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books/backends/sqlite.js
2018-02-06 22:45:17 +05:30

361 lines
11 KiB
JavaScript

const frappe = require('frappejs');
const sqlite3 = require('sqlite3').verbose();
const debug = true;
class sqliteDatabase {
constructor({ db_path }) {
this.db_path = db_path;
this.init_type_map();
}
connect(db_path) {
if (db_path) {
this.db_path = db_path;
}
return new Promise(resolve => {
this.conn = new sqlite3.Database(this.db_path, () => {
if (debug) {
this.conn.on('trace', (trace) => console.log(trace));
}
resolve();
});
});
}
async migrate() {
for (let doctype in frappe.modules) {
// check if controller module
if (frappe.modules[doctype].Meta) {
if (await this.table_exists(doctype)) {
await this.alter_table(doctype);
} else {
await this.create_table(doctype);
}
}
}
await this.commit();
}
async create_table(doctype) {
let meta = frappe.get_meta(doctype);
let columns = [];
let values = [];
for (let df of meta.get_valid_fields({ with_children: false })) {
if (this.type_map[df.fieldtype]) {
columns.push(this.get_column_definition(df));
}
}
const query = `CREATE TABLE IF NOT EXISTS ${frappe.slug(doctype)} (
${columns.join(", ")})`;
return await this.run(query, values);
}
close() {
this.conn.close();
}
get_column_definition(df) {
return `${df.fieldname} ${this.type_map[df.fieldtype]} ${df.reqd && !df.default ? "not null" : ""} ${df.default ? `default ${df.default}` : ""}`
}
async alter_table(doctype) {
// get columns
let table_columns = (await this.sql(`PRAGMA table_info(${doctype})`)).map(d => d.name);
let meta = frappe.get_meta(doctype);
let values = [];
for (let df of meta.get_valid_fields({ with_children: false })) {
if (!table_columns.includes(df.fieldname) && this.type_map[df.fieldtype]) {
values = []
if (df.default) {
values.push(df.default);
}
await this.run(`ALTER TABLE ${frappe.slug(doctype)} ADD COLUMN ${this.get_column_definition(df)}`, values);
}
}
}
async get(doctype, name, fields = '*') {
// load parent
let doc = await this.get_one(doctype, name, fields);
// load children
let table_fields = frappe.get_meta(doctype).get_table_fields();
for (let field of table_fields) {
doc[field.fieldname] = await this.get_all({
doctype: field.childtype,
fields: ["*"],
filters: { parent: doc.name },
order_by: 'idx',
order: 'asc'
});
}
return doc;
}
get_one(doctype, name, fields = '*') {
if (fields instanceof Array) {
fields = fields.join(", ");
}
return new Promise((resolve, reject) => {
this.conn.get(`select ${fields} from ${frappe.slug(doctype)}
where name = ?`, name,
(err, row) => {
resolve(row || {});
});
});
}
async insert(doctype, doc) {
// insert parent
await this.insert_one(doctype, doc);
// insert children
let table_fields = frappe.get_meta(doctype).get_table_fields();
for (let field of table_fields) {
let idx = 0;
for (let child of (doc[field.fieldname] || [])) {
this.prepare_child(doctype, doc.name, child, field, idx);
await this.insert_one(field.childtype, child);
idx++;
}
}
return doc;
}
async insert_one(doctype, doc) {
let fields = this.get_keys(doctype);
let placeholders = fields.map(d => '?').join(', ');
if (!doc.name) {
doc.name = frappe.get_random_name();
}
return await this.run(`insert into ${frappe.slug(doctype)}
(${fields.map(field => field.fieldname).join(", ")})
values (${placeholders})`, this.get_formatted_values(fields, doc));
}
async update(doctype, doc) {
// update parent
await this.update_one(doctype, doc);
// insert or update children
let table_fields = frappe.get_meta(doctype).get_table_fields();
for (let field of table_fields) {
// first key is "parent" - for SQL params
let added_children = [doc.name];
for (let child of (doc[field.fieldname] || [])) {
this.prepare_child(doctype, doc.name, child, field, added_children.length - 1);
if (await this.exists(field.childtype, child.name)) {
await this.update_one(field.childtype, child);
} else {
await this.insert_one(field.childtype, child);
}
added_children.push(child.name);
}
// delete other children
// `delete from doctype where parent = ? and name not in (?, ?, ?)}`
await this.run(`delete from ${frappe.slug(field.childtype)}
where
parent = ? and
name not in (${added_children.map(d => '?').join(', ')})`, added_children);
}
return doc;
}
async update_one(doctype, doc) {
let fields = this.get_keys(doctype);
let assigns = fields.map(field => `${field.fieldname} = ?`);
let values = this.get_formatted_values(fields, doc);
// additional name for where clause
values.push(doc.name);
return await this.run(`update ${frappe.slug(doctype)}
set ${assigns.join(", ")} where name=?`, values);
}
prepare_child(parenttype, parent, child, field, idx) {
child.parent = parent;
child.parenttype = parenttype;
child.parentfield = field.fieldname;
child.idx = idx;
}
get_keys(doctype) {
return frappe.get_meta(doctype).get_valid_fields({ with_children: false });
}
get_formatted_values(fields, doc) {
let values = fields.map(field => {
let value = doc[field.fieldname];
if (value instanceof Date) {
return value.toISOString();
} else {
return value;
}
});
return values;
}
async delete(doctype, name) {
await this.run(`delete from ${frappe.slug(doctype)} where name=?`, name);
// delete children
let table_fields = frappe.get_meta(doctype).get_table_fields();
for (let field of table_fields) {
await this.run(`delete from ${frappe.slug(field.childtype)} where parent=?`, name)
}
}
async exists(doctype, name) {
return (await this.get_value(doctype, name)) ? true : false;
}
async get_value(doctype, filters, fieldname = 'name') {
if (typeof filters === 'string') {
filters = { name: filters };
}
let row = await this.get_all({
doctype: doctype,
fields: [fieldname],
filters: filters,
start: 0,
limit: 1,
order_by: 'name',
order: 'asc'
});
return row.length ? row[0][fieldname] : null;
}
get_all({ doctype, fields, filters, start, limit, order_by = 'modified', order = 'desc' } = {}) {
if (!fields) {
fields = frappe.get_meta(doctype).get_keyword_fields();
}
return new Promise((resolve, reject) => {
let conditions = this.get_filter_conditions(filters);
this.conn.all(`select ${fields.join(", ")}
from ${frappe.slug(doctype)}
${conditions.conditions ? "where" : ""} ${conditions.conditions}
${order_by ? ("order by " + order_by) : ""} ${order_by ? (order || "asc") : ""}
${limit ? ("limit " + limit) : ""} ${start ? ("offset " + start) : ""}`, conditions.values,
(err, rows) => {
if (err) {
reject(err);
} else {
resolve(rows);
}
});
});
}
get_filter_conditions(filters) {
// {"status": "Open"} => `status = "Open"`
// {"status": "Open", "name": ["like", "apple%"]}
// => `status="Open" and name like "apple%"
let conditions = [];
let values = [];
for (let key in filters) {
const value = filters[key];
if (value instanceof Array) {
// if its like, we should add the wildcard "%" if the user has not added
if (value[0].toLowerCase() === 'like' && !value[1].includes('%')) {
value[1] = `%${value[1]}%`;
}
conditions.push(`${key} ${value[0]} ?`);
values.push(value[1]);
} else {
conditions.push(`${key} = ?`);
values.push(value);
}
}
return {
conditions: conditions.length ? conditions.join(" and ") : "",
values: values
};
}
run(query, params) {
// TODO promisify
return new Promise((resolve, reject) => {
this.conn.run(query, params, (err) => {
if (err) {
if (debug) {
console.error(err);
}
reject(err);
} else {
resolve();
}
});
});
}
sql(query, params) {
return new Promise((resolve) => {
this.conn.all(query, params, (err, rows) => {
resolve(rows);
});
});
}
async commit() {
try {
await this.run('commit');
} catch (e) {
if (e.errno !== 1) {
throw e;
}
}
}
async table_exists(table) {
const name = await this.sql(`SELECT name FROM sqlite_master WHERE type='table' AND name='${table}'`);
return (name && name.length) ? true : false;
}
init_type_map() {
this.type_map = {
'Currency': 'real'
, 'Int': 'integer'
, 'Float': 'real'
, 'Percent': 'real'
, 'Check': 'integer'
, 'Small Text': 'text'
, 'Long Text': 'text'
, 'Code': 'text'
, 'Text Editor': 'text'
, 'Date': 'text'
, 'Datetime': 'text'
, 'Time': 'text'
, 'Text': 'text'
, 'Data': 'text'
, 'Link': 'text'
, 'Dynamic Link': 'text'
, 'Password': 'text'
, 'Select': 'text'
, 'Read Only': 'text'
, 'Attach': 'text'
, 'Attach Image': 'text'
, 'Signature': 'text'
, 'Color': 'text'
, 'Barcode': 'text'
, 'Geolocation': 'text'
}
}
}
module.exports = { Database: sqliteDatabase };