148 lines
6.6 KiB
JavaScript
148 lines
6.6 KiB
JavaScript
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/*
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* This file is a part of "NMIG" - the database migration tool.
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*
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* Copyright 2016 Anatoly Khaytovich <anatolyuss@gmail.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (please see the "LICENSE.md" file).
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* If not, see <http://www.gnu.org/licenses/gpl.txt>.
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*
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* @author Anatoly Khaytovich <anatolyuss@gmail.com>
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*/
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'use strict';
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const connect = require('./Connector');
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const log = require('./Logger');
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const generateError = require('./ErrorGenerator');
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/**
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* Converts MySQL data types to corresponding PostgreSQL data types.
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* This conversion performs in accordance to mapping rules in './DataTypesMap.json'.
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* './DataTypesMap.json' can be customized.
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*
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* @param {Object} objDataTypesMap
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* @param {String} mySqlDataType
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* @returns {String}
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*/
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function mapDataTypes(objDataTypesMap, mySqlDataType) {
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let retVal = '';
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let arrDataTypeDetails = mySqlDataType.split(' ');
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mySqlDataType = arrDataTypeDetails[0].toLowerCase();
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let increaseOriginalSize = arrDataTypeDetails.indexOf('unsigned') !== -1 || arrDataTypeDetails.indexOf('zerofill') !== -1;
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arrDataTypeDetails = null;
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if (mySqlDataType.indexOf('(') === -1) {
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// No parentheses detected.
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retVal = increaseOriginalSize ? objDataTypesMap[mySqlDataType].increased_size : objDataTypesMap[mySqlDataType].type;
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} else {
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// Parentheses detected.
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let arrDataType = mySqlDataType.split('(');
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let strDataType = arrDataType[0].toLowerCase();
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let strDataTypeDisplayWidth = arrDataType[1];
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arrDataType = null;
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if ('enum' === strDataType || 'set' === strDataType) {
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retVal = 'character varying(255)';
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} else if ('decimal' === strDataType || 'numeric' === strDataType) {
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retVal = objDataTypesMap[strDataType].type + '(' + strDataTypeDisplayWidth;
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} else if ('decimal(19,2)' === mySqlDataType || objDataTypesMap[strDataType].mySqlVarLenPgSqlFixedLen) {
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// Should be converted without a length definition.
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retVal = increaseOriginalSize
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? objDataTypesMap[strDataType].increased_size
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: objDataTypesMap[strDataType].type;
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} else {
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// Should be converted with a length definition.
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retVal = increaseOriginalSize
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? objDataTypesMap[strDataType].increased_size + '(' + strDataTypeDisplayWidth
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: objDataTypesMap[strDataType].type + '(' + strDataTypeDisplayWidth;
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}
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}
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// Prevent incompatible length (CHARACTER(0) or CHARACTER VARYING(0)).
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if (retVal === 'character(0)') {
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retVal = 'character(1)';
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} else if (retVal === 'character varying(0)') {
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retVal = 'character varying(1)';
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}
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return retVal;
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}
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/**
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* Migrates structure of a single table to PostgreSql server.
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*
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* @param {Conversion} self
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* @param {String} tableName
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* @returns {Promise}
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*/
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module.exports = function(self, tableName) {
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return connect(self).then(() => {
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return new Promise((resolveCreateTable, rejectCreateTable) => {
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log(self, '\t--[createTable] Currently creating table: `' + tableName + '`', self._dicTables[tableName].tableLogPath);
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self._mysql.getConnection((error, connection) => {
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if (error) {
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// The connection is undefined.
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generateError(self, '\t--[createTable] Cannot connect to MySQL server...\n' + error);
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rejectCreateTable();
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} else {
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let sql = 'SHOW FULL COLUMNS FROM `' + tableName + '`;';
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connection.query(sql, (err, rows) => {
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connection.release();
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if (err) {
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generateError(self, '\t--[createTable] ' + err, sql);
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rejectCreateTable();
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} else {
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self._dicTables[tableName].arrTableColumns = rows;
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if (self._migrateOnlyData) {
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return resolveCreateTable();
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}
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self._pg.connect((error, client, done) => {
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if (error) {
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generateError(self, '\t--[createTable] Cannot connect to PostgreSQL server...\n' + error, sql);
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rejectCreateTable();
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} else {
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sql = 'CREATE TABLE IF NOT EXISTS "' + self._schema + '"."' + tableName + '"(';
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for (let i = 0; i < rows.length; ++i) {
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let strConvertedType = mapDataTypes(self._dataTypesMap, rows[i].Type);
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sql += '"' + rows[i].Field + '" ' + strConvertedType + ',';
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}
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rows = null;
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sql = sql.slice(0, -1) + ');';
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client.query(sql, err => {
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done();
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if (err) {
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generateError(self, '\t--[createTable] ' + err, sql);
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rejectCreateTable();
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} else {
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log(self,
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'\t--[createTable] Table "' + self._schema + '"."' + tableName + '" is created...',
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self._dicTables[tableName].tableLogPath
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);
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resolveCreateTable();
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}
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});
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}
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});
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}
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});
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}
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});
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});
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});
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};
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