MySQL向GraphQL遷移
作者:佚名
GraphQL 是一個開源的圖形數(shù)據(jù)庫(基于Node.js實現(xiàn)), sequelize-auto 將 MySQL 數(shù)據(jù)庫轉(zhuǎn)變成模型。
GraphQL 是一個開源的圖形數(shù)據(jù)庫(基于Node.js實現(xiàn)), 中文文檔: https://graphql.js.cool/
sequelize-auto 將 MySQL 數(shù)據(jù)庫轉(zhuǎn)變成模型
- [node] sequelize-auto -h <host> -d <database> -u <user> -x [password] -p [port] --dialect [dialect] -c [/path/to/config] -o [/path/to/models] -t [tableName] -C 參數(shù): -h, --host 主機地址 [必須] -d, --database 數(shù)據(jù)名 [必須] -u, --user 用戶名 -x, --pass 密碼 -p, --port 端口號 -c, --config 配置文件,參考: https://sequelize.readthedocs.org/en/latest/api/sequelize/ -o, --output 輸出目錄 -e, --dialect 數(shù)據(jù)庫引擎: postgres, mysql, sqlite -t, --tables 需要導入的表 -T, --skip-tables 需要排除的表 -C, --camel 使用用駝峰命名法 -n, --no-write 不需要寫入文件 -s, --schema 數(shù)據(jù)庫結(jié)構(gòu)
使用數(shù)據(jù)模型
這里是生成的一個示例模型:
- /* jshint indent: 2 */
- module.exports = function(sequelize, DataTypes) {
- return sequelize.define('d_user', {
- uid: {
- type: DataTypes.INTEGER(11).UNSIGNED,
- allowNull: false,
- primaryKey: true
- },
- username: {
- type: DataTypes.STRING(16),
- allowNull: false,
- defaultValue: ''
- },
- mobile: {
- type: DataTypes.STRING(16),
- allowNull: false,
- defaultValue: ''
- },
- email: {
- type: DataTypes.STRING(32),
- allowNull: false,
- defaultValue: ''
- },
- password: {
- type: DataTypes.STRING(32),
- allowNull: false,
- defaultValue: ''
- },
- salt: {
- type: DataTypes.STRING(8),
- allowNull: false,
- defaultValue: ''
- },
- updatedAt: {
- type: DataTypes.INTEGER(10).UNSIGNED,
- allowNull: false
- }
- }, {
- tableName: 'user'
- });
- };
創(chuàng)建數(shù)據(jù)庫模型:
- const Sequelize = require('sequelize'); const Db = new Sequelize('數(shù)據(jù)庫名', '用戶名', '密碼', { host: 'localhost', dialect: 'mysql' }) const User = Db.define('user', { uid: { type: Sequelize.INTEGER(11).UNSIGNED, allowNull: false, primaryKey: true }, username: { type: Sequelize.STRING(16), allowNull: false, defaultValue: '' }, mobile: { type: Sequelize.STRING(16), allowNull: false, defaultValue: '' }, email: { type: Sequelize.STRING(32), allowNull: false, defaultValue: '' }, password: { type: Sequelize.STRING(32), allowNull: false, defaultValue: '' }, salt: { type: Sequelize.STRING(8), allowNull: false, defaultValue: '' } }, { tableName: 'user', // 取消默認的時間戳, 否則會報 createdAt 不存在錯誤 timestamps: false }); Db.sync(); module.exports = { Db, User };
graphql-sequelize 轉(zhuǎn)換 MySQL -> GraphQL 結(jié)構(gòu)
- const { GraphQLObjectType,GraphQLSchema,GraphQLList,GraphQLInt,GraphQLString } = require('graphql');
- const { attributeFields, resolver } = require('graphql-sequelize');
- const { Db, User } = require('./db');
- userType = new GraphQLObjectType({
- name: 'User',
- description: 'A user',
- fields: attributeFields(User)
- });
- const Query = new GraphQLObjectType({
- name: 'Query',
- description: 'Root query object',
- fields: () => {
- return {
- user: {
- type: new GraphQLList(userType),
- args: {
- uid: {
- type: GraphQLInt
- },
- email: {
- type: GraphQLString
- }
- },
- resolve(root, args) {
- return Db.models.user.findAll({ where: args });
- }
- }
- };
- }
- });
- const Schema = new GraphQLSchema({
- query: Query
- });
- module.exports = Schema;
啟動服務器
- const Express =require( 'express');
- const GraphHTTP =require( 'express-graphql');
- const Schema =require( './schema');
- // Config
- const APP_PORT = 3000;
- // Start
- const app = Express();
- // GraphQL
- app.use('/graphql', GraphHTTP({
- schema: Schema,
- pretty: true,
- graphiql: true
- }));
- app.listen(APP_PORT, ()=> {
- console.log(`App listening on port ${APP_PORT}`);
責任編輯:龐桂玉
來源:
36大數(shù)據(jù)