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 = ["IF \#{upgrading_to_new_branch_test_sql}\nBEGIN\n  PRINT N'Migrating from previous schema branch:';\n  \n  DECLARE @sqlcmd NVARCHAR(MAX);\n  \n  DECLARE CmdCursor CURSOR LOCAL FOR\n  SELECT bu.[UpgradeSql]\n  FROM [xmigra].[branch_upgrade] bu\n  WHERE bu.[Next] = \#{branch_id_literal}\n  ORDER BY bu.[ApplicationOrder] ASC;\n  \n  OPEN CmdCursor;\n  \n  FETCH NEXT FROM CmdCursor INTO @sqlcmd;\n  \n  WHILE @@FETCH_STATUS = 0 BEGIN\nEXECUTE sp_executesql @sqlcmd;\n\nFETCH NEXT FROM CmdCursor INTO @sqlcmd;\n  END;\n  \n  CLOSE CmdCursor;\n  DEALLOCATE CmdCursor;\n  \n  DECLARE @applied NVARCHAR(80);\n  DECLARE @old_branch NVARCHAR(80);\n  \n  SELECT TOP(1) @applied = [CompletesMigration], @old_branch = [Current]\n  FROM [xmigra].[branch_upgrade]\n  WHERE [Next] = \#{branch_id_literal};\n  \n  -- Delete the \"applied\" record for the migration if there was one, so that\n  -- a new record with this ID can be inserted.\n  DELETE FROM [xmigra].[applied] WHERE [MigrationID] = @applied;\n  \n  -- Create a \"version bridge\" record in the \"applied\" table for the branch upgrade\n  INSERT INTO [xmigra].[applied] ([MigrationID], [VersionBridgeMark], [Description])\n  VALUES (@applied, 1, N'Branch upgrade from branch ' + @old_branch);\nEND;\n\nDELETE FROM [xmigra].[branch_upgrade];\n\n  END_OF_SQL\n  \n  if branch_upgrade.applicable? migrations\n    batch_template = <<-\"END_OF_SQL\"\nINSERT INTO [xmigra].[branch_upgrade]\n([Current], [Next], [CompletesMigration], [UpgradeSql])\nVALUES (\n  \#{branch_id_literal},\n  \#{MSSQLSpecifics.string_literal(branch_upgrade.target_branch)},\n  \#{MSSQLSpecifics.string_literal(branch_upgrade.migration_completed_id)},\n  %s\n);\n    END_OF_SQL\n    \n    each_batch(branch_upgrade.sql) do |batch|\n      # Insert the batch into the [xmigra].[branch_upgrade] table\n      parts << (batch_template % MSSQLSpecifics.string_literal(batch))\n    end\n  else\n    # Insert a placeholder that only declares the current branch of the schema\n    parts << <<-\"END_OF_SQL\"\nINSERT INTO [xmigra].[branch_upgrade] ([Current]) VALUES (\#{branch_id_literal});\n    END_OF_SQL\n  end\n  \n  return parts.join(\"\\n\")\nend\n"]

#check_chain_continuity_sql ⇒ Object 



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

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

#check_execution_environment_sql ⇒ Object 



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

def check_execution_environment_sql
  "PRINT N'Checking execution environment:';\nIF DB_NAME() IN ('master', 'tempdb', 'model', 'msdb')\nBEGIN\n  RAISERROR(N'Please select an appropriate target database for the update script.', 11, 1);\nEND;\n  END_OF_SQL\nend\n"

#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 "\nIF \#{\"NOT\" if for_existence} \#{existence_test_sql}\nRAISERROR(N'\#{error_message}', 11, 1);\n  END_OF_SQL\nend\n"

#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 << ("IF EXISTS (\n  SELECT TOP(1) * FROM [xmigra].[branch_upgrade]\n) AND NOT EXISTS (\n  SELECT TOP(1) * FROM [xmigra].[branch_upgrade]\n  WHERE \#{branch_id_literal} IN ([Current], [Next])\n)\nRAISERROR (N'Existing database is from a different (and non-upgradable) branch.', 11, 1);\n\n  END_OF_SQL\n  \n  parts << (<<-\"END_OF_SQL\")\nIF NOT \#{upgrading_to_new_branch_test_sql}\nBEGIN\n  PRINT N'Checking preceding migrations:';\n  -- Get the ApplicationOrder of the most recent version bridge migration\n  DECLARE @VersionBridge INT;\n  SET @VersionBridge = (\nSELECT COALESCE(MAX([ApplicationOrder]), 0)\nFROM [xmigra].[applied]\nWHERE [VersionBridgeMark] <> 0\n  );\n  \n  -- Check for existence of applied migrations after the latest version\n  -- bridge that are not in [xmigra].[migrations]\n  IF EXISTS (\nSELECT * FROM [xmigra].[applied] a\nWHERE a.[ApplicationOrder] > @VersionBridge\nAND a.[MigrationID] NOT IN (\n  SELECT m.[MigrationID] FROM [xmigra].[migrations] m\n)\n  )\n  RAISERROR (N'Unknown in-branch migrations have been applied.', 11, 1);\nEND;\n  END_OF_SQL\n  \n  return parts.join('')\nend\n") if production

#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 = "PRINT N'Creating and filling index manipulation table:';\nIF EXISTS (\n  SELECT * FROM sys.objects\n  WHERE object_id = OBJECT_ID(N'[xmigra].[updated_indexes]')\n  AND type IN (N'U')\n)\nBEGIN\n  DROP TABLE [xmigra].[updated_indexes];\nEND;\nGO\n\nCREATE TABLE [xmigra].[updated_indexes] (\n  [IndexID]                  NVARCHAR(80) NOT NULL PRIMARY KEY\n);\nGO\n\n  END_OF_SQL\n  \n  insertion = <<-\"END_OF_SQL\"\nINSERT INTO [xmigra].[updated_indexes] ([IndexID]) VALUES\n  END_OF_SQL\n  \n  strlit = MSSQLSpecifics.method :string_literal\n  return intro + (insertion + indexes.collect do |index|\n    \"(\#{strlit[index.id]})\"\n  end.join(\",\\n\") + \";\\n\" unless indexes.empty?).to_s\nend\n"

#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 = "IF EXISTS (\n  SELECT * FROM sys.objects\n  WHERE object_id = OBJECT_ID(N'[xmigra].[migrations]')\n  AND type IN (N'U')\n)\nBEGIN\n  DROP TABLE [xmigra].[migrations];\nEND;\nGO\n\nCREATE TABLE [xmigra].[migrations] (\n  [MigrationID]            nvarchar(80) COLLATE \#{ID_COLLATION} NOT NULL,\n  [ApplicationOrder]       int NOT NULL,\n  [Description]            ntext NOT NULL,\n  [Install]                bit NOT NULL DEFAULT(0)\n);\nGO\n\n  END_OF_SQL\n  \n  mig_insert = <<-\"END_OF_SQL\"\nINSERT INTO [xmigra].[migrations] (\n  [MigrationID],\n  [ApplicationOrder],\n  [Description]\n) VALUES\n  END_OF_SQL\n  \n  if (@db_info || {}).fetch('MSSQL 2005 compatible', false).eql?(true)\n    parts = [intro]\n    (0...migrations.length).each do |i|\n      m = migrations[i]\n      description_literal = MSSQLSpecifics.string_literal(m.description.strip)\n      parts << mig_insert + \"(N'\#{m.id}', \#{i + 1}, \#{description_literal});\\n\"\n    end\n    return parts.join('')\n  else\n    return intro + mig_insert + (0...migrations.length).collect do |i|\n      m = migrations[i]\n      description_literal = MSSQLSpecifics.string_literal(m.description.strip)\n      \"(N'\#{m.id}', \#{i + 1}, \#{description_literal})\"\n    end.join(\",\\n\") + \";\\n\"\n  end\nend\n"

#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 = "PRINT N'Creating and filling statistics object manipulation table:';\nIF EXISTS (\n  SELECT * FROM sys.objects\n  WHERE object_id = OBJECT_ID(N'[xmigra].[updated_statistics]')\n  AND type in (N'U')\n)\nBEGIN\n  DROP TABLE [xmigra].[updated_statistics];\nEND;\nGO\n\nCREATE TABLE [xmigra].[updated_statistics] (\n  [Name] nvarchar(100) NOT NULL PRIMARY KEY,\n  [Columns] nvarchar(256) NOT NULL\n);\nGO\n\n  END_OF_SQL\n  \n  insertion = <<-\"END_OF_SQL\"\nINSERT INTO [xmigra].[updated_statistics] ([Name], [Columns]) VALUES\n  END_OF_SQL\n  \n  strlit = MSSQLSpecifics.method :string_literal\n  return intro + (insertion + stats_objs.collect do |stats_obj|\n    \"(\#{strlit[stats_obj.name]}, \#{strlit[stats_obj.columns]})\"\n  end.join(\",\\n\") + \";\\n\" unless stats_objs.empty?).to_s\nend\n"

#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)
    "PRINT N'Index ' + \#{index_id_literal} + ':';\nIF EXISTS(\n  SELECT * FROM [xmigra].[updated_indexes] ui\n  WHERE ui.[IndexID] = \#{index_id_literal}\n  AND ui.[IndexID] NOT IN (\nSELECT i.[IndexID] FROM [xmigra].[indexes] i\n  )\n)\nBEGIN\n  IF EXISTS (\nSELECT * FROM sys.indexes\nWHERE [name] = \#{index_name_literal}\n  )\n  BEGIN\nRAISERROR(N'An index already exists named %s', 11, 1, \#{index_name_literal});\n  END;\n  \n  PRINT N'    Creating...';\n  \#{index.definition_sql};\n  \n  IF (SELECT COUNT(*) FROM sys.indexes WHERE [name] = \#{index_name_literal}) <> 1\n  BEGIN\nRAISERROR(N'Index %s was not created by its definition.', 11, 1,\n  \#{index_name_literal});\n  END;\n\n  INSERT INTO [xmigra].[indexes] ([IndexID], [name])\n  VALUES (\#{index_id_literal}, \#{index_name_literal});\nEND\nELSE\nBEGIN\n  PRINT N'    Already exists.';\nEND;\n    END_OF_SQL\n  end.join(ddl_block_separator)\nend\n"

#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
    "PRINT N'Statistics object \#{stats_obj.name}:';\nIF EXISTS (\n  SELECT * FROM [xmigra].[updated_statistics] us\n  WHERE us.[Name] = \#{stats_name}\n  AND us.[Columns] NOT IN (\nSELECT s.[Columns]\nFROM [xmigra].[statistics] s\nWHERE s.[Name] = us.[Name]\n  )\n)\nBEGIN\n  IF EXISTS (\nSELECT * FROM sys.stats\nWHERE [name] = \#{stats_name}\n  )\n  BEGIN\nRAISERROR(N'A statistics object named %s already exists.', 11, 1, \#{stats_name})\n  END;\n  \n  PRINT N'    Creating...';\n  \#{stats_obj.creation_sql}\n  \n  INSERT INTO [xmigra].[statistics] ([Name], [Columns])\n  VALUES (\#{stats_name}, \#{strlit[stats_obj.columns]})\nEND\nELSE\nBEGIN\n  PRINT N'    Already exists.';\nEND;\n    END_OF_SQL\n  end.join(ddl_block_separator)\nend\n"

#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)
  "-- ------------ SET UP XMIGRA PERMISSION TRACKING OBJECTS ------------ --\n\nPRINT N'Setting up XMigra permission tracking:';\nIF NOT EXISTS (\n  SELECT * FROM sys.schemas\n  WHERE name = N'xmigra'\n)\nBEGIN\n  EXEC sp_executesql N'\nCREATE SCHEMA [xmigra] AUTHORIZATION [dbo];\n  ';\nEND;\nGO\n\nIF NOT EXISTS(\n  SELECT * FROM sys.objects\n  WHERE object_id = OBJECT_ID(N'[xmigra].[revokable_permissions]')\n  AND type IN (N'U')\n)\nBEGIN\n  CREATE TABLE [xmigra].[revokable_permissions] (\n[permissions] nvarchar(200) NOT NULL,\n[object] nvarchar(260) NOT NULL,\n[principal_id] int NOT NULL\n  ) ON [PRIMARY];\nEND;\nGO\n\nIF EXISTS(\n  SELECT * FROM sys.objects\n  WHERE object_id = OBJECT_ID(N'[xmigra].[ip_prepare_revoke]')\n  AND type IN (N'P', N'PC')\n)\nBEGIN\n  DROP PROCEDURE [xmigra].[ip_prepare_revoke];\nEND;\nGO\n\nCREATE PROCEDURE [xmigra].[ip_prepare_revoke]\n(\n  @permissions nvarchar(200),\n  @object nvarchar(260),\n  @principal sysname\n)\nAS\nBEGIN\n  INSERT INTO [xmigra].[revokable_permissions] ([permissions], [object], [principal_id])\n  VALUES (@permissions, @object, DATABASE_PRINCIPAL_ID(@principal));\nEND;\n  END_OF_SQL\nend\n"

#ensure_version_tables_sql ⇒ Object 



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

def ensure_version_tables_sql
  "PRINT N'Ensuring version tables:';\nIF NOT EXISTS (\n  SELECT * FROM sys.schemas\n  WHERE name = N'xmigra'\n)\nBEGIN\n  EXEC sp_executesql N'\nCREATE SCHEMA [xmigra] AUTHORIZATION [dbo];\n  ';\nEND;\nGO\n\nIF NOT EXISTS (\n  SELECT * FROM sys.objects\n  WHERE object_id = OBJECT_ID(N'[xmigra].[applied]')\n  AND type IN (N'U')\n)\nBEGIN\n  CREATE TABLE [xmigra].[applied] (\n[MigrationID]            nvarchar(80) COLLATE \#{ID_COLLATION} NOT NULL,\n[ApplicationOrder]       int IDENTITY(1,1) NOT NULL,\n[VersionBridgeMark]      bit NOT NULL,\n[Description]            nvarchar(max) NOT NULL,\n\nCONSTRAINT [PK_version] PRIMARY KEY CLUSTERED (\n  [MigrationID] ASC\n) WITH (\n  PAD_INDEX = OFF,\n  STATISTICS_NORECOMPUTE  = OFF,\n  IGNORE_DUP_KEY = OFF,\n  ALLOW_ROW_LOCKS = ON,\n  ALLOW_PAGE_LOCKS = ON\n) ON [PRIMARY]\n  ) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY];\nEND;\nGO\n\nIF NOT EXISTS (\n  SELECT * FROM sys.columns\n  WHERE object_id = OBJECT_ID(N'[xmigra].[applied]')\n  AND name = N'MigrationID'\n  AND collation_name = N'\#{ID_COLLATION}'\n)\nBEGIN\n  ALTER TABLE xmigra.applied DROP CONSTRAINT PK_version;\n  ALTER TABLE xmigra.applied ALTER COLUMN [MigrationID] nvarchar(80) COLLATE Latin1_General_CS_AS NOT NULL;\n  ALTER TABLE xmigra.applied ADD CONSTRAINT PK_version PRIMARY KEY ([MigrationID] ASC) WITH (\nPAD_INDEX = OFF,\nSTATISTICS_NORECOMPUTE  = OFF,\nIGNORE_DUP_KEY = OFF,\nALLOW_ROW_LOCKS = ON,\nALLOW_PAGE_LOCKS = ON\n  ) ON [PRIMARY];\nEND;\n\nIF NOT EXISTS (\n  SELECT * FROM sys.objects\n  WHERE object_id = OBJECT_ID(N'[xmigra].[previous_states]')\n  AND type IN (N'U')\n)\nBEGIN\n  CREATE TABLE [xmigra].[previous_states] (\n[Changed]                   datetime NOT NULL,\n[MigrationApplicationOrder] int NOT NULL,\n[FromMigrationID]           nvarchar(80) COLLATE \#{ID_COLLATION},\n[ToRangeStartMigrationID]   nvarchar(80) COLLATE \#{ID_COLLATION} NOT NULL,\n[ToRangeEndMigrationID]     nvarchar(80) COLLATE \#{ID_COLLATION} NOT NULL,\n\nCONSTRAINT [PK_previous_states] PRIMARY KEY CLUSTERED (\n  [Changed] ASC,\n  [MigrationApplicationOrder] ASC\n)\n  );\nEND;\nGO\n\nIF NOT EXISTS (\n  SELECT * FROM sys.objects\n  WHERE object_id = OBJECT_ID(N'[xmigra].[DF_version_VersionBridgeMark]')\n  AND type IN (N'D')\n)\nBEGIN\n  ALTER TABLE [xmigra].[applied] ADD CONSTRAINT [DF_version_VersionBridgeMark]\nDEFAULT (0) FOR [VersionBridgeMark];\nEND;\nGO\n\nIF NOT EXISTS (\n  SELECT * FROM sys.objects\n  WHERE object_id = OBJECT_ID(N'[xmigra].[access_objects]')\n  AND type IN (N'U')\n)\nBEGIN\n  CREATE TABLE [xmigra].[access_objects] (\n[type] nvarchar(40) NOT NULL,\n[name] nvarchar(256) NOT NULL,\n[order] int identity(1,1) NOT NULL,\n\nCONSTRAINT [PK_access_objects] PRIMARY KEY CLUSTERED (\n  [name] ASC\n) WITH (\n  PAD_INDEX = OFF,\n  STATISTICS_NORECOMPUTE  = OFF,\n  IGNORE_DUP_KEY = OFF,\n  ALLOW_ROW_LOCKS = ON,\n  ALLOW_PAGE_LOCKS = ON\n) ON [PRIMARY]\n  ) ON [PRIMARY];\nEND;\nGO\n\nIF NOT EXISTS (\n  SELECT * FROM sys.objects\n  WHERE object_id = OBJECT_ID(N'[xmigra].[indexes]')\n  AND type in (N'U')\n)\nBEGIN\n  CREATE TABLE [xmigra].[indexes] (\n[IndexID] nvarchar(80) NOT NULL PRIMARY KEY,\n[name] nvarchar(256) NOT NULL\n  ) ON [PRIMARY];\nEND;\n\nIF NOT EXISTS (\n  SELECT * FROM sys.objects\n  WHERE object_id = OBJECT_ID(N'[xmigra].[statistics]')\n  AND type in (N'U')\n)\nBEGIN\n  CREATE TABLE [xmigra].[statistics] (\n[Name] nvarchar(100) NOT NULL PRIMARY KEY,\n[Columns] nvarchar(256) NOT NULL\n  ) ON [PRIMARY];\nEND;\n\nIF NOT EXISTS (\n  SELECT * FROM sys.objects\n  WHERE object_id = OBJECT_ID(N'[xmigra].[branch_upgrade]')\n  AND type in (N'U')\n)\nBEGIN\n  CREATE TABLE [xmigra].[branch_upgrade] (\n[ApplicationOrder] int identity(1,1) NOT NULL,\n[Current] nvarchar(80) COLLATE \#{ID_COLLATION} NOT NULL PRIMARY KEY,\n[Next] nvarchar(80) COLLATE \#{ID_COLLATION} NULL,\n[UpgradeSql] nvarchar(max) NULL,\n[CompletesMigration] nvarchar(80) COLLATE \#{ID_COLLATION} NULL\n  ) ON [PRIMARY];\nEND;\nGO\nALTER TABLE [xmigra].[branch_upgrade] ALTER COLUMN [CompletesMigration] nvarchar(80) COLLATE \#{ID_COLLATION} NULL;\n\nIF EXISTS (\n  SELECT * FROM sys.objects\n  WHERE object_id = OBJECT_ID(N'[xmigra].[last_applied_migrations]')\n  AND type IN (N'V')\n)\nBEGIN\n  DROP VIEW [xmigra].[last_applied_migrations];\nEND;\nGO\n\nCREATE VIEW [xmigra].[last_applied_migrations] AS\nSELECT\n  ROW_NUMBER() OVER (ORDER BY a.[ApplicationOrder] DESC) AS [RevertOrder],\n  a.[Description]\nFROM\n  [xmigra].[applied] a\nWHERE\n  a.[ApplicationOrder] > COALESCE((\nSELECT TOP (1) ps.[MigrationApplicationOrder]\nFROM [xmigra].[previous_states] ps\nJOIN [xmigra].[applied] a2 ON ps.[ToRangeStartMigrationID] = a2.[MigrationID]\nORDER BY ps.[Changed] DESC\n  ), 0);\n  END_OF_SQL\nend\n"

#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 "EXISTS (\n  SELECT * FROM sys.objects\n  WHERE object_id = OBJECT_ID(N'\#{quoted_name}')\n  AND type IN (\#{object_type_list})\n)\n  END_OF_SQL\nend\n"

#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
  "CREATE FUNCTION [{filename}] (\n  <<<parameters>>>\n) RETURNS <<<return-type>>>\nAS BEGIN\n  <<<statements>>>\n  RETURN <<<return-value-expression>>>;\nEND\n"
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(', ')
  
  "PRINT N'Granting \#{permissions_string} on \#{object} to \#{principal}:';\nGRANT \#{permissions_string} ON \#{object} TO \#{principal};\nEXEC [xmigra].[ip_prepare_revoke] \#{strlit[permissions_string]}, \#{strlit[object]}, \#{strlit[principal]};\n  END_OF_SQL\nend\n"

#granting_permissions_comment_sql ⇒ Object 



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

def granting_permissions_comment_sql
  "  \n-- ---------------------- GRANTING PERMISSIONS ----------------------- --\n\n  END_OF_SQL\nend\n"

#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 << "SET ANSI_NULLS ON\nGO\n\nSET QUOTED_IDENTIFIER ON\nGO\n\nSET ANSI_PADDING ON\nGO\n\nSET NOCOUNT ON\nGO\n-------------------- ERROR REFERENCE LINE --------------------\nDECLARE @BATCH_START_OFFSET INTEGER; SET @BATCH_START_OFFSET = 0;\nBEGIN TRY\n  BEGIN TRAN;\n  END_OF_SQL\n  \n  offset_lines = 5\n  each_batch(yield) do |batch|\n    batch_literal = MSSQLSpecifics.string_literal(\"\\n\" + batch)\n    parts << \"SET @BATCH_START_OFFSET = \#{offset_lines}; EXEC sp_executesql @statement = \#{batch_literal}; SET @BATCH_START_OFFSET = 0;\"\n    offset_lines += parts[-1].count(\"\\n\") + 1\n  end\n  \n  if options[:dry_run]\n    parts << \"  PRINT N'Dry-run successful.  Rolling back changes.'; ROLLBACK TRAN;\"\n  else\n    parts << \"  COMMIT TRAN;\"\n  end\n  parts << <<-\"END_OF_SQL\"\nEND TRY\nBEGIN CATCH\n  ROLLBACK TRAN;\n  \n  DECLARE @ErrorMessage NVARCHAR(4000);\n  DECLARE @ErrorSeverity INT;\n  DECLARE @ErrorState INT;\n  \n  PRINT N'Update failed: ' + ERROR_MESSAGE();\n  PRINT N'    State: ' + CAST(ERROR_STATE() AS NVARCHAR);\n  PRINT N'    Line: ' + CAST(@BATCH_START_OFFSET + ERROR_LINE() - 1 AS NVARCHAR) + N' after ERROR REFERENCE LINE'\n\n  SELECT \n  @ErrorMessage = N'Update failed: ' + ERROR_MESSAGE(),\n  @ErrorSeverity = ERROR_SEVERITY(),\n  @ErrorState = ERROR_STATE();\n\n  -- Use RAISERROR inside the CATCH block to return error\n  -- information about the original error that caused\n  -- execution to jump to the CATCH block.\n  RAISERROR (@ErrorMessage, -- Message text.\n         @ErrorSeverity, -- Severity.\n         @ErrorState -- State.\n         );\nEND CATCH;\n  END_OF_SQL\n  \n  return parts.join(\"\\n\")\nend\n"

#index_template_sql ⇒ Object 



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

def index_template_sql
  "CREATE INDEX [{filename}]\nON <<<table>>> (<<<columns>>>);\n"
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)
  
  "INSERT INTO [xmigra].[access_objects] ([type], [name])\nVALUES (N'\#{self.class::OBJECT_TYPE}', \#{name_literal});\n  END_OF_SQL\nend\n"

#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 = "IF EXISTS (\n  SELECT * FROM [xmigra].[migrations]\n  WHERE [MigrationID] = \#{id_literal}\n  AND [Install] <> 0\n)\nBEGIN\n  PRINT \#{MSSQLSpecifics.string_literal('Applying \"' + File.basename(file_path) + '\":')};\n  \n%s\n\n  INSERT INTO [xmigra].[applied] ([MigrationID], [Description])\n  VALUES (\#{id_literal}, \#{MSSQLSpecifics.string_literal(description)});\nEND;\n  END_OF_SQL\n  \n  parts = []\n  \n  each_batch(sql) do |batch|\n    parts << batch\n  end\n  \n  return (template % parts.collect do |batch|\n    \"EXEC sp_executesql @statement = \" + MSSQLSpecifics.string_literal(batch) + \";\"\n  end.join(\"\\n\"))\nend\n"

#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
  "CREATE PROCEDURE [{filename}]\n  <<<parameters>>>\nAS BEGIN\n  <<<statements>>>\nEND\n"
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)
    "PRINT N'Checking for production status:';\nIF EXISTS (\n  SELECT * FROM [xmigra].[migrations]\n  WHERE [MigrationID] = \#{id_literal}\n  AND [Install] <> 0\n)\nBEGIN\n  CREATE TABLE [xmigra].[development] (\n[info] nvarchar(200) NOT NULL PRIMARY KEY\n  );\nEND;\nGO\n\nIF NOT EXISTS (\n  SELECT * FROM [sys].[objects]\n  WHERE object_id = OBJECT_ID(N'[xmigra].[development]')\n  AND type = N'U'\n)\nRAISERROR(N'Development script cannot be applied to a production database.', 11, 1);\n    END_OF_SQL\n  end\nend\n"

#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 "PRINT N'Removing data access artifacts:';\nDECLARE @sqlcmd NVARCHAR(1000); -- Built SQL command\nDECLARE @obj_name NVARCHAR(256); -- Name of object to drop\nDECLARE @obj_type NVARCHAR(40); -- Type of object to drop\n\nDECLARE AccObjs_cursor CURSOR LOCAL FOR\nSELECT [name], [type]\nFROM [xmigra].[access_objects]\nORDER BY [order] DESC;\n\nOPEN AccObjs_cursor;\n\nFETCH NEXT FROM AccObjs_cursor INTO @obj_name, @obj_type;\n\nWHILE @@FETCH_STATUS = 0 BEGIN\n  SET @sqlcmd = N'DROP ' + @obj_type + N' ' + @obj_name + N';';\n  EXEC sp_executesql @sqlcmd;\n  \n  FETCH NEXT FROM AccObjs_cursor INTO @obj_name, @obj_type;\nEND;\n\nCLOSE AccObjs_cursor;\nDEALLOCATE AccObjs_cursor;\n\nDELETE FROM [xmigra].[access_objects];\n\n"
end

#remove_undesired_indexes_sql ⇒ Object 



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

def remove_undesired_indexes_sql
  "PRINT N'Removing undesired indexes:';\n-- Iterate over indexes in [xmigra].[indexes] that don't have an entry in\n-- [xmigra].[updated_indexes].\nDECLARE @sqlcmd NVARCHAR(1000); -- Built SQL command\nDECLARE @index_name NVARCHAR(256); -- Name of index to drop\nDECLARE @table_name SYSNAME; -- Name of table owning index\nDECLARE @match_count INT; -- Number of matching index names\n\nDECLARE Index_cursor CURSOR LOCAL FOR\nSELECT \n  xi.[name], \n  MAX(QUOTENAME(OBJECT_SCHEMA_NAME(si.object_id)) + N'.' + QUOTENAME(OBJECT_NAME(si.object_id))), \n  COUNT(*)\nFROM [xmigra].[indexes] xi\nINNER JOIN sys.indexes si ON si.[name] = xi.[name]\nWHERE xi.[IndexID] NOT IN (\n  SELECT [IndexID]\n  FROM [xmigra].[updated_indexes]\n)\nGROUP BY xi.[name];\n\nOPEN Index_cursor;\n\nFETCH NEXT FROM Index_cursor INTO @index_name, @table_name, @match_count;\n\nWHILE @@FETCH_STATUS = 0 BEGIN\n  IF @match_count > 1\n  BEGIN\nRAISERROR(N'Multiple indexes are named %s', 11, 1, @index_name);\n  END;\n  \n  SET @sqlcmd = N'DROP INDEX ' + @index_name + N' ON ' + @table_name + N';';\n  EXEC sp_executesql @sqlcmd;\n  PRINT N'    Removed ' + @index_name + N'.';\n  \n  FETCH NEXT FROM Index_cursor INTO @index_name, @table_name, @match_count;\nEND;\n\nCLOSE Index_cursor;\nDEALLOCATE Index_cursor;\n\nDELETE FROM [xmigra].[indexes]\nWHERE [IndexID] NOT IN (\n  SELECT ui.[IndexID]\n  FROM [xmigra].[updated_indexes] ui\n);\n  END_OF_SQL\nend\n"

#remove_undesired_statistics_sql ⇒ Object 



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

def remove_undesired_statistics_sql
  "PRINT N'Removing undesired statistics objects:';\n-- Iterate over statistics in [xmigra].[statistics] that don't have an entry in\n-- [xmigra].[updated_statistics].\nDECLARE @sqlcmd NVARCHAR(1000); -- Built SQL command\nDECLARE @statsobj_name NVARCHAR(256); -- Name of statistics object to drop\nDECLARE @table_name SYSNAME; -- Name of table owning the statistics object\nDECLARE @match_count INT; -- Number of matching statistics object names\n\nDECLARE Stats_cursor CURSOR LOCAL FOR\nSELECT \n  QUOTENAME(xs.[Name]), \n  MAX(QUOTENAME(OBJECT_SCHEMA_NAME(ss.object_id)) + N'.' + QUOTENAME(OBJECT_NAME(ss.object_id))), \n  COUNT(ss.object_id)\nFROM [xmigra].[statistics] xs\nINNER JOIN sys.stats ss ON ss.[name] = xs.[Name]\nWHERE xs.[Columns] NOT IN (\n  SELECT us.[Columns]\n  FROM [xmigra].[updated_statistics] us\n  WHERE us.[Name] = xs.[Name]\n)\nGROUP BY xs.[Name];\n\nOPEN Stats_cursor;\n\nFETCH NEXT FROM Stats_cursor INTO @statsobj_name, @table_name, @match_count;\n\nWHILE @@FETCH_STATUS = 0 BEGIN\n  IF @match_count > 1\n  BEGIN\nRAISERROR(N'Multiple indexes are named %s', 11, 1, @statsobj_name);\n  END;\n  \n  SET @sqlcmd = N'DROP STATISTICS ' + @table_name + N'.' + @statsobj_name + N';';\n  EXEC sp_executesql @sqlcmd;\n  PRINT N'    Removed statistics object ' + @statsobj_name + N'.'\n  \n  FETCH NEXT FROM Stats_cursor INTO @statsobj_name, @table_name, @match_count;\nEND;\n\nCLOSE Stats_cursor;\nDEALLOCATE Stats_cursor;\n\nDELETE FROM [xmigra].[statistics]\nWHERE [Columns] NOT IN (\n  SELECT us.[Columns]\n  FROM [xmigra].[updated_statistics] us\n  WHERE us.[Name] = [Name]\n);\n  END_OF_SQL\nend\n"

#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
  "\n-- ------------- REVOKING PREVIOUSLY GRANTED PERMISSIONS ------------- --\n\nPRINT N'Revoking previously granted permissions:';\n-- Iterate over permissions listed in [xmigra].[revokable_permissions]\nDECLARE @sqlcmd NVARCHAR(1000); -- Built SQL command\nDECLARE @permissions NVARCHAR(200); \nDECLARE @object NVARCHAR(260); \nDECLARE @principal NVARCHAR(150);\n\nDECLARE Permission_cursor CURSOR LOCAL FOR\nSELECT\n  xp.[permissions],\n  xp.[object],\n  QUOTENAME(sdp.name)\nFROM [xmigra].[revokable_permissions] xp\nINNER JOIN sys.database_principals sdp ON xp.principal_id = sdp.principal_id;\n\nOPEN Permission_cursor;\n\nFETCH NEXT FROM Permission_cursor INTO @permissions, @object, @principal;\n\nWHILE @@FETCH_STATUS = 0 BEGIN\n  SET @sqlcmd = N'REVOKE ' + @permissions + N' ON ' + @object + ' FROM ' + @principal + N';';\n  BEGIN TRY\nEXEC sp_executesql @sqlcmd;\n  END TRY\n  BEGIN CATCH\n  END CATCH\n  \n  FETCH NEXT FROM Permission_cursor INTO @permissions, @object, @principal;\nEND;\n\nCLOSE Permission_cursor;\nDEALLOCATE Permission_cursor;\n\nDELETE FROM [xmigra].[revokable_permissions];\n  END_OF_SQL\nend\n"

#select_for_install_sql ⇒ Object 



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

def select_for_install_sql
  "PRINT N'Selecting migrations to apply:';\nDECLARE @BridgePoint INT;\nIF \#{upgrading_to_new_branch_test_sql}\nBEGIN\n  -- Get the [xmigra].[migrations] ApplicationOrder of the record corresponding to the branch transition\n  SET @BridgePoint = (\nSELECT MAX(m.[ApplicationOrder])\nFROM [xmigra].[migrations] m\nINNER JOIN [xmigra].[branch_upgrade] bu\n  ON m.[MigrationID] = bu.[CompletesMigration]\n  );\n  \n  UPDATE [xmigra].[migrations]\n  SET [Install] = 1\n  WHERE [ApplicationOrder] > @BridgePoint;\nEND\nELSE BEGIN\n  -- Get the [xmigra].[migrations] ApplicationOrder of the most recent version bridge migration\n  SET @BridgePoint = (\nSELECT COALESCE(MAX(m.[ApplicationOrder]), 0)\nFROM [xmigra].[applied] a\nINNER JOIN [xmigra].[migrations] m\n  ON a.[MigrationID] = m.[MigrationID]\nWHERE a.[VersionBridgeMark] <> 0\n  );\n  \n  UPDATE [xmigra].[migrations]\n  SET [Install] = 1\n  WHERE [MigrationID] NOT IN (\nSELECT a.[MigrationID] FROM [xmigra].[applied] a\n  )\n  AND [ApplicationOrder] > @BridgePoint;\nEND;\n\nINSERT INTO [xmigra].[previous_states] (\n  [Changed],\n  [MigrationApplicationOrder],\n  [FromMigrationID],\n  [ToRangeStartMigrationID],\n  [ToRangeEndMigrationID]\n)\nSELECT TOP (1)\n  CURRENT_TIMESTAMP,\n  -- Application order of last installed migration --\n  COALESCE(\n( \n  SELECT TOP(1) [ApplicationOrder] FROM [xmigra].[applied]\n  ORDER BY [ApplicationOrder] DESC\n),\n0\n  ),\n  ( -- Last installed migration --\nSELECT TOP (1) [MigrationID]\nFROM [xmigra].[applied]\nORDER BY [ApplicationOrder] DESC\n  ),\n  m.[MigrationID],\n  ( -- Last migration to install --\nSELECT TOP(1) [MigrationID] FROM [xmigra].[migrations]\nWHERE [Install] <> 0\nORDER BY [ApplicationOrder] DESC\n  )\nFROM [xmigra].[migrations] m\nWHERE m.[Install] <> 0\nORDER BY m.[ApplicationOrder] ASC;\n  END_OF_SQL\nend\n"

#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
  "PRINT N'Cleaning up from the upgrade:';\nDROP TABLE [xmigra].[migrations];\nDROP TABLE [xmigra].[updated_indexes];\nDROP TABLE [xmigra].[updated_statistics];\n  END_OF_SQL\nend\n"

#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
  
  ("(EXISTS (\n  SELECT TOP(1) * FROM [xmigra].[branch_upgrade]\n  WHERE [Next] = \#{branch_id_literal}\n))\n  END_OF_SQL\nend\n").chomp

#view_definition_template_sql ⇒ Object 



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

def view_definition_template_sql
  "CREATE VIEW [{filename}]\nAS SELECT <<<query>>>;\n"
end