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将索引缩短为 IX_CE_Offering_Status_WaitlistedAt。

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将候补迁移改为可重入：先检查列和索引是否存在，再执行 DDL。
附件中已经成功添加 WaitlistedAt、但索引创建失败的数据库可直接重试，不会报重复列。
运行时和 dotnet ef 连接统一开启 AllowUserVariables；Connector/NET 默认关闭该选项。Connector/NET 官方说明
增加所有 MySQL 索引名不得超过 64 字符的回归测试。
This commit is contained in:
biss
2026-07-26 16:24:52 +08:00 Unverified
parent f62cd21319
commit ec28eb6c16
9 changed files with 148 additions and 30 deletions
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src/Jiaowu.Api/Infrastructure/Persistence/Migrations/MySql/20260726170000_CourseSelectionWaitlist.cs
+80 -15
View File
@@ -12,26 +12,91 @@ public partial class CourseSelectionWaitlist : Migration
{
protected override void Up(MigrationBuilder migrationBuilder)
{
migrationBuilder.AddColumn<DateTime>(
name: "WaitlistedAt",
table: "CourseEnrollments",
type: "datetime(6)",
nullable: true);
migrationBuilder.Sql("""
SET @waitlisted_column_exists = (
SELECT COUNT(*)
FROM `INFORMATION_SCHEMA`.`COLUMNS`
WHERE `TABLE_SCHEMA` = DATABASE()
AND `TABLE_NAME` = 'CourseEnrollments'
AND `COLUMN_NAME` = 'WaitlistedAt'
);
""");
migrationBuilder.Sql("""
SET @add_waitlisted_column_sql = IF(
@waitlisted_column_exists = 0,
'ALTER TABLE `CourseEnrollments` ADD COLUMN `WaitlistedAt` datetime(6) NULL',
'SELECT 1'
);
""");
migrationBuilder.Sql(
"PREPARE add_waitlisted_column_stmt FROM @add_waitlisted_column_sql;");
migrationBuilder.Sql("EXECUTE add_waitlisted_column_stmt;");
migrationBuilder.Sql("DEALLOCATE PREPARE add_waitlisted_column_stmt;");
migrationBuilder.CreateIndex(
name: "IX_CourseEnrollments_CourseSelectionOfferingId_Status_WaitlistedAt",
table: "CourseEnrollments",
columns: new[] { "CourseSelectionOfferingId", "Status", "WaitlistedAt" });
migrationBuilder.Sql("""
SET @waitlist_index_exists = (
SELECT COUNT(*)
FROM `INFORMATION_SCHEMA`.`STATISTICS`
WHERE `TABLE_SCHEMA` = DATABASE()
AND `TABLE_NAME` = 'CourseEnrollments'
AND `INDEX_NAME` = 'IX_CE_Offering_Status_WaitlistedAt'
);
""");
migrationBuilder.Sql("""
SET @add_waitlist_index_sql = IF(
@waitlist_index_exists = 0,
'CREATE INDEX `IX_CE_Offering_Status_WaitlistedAt` ON `CourseEnrollments` (`CourseSelectionOfferingId`, `Status`, `WaitlistedAt`)',
'SELECT 1'
);
""");
migrationBuilder.Sql(
"PREPARE add_waitlist_index_stmt FROM @add_waitlist_index_sql;");
migrationBuilder.Sql("EXECUTE add_waitlist_index_stmt;");
migrationBuilder.Sql("DEALLOCATE PREPARE add_waitlist_index_stmt;");
}
protected override void Down(MigrationBuilder migrationBuilder)
{
migrationBuilder.DropIndex(
name: "IX_CourseEnrollments_CourseSelectionOfferingId_Status_WaitlistedAt",
table: "CourseEnrollments");
migrationBuilder.Sql("""
SET @waitlist_index_exists = (
SELECT COUNT(*)
FROM `INFORMATION_SCHEMA`.`STATISTICS`
WHERE `TABLE_SCHEMA` = DATABASE()
AND `TABLE_NAME` = 'CourseEnrollments'
AND `INDEX_NAME` = 'IX_CE_Offering_Status_WaitlistedAt'
);
""");
migrationBuilder.Sql("""
SET @drop_waitlist_index_sql = IF(
@waitlist_index_exists > 0,
'DROP INDEX `IX_CE_Offering_Status_WaitlistedAt` ON `CourseEnrollments`',
'SELECT 1'
);
""");
migrationBuilder.Sql(
"PREPARE drop_waitlist_index_stmt FROM @drop_waitlist_index_sql;");
migrationBuilder.Sql("EXECUTE drop_waitlist_index_stmt;");
migrationBuilder.Sql("DEALLOCATE PREPARE drop_waitlist_index_stmt;");
migrationBuilder.DropColumn(
name: "WaitlistedAt",
table: "CourseEnrollments");
migrationBuilder.Sql("""
SET @waitlisted_column_exists = (
SELECT COUNT(*)
FROM `INFORMATION_SCHEMA`.`COLUMNS`
WHERE `TABLE_SCHEMA` = DATABASE()
AND `TABLE_NAME` = 'CourseEnrollments'
AND `COLUMN_NAME` = 'WaitlistedAt'
);
""");
migrationBuilder.Sql("""
SET @drop_waitlisted_column_sql = IF(
@waitlisted_column_exists > 0,
'ALTER TABLE `CourseEnrollments` DROP COLUMN `WaitlistedAt`',
'SELECT 1'
);
""");
migrationBuilder.Sql(
"PREPARE drop_waitlisted_column_stmt FROM @drop_waitlisted_column_sql;");
migrationBuilder.Sql("EXECUTE drop_waitlisted_column_stmt;");
migrationBuilder.Sql("DEALLOCATE PREPARE drop_waitlisted_column_stmt;");
}
}
src/Jiaowu.Api/Infrastructure/Persistence/Migrations/MySql/20260726180000_CourseSelectionGradeLimits.Designer.cs
Generated
+2 -1
View File
@@ -748,7 +748,8 @@ namespace Jiaowu.Api.Infrastructure.Persistence.Migrations.MySql
b.HasIndex("StudentId", "Status");
b.HasIndex("CourseSelectionOfferingId", "Status", "WaitlistedAt");
b.HasIndex("CourseSelectionOfferingId", "Status", "WaitlistedAt")
.HasDatabaseName("IX_CE_Offering_Status_WaitlistedAt");
b.ToTable("CourseEnrollments");
});
src/Jiaowu.Api/Infrastructure/Persistence/Migrations/MySql/AppDbContextModelSnapshot.cs
+2 -1
View File
@@ -745,7 +745,8 @@ namespace Jiaowu.Api.Infrastructure.Persistence.Migrations.MySql
b.HasIndex("StudentId", "Status");
b.HasIndex("CourseSelectionOfferingId", "Status", "WaitlistedAt");
b.HasIndex("CourseSelectionOfferingId", "Status", "WaitlistedAt")
.HasDatabaseName("IX_CE_Offering_Status_WaitlistedAt");
b.ToTable("CourseEnrollments");
});