58 lines
3.0 KiB
SQL
58 lines
3.0 KiB
SQL
-- Rename article "father" columns to "parent" (SQL Server / MSSQL).
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--
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-- One-off manual migration (no migration code is kept in the repo).
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-- sqlcmd -S <server> -d <db> -E -i scripts/migrate-parent-rename.mssql.sql
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--
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-- Wrapped in a transaction and guarded so it is safe to re-run.
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-- Drop the existing index explicitly: SQL Server will not let a filtered
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-- unique index be carried over to a renamed column.
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SET XACT_ABORT ON;
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BEGIN TRANSACTION;
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-- Drop the old filtered unique index (references fathersort).
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IF EXISTS (SELECT 1 FROM sys.indexes WHERE name = 'UQ_article_fatherarticle_fathersort')
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DROP INDEX UQ_article_fatherarticle_fathersort ON article;
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-- Drop the default constraints bound to the old column names.
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IF EXISTS (SELECT 1 FROM sys.default_constraints WHERE name = 'DF_article_is_father')
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ALTER TABLE article DROP CONSTRAINT DF_article_is_father;
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IF EXISTS (SELECT 1 FROM sys.default_constraints WHERE name = 'DF_article_fathersort')
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ALTER TABLE article DROP CONSTRAINT DF_article_fathersort;
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-- Drop foreign keys bound to the old columns.
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IF EXISTS (SELECT 1 FROM sys.foreign_keys WHERE name = 'FK_article_fatherarticle')
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ALTER TABLE article DROP CONSTRAINT FK_article_fatherarticle;
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IF EXISTS (SELECT 1 FROM sys.foreign_keys WHERE name = 'FK_article_fatherattributename')
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ALTER TABLE article DROP CONSTRAINT FK_article_fatherattributename;
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-- Rename the columns (sp_rename keeps indexes/FKs tracking the column).
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IF COL_LENGTH('article', 'fatherarticle_id') IS NOT NULL
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AND COL_LENGTH('article', 'parentarticle_id') IS NULL
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EXEC sp_rename 'article.fatherarticle_id', 'parentarticle_id', 'COLUMN';
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IF COL_LENGTH('article', 'fatherattributename_id') IS NOT NULL
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AND COL_LENGTH('article', 'parentattributename_id') IS NULL
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EXEC sp_rename 'article.fatherattributename_id', 'parentattributename_id', 'COLUMN';
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IF COL_LENGTH('article', 'fathersort') IS NOT NULL
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AND COL_LENGTH('article', 'parentsort') IS NULL
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EXEC sp_rename 'article.fathersort', 'parentsort', 'COLUMN';
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IF COL_LENGTH('article', 'is_father') IS NOT NULL
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AND COL_LENGTH('article', 'is_parent') IS NULL
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EXEC sp_rename 'article.is_father', 'is_parent', 'COLUMN';
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-- Recreate the constraints under their new names.
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IF NOT EXISTS (SELECT 1 FROM sys.foreign_keys WHERE name = 'FK_article_parentarticle')
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ALTER TABLE article ADD CONSTRAINT FK_article_parentarticle
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FOREIGN KEY (parentarticle_id) REFERENCES article(id) ON DELETE NO ACTION;
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IF NOT EXISTS (SELECT 1 FROM sys.foreign_keys WHERE name = 'FK_article_parentattributename')
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ALTER TABLE article ADD CONSTRAINT FK_article_parentattributename
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FOREIGN KEY (parentattributename_id) REFERENCES attributename(id) ON DELETE NO ACTION;
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ALTER TABLE article ADD CONSTRAINT DF_article_is_parent DEFAULT (0) FOR is_parent;
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ALTER TABLE article ADD CONSTRAINT DF_article_parentsort DEFAULT (0) FOR parentsort;
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CREATE UNIQUE INDEX UQ_article_parentarticle_parentsort
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ON article (parentarticle_id, parentsort)
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WHERE parentarticle_id IS NOT NULL;
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COMMIT TRANSACTION; |