39 lines
1.3 KiB
SQL
39 lines
1.3 KiB
SQL
-- 为菜单表添加 delete_time 字段（软删除）
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-- 如果字段已存在，则不会重复添加
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SET @dbname = DATABASE();
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SET @tablename = 'yz_menus';
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SET @columnname = 'delete_time';
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SET @preparedStatement = (SELECT IF(
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(
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SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
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WHERE
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(TABLE_SCHEMA = @dbname)
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AND (TABLE_NAME = @tablename)
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AND (COLUMN_NAME = @columnname)
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) > 0,
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'SELECT "Column delete_time already exists in yz_menus" AS "";',
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'ALTER TABLE yz_menus ADD COLUMN delete_time DATETIME DEFAULT NULL COMMENT ''删除时间（软删除）'' AFTER update_time;'
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));
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PREPARE alterIfNotExists FROM @preparedStatement;
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EXECUTE alterIfNotExists;
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DEALLOCATE PREPARE alterIfNotExists;
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-- 添加索引以优化查询性能
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SET @indexname = 'idx_delete_time';
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SET @preparedStatement = (SELECT IF(
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(
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SELECT COUNT(*) FROM INFORMATION_SCHEMA.STATISTICS
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WHERE
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(TABLE_SCHEMA = @dbname)
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AND (TABLE_NAME = @tablename)
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AND (INDEX_NAME = @indexname)
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) > 0,
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'SELECT "Index idx_delete_time already exists in yz_menus" AS "";',
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'ALTER TABLE yz_menus ADD INDEX idx_delete_time (delete_time);'
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));
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PREPARE alterIfNotExists FROM @preparedStatement;
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EXECUTE alterIfNotExists;
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DEALLOCATE PREPARE alterIfNotExists;
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