在Nestjs使用mysql和typeorm

1. 创建项目

nest new nest-mysql-test

2. 添加config

安装 @nestjs/config 包

pnpm i --save @nestjs/config

添加 .env 文件

DATABASE_HOST=localhost
DATABASE_PORT=3306
DATABASE_USERNAME=root
DATABASE_PASSWORD=123456
DATABASE_DB=dbtest

创建 config/database.config.ts 文件

import { registerAs } from '@nestjs/config';export default registerAs('database', () => ({type: process.env.DATABASE_TYPE || 'mysql',host: process.env.DATABASE_HOST || 'localhost',port: parseInt(process.env.DATABASE_PORT, 10) || 3306,username: process.env.DATABASE_USERNAME,password: process.env.DATABASE_PASSWORD,database: process.env.DATABASE_DB,
}));

添加 common 模块

nest g module common

修改 common.module.ts

import { Module } from '@nestjs/common';
import { ConfigModule } from '@nestjs/config';
import databseConfig from 'src/config/databse.config';@Module({imports: [ConfigModule.forRoot({isGlobal: true,load: [databseConfig],}),],
})
export class CommonModule {}

3. 添加typeorm

安装依赖包

pnpm install --save @nestjs/typeorm typeorm mysql2

修改 common.module.ts

import { Module } from '@nestjs/common';
import { ConfigModule, ConfigService } from '@nestjs/config';
import { TypeOrmModule } from '@nestjs/typeorm';
import databseConfig from 'src/config/databse.config';@Module({imports: [ConfigModule.forRoot({isGlobal: true,load: [databseConfig],}),TypeOrmModule.forRootAsync({imports: [ConfigModule],inject: [ConfigService],useFactory: (configService: ConfigService) => ({...configService.get('database'),entities: [],autoLoadEntities: true,synchronize: true,}),}),],
})
export class CommonModule {}

4. 添加实体

创建 entity/user.entity.ts 文件

import { Entity, Column, PrimaryGeneratedColumn } from 'typeorm';@Entity()
export class User {@PrimaryGeneratedColumn()id: number;@Column()firstName: string;@Column()lastName: string;@Column({ default: true })isActive: boolean;
}

在 common 模块中引入 user 实体

import { User } from '../entity/user.entity';@Module({imports: [...TypeOrmModule.forRootAsync({...useFactory: (configService: ConfigService) => ({...entities: [User],}),}),],
})
export class CommonModule {}

5. 运行项目