GraphQL 是一个开源的图形数据库(基于Node.js实现), 中文文档: https://graphql.js.cool/
sequelize-auto 将 MySQL 数据库转变成模型
- [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 参数: -h, --host 主机地址 [必须] -d, --database 数据名 [必须] -u, --user 用户名 -x, --pass 密码 -p, --port 端口号 -c, --config 配置文件,参考: https://sequelize.readthedocs.org/en/latest/api/sequelize/ -o, --output 输出目录 -e, --dialect 数据库引擎: postgres, mysql, sqlite -t, --tables 需要导入的表 -T, --skip-tables 需要排除的表 -C, --camel 使用用驼峰命名法 -n, --no-write 不需要写入文件 -s, --schema 数据库结构
使用数据模型
这里是生成的一个示例模型:
- /* 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'
- });
- };
创建数据库模型:
- const Sequelize = require('sequelize'); const Db = new Sequelize('数据库名', '用户名', '密码', { 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', // 取消默认的时间戳, 否则会报 createdAt 不存在错误 timestamps: false }); Db.sync(); module.exports = { Db, User };
graphql-sequelize 转换 MySQL -> GraphQL 结构
- 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;
启动服务器
- 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}`);
本文作者：佚名
来源：51CTO
