-- ================================================================
-- 贫困生认定申请表完整修复脚本
-- 文件: database_fix_jcbt_poverty_application_complete.sql
-- 功能: 修复 teacher_id 字段默认值问题，添加 family_economy_summary 字段
-- ================================================================

USE hzdyjs_xg;

-- 1. 检查并修复 teacher_id 字段
SELECT '开始检查 teacher_id 字段...' AS message;

-- 检查字段是否存在以及是否允许NULL
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_id';

-- 修改 teacher_id 字段为允许NULL（如果字段存在且不允许NULL）
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_id'
  AND IS_NULLABLE = 'NO';

SELECT IF(@count > 0,
    CONCAT('ALTER TABLE jcbt_poverty_application MODIFY COLUMN teacher_id bigint(20) NULL COMMENT ''班主任教师ID'';'),
    'SELECT ''teacher_id 字段已允许NULL或不存在'' AS result;'
) INTO @sql;

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

SELECT '✅ teacher_id 字段修复完成' AS message;

-- 2. 检查并添加 family_economy_summary 字段
SELECT '开始检查 family_economy_summary 字段...' AS message;

SET @sql = '';
SELECT COUNT(*) INTO @count
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_SCHEMA = 'hzdyjs_xg'
           AND TABLE_NAME = 'jcbt_poverty_application'
  AND COLUMN_NAME = 'family_economy_summary';

SELECT IF(@count = 0,
    'ALTER TABLE jcbt_poverty_application ADD COLUMN family_economy_summary text COMMENT ''家庭经济情况摘要'' AFTER assistance_type_names;',
    'SELECT ''family_economy_summary 字段已存在'' AS result;'
) INTO @sql;

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

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

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

-- 显示相关字段信息
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 IN ('teacher_id', 'family_economy_summary')
ORDER BY ORDINAL_POSITION;

-- 4. 显示完整表结构（关键字段）
SELECT '=== 表结构确认 ===' 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 (
    'id', 'student_id', 'class_id', 'teacher_id',
    'family_economy_summary', 'status', 'create_by', 'create_time'
  )
ORDER BY ORDINAL_POSITION;

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