王军
3 years ago
10 changed files with 229 additions and 74 deletions
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# EFCore |
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## 创建时间,更新时间,删除时间 |
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- 当实体继承了这三个属性得时候,只有在新增才会又创建时间,如果想要也有更新时间如何处理呢？ |
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- 解决方式:重写 DbContext 一下方法 |
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```csharp |
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namespace Lion.AbpPro.EntityFrameworkCore |
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{ |
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[ConnectionStringName("Default")] |
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public class AbpProDbContext : |
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AbpDbContext<AbpProDbContext>, |
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IAbpProDbContext |
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{ |
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protected override void SetCreationAuditProperties(EntityEntry entry) |
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{ |
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SetModificationAuditProperties(entry); |
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base.SetCreationAuditProperties(entry); |
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} |
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protected override void SetDeletionAuditProperties(EntityEntry entry) |
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{ |
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SetModificationAuditProperties(entry); |
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base.SetDeletionAuditProperties(entry); |
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} |
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} |
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} |
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``` |
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## 设置数据库字符集格式 |
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```csharp |
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namespace Lion.AbpPro.EntityFrameworkCore |
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{ |
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[ConnectionStringName("Default")] |
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public class AbpProDbContext : |
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AbpDbContext<AbpProDbContext>, |
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IAbpProDbContext |
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{ |
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protected override void OnModelCreating(ModelBuilder builder) |
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{ |
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builder.UseCollation("utf8mb4_unicode_ci"); |
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builder.UseGuidCollation("utf8mb4_unicode_ci"); |
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base.OnModelCreating(builder); |
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} |
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} |
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} |
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``` |
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## 全局设置字符串长度 |
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- 当数据类型是 string 时,需要给每个字段指定长度很麻烦,以下提供统一处理方式。 |
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```csharp |
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namespace Lion.Pro.EntityFrameworkCore; |
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/// <summary> |
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/// ef迁移全局设置 |
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/// </summary> |
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public static class LionDbContextGlobalSettingExtensions |
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{ |
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private const string Remark = "Remark"; |
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private const string Description = "Description"; |
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private const string CreationTime = "CreationTime"; |
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private const string IndexPrefix = "IX_Default_"; |
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public static void ConfigureGlobalSetting(this ModelBuilder builder) |
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{ |
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ConfigureDefaultMaxLength(builder); |
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ConfigureIndexForCreationTime(builder); |
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} |
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/// <summary> |
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/// 配置默认字符串长度 |
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/// </summary> |
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private static void ConfigureDefaultMaxLength(ModelBuilder builder) |
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{ |
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var rules = ConfigureEntityMaxLengthOptions.Configure(); |
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// 如果是abp表不全局修改长度 |
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foreach (var property in builder.Model |
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.GetEntityTypes() |
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.Where(e => !e.GetTableName().StartsWith(AbpCommonDbProperties.DbTablePrefix)) |
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.SelectMany(t => t.GetProperties()) |
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.Where(e => e.ClrType == typeof(string))) |
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{ |
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// 默认设置128长度 |
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if (property.GetMaxLength() == null) |
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{ |
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property.SetMaxLength(128); |
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} |
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} |
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} |
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/// <summary> |
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/// 创建时间添加索引 |
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/// </summary> |
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private static void ConfigureIndexForCreationTime(ModelBuilder builder) |
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{ |
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foreach (var property in builder.Model |
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.GetEntityTypes() |
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.Where(e => !e.GetTableName().StartsWith(AbpCommonDbProperties.DbTablePrefix)) |
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.SelectMany(t => t.GetProperties()) |
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.Where(e => e.Name == CreationTime)) |
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{ |
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var entityType = builder.Model.GetEntityTypes().Where(e => e.ClrType == property.DeclaringEntityType.ClrType).ToList().FirstOrDefault(); |
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var indexName = IndexPrefix + entityType.GetTableName() + "_" + property.Name; |
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if (entityType.FindIndex(indexName) == null) |
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{ |
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entityType?.AddIndex(property, indexName); |
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} |
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} |
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} |
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} |
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``` |
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```csharp |
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namespace Lion.AbpPro.EntityFrameworkCore |
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{ |
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[ConnectionStringName("Default")] |
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public class AbpProDbContext : |
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AbpDbContext<AbpProDbContext>, |
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IAbpProDbContext |
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{ |
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protected override void OnModelCreating(ModelBuilder builder) |
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{ |
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builder.ConfigureGlobalSetting(); |
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base.OnModelCreating(builder); |
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} |
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} |
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} |
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``` |
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@ -1,5 +1,5 @@ |
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## 编译 |
# 编译 |
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### VS 编译项目字符串超过 256 个字符 |
## VS 编译项目字符串超过 256 个字符 |
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|
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- 把项目拷贝到磁盘根目录 OR 使用 Rider 开发 |
- 把项目拷贝到磁盘根目录 OR 使用 Rider 开发 |
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