-- ================================================================
-- 贫困生认定申请表teacher_name字段修复脚本
-- 文件: database_fix_teacher_name_field.sql
-- 功能: 添加缺失的teacher_name字段
-- ================================================================

USE hzdyjs_xg;

-- 1. 检查并添加 teacher_name 字段
SELECT '开始检查 teacher_name 字段...' AS message;

-- 检查字段是否存在
SELECT
    COLUMN_NAME,
    IS_NULLABLE,
    COLUMN_DEFAULT,
    DATA_TYPE
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_SCHEMA = 'hzdyjs_xg'
  AND TABLE_NAME = 'jcbt_poverty_application'
  AND COLUMN_NAME = 'teacher_name';

-- 添加 teacher_name 字段（如果不存在）
SET @sql = '';
SELECT COUNT(*) INTO @count
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_SCHEMA = 'hzdyjs_xg'
  AND TABLE_NAME = 'jcbt_poverty_application'
  AND COLUMN_NAME = 'teacher_name';

SELECT IF(@count = 0,
    'ALTER TABLE jcbt_poverty_application ADD COLUMN teacher_name varchar(100) NULL COMMENT ''班主任教师姓名'' AFTER teacher_id;',
    'SELECT ''teacher_name 字段已存在'' AS result;'
) INTO @sql;

PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

SELECT '✅ teacher_name 字段检查完成' AS message;

-- 2. 验证修复结果
SELECT '=== 修复结果验证 ===' AS message;

-- 显示teacher相关字段信息
SELECT
    COLUMN_NAME AS '字段名',
    DATA_TYPE AS '数据类型',
    IS_NULLABLE AS '允许NULL',
    COLUMN_DEFAULT AS '默认值',
    COLUMN_COMMENT AS '注释'
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_SCHEMA = 'hzdyjs_xg'
  AND TABLE_NAME = 'jcbt_poverty_application'
  AND COLUMN_NAME LIKE '%teacher%'
ORDER BY ORDINAL_POSITION;

-- 3. 显示完整表结构确认
SELECT '=== 班级相关字段确认 ===' AS message;

SELECT
    COLUMN_NAME AS '字段名',
    DATA_TYPE AS '数据类型',
    IS_NULLABLE AS '允许NULL',
    COLUMN_COMMENT AS '注释'
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_SCHEMA = 'hzdyjs_xg'
  AND TABLE_NAME = 'jcbt_poverty_application'
  AND COLUMN_NAME IN (
    'class_id', 'class_name', 'teacher_id', 'teacher_name'
  )
ORDER BY ORDINAL_POSITION;

SELECT '🎉 teacher_name字段修复操作完成！' AS message;
SELECT '📝 请重启后端服务以生效！' AS note;