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* @author David Menger
*/
'use strict';
const loadMigrationsIntoSet = require('migrate/lib/load-migrations');
const migrate = require('migrate');
const mssql = require('mssql');
const { format } = require('sqlstring');
const MigrationSet = require('./MigrationSet');
class Migrate {
/**
*
* @param {Promise<mssql.ConnectionPool>} pool
* @param {string} migrationsPath
* @param {string} tableName
*/
constructor (pool, migrationsPath, tableName = 'migrations') {
this._pool = pool;
this._tableName = tableName;
this._migrationsPath = migrationsPath;
}
load (cb) {
this._load()
.then((set) => cb(null, set))
.catch((e) => cb(e));
}
async _load () {
const cp = await this._pool;
try {
const r = cp.request();
const res = await r.query(`SELECT TOP 1 data FROM ${this._tableName} WHERE id=1`);
const [item = null] = res.recordset;
Iif (!item) {
return { lastRun: null, migrations: [] };
}
return JSON.parse(item.data);
} catch (e) {
const r = cp.request();
await r.query(`CREATE TABLE ${this._tableName} (id int, data text)`);
return { lastRun: null, migrations: [] };
}
}
save (set, cb) {
this._save(set)
.then(() => cb())
.catch((e) => cb(e));
}
async _save (set) {
const cp = await this._pool;
const r = cp.request();
await r
.input('data', mssql.Text, JSON.stringify(set))
.query(`MERGE INTO ${this._tableName} AS target
USING (SELECT 1 as id) AS source (id)
ON source.id = target.id
WHEN MATCHED THEN
UPDATE SET data = @data
WHEN NOT MATCHED THEN
INSERT (id, data) VALUES (1, @data);`);
}
migrate () {
const query = async (string, ...args) => {
const q = await this._pool;
const r = q.request();
return r.query(format(string, args));
};
const set = new MigrationSet(this, query);
// @ts-ignore
migrate.set = set;
return new Promise((resolve, reject) => {
loadMigrationsIntoSet({
set,
store: this,
ignoreMissing: true,
migrationsDirectory: this._migrationsPath
}, (err) => {
Iif (err) {
reject(err);
} else {
// @ts-ignore
set.up((er) => {
Iif (er) {
reject(er);
} else {
resolve();
}
});
}
});
});
}
}
module.exports = Migrate;
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