination
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if ( pagination.take ) {
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queryLines.push(`LIMIT ${pagination.take}${pagination.skip ? ' OFFSET ' + pagination.skip : ''}`)
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} else if ( pagination.skip ) {
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queryLines.push(`OFFSET ${pagination.skip}`)
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}
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return queryLines.join('\n')
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}
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public renderBatchUpdate(builder: AbstractBuilder<any>, primaryKey: string, dataRows: Collectable<{[key: string]: EscapeValue}>): string {
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const rows = Collection.normalize(dataRows)
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const rawSql = builder.appliedRawSql
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if ( rawSql ) {
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return rawSql
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}
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const queryLines: string[] = []
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// Add table source
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let source = builder.querySource
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if ( !source ) {
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throw new ErrorWithContext('No table specified for update query')
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}
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source = (typeof source !== 'string' && !(source instanceof QuerySafeValue)) ? source : {
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table: source,
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alias: 'extollo_update_source',
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}
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const sourceAlias = source.alias
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const sourceTable = source.table
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queryLines.push('UPDATE ' + this.renderQuerySource(source))
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queryLines.push('SET')
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const updateFields = this.getAllFieldsFromUpdateRows(rows)
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const updateTuples = rows.map(row => {
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return updateFields.map(field => {
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if ( hasOwnProperty(row, field) ) {
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return this.escape(row[field])
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}
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// FIXME: This is fairly inefficient. Probably a better way with a FROM ... SELECT
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// return raw(`"${sourceAlias}"."${field}"`)
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return raw(`(SELECT "${field}" FROM ${sourceTable} WHERE "${primaryKey}" = ${this.escape(row[primaryKey])})`)
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})
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})
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queryLines.push(updateFields.map(field => ` "${field}" = "extollo_update_tuple"."${field}"`).join(',\n'))
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queryLines.push('FROM (VALUES')
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queryLines.push(
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updateTuples.map(tuple => ` (${tuple.implode(', ')})`).join(',\n'),
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)
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queryLines.push(`) as extollo_update_tuple(${updateFields.map(x => `"${x}"`).join(', ')})`)
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queryLines.push(`WHERE "extollo_update_tuple"."${primaryKey}" = "${sourceAlias}"."${primaryKey}" AND (`)
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queryLines.push(this.renderConstraints(builder.appliedConstraints, 2))
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queryLines.push(`)`)
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return queryLines.join('\n')
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}
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private getAllFieldsFromUpdateRows(rows: Collection<{[key: string]: EscapeValue}>): Collection<string> {
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return rows.reduce((fields: Collection<string>, row) => {
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Object.keys(row).forEach(key => {
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if ( !fields.includes(key) ) {
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fields.push(key)
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}
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})
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return fields
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}, collect<string>())
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}
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// TODO support FROM, RETURNING
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public renderUpdate(builder: AbstractBuilder<any>, data: {[key: string]: EscapeValue}): string {
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const rawSql = builder.appliedRawSql
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if ( rawSql ) {
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return rawSql
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}
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const queryLines: string[] = []
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// Add table source
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const source = builder.querySource
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if ( source ) {
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queryLines.push('UPDATE ' + this.renderQuerySource(source))
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}
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queryLines.push(this.renderUpdateSet(data))
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// Add constraints
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const wheres = this.renderConstraints(builder.appliedConstraints)
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if ( wheres.trim() ) {
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queryLines.push('WHERE')
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queryLines.push(wheres)
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}
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const fields = this.renderFields(builder).map(x => ` ${x}`)
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.join(',\n')
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if ( fields ) {
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queryLines.push('RETURNING')
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queryLines.push(fields)
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}
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return queryLines.join('\n')
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}
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public renderExistential(builder: AbstractBuilder<any>): string {
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const rawSql = builder.appliedRawSql
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if ( rawSql ) {
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return `
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SELECT EXISTS(
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${rawSql}
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)
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`
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}
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const query = builder.clone()
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.clearFields()
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.field(raw('TRUE'))
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.limit(1)
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return this.renderSelect(query)
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}
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// FIXME: subquery support here and with select
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public renderInsert(builder: AbstractBuilder<any>, data: {[key: string]: EscapeValue}|{[key: string]: EscapeValue}[] = []): string {
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const rawSql = builder.appliedRawSql
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if ( rawSql ) {
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return rawSql
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}
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const indent = (item: string, level = 1) => Array(level + 1).fill('')
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.join(' ') + item
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const queryLines: string[] = []
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if ( !Array.isArray(data) ) {
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data = [data]
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}
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if ( data.length < 1 ) {
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return ''
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}
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const columns = Object.keys(data[0])
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// Add table source
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const source = builder.querySource
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if ( source ) {
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queryLines.push('INSERT INTO ' + this.renderQuerySource(source)
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+ (columns.length ? ` (${columns.map(x => `"${x}"`).join(', ')})` : ''))
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}
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if ( Array.isArray(data) && !data.length ) {
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queryLines.push('DEFAULT VALUES')
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} else {
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queryLines.push('VALUES')
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const valueString = data.map(row => {
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const values = columns.map(x => this.escape(row[x]))
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return indent(`(${values.join(', ')})`)
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})
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.join(',\n')
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queryLines.push(valueString)
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}
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// Add return fields
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if ( builder.appliedFields?.length ) {
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queryLines.push('RETURNING')
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const fields = this.renderFields(builder).map(x => indent(x))
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.join(',\n')
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queryLines.push(fields)
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}
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return queryLines.join('\n')
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}
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public renderDelete(builder: AbstractBuilder<any>): string {
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const rawSql = builder.appliedRawSql
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if ( rawSql ) {
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return rawSql
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}
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const indent = (item: string, level = 1) => Array(level + 1).fill('')
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.join(' ') + item
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const queryLines: string[] = []
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// Add table source
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const source = builder.querySource
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if ( source ) {
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queryLines.push('DELETE FROM ' + this.renderQuerySource(source))
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}
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// Add constraints
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const wheres = this.renderConstraints(builder.appliedConstraints)
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if ( wheres.trim() ) {
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queryLines.push('WHERE')
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queryLines.push(wheres)
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}
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// Add return fields
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if ( builder.appliedFields?.length ) {
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queryLines.push('RETURNING')
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const fields = this.renderFields(builder).map(x => indent(x))
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.join(',\n')
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queryLines.push(fields)
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}
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return queryLines.join('\n')
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}
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public renderConstraints(allConstraints: Constraint[], startingLevel = 1): string {
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const constraintsToSql = (constraints: Constraint[], level = startingLevel): string => {
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const indent = Array(level * 2).fill(' ')
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.join('')
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const statements = []
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for ( const constraint of constraints ) {
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if ( isConstraintGroup(constraint) ) {
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statements.push(`${indent}${statements.length < 1 ? '' : constraint.preop + ' '}(\n${constraintsToSql(constraint.items, level + 1)}\n${indent})`)
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} else if ( isConstraintItem(constraint) ) {
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if ( Array.isArray(constraint.operand) && !constraint.operand.length ) {
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statements.push(`${indent}1 = 0 -- ${constraint.field} ${constraint.operator} empty set`)
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continue
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}
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const field: string = constraint.field.split('.').map(x => `"${x}"`)
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.join('.')
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statements.push(`${indent}${statements.length < 1 ? '' : constraint.preop + ' '}${field} ${constraint.operator} ${this.escape(constraint.operand).value}`)
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} else if ( constraint instanceof QuerySafeValue ) {
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statements.push(`${indent}${statements.length < 1 ? '' : 'AND '}${constraint.toString()}`)
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}
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}
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return statements.filter(Boolean).join('\n')
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}
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return constraintsToSql(allConstraints)
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}
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public renderUpdateSet(data: {[key: string]: EscapeValue}): string {
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const sets = []
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for ( const key in data ) {
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if ( !Object.prototype.hasOwnProperty.call(data, key) ) {
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continue
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}
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sets.push(` "${key}" = ${this.escape(data[key])}`)
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}
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return `SET\n${sets.join(',\n')}`
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}
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public renderCreateTable(builder: TableBuilder): string {
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const cols = this.renderTableColumns(builder).map(x => ` ${x}`)
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const builderConstraints = builder.getConstraints()
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const constraints: string[] = []
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for ( const constraintName in builderConstraints ) {
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if ( !Object.prototype.hasOwnProperty.call(builderConstraints, constraintName) ) {
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continue
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}
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const constraintBuilder = builderConstraints[constraintName]
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const constraintDefinition = this.renderConstraintDefinition(constraintBuilder)
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if ( constraintDefinition ) {
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constraints.push(` CONSTRAINT ${constraintDefinition}`)
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}
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}
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const parts = [
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`CREATE TABLE ${builder.isSkippedIfExisting() ? 'IF NOT EXISTS ' : ''}${builder.name} (`,
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[
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...cols,
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...constraints,
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].join(',\n'),
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`)`,
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]
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return parts.join('\n')
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}
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public renderTableColumns(builder: TableBuilder): string[] {
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const defined = builder.getColumns()
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const rendered: string[] = []
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for ( const columnName in defined ) {
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if ( !Object.prototype.hasOwnProperty.call(defined, columnName) ) {
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continue
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}
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const columnBuilder = defined[columnName]
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rendered.push(this.renderColumnDefinition(columnBuilder))
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}
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return rendered
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}
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/**
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* Given a constraint schema-builder, render the constraint definition.
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* @param builder
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* @protected
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*/
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protected renderConstraintDefinition(builder: ConstraintBuilder): Maybe<string> {
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const constraintType = builder.getType()
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if ( constraintType === ConstraintType.Unique ) {
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const fields = builder.getFields()
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.map(x => `"${x}"`)
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.join(',')
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return `${builder.name} UNIQUE(${fields})`
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} else if ( constraintType === ConstraintType.Check ) {
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const expression = builder.getExpression()
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if ( !expression ) {
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throw new ErrorWithContext('Cannot create check constraint without expression.', {
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constraintName: builder.name,
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tableName: builder.parent.name,
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})
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}
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return `${builder.name} CHECK(${expression})`
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}
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}
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/**
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* Given a column-builder, render the SQL-definition as used in
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* CREATE TABLE and ALTER TABLE statements.
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* @fixme Type `serial` only exists on CREATE TABLE... queries
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* @param builder
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* @protected
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*/
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protected renderColumnDefinition(builder: ColumnBuilder): string {
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const type = builder.getType()
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if ( !type ) {
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throw new ErrorWithContext(`Missing field type for column: ${builder.name}`, {
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columnName: builder.name,
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columnType: type,
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})
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}
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let render = `"${builder.name}" ${inverseFieldType(type)}`
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if ( builder.getLength() ) {
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render += `(${builder.getLength()})`
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}
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const defaultValue = builder.getDefaultValue()
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if ( typeof defaultValue !== 'undefined' ) {
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render += ` DEFAULT ${this.escape(defaultValue)}`
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}
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if ( builder.isPrimary() ) {
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render += ` CONSTRAINT ${builder.name}_pk PRIMARY KEY`
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}
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if ( builder.isUnique() ) {
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render += ` UNIQUE`
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}
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render += ` ${builder.isNullable() ? 'NULL' : 'NOT NULL'}`
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return render
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}
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public renderDropTable(builder: TableBuilder): string {
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return `DROP TABLE ${builder.isSkippedIfExisting() ? 'IF EXISTS ' : ''}${builder.name}`
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}
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|
|
public renderCreateIndex(builder: IndexBuilder): string {
|
|
const cols = builder.getFields().map(x => `"${x}"`)
|
|
const parts = [
|
|
`CREATE ${builder.isUnique() ? 'UNIQUE ' : ''}INDEX ${builder.isSkippedIfExisting() ? 'IF NOT EXISTS ' : ''}${builder.name}`,
|
|
` ON ${builder.parent.name}`,
|
|
` (${cols.join(',')})`,
|
|
]
|
|
|
|
return parts.join('\n')
|
|
}
|
|
|
|
public renderAlterTable(builder: TableBuilder): Maybe<string> {
|
|
const alters: string[] = []
|
|
const columns = builder.getColumns()
|
|
|
|
for ( const columnName in columns ) {
|
|
if ( !Object.prototype.hasOwnProperty.call(columns, columnName) ) {
|
|
continue
|
|
}
|
|
|
|
const columnBuilder = columns[columnName]
|
|
if ( !columnBuilder.isExisting() ) {
|
|
// The column doesn't exist on the table, but was added to the schema
|
|
alters.push(` ADD COLUMN ${this.renderColumnDefinition(columnBuilder)}`)
|
|
} else if ( columnBuilder.isDirty() && columnBuilder.originalFromSchema ) {
|
|
// The column exists in the table, but was modified in the schema
|
|
if ( columnBuilder.isDropping() || columnBuilder.isDroppingIfExists() ) {
|
|
alters.push(` DROP COLUMN "${columnBuilder.name}"`)
|
|
continue
|
|
}
|
|
|
|
// Change the data type of the column
|
|
if ( columnBuilder.getType() !== columnBuilder.originalFromSchema.getType() ) {
|
|
const renderedType = `${columnBuilder.getType()}${columnBuilder.getLength() ? `(${columnBuilder.getLength()})` : ''}`
|
|
alters.push(` ALTER COLUMN "${columnBuilder.name}" TYPE ${renderedType}`)
|
|
}
|
|
|
|
// Change the default value of the column
|
|
if ( columnBuilder.getDefaultValue() !== columnBuilder.originalFromSchema.getDefaultValue() ) {
|
|
alters.push(` ALTER COLUMN "${columnBuilder.name}" SET default ${this.escape(columnBuilder.getDefaultValue())}`)
|
|
}
|
|
|
|
// Change the nullable-status of the column
|
|
if ( columnBuilder.isNullable() !== columnBuilder.originalFromSchema.isNullable() ) {
|
|
if ( columnBuilder.isNullable() ) {
|
|
alters.push(` ALTER COLUMN "${columnBuilder.name}" DROP NOT NULL`)
|
|
} else {
|
|
alters.push(` ALTER COLUMN "${columnBuilder.name}" SET NOT NULL`)
|
|
}
|
|
}
|
|
|
|
// Change the name of the column
|
|
if ( columnBuilder.getRename() ) {
|
|
alters.push(` RENAME COLUMN "${columnBuilder.name}" TO "${columnBuilder.getRename()}"`)
|
|
}
|
|
}
|
|
}
|
|
|
|
const constraints = builder.getConstraints()
|
|
for ( const constraintName in constraints ) {
|
|
if ( !Object.prototype.hasOwnProperty.call(constraints, constraintName) ) {
|
|
continue
|
|
}
|
|
|
|
const constraintBuilder = constraints[constraintName]
|
|
|
|
// Drop the constraint if specified
|
|
if ( constraintBuilder.isDropping() ) {
|
|
alters.push(` DROP CONSTRAINT ${constraintBuilder.name}`)
|
|
continue
|
|
}
|
|
|
|
// Drop the constraint with IF EXISTS if specified
|
|
if ( constraintBuilder.isDroppingIfExists() ) {
|
|
alters.push(` DROP CONSTRAINT IF EXISTS ${constraintBuilder.name}`)
|
|
continue
|
|
}
|
|
|
|
// Otherwise, drop and recreate the constraint if it was modified
|
|
if ( constraintBuilder.isDirty() ) {
|
|
if ( constraintBuilder.isExisting() ) {
|
|
alters.push(` DROP CONSTRAINT IF EXISTS ${constraintBuilder.name}`)
|
|
}
|
|
|
|
const constraintDefinition = this.renderConstraintDefinition(constraintBuilder)
|
|
if ( constraintDefinition ) {
|
|
alters.push(` ADD CONSTRAINT ${constraintDefinition}`)
|
|
}
|
|
}
|
|
}
|
|
|
|
if ( builder.getRename() ) {
|
|
alters.push(` RENAME TO "${builder.getRename()}"`)
|
|
}
|
|
|
|
if ( !alters.length ) {
|
|
return undefined
|
|
}
|
|
|
|
return 'ALTER TABLE ' + builder.name + '\n' + alters.join(',\n')
|
|
}
|
|
|
|
public renderDropIndex(builder: IndexBuilder): string {
|
|
return `DROP INDEX ${builder.isDroppingIfExists() ? 'IF EXISTS ' : ''}${builder.name}`
|
|
}
|
|
|
|
public renderTransaction(queries: string[]): string {
|
|
const parts = [
|
|
'BEGIN',
|
|
...queries,
|
|
'COMMIT',
|
|
]
|
|
|
|
return parts.join(';\n\n')
|
|
}
|
|
|
|
public renderRenameIndex(builder: IndexBuilder): string {
|
|
return `ALTER INDEX ${builder.name} RENAME TO ${builder.getRename()}`
|
|
}
|
|
|
|
public renderRecreateIndex(builder: IndexBuilder): string {
|
|
return `${this.renderDropIndex(builder)};\n\n${this.renderCreateIndex(builder)}`
|
|
}
|
|
|
|
public renderDropColumn(builder: ColumnBuilder): string {
|
|
const parts = [
|
|
`ALTER TABLE ${builder.parent.name} ${builder.parent.isSkippedIfExisting() ? 'IF EXISTS ' : ''}`,
|
|
` DROP COLUMN ${builder.isSkippedIfExisting() ? 'IF EXISTS ' : ''}${builder.name}`,
|
|
]
|
|
|
|
return parts.join('\n')
|
|
}
|
|
|
|
public currentTimestamp(): QuerySafeValue {
|
|
return raw('NOW()')
|
|
}
|
|
}
|