Perform the drop queries in a procedure to check for existance
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# This is a rollup of all database schema changes applied from 3.0.0 to 3.3.x
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ALTER TABLE `#__weblinks` DROP COLUMN `sid`;
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ALTER TABLE `#__weblinks` DROP COLUMN `date`;
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ALTER TABLE `#__weblinks` DROP COLUMN `archived`;
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ALTER TABLE `#__weblinks` DROP COLUMN `approved`;
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ALTER TABLE `#__weblinks` ENGINE=InnoDB;
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drop procedure if exists weblinks_schema_change;
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delimiter ';;'
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create procedure weblinks_schema_change() begin
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/* delete columns if they exist */
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if exists(SELECT * FROM information_schema.columns WHERE table_name = '#__weblinks' AND column_name = 'sid') THEN
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ALTER TABLE `#__weblinks` DROP COLUMN `sid`;
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end if;
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if exists(SELECT * FROM information_schema.columns WHERE table_name = '#__weblinks' AND column_name = 'date') THEN
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ALTER TABLE `#__weblinks` DROP COLUMN `date`;
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end if;
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if exists(SELECT * FROM information_schema.columns WHERE table_name = '#__weblinks' AND column_name = 'archived') THEN
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ALTER TABLE `#__weblinks` DROP COLUMN `archived`;
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end if;
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if exists(SELECT * FROM information_schema.columns WHERE table_name = '#__weblinks' AND column_name = 'approved') THEN
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ALTER TABLE `#__weblinks` DROP COLUMN `approved`;
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end if;
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end;;
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delimiter ';'
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call weblinks_schema_change();
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drop procedure if exists weblinks_schema_change;
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ALTER TABLE `#__weblinks` ENGINE=InnoDB;
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ALTER TABLE `#__weblinks` ADD COLUMN `version` int(10) unsigned NOT NULL DEFAULT '1';
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ALTER TABLE `#__weblinks` ADD COLUMN `images` text NOT NULL;
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