public static class DbContextConfigurer { public static void Configure(DbContextOptionsBuilder<DbContext> builder, string connectionString) { //builder.UseSqlServer(connectionString); //使用MSSQL builder //.UseLoggerFactory(MyLoggerFactory) .UseMySql(connectionString); //使用MySql } public static void Configure(DbContextOptionsBuilder<DbContext> builder, DbConnection connection) { //builder.UseSqlServer(connection); builder.UseMySql(connection); } } 用ABP模板生成的项目中，如果使用.netcore和EFcore, 就会有DbContextConfigurer，只要安装了Microsoft.entityframeworkcore.mysql, 就可以使用UseMySql这个扩展方法，
"ConnectionStrings": { //"Default": "Server=localhost; Database=Db3; Trusted_Connection=True;" "Default": "Server=localhost;port=3306;database=Db3;uid=root;password=root;character set=utf8;Old Guids=true" }, appsettings.json 里ConnectionStrings，也使用Mysql连接字符串，然后再PMC(程序包控制台)执行
update-dabase
然后再PMC(程序包控制台)执行
install-package Pomelo.EntityFrameworkCore.MySql
再执行update-dabase， 真的一切都好了，其实在ORM的抽象和实现方面，ABP都比较好的Module, 当家的是Microsoft的EF
Abp.EntityFrameWork.Common //EF的公共部分 Abp.EntityFrameWork //EF Abp.EntityFrameWorkCore //EFCore
还有来自Java阵营的
Abp.NHibernate
还有几个比较流行的，
Abp.Dapper //据说性能是ef几十倍的DapperAbp.MongoDB //nosql,KV和文档数据库Abp.MemoryDb //内存数据库，可用于单元测试，棒棒的
个人还是偏爱EF系列，特别是linux下用EFCore+Mysql, 是最佳组合，经过几个项目的实战，证明是个不错选择,可以放心使用！
ABP有关ORM的抽象机制，主要通过Repostitory和UnitOfWork来做的
namespace Abp.Domain.Repositories { /// <summary> /// This interface is implemented by all repositories to ensure implementation of fixed methods. 说白了就是CRUD得封装 /// </summary> /// <typeparam name="TEntity">Main Entity type this repository works on</typeparam> /// <typeparam name="TPrimaryKey">Primary key type of the entity</typeparam> public interface IRepository<TEntity, TPrimaryKey> : IRepository where TEntity : class, IEntity<TPrimaryKey> { #region Select/Get/Query ...#endregion #region Insert ...#endregion #region Update ...#endregion #region Delete ...#endregion #region Aggregates ...#endregion } } /// <summary> /// Defines a unit of work. /// This interface is internally used by ABP. 实际上就是数据库连接和事务的封装 /// Use <see cref="IUnitOfWorkManager.Begin()"/> to start a new unit of work. /// </summary> public interface IUnitOfWork : IActiveUnitOfWork, IUnitOfWorkCompleteHandle { /// <summary> /// Unique id of this UOW. /// </summary> string Id { get; } /// <summary> /// Reference to the outer UOW if exists. /// </summary> IUnitOfWork Outer { get; set; } /// <summary> /// Begins the unit of work with given options. /// </summary> /// <param name="options">Unit of work options</param> void Begin(UnitOfWorkOptions options); 具体我们在Service中，只要用DI就可以注入了，其实现机理，以EFCore为例
/// <summary> /// This module is used to implement "Data Access Layer" in EntityFramework. 类似Mybatis的数据访问层，在ABP中叫基础架构 /// </summary> [DependsOn(typeof(AbpKernelModule))] public class AbpEntityFrameworkCoreModule : AbpModule { 。。。private void RegisterGenericRepositoriesAndMatchDbContexes() { var dbContextTypes = _typeFinder.Find(type => type.IsPublic && !type.IsAbstract && type.IsClass && typeof(AbpDbContext).IsAssignableFrom(type) ); if (dbContextTypes.IsNullOrEmpty()) { Logger.Warn("No class found derived from AbpDbContext."); return; } using (var repositoryRegistrar = IocManager.ResolveAsDisposable<IEfCoreGenericRepositoryRegistrar>()) { foreach (var dbContextType in dbContextTypes) { Logger.Debug("Registering DbContext: " + dbContextType.AssemblyQualifiedName); repositoryRegistrar.Object.RegisterForDbContext(dbContextType, IocManager); } } 。。。 } } public class EfCoreGenericRepositoryRegistrar : IEfCoreGenericRepositoryRegistrar, ITransientDependency { 。。。public void RegisterForDbContext(Type dbContextType, IIocManager iocManager) { var autoRepositoryAttr = dbContextType.GetSingleAttributeOrNull<AutoRepositoryTypesAttribute>() ?? EfCoreAutoRepositoryTypes.Default; foreach (var entityTypeInfo in DbContextHelper.GetEntityTypeInfos(dbContextType)) { var primaryKeyType = EntityHelper.GetPrimaryKeyType(entityTypeInfo.EntityType); if (primaryKeyType == typeof(int)) { var genericRepositoryType = autoRepositoryAttr.RepositoryInterface.MakeGenericType(entityTypeInfo.EntityType); if (!iocManager.IsRegistered(genericRepositoryType)) { var implType = autoRepositoryAttr.RepositoryImplementation.GetGenericArguments().Length == 1 ? autoRepositoryAttr.RepositoryImplementation.MakeGenericType(entityTypeInfo.EntityType) : autoRepositoryAttr.RepositoryImplementation.MakeGenericType(entityTypeInfo.DeclaringType, entityTypeInfo.EntityType); iocManager.Register( genericRepositoryType, implType, DependencyLifeStyle.Transient ); } } var genericRepositoryTypeWithPrimaryKey = autoRepositoryAttr.RepositoryInterfaceWithPrimaryKey.MakeGenericType(entityTypeInfo.EntityType, primaryKeyType); if (!iocManager.IsRegistered(genericRepositoryTypeWithPrimaryKey)) { var implType = autoRepositoryAttr.RepositoryImplementationWithPrimaryKey.GetGenericArguments().Length == 2 ? autoRepositoryAttr.RepositoryImplementationWithPrimaryKey.MakeGenericType(entityTypeInfo.EntityType, primaryKeyType) : autoRepositoryAttr.RepositoryImplementationWithPrimaryKey.MakeGenericType(entityTypeInfo.DeclaringType, entityTypeInfo.EntityType, primaryKeyType); iocManager.Register( genericRepositoryTypeWithPrimaryKey, implType, DependencyLifeStyle.Transient ); } } } } 整个目的就是为了可以注入泛型的IRepostitory<TEntity, TPrimaryKey>,我们的service,就可以愉快的使用了
public IRepository<FoodMaterial, long> FoodMaterialRepository { get; set; } //属性注入 //或 private IRepository<FoodMaterialCategory, long> _categoryRepository; public FoodMaterialAppService(IRepository<FoodMaterial, long> repository , IRepository<FoodMaterialCategory, long> categoryRepository) : base(repository) { _categoryRepository = categoryRepository; } // 构造注入