77 строки
2.2 KiB
SQL
77 строки
2.2 KiB
SQL
SET @preparedStatement = (SELECT IF(
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(
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SELECT COUNT(*) FROM INFORMATION_SCHEMA.STATISTICS
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WHERE table_name = 'ChannelMembers'
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AND table_schema = DATABASE()
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AND index_name = 'idx_channelmembers_channel_id'
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) > 0,
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'SELECT 1',
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'CREATE INDEX idx_channelmembers_channel_id ON ChannelMembers(ChannelId);'
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));
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PREPARE createIndexIfNotExists FROM @preparedStatement;
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EXECUTE createIndexIfNotExists;
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DEALLOCATE PREPARE createIndexIfNotExists;
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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 table_name = 'ChannelMembers'
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AND table_schema = DATABASE()
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AND column_name = 'SchemeGuest'
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) > 0,
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'ALTER TABLE ChannelMembers DROP COLUMN SchemeGuest;',
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'SELECT 1'
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));
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PREPARE alterIfExists FROM @preparedStatement;
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EXECUTE alterIfExists;
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DEALLOCATE PREPARE alterIfExists;
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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 table_name = 'ChannelMembers'
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AND table_schema = DATABASE()
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AND column_name = 'SchemeAdmin'
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) > 0,
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'ALTER TABLE ChannelMembers DROP COLUMN SchemeAdmin;',
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'SELECT 1'
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));
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PREPARE alterIfExists FROM @preparedStatement;
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EXECUTE alterIfExists;
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DEALLOCATE PREPARE alterIfExists;
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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 table_name = 'ChannelMembers'
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AND table_schema = DATABASE()
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AND column_name = 'SchemeUser'
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) > 0,
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'ALTER TABLE ChannelMembers DROP COLUMN SchemeUser;',
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'SELECT 1'
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));
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PREPARE alterIfExists FROM @preparedStatement;
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EXECUTE alterIfExists;
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DEALLOCATE PREPARE alterIfExists;
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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 table_name = 'ChannelMembers'
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AND table_schema = DATABASE()
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AND index_name = 'idx_channelmembers_user_id'
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) > 0,
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'DROP INDEX idx_channelmembers_user_id ON ChannelMembers;',
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'SELECT 1'
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));
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PREPARE removeIndexIfExists FROM @preparedStatement;
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EXECUTE removeIndexIfExists;
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DEALLOCATE PREPARE removeIndexIfExists;
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DROP TABLE IF EXISTS ChannelMembers;
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