33 lines
1.2 KiB
MySQL
33 lines
1.2 KiB
MySQL
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-- ============================================
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-- 删除sys_user表中的phonenumber字段
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-- 注意：删除字段是危险操作，请先备份数据！
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-- ============================================
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-- 方法1：直接执行（推荐，MySQL 5.7+支持）
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-- 如果字段存在，直接删除
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ALTER TABLE `sys_user` DROP COLUMN `phonenumber`;
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-- 如果上面的语句不支持，使用下面的方法：
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-- 方法2：先检查再删除（兼容性更好）
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-- SET @exist := (SELECT COUNT(*) FROM information_schema.COLUMNS
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-- WHERE TABLE_SCHEMA = DATABASE()
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-- AND TABLE_NAME = 'sys_user'
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-- AND COLUMN_NAME = 'phonenumber');
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--
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-- SET @sqlstmt := IF(@exist > 0,
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-- 'ALTER TABLE `sys_user` DROP COLUMN `phonenumber`',
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-- 'SELECT ''phonenumber字段不存在'' as result');
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--
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-- PREPARE stmt FROM @sqlstmt;
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-- EXECUTE stmt;
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-- DEALLOCATE PREPARE stmt;
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-- 验证：查询sys_user表结构，确认phonenumber字段已删除
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-- 如果查询结果为空，说明字段已成功删除
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SELECT COLUMN_NAME, COLUMN_TYPE, COLUMN_COMMENT
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FROM information_schema.COLUMNS
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WHERE TABLE_SCHEMA = DATABASE()
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AND TABLE_NAME = 'sys_user'
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AND COLUMN_NAME = 'phonenumber';
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