engines moved to separate library

lib/engines/mysql/MySqlAnalyser.js

@@ -0,0 +1,53 @@
+const fs = require('fs-extra');
+const fp = require('lodash/fp');
+const path = require('path');
+const _ = require('lodash');
+
+const DatabaseAnalayser = require('../default/DatabaseAnalyser');
+
+/** @returns {Promise<string>} */
+async function loadQuery(name) {
+  return await fs.readFile(path.join(__dirname, name), 'utf-8');
+}
+
+class MySqlAnalyser extends DatabaseAnalayser {
+  constructor(pool, driver) {
+    super(pool, driver);
+  }
+
+  async createQuery(
+    resFileName,
+    tables = false,
+    views = false,
+    procedures = false,
+    functions = false,
+    triggers = false
+  ) {
+    let res = await loadQuery(resFileName);
+    res = res.replace('=[OBJECT_NAME_CONDITION]', ' is not null');
+    res = res.replace('#DATABASE#', this.pool._database_name);
+    return res;
+  }
+  async runAnalysis() {
+    const tables = await this.driver.query(this.pool, await this.createQuery('tables.sql'));
+    const columns = await this.driver.query(this.pool, await this.createQuery('columns.sql'));
+    //   const pkColumns = await this.driver.query(this.pool, await this.createQuery('primary_keys.sql'));
+    //   const fkColumns = await this.driver.query(this.pool, await this.createQuery('foreign_keys.sql'));
+
+    this.result.tables = tables.rows.map(table => ({
+      ...table,
+      columns: columns.rows
+        .filter(col => col.pureName == table.pureName)
+        .map(({ isNullable, extra, ...col }) => ({
+          ...col,
+          notNull: !isNullable,
+          autoIncrement: extra && extra.toLowerCase().includes('auto_increment'),
+        })),
+      foreignKeys: [],
+      // primaryKey: extractPrimaryKeys(table, pkColumns.rows),
+      // foreignKeys: extractForeignKeys(table, fkColumns.rows),
+    }));
+  }
+}
+
+module.exports = MySqlAnalyser;