# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 95
def initialize(connection, logger, connection_options, config)
  super(connection, logger, config)

  @active     = nil
  @statements = StatementPool.new(self.class.type_cast_config_to_integer(config[:statement_limit]))

  configure_connection
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 142
def active?
  @active != false
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 166
def allowed_index_name_length
  index_name_length - 2
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 155
def clear_cache!
  @statements.clear
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 148
def disconnect!
  super
  @active = false
  @connection.close rescue nil
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 175
def encoding
  @connection.encoding.to_s
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 238
def exec_delete(sql, name = "SQL", binds = [])
  exec_query(sql, name, binds)
  @connection.changes
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 205
def exec_query(sql, name = nil, binds = [], prepare: false)
  type_casted_binds = type_casted_binds(binds)

  log(sql, name, binds, type_casted_binds) do
    ActiveSupport::Dependencies.interlock.permit_concurrent_loads do
      # Don't cache statements if they are not prepared
      unless prepare
        stmt = @connection.prepare(sql)
        begin
          cols = stmt.columns
          unless without_prepared_statement?(binds)
            stmt.bind_params(type_casted_binds)
          end
          records = stmt.to_a
        ensure
          stmt.close
        end
      else
        cache = @statements[sql] ||= {
          stmt: @connection.prepare(sql)
        }
        stmt = cache[:stmt]
        cols = cache[:cols] ||= stmt.columns
        stmt.reset!
        stmt.bind_params(type_casted_binds)
        records = stmt.to_a
      end

      ActiveRecord::Result.new(cols, records)
    end
  end
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 200
def explain(arel, binds = [])
  sql = "EXPLAIN QUERY PLAN #{to_sql(arel, binds)}"
  SQLite3::ExplainPrettyPrinter.new.pp(exec_query(sql, "EXPLAIN", []))
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 400
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 244
def last_inserted_id(result)
  @connection.last_insert_row_id
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 270
def new_column_from_field(table_name, field) # :nondoc:
  case field["dflt_value"]
  when /^null$/i
    field["dflt_value"] = nil
  when /^'(.*)'$/m
    field["dflt_value"] = $1.gsub("''", "'")
  when /^"(.*)"$/m
    field["dflt_value"] = $1.gsub('""', '"')
  end

  collation = field["collation"]
  sql_type = field["type"]
  type_metadata = fetch_type_metadata(sql_type)
  new_column(field["name"], field["dflt_value"], type_metadata, field["notnull"].to_i == 0, table_name, nil, collation)
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 331
def rename_table(table_name, new_name)
  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 134
def supports_datetime_with_precision?
  true
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 104
def supports_ddl_transactions?
  true
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 179
def supports_explain?
  true
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 126
def supports_foreign_keys_in_create?
  sqlite_version >= "3.6.19"
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 159
def supports_index_sort_order?
  true
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 138
def supports_multi_insert?
  sqlite_version >= "3.7.11"
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 112
def supports_partial_index?
  sqlite_version >= "3.8.0"
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 108
def supports_savepoints?
  true
end

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 118
def supports_statement_cache?
  true
end

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

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 338
def valid_alter_table_type?(type)
  type.to_sym != :primary_key
end