Created
March 18, 2015 01:47
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convert character set to utf8mb4 used for support Emoji on MySQL
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desc "Database related tasks" | |
namespace :database do | |
desc "Convert to utf8mb4" | |
task convert_to_utf8mb4: :environment do | |
connection = ActiveRecord::Base.connection | |
database = connection.current_database | |
connection.execute "ALTER DATABASE #{database} CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci;" | |
puts "Converted #{database} character set" | |
# Change all tables | |
connection.tables.each do |table| | |
connection.columns(table).each do |column| | |
if column.sql_type == "varchar(255)" | |
puts "#{column.name} is varchar(255)" | |
# Check for 255 indexed columns | |
connection.indexes(table).each do |index| | |
if index.columns.include?(column.name) | |
puts "#{column.name} has index, altering length..." | |
connection.execute "ALTER TABLE #{table} CHANGE `#{column.name}` `#{column.name}` varchar(191);" | |
puts "...done!" | |
end | |
end | |
end | |
end | |
puts "Converting #{table}..." | |
connection.execute "ALTER TABLE #{table} CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;" | |
puts "...#{table} converted!" | |
connection.columns(table).each do |column| | |
if column.type == :string || column.type == :text | |
puts "Converting #{column.name}..." | |
connection.execute "ALTER TABLE #{table} CHANGE `#{column.name}` `#{column.name}` #{column.sql_type} CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;" | |
puts "...#{column.name} done!" | |
end | |
end | |
puts "Repairing #{table}..." | |
connection.execute "REPAIR TABLE #{table};" | |
puts "...#{table} repaired!" | |
puts "Optimizing #{table}..." | |
connection.execute "OPTIMIZE TABLE #{table};" | |
puts "...#{table} optimized!" | |
end | |
end | |
end |
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