# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 92
def self.database_exists?(config)
  config = config.symbolize_keys
  if config[:database] == ":memory:"
    true
  else
    database_file = defined?(Rails.root) ? File.expand_path(config[:database], Rails.root) : config[:database]
    File.exist?(database_file)
  end
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 86
def initialize(connection, logger, connection_options, config)
  @memory_database = config[:database] == ":memory:"
  super(connection, logger, config)
  configure_connection
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 161
def active?
  !@connection.closed?
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 172
def disconnect!
  super
  @connection.close rescue nil
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 186
def encoding
  @connection.encoding.to_s
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 308
def foreign_keys(table_name)
  fk_info = exec_query("PRAGMA foreign_key_list(#{quote(table_name)})", "SCHEMA")
  fk_info.map do |row|
    options = {
      column: row["from"],
      primary_key: row["to"],
      on_delete: extract_foreign_key_action(row["on_delete"]),
      on_update: extract_foreign_key_action(row["on_update"])
    }
    ForeignKeyDefinition.new(table_name, row["table"], options)
  end
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 165
def reconnect!
  super
  connect if @connection.closed?
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 237
def rename_table(table_name, new_name)
  schema_cache.clear_data_source_cache!(table_name.to_s)
  schema_cache.clear_data_source_cache!(new_name.to_s)
  exec_query "ALTER TABLE #{quote_table_name(table_name)} RENAME TO #{quote_table_name(new_name)}"
  rename_table_indexes(table_name, new_name)
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 122
def requires_reloading?
  true
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 130
def supports_check_constraints?
  true
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 146
def supports_common_table_expressions?
  database_version >= "3.8.3"
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 157
def supports_concurrent_connections?
  !@memory_database
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 138
def supports_datetime_with_precision?
  true
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 102
def supports_ddl_transactions?
  true
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 190
def supports_explain?
  true
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 118
def supports_expression_index?
  database_version >= "3.9.0"
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 126
def supports_foreign_keys?
  true
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 177
def supports_index_sort_order?
  true
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 150
def supports_insert_on_conflict?
  database_version >= "3.24.0"
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 142
def supports_json?
  true
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 194
def supports_lazy_transactions?
  true
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 114
def supports_partial_index?
  true
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 106
def supports_savepoints?
  true
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 110
def supports_transaction_isolation?
  true
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 134
def supports_views?
  true
end