102 lines
6.6 KiB
SQL
102 lines
6.6 KiB
SQL
-- =============================================
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-- Education 模块 — 练习会话与题目快照 DDL
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-- Ticket #6: 练习会话创建、题目快照、恢复与状态机
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-- Migration: 002
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-- Prerequisites: 000-education-schema.sql (database creation)
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-- 001-education-tenant-seed.sql (tenant seed data)
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-- =============================================
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-- =============================================
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-- Preconditions
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-- =============================================
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-- This migration MUST fail if either table already exists (no IF NOT EXISTS).
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-- Operator is expected to verify:
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-- SELECT COUNT(*) FROM information_schema.tables
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-- WHERE table_schema = DATABASE()
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-- AND table_name IN ('education_practice_session', 'education_practice_question');
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-- Result MUST be 0 before executing this migration.
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-- =============================================
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-- 练习会话表
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-- =============================================
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-- Indexes:
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-- uk_tenant_client_session — per-tenant uniqueness for clientSessionId idempotency.
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-- Used by: selectByTenantAndClientSessionId (idempotent create check),
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-- DuplicateKeyException catch for concurrent-create race resolution.
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-- idx_tenant_user_status — covers getCurrentSession (latest ACTIVE by tenant+user)
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-- and ownership queries. Column order: (tenant_id, user_id, status) so the
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-- index supports both filtering by tenant+user and tenant+user+status.
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-- Lock impact: INSERT acquires next-key lock on uk_tenant_client_session unique key;
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-- concurrent inserts with same (tenant_id, client_session_id) serialize naturally.
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-- No additional table-level locks required.
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CREATE TABLE `education_practice_session` (
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`id` BIGINT NOT NULL AUTO_INCREMENT COMMENT '会话主键',
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`tenant_id` BIGINT NOT NULL COMMENT '租户编号',
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`user_id` BIGINT NOT NULL COMMENT 'Member 用户编号',
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`client_session_id` VARCHAR(36) NOT NULL COMMENT '客户端生成的会话标识（UUID），用于幂等创建',
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`status` VARCHAR(20) NOT NULL DEFAULT 'ACTIVE'
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COMMENT '会话状态：ACTIVE-进行中, SUBMITTED-已提交, EXPIRED-已过期, CANCELLED-已取消',
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`question_count` INT NOT NULL DEFAULT 0 COMMENT '题目总数',
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`collection_id` VARCHAR(64) DEFAULT NULL COMMENT '源题集 ID',
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`node_id` VARCHAR(64) DEFAULT NULL COMMENT '源目录节点 ID',
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`type` VARCHAR(32) DEFAULT NULL COMMENT '筛选题型',
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`difficulty` VARCHAR(32) DEFAULT NULL COMMENT '筛选难度',
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`version` INT NOT NULL DEFAULT 0 COMMENT '乐观锁版本号',
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`creator` VARCHAR(64) DEFAULT '' COMMENT '创建者',
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`create_time` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
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`updater` VARCHAR(64) DEFAULT '' COMMENT '更新者',
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`update_time` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
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`deleted` BIT(1) NOT NULL DEFAULT b'0' COMMENT '是否删除',
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PRIMARY KEY (`id`),
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UNIQUE KEY `uk_tenant_client_session` (`tenant_id`, `client_session_id`),
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KEY `idx_tenant_user_status` (`tenant_id`, `user_id`, `status`)
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) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='教育-练习会话';
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-- =============================================
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-- 练习会话题目快照表
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-- =============================================
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-- Indexes:
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-- uk_session_sequence — per-session uniqueness for question sequence numbers.
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-- Used by: insertBatch to ensure no duplicate sequences within a session.
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-- idx_session_id — covers selectBySessionIdOrderBySequence (load all questions
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-- for a session, ordered by sequence). Also used by cascade delete lookups.
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-- Lock impact: INSERT acquires gap locks within session_id range on uk_session_sequence;
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-- concurrent inserts into different sessions are independent.
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-- Options column: JSON data type stores only label, content, order — never isCorrect.
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-- Application layer (optionsToSafeJson) strips correctness before storage.
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CREATE TABLE `education_practice_question` (
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`id` BIGINT NOT NULL AUTO_INCREMENT COMMENT '主键',
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`tenant_id` BIGINT NOT NULL COMMENT '租户编号',
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`session_id` BIGINT NOT NULL COMMENT '会话 ID',
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`sequence` INT NOT NULL COMMENT '题目序号（1-based，服务端固定）',
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`question_id` VARCHAR(64) NOT NULL COMMENT '原始题目 ID',
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`content_version` VARCHAR(64) NOT NULL DEFAULT '' COMMENT '快照时的题目内容版本',
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`stem` TEXT NOT NULL COMMENT '题干快照',
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`type` VARCHAR(32) NOT NULL COMMENT '题型快照',
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`difficulty` VARCHAR(32) DEFAULT NULL COMMENT '难度快照',
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`options` JSON NOT NULL COMMENT '选项快照 JSON（不含 isCorrect）',
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`selected_answer` TEXT DEFAULT NULL COMMENT '学生已选答案',
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`is_answered` BIT(1) NOT NULL DEFAULT b'0' COMMENT '是否已作答',
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`creator` VARCHAR(64) DEFAULT '' COMMENT '创建者',
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`create_time` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
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`updater` VARCHAR(64) DEFAULT '' COMMENT '更新者',
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`update_time` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
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`deleted` BIT(1) NOT NULL DEFAULT b'0' COMMENT '是否删除',
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PRIMARY KEY (`id`),
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UNIQUE KEY `uk_session_sequence` (`session_id`, `sequence`),
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KEY `idx_session_id` (`session_id`)
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) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='教育-练习会话题目快照';
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-- =============================================
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-- Post-migration verification queries
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-- =============================================
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-- Verify tables exist with correct structure:
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-- SHOW CREATE TABLE education_practice_session;
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-- SHOW CREATE TABLE education_practice_question;
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-- Verify unique keys are enforced:
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-- SHOW INDEX FROM education_practice_session WHERE Key_name = 'uk_tenant_client_session';
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-- SHOW INDEX FROM education_practice_question WHERE Key_name = 'uk_session_sequence';
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-- Verify no orphan data (should be 0 after fresh migration):
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-- SELECT COUNT(*) FROM education_practice_session;
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-- SELECT COUNT(*) FROM education_practice_question;
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