School Commit Init

2024-08-31 12:07:21 +03:00
commit 0b130ee18c
2801 changed files with 4720552 additions and 0 deletions
@@ -0,0 +1,218 @@
+-- Write SQL scripts that:
+-- a. modify the type of a column;
+-- b. add / remove a column;
+-- c. add / remove a DEFAULT constraint;
+-- d. add / remove a primary key;
+-- e. add / remove a candidate key;
+-- f. add / remove a foreign key;
+-- g. create / drop a table.
+
+-- For each of the scripts above, write another one that reverts the operation. Place each script in a stored procedure. Use a simple, intuitive naming convention.
+
+-- a. modify the type of a column;
+
+CREATE PROCEDURE setNameToVarChar100
+AS
+BEGIN
+    ALTER TABLE Decks
+    ALTER COLUMN name VARCHAR(100)
+END
+
+GO
+
+CREATE PROCEDURE setNameToVarChar255
+AS
+BEGIN
+    ALTER TABLE Decks
+    ALTER COLUMN name VARCHAR(255)
+END
+
+GO
+-- b. add / remove a column;
+
+CREATE PROCEDURE addColumnDescription
+AS
+BEGIN
+    ALTER TABLE Decks
+    ADD description VARCHAR(255)
+END
+
+GO
+
+CREATE PROCEDURE removeColumnDescription
+AS
+BEGIN
+    ALTER TABLE Decks
+    DROP COLUMN description
+END
+
+GO
+-- c. add / remove a DEFAULT constraint;
+
+CREATE PROCEDURE addDefaultToDescription
+AS
+BEGIN
+    ALTER TABLE Decks
+    ADD CONSTRAINT DF_Decks_description DEFAULT 'No description' FOR description
+END
+
+GO
+
+CREATE PROCEDURE removeDefaultFromDescription
+AS
+BEGIN
+    ALTER TABLE Decks
+    DROP CONSTRAINT DF_Decks_description
+END
+
+GO
+
+-- d. add / remove a primary key;
+
+CREATE PROCEDURE removePrimaryKeyFromJournalProgress
+AS
+BEGIN
+    ALTER TABLE JourneyProgress
+    DROP CONSTRAINT PK__JourneyP__2FA1EA2E0A91C8BD
+END
+
+GO
+
+CREATE PROCEDURE addPrimaryKeyToJournalProgress
+AS
+BEGIN
+    ALTER TABLE JourneyProgress
+    ADD CONSTRAINT PK__JourneyP__2FA1EA2E0A91C8BD PRIMARY KEY(hJourney, hPlayer)
+END
+
+GO
+
+-- e. add / remove a candidate key;
+
+CREATE PROCEDURE addCandidateKeyToDecks
+AS
+BEGIN
+    ALTER TABLE Decks
+    ADD CONSTRAINT CK_Decks_name UNIQUE(name)
+END
+
+GO
+
+CREATE PROCEDURE removeCandidateKeyFromDecks
+AS
+BEGIN
+    ALTER TABLE Decks
+    DROP CONSTRAINT CK_Decks_name
+END
+
+GO
+
+-- f. add / remove a foreign key;
+
+CREATE PROCEDURE removeForeignKeyFromJourneyProgress
+AS
+BEGIN
+    ALTER TABLE JourneyProgress
+    DROP CONSTRAINT  FK__JourneyPr__hPlay__031C6FA4 
+END
+
+GO
+
+CREATE PROCEDURE addForeignKeyToJourneyProgress
+AS
+BEGIN
+    ALTER TABLE JourneyProgress
+    ADD CONSTRAINT FK__JourneyPr__hPlay__031C6FA4 FOREIGN KEY(hPlayer) REFERENCES Players(hmy)
+END
+
+GO
+
+-- g. create / drop a table.
+
+CREATE PROCEDURE createTableSkillTree
+AS
+BEGIN
+    CREATE TABLE SkillTree(
+        hmy INT NOT NULL IDENTITY(1,1) PRIMARY KEY,
+        name VARCHAR(255) NOT NULL,
+        description VARCHAR(8000) NOT NULL,
+        hFaction INT NOT NULL references Factions(hmy),
+        hPlayer INT NOT NULL references Players(hmy),
+    )
+END
+
+GO
+
+CREATE PROCEDURE dropTableSkillTree
+AS
+BEGIN
+    DROP TABLE SkillTree
+END
+
+GO
+
+CREATE TABLE versionTable(
+    version INT NOT NULL
+)
+
+CREATE TABLE proceduresTable(
+    fromVersion INT NOT NULL,
+    toVersion INT NOT NULL,
+    procedureName VARCHAR(255) NOT NULL
+    PRIMARY KEY(fromVersion, toVersion)
+)
+
+INSERT INTO versionTable(version) VALUES(1)
+
+INSERT INTO proceduresTable(fromVersion, toVersion, procedureName) 
+VALUES
+(1, 2, 'setNameToVarChar100'),
+(2, 1, 'setNameToVarChar255'),
+(2, 3, 'addColumnDescription'),
+(3, 2, 'removeColumnDescription'),
+(3, 4, 'addDefaultToDescription'),
+(4, 3, 'removeDefaultFromDescription'),
+(4, 5, 'removePrimaryKeyFromJournalProgress'),
+(5, 4, 'addPrimaryKeyToJournalProgress'),
+(5, 6, 'addCandidateKeyToDecks'),
+(6, 5, 'removeCandidateKeyFromDecks'),
+(6, 7, 'removeForeignKeyFromJourneyProgress'),
+(7, 6, 'addForeignKeyToJourneyProgress'),
+(7, 8, 'createTableSkillTree'),
+(8, 7, 'dropTableSkillTree')
+
+GO
+
+CREATE PROCEDURE VersionSelector(@newVersion int)
+AS
+BEGIN TRANSACTION versionControl
+BEGIN TRY
+    DECLARE @currentVersion int
+    DECLARE @procedureName VARCHAR(255)
+    SET @currentVersion = (SELECT version FROM versionTable)
+    IF @newVersion > (SELECT MAX(toVersion) FROM proceduresTable)
+        RAISERROR('Invalid version', 16, 1)
+    IF @newVersion < (SELECT MIN(toVersion) FROM proceduresTable)
+        RAISERROR('Invalid version', 16, 1)
+    WHILE @currentVersion > @newVersion
+    BEGIN
+        SET @procedureName = (SELECT procedureName FROM proceduresTable WHERE fromVersion = @currentVersion AND toVersion = @currentVersion - 1)
+        EXEC @procedureName
+        SET @currentVersion = @currentVersion - 1
+    END
+    WHILE @currentVersion < @newVersion
+    BEGIN
+        SET @procedureName = (SELECT procedureName FROM proceduresTable WHERE fromVersion = @currentVersion AND toVersion = @currentVersion + 1)
+        EXEC @procedureName
+        SET @currentVersion = @currentVersion + 1
+    END
+    UPDATE versionTable SET version = @newVersion
+    COMMIT TRANSACTION versionControl
+END TRY
+BEGIN CATCH
+    ROLLBACK TRANSACTION versionControl
+    PRINT ERROR_PROCEDURE()
+    PRINT ERROR_MESSAGE()
+END CATCH
+
+EXECUTE VersionSelector 1