115 lines
4.1 KiB
Ruby
115 lines
4.1 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module Database
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module Partitioning
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class ReplaceTable
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DELIMITER = ";\n\n"
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attr_reader :original_table, :replacement_table, :replaced_table, :primary_key_column,
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:sequence, :original_primary_key, :replacement_primary_key, :replaced_primary_key
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def initialize(connection, original_table, replacement_table, replaced_table, primary_key_column)
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@connection = connection
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@original_table = original_table
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@replacement_table = replacement_table
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@replaced_table = replaced_table
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@primary_key_column = primary_key_column
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@sequence = default_sequence(original_table, primary_key_column)
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@original_primary_key = default_primary_key(original_table)
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@replacement_primary_key = default_primary_key(replacement_table)
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@replaced_primary_key = default_primary_key(replaced_table)
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end
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def perform
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yield sql_to_replace_table if block_given?
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execute(sql_to_replace_table)
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end
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private
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attr_reader :connection
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delegate :execute, :quote_table_name, :quote_column_name, to: :connection
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def default_sequence(table, column)
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"#{table}_#{column}_seq"
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end
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def default_primary_key(table)
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"#{table}_pkey"
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end
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def sql_to_replace_table
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@sql_to_replace_table ||= combined_sql_statements.map(&:chomp).join(DELIMITER)
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end
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def combined_sql_statements
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statements = []
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statements << alter_column_default(original_table, primary_key_column, expression: nil)
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statements << alter_column_default(replacement_table, primary_key_column,
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expression: "nextval('#{quote_table_name(sequence)}'::regclass)")
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statements << alter_sequence_owned_by(sequence, replacement_table, primary_key_column)
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rename_table_objects(statements, original_table, replaced_table, original_primary_key, replaced_primary_key)
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rename_table_objects(statements, replacement_table, original_table, replacement_primary_key, original_primary_key)
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statements
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end
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def rename_table_objects(statements, old_table, new_table, old_primary_key, new_primary_key)
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statements << rename_table(old_table, new_table)
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statements << rename_constraint(new_table, old_primary_key, new_primary_key)
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rename_partitions(statements, old_table, new_table)
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end
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def rename_partitions(statements, old_table_name, new_table_name)
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Gitlab::Database::PostgresPartition.for_parent_table(old_table_name).each do |partition|
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new_partition_name = partition.name.sub(/#{old_table_name}/, new_table_name)
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old_primary_key = default_primary_key(partition.name)
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new_primary_key = default_primary_key(new_partition_name)
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statements << rename_constraint(partition.identifier, old_primary_key, new_primary_key)
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statements << rename_table(partition.identifier, new_partition_name)
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end
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end
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def alter_column_default(table_name, column_name, expression:)
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default_clause = expression.nil? ? 'DROP DEFAULT' : "SET DEFAULT #{expression}"
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<<~SQL
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ALTER TABLE #{quote_table_name(table_name)}
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ALTER COLUMN #{quote_column_name(column_name)} #{default_clause}
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SQL
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end
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def alter_sequence_owned_by(sequence_name, table_name, column_name)
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<<~SQL
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ALTER SEQUENCE #{quote_table_name(sequence_name)}
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OWNED BY #{quote_table_name(table_name)}.#{quote_column_name(column_name)}
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SQL
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end
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def rename_table(old_name, new_name)
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<<~SQL
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ALTER TABLE #{quote_table_name(old_name)}
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RENAME TO #{quote_table_name(new_name)}
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SQL
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end
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def rename_constraint(table_name, old_name, new_name)
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<<~SQL
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ALTER TABLE #{quote_table_name(table_name)}
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RENAME CONSTRAINT #{quote_column_name(old_name)} TO #{quote_column_name(new_name)}
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SQL
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end
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end
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end
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end
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end
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