-- AIHR 案例学习点/主管点评迁移（MySQL 8.x）
-- 仅补齐案例学习字段，不写入业务内容；可重复执行。

SET @aihr_case_table_exists := (
  SELECT COUNT(*)
  FROM information_schema.TABLES
  WHERE TABLE_SCHEMA = DATABASE()
    AND TABLE_NAME = 'aihr_case_record'
);

SET @aihr_learning_points_exists := (
  SELECT COUNT(*)
  FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = DATABASE()
    AND TABLE_NAME = 'aihr_case_record'
    AND COLUMN_NAME = 'learning_points'
);
SET @aihr_learning_points_ddl := IF(
  @aihr_case_table_exists = 1 AND @aihr_learning_points_exists = 0,
  'ALTER TABLE aihr_case_record ADD COLUMN `learning_points` text DEFAULT NULL COMMENT ''案例学习点JSON'' AFTER `summary`',
  'SELECT 1'
);
PREPARE aihr_learning_points_stmt FROM @aihr_learning_points_ddl;
EXECUTE aihr_learning_points_stmt;
DEALLOCATE PREPARE aihr_learning_points_stmt;

SET @aihr_supervisor_comment_exists := (
  SELECT COUNT(*)
  FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = DATABASE()
    AND TABLE_NAME = 'aihr_case_record'
    AND COLUMN_NAME = 'supervisor_comment'
);
SET @aihr_supervisor_comment_ddl := IF(
  @aihr_case_table_exists = 1 AND @aihr_supervisor_comment_exists = 0,
  'ALTER TABLE aihr_case_record ADD COLUMN `supervisor_comment` varchar(1000) DEFAULT NULL COMMENT ''主管点评'' AFTER `learning_points`',
  'SELECT 1'
);
PREPARE aihr_supervisor_comment_stmt FROM @aihr_supervisor_comment_ddl;
EXECUTE aihr_supervisor_comment_stmt;
DEALLOCATE PREPARE aihr_supervisor_comment_stmt;