Module: XMigra::MSSQLSpecifics

Defined in:
lib/xmigra/db_support/mssql.rb

Defined Under Namespace

Classes: StatisticsObject

Constant Summary collapse

SYSTEM_NAME = 
'Microsoft SQL Server'
IDENTIFIER_SUBPATTERN = 
'[a-z_@#][a-z0-9@$#_]*|"[^\[\]"]+"|\[[^\[\]]+\]'
DBNAME_PATTERN = 
/^
  (?:(#{IDENTIFIER_SUBPATTERN})\.)?
  (#{IDENTIFIER_SUBPATTERN})
$/ix
STATISTICS_FILE = 
'statistics-objects.yaml'
ID_COLLATION = 
'Latin1_General_CS_AS'

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.init_schema(schema_config) ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 1221

def init_schema(schema_config)
  Console.output_section "Microsoft SQL Server Specifics" do
    if Console.yes_no("Use more verbose syntax compatible with SQL Server 2005", :no)
      schema_config.dbinfo["MSSQL 2005 compatible"] = true
      puts "Configured for SQL Server 2005 compatibility mode."
    end
  end
end

.object_type_codes(type) ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 1209

def object_type_codes(type)
  case type
  when StoredProcedure then %w{P PC}
  when View then ['V']
  when Function then %w{AF FN FS FT IF TF}
  end
end

.string_literal(s) ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 1217

def string_literal(s)
  "N'#{s.gsub("'","''")}'"
end

.strip_identifier_quoting(s) ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 1200

def strip_identifier_quoting(s)
  case
  when s.empty? then return s
  when s[0,1] == "[" && s[-1,1] == "]" then return s[1..-2]
  when s[0,1] == '"' && s[-1,1] == '"' then return s[1..-2]
  else return s
  end
end

Instance Method Details

#alter_table_columns_sql_statements(col_pairs) ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 1192

def alter_table_columns_sql_statements(col_pairs)
  col_pairs.map do |_, col|
    nullability = (col.nullable? ? "" : "NOT ") + "NULL"
    "ALTER TABLE #{name} ALTER COLUMN #{col.name} #{col.type} #{nullability};"
  end
end

#amend_script_parts(parts) ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 123

def amend_script_parts(parts)
  parts.insert_after(
    :create_and_fill_indexes_table_sql,
    :create_and_fill_statistics_table_sql
  )
  parts.insert_after(
    :remove_undesired_indexes_sql,
    :remove_undesired_statistics_sql
  )
  parts.insert_after(:create_new_indexes_sql, :create_new_statistics_sql)
end

#batch_separator ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 1016

def batch_separator
  "GO\n"
end

#branch_id_literal ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 1066

def branch_id_literal
  @mssql_branch_id_literal ||= MSSQLSpecifics.string_literal(XMigra.secure_digest(branch_identifier))
end

#branch_upgrade_sql ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 1081

def branch_upgrade_sql
  return unless respond_to? :branch_identifier
  
  parts = [<<-"END_OF_SQL"]
IF #{upgrading_to_new_branch_test_sql}
BEGIN
  PRINT N'Migrating from previous schema branch:';
  
  DECLARE @sqlcmd NVARCHAR(MAX);
  
  DECLARE CmdCursor CURSOR LOCAL FOR
  SELECT bu.[UpgradeSql]
  FROM [xmigra].[branch_upgrade] bu
  WHERE bu.[Next] = #{branch_id_literal}
  ORDER BY bu.[ApplicationOrder] ASC;
  
  OPEN CmdCursor;
  
  FETCH NEXT FROM CmdCursor INTO @sqlcmd;
  
  WHILE @@FETCH_STATUS = 0 BEGIN
EXECUTE sp_executesql @sqlcmd;

FETCH NEXT FROM CmdCursor INTO @sqlcmd;
  END;
  
  CLOSE CmdCursor;
  DEALLOCATE CmdCursor;
  
  DECLARE @applied NVARCHAR(80);
  DECLARE @old_branch NVARCHAR(80);
  
  SELECT TOP(1) @applied = [CompletesMigration], @old_branch = [Current]
  FROM [xmigra].[branch_upgrade]
  WHERE [Next] = #{branch_id_literal};
  
  -- Delete the "applied" record for the migration if there was one, so that
  -- a new record with this ID can be inserted.
  DELETE FROM [xmigra].[applied] WHERE [MigrationID] = @applied;
  
  -- Create a "version bridge" record in the "applied" table for the branch upgrade
  INSERT INTO [xmigra].[applied] ([MigrationID], [VersionBridgeMark], [Description])
  VALUES (@applied, 1, N'Branch upgrade from branch ' + @old_branch);
END;

DELETE FROM [xmigra].[branch_upgrade];

  END_OF_SQL
  
  if branch_upgrade.applicable? migrations
    batch_template = <<-"END_OF_SQL"
INSERT INTO [xmigra].[branch_upgrade]
([Current], [Next], [CompletesMigration], [UpgradeSql])
VALUES (
  #{branch_id_literal},
  #{MSSQLSpecifics.string_literal(branch_upgrade.target_branch)},
  #{MSSQLSpecifics.string_literal(branch_upgrade.migration_completed_id)},
  %s
);
    END_OF_SQL
    
    each_batch(branch_upgrade.sql) do |batch|
      # Insert the batch into the [xmigra].[branch_upgrade] table
      parts << (batch_template % MSSQLSpecifics.string_literal(batch))
    end
  else
    # Insert a placeholder that only declares the current branch of the schema
    parts << <<-"END_OF_SQL"
INSERT INTO [xmigra].[branch_upgrade] ([Current]) VALUES (#{branch_id_literal});
    END_OF_SQL
  end
  
  return parts.join("\n")
end

#check_chain_continuity_sql ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 475

def check_chain_continuity_sql
  <<-"END_OF_SQL"
IF NOT #{upgrading_to_new_branch_test_sql}
BEGIN
  PRINT N'Checking migration chain continuity:';
  -- Get the [xmigra].[migrations] ApplicationOrder of the most recent version bridge migration
  DECLARE @BridgePoint INT;
  SET @BridgePoint = (
SELECT COALESCE(MAX(m.[ApplicationOrder]), 0)
FROM [xmigra].[applied] a
INNER JOIN [xmigra].[migrations] m
  ON a.[MigrationID] = m.[MigrationID]
WHERE a.[VersionBridgeMark] <> 0
  );
  
  -- Test for previously applied migrations that break the continuity of the
  -- migration chain in this script:
  IF EXISTS (
SELECT *
FROM [xmigra].[applied] a
INNER JOIN [xmigra].[migrations] m
  ON a.[MigrationID] = m.[MigrationID]
INNER JOIN [xmigra].[migrations] p
  ON m.[ApplicationOrder] - 1 = p.[ApplicationOrder]
WHERE p.[ApplicationOrder] > @BridgePoint
AND p.[MigrationID] NOT IN (
  SELECT a2.[MigrationID] FROM [xmigra].[applied] a2
)
  )
  BEGIN
RAISERROR(
  N'Previously applied migrations interrupt the continuity of the migration chain',
  11,
  1
);
  END;
END;
  END_OF_SQL
end

#check_execution_environment_sql ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 135

def check_execution_environment_sql
  <<-"END_OF_SQL"
PRINT N'Checking execution environment:';
IF DB_NAME() IN ('master', 'tempdb', 'model', 'msdb')
BEGIN
  RAISERROR(N'Please select an appropriate target database for the update script.', 11, 1);
END;
  END_OF_SQL
end

#check_existence_sql(for_existence, error_message) ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 1020

def check_existence_sql(for_existence, error_message)
  error_message = sprintf(error_message, quoted_name)
  
  return <<-"END_OF_SQL"

IF #{"NOT" if for_existence} #{existence_test_sql}
RAISERROR(N'#{error_message}', 11, 1);
  END_OF_SQL
end

#check_preceding_migrations_sql ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 433

def check_preceding_migrations_sql
  parts = []
  
  parts << (<<-"END_OF_SQL") if production 
IF EXISTS (
  SELECT TOP(1) * FROM [xmigra].[branch_upgrade]
) AND NOT EXISTS (
  SELECT TOP(1) * FROM [xmigra].[branch_upgrade]
  WHERE #{branch_id_literal} IN ([Current], [Next])
)
RAISERROR (N'Existing database is from a different (and non-upgradable) branch.', 11, 1);

  END_OF_SQL
  
  parts << (<<-"END_OF_SQL")
IF NOT #{upgrading_to_new_branch_test_sql}
BEGIN
  PRINT N'Checking preceding migrations:';
  -- Get the ApplicationOrder of the most recent version bridge migration
  DECLARE @VersionBridge INT;
  SET @VersionBridge = (
SELECT COALESCE(MAX([ApplicationOrder]), 0)
FROM [xmigra].[applied]
WHERE [VersionBridgeMark] <> 0
  );
  
  -- Check for existence of applied migrations after the latest version
  -- bridge that are not in [xmigra].[migrations]
  IF EXISTS (
SELECT * FROM [xmigra].[applied] a
WHERE a.[ApplicationOrder] > @VersionBridge
AND a.[MigrationID] NOT IN (
  SELECT m.[MigrationID] FROM [xmigra].[migrations] m
)
  )
  RAISERROR (N'Unknown in-branch migrations have been applied.', 11, 1);
END;
  END_OF_SQL
  
  return parts.join('')
end

#create_and_fill_indexes_table_sql ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 372

def create_and_fill_indexes_table_sql
  intro = <<-"END_OF_SQL"
PRINT N'Creating and filling index manipulation table:';
IF EXISTS (
  SELECT * FROM sys.objects
  WHERE object_id = OBJECT_ID(N'[xmigra].[updated_indexes]')
  AND type IN (N'U')
)
BEGIN
  DROP TABLE [xmigra].[updated_indexes];
END;
GO

CREATE TABLE [xmigra].[updated_indexes] (
  [IndexID]                  NVARCHAR(80) NOT NULL PRIMARY KEY
);
GO

  END_OF_SQL
  
  insertion = <<-"END_OF_SQL"
INSERT INTO [xmigra].[updated_indexes] ([IndexID]) VALUES
  END_OF_SQL
  
  strlit = MSSQLSpecifics.method :string_literal
  return intro + (insertion + indexes.collect do |index|
    "(#{strlit[index.id]})"
  end.join(",\n") + ";\n" unless indexes.empty?).to_s
end

#create_and_fill_migration_table_sql ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 325

def create_and_fill_migration_table_sql
  intro = <<-"END_OF_SQL"
IF EXISTS (
  SELECT * FROM sys.objects
  WHERE object_id = OBJECT_ID(N'[xmigra].[migrations]')
  AND type IN (N'U')
)
BEGIN
  DROP TABLE [xmigra].[migrations];
END;
GO

CREATE TABLE [xmigra].[migrations] (
  [MigrationID]            nvarchar(80) COLLATE #{ID_COLLATION} NOT NULL,
  [ApplicationOrder]       int NOT NULL,
  [Description]            ntext NOT NULL,
  [Install]                bit NOT NULL DEFAULT(0)
);
GO

  END_OF_SQL
  
  mig_insert = <<-"END_OF_SQL"
INSERT INTO [xmigra].[migrations] (
  [MigrationID],
  [ApplicationOrder],
  [Description]
) VALUES
  END_OF_SQL
  
  if (@db_info || {}).fetch('MSSQL 2005 compatible', false).eql?(true)
    parts = [intro]
    (0...migrations.length).each do |i|
      m = migrations[i]
      description_literal = MSSQLSpecifics.string_literal(m.description.strip)
      parts << mig_insert + "(N'#{m.id}', #{i + 1}, #{description_literal});\n"
    end
    return parts.join('')
  else
    return intro + mig_insert + (0...migrations.length).collect do |i|
      m = migrations[i]
      description_literal = MSSQLSpecifics.string_literal(m.description.strip)
      "(N'#{m.id}', #{i + 1}, #{description_literal})"
    end.join(",\n") + ";\n"
  end
end

#create_and_fill_statistics_table_sql ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 402

def create_and_fill_statistics_table_sql
  intro = <<-"END_OF_SQL"
PRINT N'Creating and filling statistics object manipulation table:';
IF EXISTS (
  SELECT * FROM sys.objects
  WHERE object_id = OBJECT_ID(N'[xmigra].[updated_statistics]')
  AND type in (N'U')
)
BEGIN
  DROP TABLE [xmigra].[updated_statistics];
END;
GO

CREATE TABLE [xmigra].[updated_statistics] (
  [Name] nvarchar(100) NOT NULL PRIMARY KEY,
  [Columns] nvarchar(256) NOT NULL
);
GO

  END_OF_SQL
  
  insertion = <<-"END_OF_SQL"
INSERT INTO [xmigra].[updated_statistics] ([Name], [Columns]) VALUES
  END_OF_SQL
  
  strlit = MSSQLSpecifics.method :string_literal
  return intro + (insertion + stats_objs.collect do |stats_obj|
    "(#{strlit[stats_obj.name]}, #{strlit[stats_obj.columns]})"
  end.join(",\n") + ";\n" unless stats_objs.empty?).to_s
end

#create_new_indexes_sql ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 749

def create_new_indexes_sql
  indexes.collect do |index|
    index_id_literal = MSSQLSpecifics.string_literal(index.id)
    index_name_literal = MSSQLSpecifics.string_literal(index.name)
    <<-"END_OF_SQL"
PRINT N'Index ' + #{index_id_literal} + ':';
IF EXISTS(
  SELECT * FROM [xmigra].[updated_indexes] ui
  WHERE ui.[IndexID] = #{index_id_literal}
  AND ui.[IndexID] NOT IN (
SELECT i.[IndexID] FROM [xmigra].[indexes] i
  )
)
BEGIN
  IF EXISTS (
SELECT * FROM sys.indexes
WHERE [name] = #{index_name_literal}
  )
  BEGIN
RAISERROR(N'An index already exists named %s', 11, 1, #{index_name_literal});
  END;
  
  PRINT N'    Creating...';
  #{index.definition_sql};
  
  IF (SELECT COUNT(*) FROM sys.indexes WHERE [name] = #{index_name_literal}) <> 1
  BEGIN
RAISERROR(N'Index %s was not created by its definition.', 11, 1,
  #{index_name_literal});
  END;

  INSERT INTO [xmigra].[indexes] ([IndexID], [name])
  VALUES (#{index_id_literal}, #{index_name_literal});
END
ELSE
BEGIN
  PRINT N'    Already exists.';
END;
    END_OF_SQL
  end.join(ddl_block_separator)
end

#create_new_statistics_sql ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 791

def create_new_statistics_sql
  stats_objs.collect do |stats_obj|
    stats_name = MSSQLSpecifics.string_literal(stats_obj.name)
    strlit = lambda {|s| MSSQLSpecifics.string_literal(s)}
    
    stats_obj.creation_sql
    <<-"END_OF_SQL"
PRINT N'Statistics object #{stats_obj.name}:';
IF EXISTS (
  SELECT * FROM [xmigra].[updated_statistics] us
  WHERE us.[Name] = #{stats_name}
  AND us.[Columns] NOT IN (
SELECT s.[Columns]
FROM [xmigra].[statistics] s
WHERE s.[Name] = us.[Name]
  )
)
BEGIN
  IF EXISTS (
SELECT * FROM sys.stats
WHERE [name] = #{stats_name}
  )
  BEGIN
RAISERROR(N'A statistics object named %s already exists.', 11, 1, #{stats_name})
  END;
  
  PRINT N'    Creating...';
  #{stats_obj.creation_sql}
  
  INSERT INTO [xmigra].[statistics] ([Name], [Columns])
  VALUES (#{stats_name}, #{strlit[stats_obj.columns]})
END
ELSE
BEGIN
  PRINT N'    Already exists.';
END;
    END_OF_SQL
  end.join(ddl_block_separator)
end

#creation_notice ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 1030

def creation_notice
  return "PRINT " + MSSQLSpecifics.string_literal("Creating #{printable_type} #{quoted_name}:") + ";"
end

#ddl_block_separator ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 41

def ddl_block_separator; "\nGO\n"; end

#each_batch(sql) ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 999

def each_batch(sql)
  current_batch_lines = []
  sql.each_line do |line|
    if line.strip.upcase == 'GO'
      batch = current_batch_lines.join('')
      yield batch unless batch.strip.empty?
      current_batch_lines.clear
    else
      current_batch_lines << line
    end
  end
  unless current_batch_lines.empty?
    batch = current_batch_lines.join('')
    yield batch unless batch.strip.empty?
  end
end

#ensure_permissions_table_sql ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 840

def ensure_permissions_table_sql
  strlit = MSSQLSpecifics.method(:string_literal)
  <<-"END_OF_SQL"
-- ------------ SET UP XMIGRA PERMISSION TRACKING OBJECTS ------------ --

PRINT N'Setting up XMigra permission tracking:';
IF NOT EXISTS (
  SELECT * FROM sys.schemas
  WHERE name = N'xmigra'
)
BEGIN
  EXEC sp_executesql N'
CREATE SCHEMA [xmigra] AUTHORIZATION [dbo];
  ';
END;
GO

IF NOT EXISTS(
  SELECT * FROM sys.objects
  WHERE object_id = OBJECT_ID(N'[xmigra].[revokable_permissions]')
  AND type IN (N'U')
)
BEGIN
  CREATE TABLE [xmigra].[revokable_permissions] (
[permissions] nvarchar(200) NOT NULL,
[object] nvarchar(260) NOT NULL,
[principal_id] int NOT NULL
  ) ON [PRIMARY];
END;
GO

IF EXISTS(
  SELECT * FROM sys.objects
  WHERE object_id = OBJECT_ID(N'[xmigra].[ip_prepare_revoke]')
  AND type IN (N'P', N'PC')
)
BEGIN
  DROP PROCEDURE [xmigra].[ip_prepare_revoke];
END;
GO

CREATE PROCEDURE [xmigra].[ip_prepare_revoke]
(
  @permissions nvarchar(200),
  @object nvarchar(260),
  @principal sysname
)
AS
BEGIN
  INSERT INTO [xmigra].[revokable_permissions] ([permissions], [object], [principal_id])
  VALUES (@permissions, @object, DATABASE_PRINCIPAL_ID(@principal));
END;
  END_OF_SQL
end

#ensure_version_tables_sql ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 145

def ensure_version_tables_sql
  <<-"END_OF_SQL"
PRINT N'Ensuring version tables:';
IF NOT EXISTS (
  SELECT * FROM sys.schemas
  WHERE name = N'xmigra'
)
BEGIN
  EXEC sp_executesql N'
CREATE SCHEMA [xmigra] AUTHORIZATION [dbo];
  ';
END;
GO

IF NOT EXISTS (
  SELECT * FROM sys.objects
  WHERE object_id = OBJECT_ID(N'[xmigra].[applied]')
  AND type IN (N'U')
)
BEGIN
  CREATE TABLE [xmigra].[applied] (
[MigrationID]            nvarchar(80) COLLATE #{ID_COLLATION} NOT NULL,
[ApplicationOrder]       int IDENTITY(1,1) NOT NULL,
[VersionBridgeMark]      bit NOT NULL,
[Description]            nvarchar(max) NOT NULL,

CONSTRAINT [PK_version] PRIMARY KEY CLUSTERED (
  [MigrationID] ASC
) WITH (
  PAD_INDEX = OFF,
  STATISTICS_NORECOMPUTE  = OFF,
  IGNORE_DUP_KEY = OFF,
  ALLOW_ROW_LOCKS = ON,
  ALLOW_PAGE_LOCKS = ON
) ON [PRIMARY]
  ) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY];
END;
GO

IF NOT EXISTS (
  SELECT * FROM sys.columns
  WHERE object_id = OBJECT_ID(N'[xmigra].[applied]')
  AND name = N'MigrationID'
  AND collation_name = N'#{ID_COLLATION}'
)
BEGIN
  ALTER TABLE xmigra.applied DROP CONSTRAINT PK_version;
  ALTER TABLE xmigra.applied ALTER COLUMN [MigrationID] nvarchar(80) COLLATE Latin1_General_CS_AS NOT NULL;
  ALTER TABLE xmigra.applied ADD CONSTRAINT PK_version PRIMARY KEY ([MigrationID] ASC) WITH (
PAD_INDEX = OFF,
STATISTICS_NORECOMPUTE  = OFF,
IGNORE_DUP_KEY = OFF,
ALLOW_ROW_LOCKS = ON,
ALLOW_PAGE_LOCKS = ON
  ) ON [PRIMARY];
END;

IF NOT EXISTS (
  SELECT * FROM sys.objects
  WHERE object_id = OBJECT_ID(N'[xmigra].[previous_states]')
  AND type IN (N'U')
)
BEGIN
  CREATE TABLE [xmigra].[previous_states] (
[Changed]                   datetime NOT NULL,
[MigrationApplicationOrder] int NOT NULL,
[FromMigrationID]           nvarchar(80) COLLATE #{ID_COLLATION},
[ToRangeStartMigrationID]   nvarchar(80) COLLATE #{ID_COLLATION} NOT NULL,
[ToRangeEndMigrationID]     nvarchar(80) COLLATE #{ID_COLLATION} NOT NULL,

CONSTRAINT [PK_previous_states] PRIMARY KEY CLUSTERED (
  [Changed] ASC,
  [MigrationApplicationOrder] ASC
)
  );
END;
GO

IF NOT EXISTS (
  SELECT * FROM sys.objects
  WHERE object_id = OBJECT_ID(N'[xmigra].[DF_version_VersionBridgeMark]')
  AND type IN (N'D')
)
BEGIN
  ALTER TABLE [xmigra].[applied] ADD CONSTRAINT [DF_version_VersionBridgeMark]
DEFAULT (0) FOR [VersionBridgeMark];
END;
GO

IF NOT EXISTS (
  SELECT * FROM sys.objects
  WHERE object_id = OBJECT_ID(N'[xmigra].[access_objects]')
  AND type IN (N'U')
)
BEGIN
  CREATE TABLE [xmigra].[access_objects] (
[type] nvarchar(40) NOT NULL,
[name] nvarchar(256) NOT NULL,
[order] int identity(1,1) NOT NULL,

CONSTRAINT [PK_access_objects] PRIMARY KEY CLUSTERED (
  [name] ASC
) WITH (
  PAD_INDEX = OFF,
  STATISTICS_NORECOMPUTE  = OFF,
  IGNORE_DUP_KEY = OFF,
  ALLOW_ROW_LOCKS = ON,
  ALLOW_PAGE_LOCKS = ON
) ON [PRIMARY]
  ) ON [PRIMARY];
END;
GO

IF NOT EXISTS (
  SELECT * FROM sys.objects
  WHERE object_id = OBJECT_ID(N'[xmigra].[indexes]')
  AND type in (N'U')
)
BEGIN
  CREATE TABLE [xmigra].[indexes] (
[IndexID] nvarchar(80) NOT NULL PRIMARY KEY,
[name] nvarchar(256) NOT NULL
  ) ON [PRIMARY];
END;

IF NOT EXISTS (
  SELECT * FROM sys.objects
  WHERE object_id = OBJECT_ID(N'[xmigra].[statistics]')
  AND type in (N'U')
)
BEGIN
  CREATE TABLE [xmigra].[statistics] (
[Name] nvarchar(100) NOT NULL PRIMARY KEY,
[Columns] nvarchar(256) NOT NULL
  ) ON [PRIMARY];
END;

IF NOT EXISTS (
  SELECT * FROM sys.objects
  WHERE object_id = OBJECT_ID(N'[xmigra].[branch_upgrade]')
  AND type in (N'U')
)
BEGIN
  CREATE TABLE [xmigra].[branch_upgrade] (
[ApplicationOrder] int identity(1,1) NOT NULL,
[Current] nvarchar(80) COLLATE #{ID_COLLATION} NOT NULL PRIMARY KEY,
[Next] nvarchar(80) COLLATE #{ID_COLLATION} NULL,
[UpgradeSql] nvarchar(max) NULL,
[CompletesMigration] nvarchar(80) COLLATE #{ID_COLLATION} NULL
  ) ON [PRIMARY];
END;
GO
ALTER TABLE [xmigra].[branch_upgrade] ALTER COLUMN [CompletesMigration] nvarchar(80) COLLATE #{ID_COLLATION} NULL;

IF EXISTS (
  SELECT * FROM sys.objects
  WHERE object_id = OBJECT_ID(N'[xmigra].[last_applied_migrations]')
  AND type IN (N'V')
)
BEGIN
  DROP VIEW [xmigra].[last_applied_migrations];
END;
GO

CREATE VIEW [xmigra].[last_applied_migrations] AS
SELECT
  ROW_NUMBER() OVER (ORDER BY a.[ApplicationOrder] DESC) AS [RevertOrder],
  a.[Description]
FROM
  [xmigra].[applied] a
WHERE
  a.[ApplicationOrder] > COALESCE((
SELECT TOP (1) ps.[MigrationApplicationOrder]
FROM [xmigra].[previous_states] ps
JOIN [xmigra].[applied] a2 ON ps.[ToRangeStartMigrationID] = a2.[MigrationID]
ORDER BY ps.[Changed] DESC
  ), 0);
  END_OF_SQL
end

#existence_test_sql ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 1054

def existence_test_sql
  object_type_list = object_type_codes.collect {|t| "N'#{t}'"}.join(', ')
  
  return <<-"END_OF_SQL"
EXISTS (
  SELECT * FROM sys.objects
  WHERE object_id = OBJECT_ID(N'#{quoted_name}')
  AND type IN (#{object_type_list})
)
  END_OF_SQL
end

#filename_metavariable ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 42

def filename_metavariable; "[{filename}]"; end

#function_definition_template_sql ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 1180

def function_definition_template_sql
  <<-"END_OF_SQL"
CREATE FUNCTION [{filename}] (
  <<<parameters>>>
) RETURNS <<<return-type>>>
AS BEGIN
  <<<statements>>>
  RETURN <<<return-value-expression>>>;
END
END_OF_SQL
end

#grant_permissions_sql(permissions, object, principal) ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 945

def grant_permissions_sql(permissions, object, principal)
  strlit = MSSQLSpecifics.method(:string_literal)
  permissions_string = permissions.to_a.join(', ')
  
  <<-"END_OF_SQL"
PRINT N'Granting #{permissions_string} on #{object} to #{principal}:';
GRANT #{permissions_string} ON #{object} TO #{principal};
EXEC [xmigra].[ip_prepare_revoke] #{strlit[permissions_string]}, #{strlit[object]}, #{strlit[principal]};
  END_OF_SQL
end

#granting_permissions_comment_sql ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 937

def granting_permissions_comment_sql
  <<-"END_OF_SQL"
  
-- ---------------------- GRANTING PERMISSIONS ----------------------- --

  END_OF_SQL
end

#in_ddl_transaction(options = {}) ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 60

def in_ddl_transaction(options={})
  parts = []
  parts << <<-"END_OF_SQL"
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

SET ANSI_PADDING ON
GO

SET NOCOUNT ON
GO
-------------------- ERROR REFERENCE LINE --------------------
DECLARE @BATCH_START_OFFSET INTEGER; SET @BATCH_START_OFFSET = 0;
BEGIN TRY
  BEGIN TRAN;
  END_OF_SQL
  
  offset_lines = 5
  each_batch(yield) do |batch|
    batch_literal = MSSQLSpecifics.string_literal("\n" + batch)
    parts << "SET @BATCH_START_OFFSET = #{offset_lines}; EXEC sp_executesql @statement = #{batch_literal}; SET @BATCH_START_OFFSET = 0;"
    offset_lines += parts[-1].count("\n") + 1
  end
  
  if options[:dry_run]
    parts << "  PRINT N'Dry-run successful.  Rolling back changes.'; ROLLBACK TRAN;"
  else
    parts << "  COMMIT TRAN;"
  end
  parts << <<-"END_OF_SQL"
END TRY
BEGIN CATCH
  ROLLBACK TRAN;
  
  DECLARE @ErrorMessage NVARCHAR(4000);
  DECLARE @ErrorSeverity INT;
  DECLARE @ErrorState INT;
  
  PRINT N'Update failed: ' + ERROR_MESSAGE();
  PRINT N'    State: ' + CAST(ERROR_STATE() AS NVARCHAR);
  PRINT N'    Line: ' + CAST(@BATCH_START_OFFSET + ERROR_LINE() - 1 AS NVARCHAR) + N' after ERROR REFERENCE LINE'

  SELECT 
  @ErrorMessage = N'Update failed: ' + ERROR_MESSAGE(),
  @ErrorSeverity = ERROR_SEVERITY(),
  @ErrorState = ERROR_STATE();

  -- Use RAISERROR inside the CATCH block to return error
  -- information about the original error that caused
  -- execution to jump to the CATCH block.
  RAISERROR (@ErrorMessage, -- Message text.
         @ErrorSeverity, -- Severity.
         @ErrorState -- State.
         );
END CATCH;
  END_OF_SQL
  
  return parts.join("\n")
end

#index_template_sql ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 1156

def index_template_sql
  <<-"END_OF_SQL"
CREATE INDEX [{filename}]
ON <<<table>>> (<<<columns>>>);
END_OF_SQL
end

#insert_access_creation_record_sql ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 956

def insert_access_creation_record_sql
  name_literal = MSSQLSpecifics.string_literal(quoted_name)
  
  <<-"END_OF_SQL"
INSERT INTO [xmigra].[access_objects] ([type], [name])
VALUES (N'#{self.class::OBJECT_TYPE}', #{name_literal});
  END_OF_SQL
end

#migration_application_sql ⇒ Object

Call on an extended Migration object to get the SQL to execute.



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# File 'lib/xmigra/db_support/mssql.rb', line 966

def migration_application_sql
  id_literal = MSSQLSpecifics.string_literal(id)
  template = <<-"END_OF_SQL"
IF EXISTS (
  SELECT * FROM [xmigra].[migrations]
  WHERE [MigrationID] = #{id_literal}
  AND [Install] <> 0
)
BEGIN
  PRINT #{MSSQLSpecifics.string_literal('Applying "' + File.basename(file_path) + '":')};
  
%s

  INSERT INTO [xmigra].[applied] ([MigrationID], [Description])
  VALUES (#{id_literal}, #{MSSQLSpecifics.string_literal(description)});
END;
  END_OF_SQL
  
  parts = []
  
  each_batch(sql) do |batch|
    parts << batch
  end
  
  return (template % parts.collect do |batch|
    "EXEC sp_executesql @statement = " + MSSQLSpecifics.string_literal(batch) + ";"
  end.join("\n"))
end

#name_parts ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 1034

def name_parts
  if m = DBNAME_PATTERN.match(name)
    [m[1], m[2]].compact.collect do |p|
      MSSQLSpecifics.strip_identifier_quoting(p)
    end
  else
    raise XMigra::Error, "Invalid database object name"
  end
end

#object_type_codes ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 1050

def object_type_codes
  MSSQLSpecifics.object_type_codes(self)
end

#procedure_definition_template_sql ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 1170

def procedure_definition_template_sql
  <<-"END_OF_SQL"
CREATE PROCEDURE [{filename}]
  <<<parameters>>>
AS BEGIN
  <<<statements>>>
END
END_OF_SQL
end

#production_config_check_sql ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 585

def production_config_check_sql
  unless production
    id_literal = MSSQLSpecifics.string_literal(@migrations[0].id)
    <<-"END_OF_SQL"
PRINT N'Checking for production status:';
IF EXISTS (
  SELECT * FROM [xmigra].[migrations]
  WHERE [MigrationID] = #{id_literal}
  AND [Install] <> 0
)
BEGIN
  CREATE TABLE [xmigra].[development] (
[info] nvarchar(200) NOT NULL PRIMARY KEY
  );
END;
GO

IF NOT EXISTS (
  SELECT * FROM [sys].[objects]
  WHERE object_id = OBJECT_ID(N'[xmigra].[development]')
  AND type = N'U'
)
RAISERROR(N'Development script cannot be applied to a production database.', 11, 1);
    END_OF_SQL
  end
end

#quoted_name ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 1044

def quoted_name
  name_parts.collect do |p|
    "[]".insert(1, p)
  end.join('.')
end

#remove_access_artifacts_sql ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 612

def remove_access_artifacts_sql
  # Iterate the [xmigra].[access_objects] table and drop all access
  # objects previously created by xmigra
  return <<-"END_OF_SQL"
PRINT N'Removing data access artifacts:';
DECLARE @sqlcmd NVARCHAR(1000); -- Built SQL command
DECLARE @obj_name NVARCHAR(256); -- Name of object to drop
DECLARE @obj_type NVARCHAR(40); -- Type of object to drop

DECLARE AccObjs_cursor CURSOR LOCAL FOR
SELECT [name], [type]
FROM [xmigra].[access_objects]
ORDER BY [order] DESC;

OPEN AccObjs_cursor;

FETCH NEXT FROM AccObjs_cursor INTO @obj_name, @obj_type;

WHILE @@FETCH_STATUS = 0 BEGIN
  SET @sqlcmd = N'DROP ' + @obj_type + N' ' + @obj_name + N';';
  EXEC sp_executesql @sqlcmd;
  
  FETCH NEXT FROM AccObjs_cursor INTO @obj_name, @obj_type;
END;

CLOSE AccObjs_cursor;
DEALLOCATE AccObjs_cursor;

DELETE FROM [xmigra].[access_objects];

END_OF_SQL
end

#remove_undesired_indexes_sql ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 645

def remove_undesired_indexes_sql
  <<-"END_OF_SQL"
PRINT N'Removing undesired indexes:';
-- Iterate over indexes in [xmigra].[indexes] that don't have an entry in
-- [xmigra].[updated_indexes].
DECLARE @sqlcmd NVARCHAR(1000); -- Built SQL command
DECLARE @index_name NVARCHAR(256); -- Name of index to drop
DECLARE @table_name SYSNAME; -- Name of table owning index
DECLARE @match_count INT; -- Number of matching index names

DECLARE Index_cursor CURSOR LOCAL FOR
SELECT 
  xi.[name], 
  MAX(QUOTENAME(OBJECT_SCHEMA_NAME(si.object_id)) + N'.' + QUOTENAME(OBJECT_NAME(si.object_id))), 
  COUNT(*)
FROM [xmigra].[indexes] xi
INNER JOIN sys.indexes si ON si.[name] = xi.[name]
WHERE xi.[IndexID] NOT IN (
  SELECT [IndexID]
  FROM [xmigra].[updated_indexes]
)
GROUP BY xi.[name];

OPEN Index_cursor;

FETCH NEXT FROM Index_cursor INTO @index_name, @table_name, @match_count;

WHILE @@FETCH_STATUS = 0 BEGIN
  IF @match_count > 1
  BEGIN
RAISERROR(N'Multiple indexes are named %s', 11, 1, @index_name);
  END;
  
  SET @sqlcmd = N'DROP INDEX ' + @index_name + N' ON ' + @table_name + N';';
  EXEC sp_executesql @sqlcmd;
  PRINT N'    Removed ' + @index_name + N'.';
  
  FETCH NEXT FROM Index_cursor INTO @index_name, @table_name, @match_count;
END;

CLOSE Index_cursor;
DEALLOCATE Index_cursor;

DELETE FROM [xmigra].[indexes]
WHERE [IndexID] NOT IN (
  SELECT ui.[IndexID]
  FROM [xmigra].[updated_indexes] ui
);
  END_OF_SQL
end

#remove_undesired_statistics_sql ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 696

def remove_undesired_statistics_sql
  <<-"END_OF_SQL"
PRINT N'Removing undesired statistics objects:';
-- Iterate over statistics in [xmigra].[statistics] that don't have an entry in
-- [xmigra].[updated_statistics].
DECLARE @sqlcmd NVARCHAR(1000); -- Built SQL command
DECLARE @statsobj_name NVARCHAR(256); -- Name of statistics object to drop
DECLARE @table_name SYSNAME; -- Name of table owning the statistics object
DECLARE @match_count INT; -- Number of matching statistics object names

DECLARE Stats_cursor CURSOR LOCAL FOR
SELECT 
  QUOTENAME(xs.[Name]), 
  MAX(QUOTENAME(OBJECT_SCHEMA_NAME(ss.object_id)) + N'.' + QUOTENAME(OBJECT_NAME(ss.object_id))), 
  COUNT(ss.object_id)
FROM [xmigra].[statistics] xs
INNER JOIN sys.stats ss ON ss.[name] = xs.[Name]
WHERE xs.[Columns] NOT IN (
  SELECT us.[Columns]
  FROM [xmigra].[updated_statistics] us
  WHERE us.[Name] = xs.[Name]
)
GROUP BY xs.[Name];

OPEN Stats_cursor;

FETCH NEXT FROM Stats_cursor INTO @statsobj_name, @table_name, @match_count;

WHILE @@FETCH_STATUS = 0 BEGIN
  IF @match_count > 1
  BEGIN
RAISERROR(N'Multiple indexes are named %s', 11, 1, @statsobj_name);
  END;
  
  SET @sqlcmd = N'DROP STATISTICS ' + @table_name + N'.' + @statsobj_name + N';';
  EXEC sp_executesql @sqlcmd;
  PRINT N'    Removed statistics object ' + @statsobj_name + N'.'
  
  FETCH NEXT FROM Stats_cursor INTO @statsobj_name, @table_name, @match_count;
END;

CLOSE Stats_cursor;
DEALLOCATE Stats_cursor;

DELETE FROM [xmigra].[statistics]
WHERE [Columns] NOT IN (
  SELECT us.[Columns]
  FROM [xmigra].[updated_statistics] us
  WHERE us.[Name] = [Name]
);
  END_OF_SQL
end

#reversion_tracking_sql ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 995

def reversion_tracking_sql
  "DELETE FROM [xmigra].[applied] WHERE [MigrationID] = '#{id}';\n"
end

#revoke_previous_permissions_sql ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 895

def revoke_previous_permissions_sql
  <<-"END_OF_SQL"

-- ------------- REVOKING PREVIOUSLY GRANTED PERMISSIONS ------------- --

PRINT N'Revoking previously granted permissions:';
-- Iterate over permissions listed in [xmigra].[revokable_permissions]
DECLARE @sqlcmd NVARCHAR(1000); -- Built SQL command
DECLARE @permissions NVARCHAR(200); 
DECLARE @object NVARCHAR(260); 
DECLARE @principal NVARCHAR(150);

DECLARE Permission_cursor CURSOR LOCAL FOR
SELECT
  xp.[permissions],
  xp.[object],
  QUOTENAME(sdp.name)
FROM [xmigra].[revokable_permissions] xp
INNER JOIN sys.database_principals sdp ON xp.principal_id = sdp.principal_id;

OPEN Permission_cursor;

FETCH NEXT FROM Permission_cursor INTO @permissions, @object, @principal;

WHILE @@FETCH_STATUS = 0 BEGIN
  SET @sqlcmd = N'REVOKE ' + @permissions + N' ON ' + @object + ' FROM ' + @principal + N';';
  BEGIN TRY
EXEC sp_executesql @sqlcmd;
  END TRY
  BEGIN CATCH
  END CATCH
  
  FETCH NEXT FROM Permission_cursor INTO @permissions, @object, @principal;
END;

CLOSE Permission_cursor;
DEALLOCATE Permission_cursor;

DELETE FROM [xmigra].[revokable_permissions];
  END_OF_SQL
end

#select_for_install_sql ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 515

def select_for_install_sql
  <<-"END_OF_SQL"
PRINT N'Selecting migrations to apply:';
DECLARE @BridgePoint INT;
IF #{upgrading_to_new_branch_test_sql}
BEGIN
  -- Get the [xmigra].[migrations] ApplicationOrder of the record corresponding to the branch transition
  SET @BridgePoint = (
SELECT MAX(m.[ApplicationOrder])
FROM [xmigra].[migrations] m
INNER JOIN [xmigra].[branch_upgrade] bu
  ON m.[MigrationID] = bu.[CompletesMigration]
  );
  
  UPDATE [xmigra].[migrations]
  SET [Install] = 1
  WHERE [ApplicationOrder] > @BridgePoint;
END
ELSE BEGIN
  -- Get the [xmigra].[migrations] ApplicationOrder of the most recent version bridge migration
  SET @BridgePoint = (
SELECT COALESCE(MAX(m.[ApplicationOrder]), 0)
FROM [xmigra].[applied] a
INNER JOIN [xmigra].[migrations] m
  ON a.[MigrationID] = m.[MigrationID]
WHERE a.[VersionBridgeMark] <> 0
  );
  
  UPDATE [xmigra].[migrations]
  SET [Install] = 1
  WHERE [MigrationID] NOT IN (
SELECT a.[MigrationID] FROM [xmigra].[applied] a
  )
  AND [ApplicationOrder] > @BridgePoint;
END;

INSERT INTO [xmigra].[previous_states] (
  [Changed],
  [MigrationApplicationOrder],
  [FromMigrationID],
  [ToRangeStartMigrationID],
  [ToRangeEndMigrationID]
)
SELECT TOP (1)
  CURRENT_TIMESTAMP,
  -- Application order of last installed migration --
  COALESCE(
( 
  SELECT TOP(1) [ApplicationOrder] FROM [xmigra].[applied]
  ORDER BY [ApplicationOrder] DESC
),
0
  ),
  ( -- Last installed migration --
SELECT TOP (1) [MigrationID]
FROM [xmigra].[applied]
ORDER BY [ApplicationOrder] DESC
  ),
  m.[MigrationID],
  ( -- Last migration to install --
SELECT TOP(1) [MigrationID] FROM [xmigra].[migrations]
WHERE [Install] <> 0
ORDER BY [ApplicationOrder] DESC
  )
FROM [xmigra].[migrations] m
WHERE m.[Install] <> 0
ORDER BY m.[ApplicationOrder] ASC;
  END_OF_SQL
end

#stats_objs ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 44

def stats_objs
  return @stats_objs if @stats_objs
  
  begin
    stats_data = YAML::load_file(path.join(MSSQLSpecifics::STATISTICS_FILE))
  rescue Errno::ENOENT
    return @stats_objs = [].freeze
  end
  
  @stats_objs = stats_data.collect {|item| StatisticsObject.new(*item)}
  @stats_objs.each {|o| o.freeze}
  @stats_objs.freeze
  
  return @stats_objs
end

#upgrade_cleanup_sql ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 831

def upgrade_cleanup_sql
  <<-"END_OF_SQL"
PRINT N'Cleaning up from the upgrade:';
DROP TABLE [xmigra].[migrations];
DROP TABLE [xmigra].[updated_indexes];
DROP TABLE [xmigra].[updated_statistics];
  END_OF_SQL
end

#upgrading_to_new_branch_test_sql ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 1070

def upgrading_to_new_branch_test_sql
  return "(0 = 1)" unless respond_to? :branch_identifier
  
  (<<-"END_OF_SQL").chomp
(EXISTS (
  SELECT TOP(1) * FROM [xmigra].[branch_upgrade]
  WHERE [Next] = #{branch_id_literal}
))
  END_OF_SQL
end

#view_definition_template_sql ⇒ Object 



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# File 'lib/xmigra/db_support/mssql.rb', line 1163

def view_definition_template_sql
  <<-"END_OF_SQL"
CREATE VIEW [{filename}]
AS SELECT <<<query>>>;
END_OF_SQL
end