58 lines
1.3 KiB
Markdown
58 lines
1.3 KiB
Markdown
# 数据库回滚模式 (Hyperf Migration)
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## 安全回滚策略
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### 添加字段（可回滚）
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```php
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// Migration up()
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Schema::table('users', function (Blueprint $table) {
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$table->string('avatar_url')->nullable()->after('email');
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});
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// Migration down()
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Schema::table('users', function (Blueprint $table) {
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$table->dropColumn('avatar_url');
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});
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```
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### 删除字段（不可逆 — 需预备份）
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```sql
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-- 删除前先备份
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CREATE TABLE _backup_users_phone AS
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SELECT id, phone FROM users WHERE phone IS NOT NULL;
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```
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### 重命名字段（分步迁移）
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```php
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// Step 1: 添加新列
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Schema::table('users', function (Blueprint $table) {
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$table->string('display_name')->nullable()->after('name');
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});
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// Step 2: 迁移数据
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DB::statement('UPDATE users SET display_name = name');
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// Step 3: 删除旧列（下一个迁移文件）
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Schema::table('users', function (Blueprint $table) {
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$table->dropColumn('name');
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});
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```
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### 类型变更（分步迁移）
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```
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Step 1: 添加新列 → Step 2: 迁移数据 → Step 3: 删除旧列
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```
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## 回滚命令
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```bash
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# 回滚最近一次迁移
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php bin/hyperf.php migrate:rollback
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# 回滚最近 N 次迁移
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php bin/hyperf.php migrate:rollback --step=3
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# 查看迁移状态
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php bin/hyperf.php migrate:status
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```
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