如何解决EF Core：SQLite 删除不是级联的
我正在尝试使用 sqlite 和 Entity Framework Core 将数据库添加到我的 WPF 应用程序。除了 .Remove() 调用之外，一切似乎都正常工作，该调用按预期删除元素，但不会级联到其他表。
上下文类：
public class PersistenceContext : DbContext
{
public DbSet<Server> Servers { get; set; }
public DbSet<Network> Networks { get; set; }
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
optionsBuilder.UseLazyLoadingProxies();
optionsBuilder.Usesqlite("foreign keys=true;Data Source=" + Path.Combine(App.ApplicationPath,"persistence","data.db"));
optionsBuilder.UseLoggerFactory(LoggerFactory.Create(builder => builder.AddConsole()));
base.OnConfiguring(optionsBuilder);
}
}
public void RemoveEntity(Entity entity)
{
lock (persistenceContext)
{
switch (entity)
{
case Server server:
persistenceContext.Servers.Remove(server);
break;
case Network network:
persistenceContext.Networks.Remove(network);
break;
}
persistenceContext.SaveChanges();
}
}
Add-Migration Initial 生成的迁移类：
public partial class InitialCreate : Migration
{
protected override void Up(MigrationBuilder migrationBuilder)
{
migrationBuilder.CreateTable(
name: "JavaSettings",columns: table => new
{
Id = table.Column<int>(type: "INTEGER",nullable: false)
.Annotation("sqlite:Autoincrement",true),MaxRam = table.Column<int>(type: "INTEGER",nullable: false),JavaPath = table.Column<string>(type: "TEXT",nullable: true),StartupParameters = table.Column<string>(type: "TEXT",nullable: true)
},constraints: table =>
{
table.PrimaryKey("PK_JavaSettings",x => x.Id);
});
migrationBuilder.CreateTable(
name: "ServerVersion",Type = table.Column<int>(type: "INTEGER",Version = table.Column<string>(type: "TEXT",Build = table.Column<int>(type: "INTEGER",JarLink = table.Column<string>(type: "TEXT",constraints: table =>
{
table.PrimaryKey("PK_ServerVersion",x => x.Id);
});
migrationBuilder.CreateTable(
name: "SimpleTime",Hours = table.Column<int>(type: "INTEGER",Minutes = table.Column<int>(type: "INTEGER",nullable: false)
},constraints: table =>
{
table.PrimaryKey("PK_SimpleTime",x => x.Id);
});
migrationBuilder.CreateTable(
name: "Networks",columns: table => new
{
UID = table.Column<string>(type: "TEXT",Name = table.Column<string>(type: "TEXT",ProxyType = table.Column<int>(type: "INTEGER",JavaSettingsId = table.Column<int>(type: "INTEGER",SyncServers = table.Column<bool>(type: "INTEGER",Initialized = table.Column<bool>(type: "INTEGER",StartWithFork = table.Column<bool>(type: "INTEGER",ServerIconId = table.Column<int>(type: "INTEGER",VersionId = table.Column<int>(type: "INTEGER",constraints: table =>
{
table.PrimaryKey("PK_Networks",x => x.UID);
table.ForeignKey(
name: "FK_Networks_JavaSettings_JavaSettingsId",column: x => x.JavaSettingsId,principalTable: "JavaSettings",principalColumn: "Id",onDelete: referentialAction.Cascade);
table.ForeignKey(
name: "FK_Networks_ServerVersion_VersionId",column: x => x.VersionId,principalTable: "ServerVersion",onDelete: referentialAction.Cascade);
});
migrationBuilder.CreateTable(
name: "RestartTime",Enabled = table.Column<bool>(type: "INTEGER",TimeId = table.Column<int>(type: "INTEGER",constraints: table =>
{
table.PrimaryKey("PK_RestartTime",x => x.Id);
table.ForeignKey(
name: "FK_RestartTime_SimpleTime_TimeId",column: x => x.TimeId,principalTable: "SimpleTime",onDelete: referentialAction.Cascade);
});
migrationBuilder.CreateTable(
name: "StartTime",constraints: table =>
{
table.PrimaryKey("PK_StartTime",x => x.Id);
table.ForeignKey(
name: "FK_StartTime_SimpleTime_TimeId",onDelete: referentialAction.Cascade);
});
migrationBuilder.CreateTable(
name: "StopTime",constraints: table =>
{
table.PrimaryKey("PK_StopTime",x => x.Id);
table.ForeignKey(
name: "FK_StopTime_SimpleTime_TimeId",onDelete: referentialAction.Cascade);
});
migrationBuilder.CreateTable(
name: "Servers",AutoSetSha1 = table.Column<bool>(type: "INTEGER",ResourcePackHashAge = table.Column<DateTime>(type: "TEXT",Restart1Id = table.Column<int>(type: "INTEGER",Restart2Id = table.Column<int>(type: "INTEGER",Restart3Id = table.Column<int>(type: "INTEGER",Restart4Id = table.Column<int>(type: "INTEGER",AutoStop1Id = table.Column<int>(type: "INTEGER",AutoStop2Id = table.Column<int>(type: "INTEGER",AutoStart1Id = table.Column<int>(type: "INTEGER",AutoStart2Id = table.Column<int>(type: "INTEGER",constraints: table =>
{
table.PrimaryKey("PK_Servers",x => x.UID);
table.ForeignKey(
name: "FK_Servers_JavaSettings_JavaSettingsId",onDelete: referentialAction.Cascade);
table.ForeignKey(
name: "FK_Servers_RestartTime_Restart1Id",column: x => x.Restart1Id,principalTable: "RestartTime",onDelete: referentialAction.Cascade);
table.ForeignKey(
name: "FK_Servers_RestartTime_Restart2Id",column: x => x.Restart2Id,onDelete: referentialAction.Cascade);
table.ForeignKey(
name: "FK_Servers_RestartTime_Restart3Id",column: x => x.Restart3Id,onDelete: referentialAction.Cascade);
table.ForeignKey(
name: "FK_Servers_RestartTime_Restart4Id",column: x => x.Restart4Id,onDelete: referentialAction.Cascade);
table.ForeignKey(
name: "FK_Servers_ServerVersion_VersionId",onDelete: referentialAction.Cascade);
table.ForeignKey(
name: "FK_Servers_StartTime_AutoStart1Id",column: x => x.AutoStart1Id,principalTable: "StartTime",onDelete: referentialAction.Cascade);
table.ForeignKey(
name: "FK_Servers_StartTime_AutoStart2Id",column: x => x.AutoStart2Id,onDelete: referentialAction.Cascade);
table.ForeignKey(
name: "FK_Servers_StopTime_AutoStop1Id",column: x => x.AutoStop1Id,principalTable: "StopTime",onDelete: referentialAction.Cascade);
table.ForeignKey(
name: "FK_Servers_StopTime_AutoStop2Id",column: x => x.AutoStop2Id,onDelete: referentialAction.Cascade);
});
migrationBuilder.CreateIndex(
name: "IX_Networks_JavaSettingsId",table: "Networks",column: "JavaSettingsId");
migrationBuilder.CreateIndex(
name: "IX_Networks_VersionId",column: "VersionId");
migrationBuilder.CreateIndex(
name: "IX_RestartTime_TimeId",table: "RestartTime",column: "TimeId");
migrationBuilder.CreateIndex(
name: "IX_Servers_AutoStart1Id",table: "Servers",column: "AutoStart1Id");
migrationBuilder.CreateIndex(
name: "IX_Servers_AutoStart2Id",column: "AutoStart2Id");
migrationBuilder.CreateIndex(
name: "IX_Servers_AutoStop1Id",column: "AutoStop1Id");
migrationBuilder.CreateIndex(
name: "IX_Servers_AutoStop2Id",column: "AutoStop2Id");
migrationBuilder.CreateIndex(
name: "IX_Servers_JavaSettingsId",column: "JavaSettingsId");
migrationBuilder.CreateIndex(
name: "IX_Servers_Restart1Id",column: "Restart1Id");
migrationBuilder.CreateIndex(
name: "IX_Servers_Restart2Id",column: "Restart2Id");
migrationBuilder.CreateIndex(
name: "IX_Servers_Restart3Id",column: "Restart3Id");
migrationBuilder.CreateIndex(
name: "IX_Servers_Restart4Id",column: "Restart4Id");
migrationBuilder.CreateIndex(
name: "IX_Servers_VersionId",column: "VersionId");
migrationBuilder.CreateIndex(
name: "IX_StartTime_TimeId",table: "StartTime",column: "TimeId");
migrationBuilder.CreateIndex(
name: "IX_StopTime_TimeId",table: "StopTime",column: "TimeId");
}
protected override void Down(MigrationBuilder migrationBuilder)
{
migrationBuilder.DropTable(
name: "Networks");
migrationBuilder.DropTable(
name: "Servers");
migrationBuilder.DropTable(
name: "JavaSettings");
migrationBuilder.DropTable(
name: "RestartTime");
migrationBuilder.DropTable(
name: "ServerVersion");
migrationBuilder.DropTable(
name: "StartTime");
migrationBuilder.DropTable(
name: "StopTime");
migrationBuilder.DropTable(
name: "SimpleTime");
}
}
我搜索了这个问题，发现 sqlite 默认没有启用级联，所以我在连接字符串中添加了 foreign keys=true;。
我也以防万一向这样的每个连接添加了 PRAGMA foreign_keys = ON：
persistenceContext.Database.GetDbConnection().StateChange += (sender,args) =>
{
if (args.CurrentState == ConnectionState.Open)
{
persistenceContext.Database.ExecutesqlRaw("PRAGMA foreign_keys = ON");
}
};
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