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271 lines
10 KiB
271 lines
10 KiB
import {EscapeValue, QuerySafeValue, raw, SQLDialect} from './SQLDialect';
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import {Constraint, isConstraintGroup, isConstraintItem, SpecifiedField} from "../types";
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import {AbstractBuilder} from "../builder/AbstractBuilder";
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/**
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* An implementation of the SQLDialect specific to PostgreSQL.
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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 ) return value
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else if ( Array.isArray(value) ) {
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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}:${s}`)
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} else if ( !isNaN(Number(value)) ) {
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return new QuerySafeValue(value, String(Number(value)))
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} else if ( value === null || typeof value === 'undefined' ) {
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return new QuerySafeValue(value, 'NULL')
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} else {
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const escaped = value.replace(/'/g, '\\\'') //.replace(/"/g, '\\"').replace(/`/g, '\\`')
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return new QuerySafeValue(value, `'${escaped}'`)
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}
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}
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public 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 ${(end - start) + 1}`
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].join('\n')
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}
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/** Render the fields from the builder class to PostgreSQL syntax. */
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protected renderFields(builder: AbstractBuilder<any>) {
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return builder.appliedFields.map((field: SpecifiedField) => {
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let columnString: string
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if ( typeof field === 'string' ) columnString = field.split('.').map(x => `"${x}"`).join('.')
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else if ( field instanceof QuerySafeValue ) columnString = field.toString()
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else if ( typeof field.field === 'string' ) columnString = field.field.split('.').map(x => `"${x}"`).join('.')
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else columnString = field.field.toString()
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let aliasString = ''
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if ( typeof field !== 'string' && !(field instanceof QuerySafeValue) ) aliasString = ` AS "${field.alias}"`
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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 indent = (item: string, level = 1) => Array(level + 1).fill('').join(' ') + item
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const queryLines = [
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`SELECT${builder.appliedDistinction ? ' DISTINCT' : ''}`
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]
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// Add fields
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// FIXME error if no fields
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const fields = this.renderFields(builder).map(x => indent(x)).join(',\n')
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queryLines.push(fields)
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// Add table source
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// FIXME error if no source
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const source = builder.querySource
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if ( source ) {
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const tableString = typeof source === 'string' ? source : source.table
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const table: string = tableString.split('.').map(x => `"${x}"`).join('.')
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queryLines.push('FROM ' + (typeof source === 'string' ? table : `${table} "${source.alias}"`))
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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 => `"${x}"`).join('.'))
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}).join(',\n')
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queryLines.push('GROUP BY')
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queryLines.push(grouping)
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}
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// Add order by
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if ( builder.appliedOrder?.length ) {
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const ordering = builder.appliedOrder.map(x => indent(`${x.field.split('.').map(x => '"' + x + '"').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 ${pagination.skip}`)
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}
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return queryLines.join('\n')
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}
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// TODO support FROM, RETURNING
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public renderUpdate(builder: AbstractBuilder<any>, data: {[key: string]: EscapeValue}): string {
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const indent = (item: string, level = 1) => Array(level + 1).fill('').join(' ') + item
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const queryLines: string[] = []
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// Add table source
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const source = builder.querySource
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if ( source ) {
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const tableString = typeof source === 'string' ? source : source.table
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const table: string = tableString.split('.').map(x => `"${x}"`).join('.')
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queryLines.push('UPDATE ' + (typeof source === 'string' ? table : `${table} "${source.alias}"`))
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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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return queryLines.join('\n')
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}
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public renderExistential(builder: AbstractBuilder<any>): string {
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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 indent = (item: string, level = 1) => Array(level + 1).fill('').join(' ') + item
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const queryLines: string[] = []
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if ( !Array.isArray(data) ) data = [data]
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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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const tableString = typeof source === 'string' ? source : source.table
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const table: string = tableString.split('.').map(x => `"${x}"`).join('.')
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queryLines.push('INSERT INTO ' + (typeof source === 'string' ? table : `${table} AS "${source.alias}"`)
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+ (columns.length ? ` (${columns.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(`(${values.join(', ')})`)
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})
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.join(',\n')
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queryLines.push(valueString)
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}
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// Add return fields
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if ( builder.appliedFields?.length ) {
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queryLines.push('RETURNING')
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const fields = this.renderFields(builder).map(x => indent(x)).join(',\n')
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queryLines.push(fields)
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}
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return queryLines.join('\n')
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}
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public renderDelete(builder: AbstractBuilder<any>): string {
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const indent = (item: string, level = 1) => Array(level + 1).fill('').join(' ') + item
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const queryLines: string[] = []
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// Add table source
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const source = builder.querySource
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if ( source ) {
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const tableString = typeof source === 'string' ? source : source.table
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const table: string = tableString.split('.').map(x => `"${x}"`).join('.')
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queryLines.push('DELETE FROM ' + (typeof source === 'string' ? table : `${table} "${source.alias}"`))
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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)).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(constraints: Constraint[]): string {
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const constraintsToSql = (constraints: Constraint[], level = 1): string => {
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const indent = Array(level * 2).fill(' ').join('')
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let 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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const field: string = constraint.field.split('.').map(x => `"${x}"`).join('.')
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statements.push(`${indent}${statements.length < 1 ? '' : constraint.preop + ' '}${field} ${constraint.operator} ${this.escape(constraint.operand).value}`)
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}
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}
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return statements.filter(Boolean).join('\n')
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}
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return constraintsToSql(constraints)
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}
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public renderUpdateSet(data: {[key: string]: EscapeValue}) {
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const sets = []
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for ( const key in data ) {
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if ( !data.hasOwnProperty(key) ) continue
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sets.push(` "${key}" = ${this.escape(data[key])}`)
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}
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return ['SET', ...sets].join('\n')
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}
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}
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