预演

src/Jiaowu.Api/Infrastructure/Persistence/DevelopmentSqliteMigrator.cs

@@ -62,6 +62,8 @@ public sealed class DevelopmentSqliteMigrator(
         "20260726_33_background_job_outbox";
     private const string CourseAdjustmentOccurrencesMigration =
         "20260727_34_course_adjustment_occurrences";
+    private const string AcademicPlanningPrerequisitesMigration =
+        "20260727_35_academic_planning_prerequisites";
 
     public async Task MigrateAsync(CancellationToken cancellationToken = default)
     {
@@ -453,6 +455,19 @@ public sealed class DevelopmentSqliteMigrator(
             BackgroundJobOutboxMigration,
             backgroundJobOutboxExists ? [] : BackgroundJobOutboxStatements,
             cancellationToken);
+
+        var coursePrerequisitesExist = await db.Database
+            .SqlQueryRaw<int>(
+                """
+                SELECT COUNT(*) AS "Value"
+                FROM sqlite_master
+                WHERE type = 'table' AND name = 'CoursePrerequisites'
+                """)
+            .AnyAsync(value => value > 0, cancellationToken);
+        await ApplyMigrationAsync(
+            AcademicPlanningPrerequisitesMigration,
+            coursePrerequisitesExist ? [] : AcademicPlanningPrerequisiteStatements,
+            cancellationToken);
     }
 
     private async Task ApplyMigrationAsync(
@@ -2090,4 +2105,31 @@ public sealed class DevelopmentSqliteMigrator(
         ON "BackgroundJobOutboxMessages" ("State", "CompletedAt");
         """
     ];
+
+    private static readonly string[] AcademicPlanningPrerequisiteStatements =
+    [
+        """
+        CREATE TABLE "CoursePrerequisites" (
+            "Id" TEXT NOT NULL CONSTRAINT "PK_CoursePrerequisites" PRIMARY KEY,
+            "CourseId" TEXT NOT NULL,
+            "PrerequisiteCourseId" TEXT NOT NULL,
+            "CreatedAt" TEXT NOT NULL,
+            "UpdatedAt" TEXT NOT NULL,
+            CONSTRAINT "FK_CoursePrerequisites_Courses_CourseId"
+                FOREIGN KEY ("CourseId") REFERENCES "Courses" ("Id")
+                ON DELETE CASCADE,
+            CONSTRAINT "FK_CoursePrerequisites_Courses_PrerequisiteCourseId"
+                FOREIGN KEY ("PrerequisiteCourseId") REFERENCES "Courses" ("Id")
+                ON DELETE RESTRICT
+        );
+        """,
+        """
+        CREATE UNIQUE INDEX "IX_CoursePrerequisites_CourseId_PrerequisiteCourseId"
+        ON "CoursePrerequisites" ("CourseId", "PrerequisiteCourseId");
+        """,
+        """
+        CREATE INDEX "IX_CoursePrerequisites_PrerequisiteCourseId"
+        ON "CoursePrerequisites" ("PrerequisiteCourseId");
+        """
+    ];
 }