### Home Classes Methods

### In Files

- lib/active_record/connection_adapters/mysql_adapter.rb

### Parent

AbstractMysqlAdapter

### Namespace

- CLASS ActiveRecord::ConnectionAdapters::MysqlAdapter::StatementPool

### Methods

- ::new
- #active?
- #clear_cache!
- #client_encoding
- #disconnect!
- #exec_delete
- #exec_query
- #exec_update
- #execute_and_free
- #last_inserted_id
- #reconnect!
- #reset!
- #select_rows
- #supports_statement_cache?
- #type_cast

### Files

- README.rdoc

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No matching classes.

# ActiveRecord::ConnectionAdapters::MysqlAdapter

The MySQL adapter will work with both Ruby/MySQL, which is a Ruby-based MySQL adapter that comes bundled with Active Record, and with the faster C-based MySQL/Ruby adapter (available both as a gem and from www.tmtm.org/en/mysql/ruby/).

Options:

- `:host` - Defaults to "localhost".

- `:port` - Defaults to 3306.

- `:socket` - Defaults to "/tmp/mysql.sock".

- `:username` - Defaults to "root"

- `:password` - Defaults to nothing.

- `:database` - The name of the database. No default, must be provided.

- `:encoding` - (Optional) Sets the client encoding by executing "SET NAMES <encoding>" after connection.

- `:reconnect` - Defaults to false (See MySQL documentation: dev.mysql.com/doc/refman/5.0/en/auto-reconnect.html).

- `:sslca` - Necessary to use MySQL with an SSL connection.

- `:sslkey` - Necessary to use MySQL with an SSL connection.

- `:sslcert` - Necessary to use MySQL with an SSL connection.

- `:sslcapath` - Necessary to use MySQL with an SSL connection.

- `:sslcipher` - Necessary to use MySQL with an SSL connection.

### Constants

ADAPTER_NAME
ENCODINGS

  Taken from here:

      https://github.com/tmtm/ruby-mysql/blob/master/lib/mysql/charset.rb

  Author: TOMITA Masahiro <tommy@tmtm.org>

### Public Class Methods

new(connection, logger, connection_options, config) click to toggle source

    # File lib/active_record/connection_adapters/mysql_adapter.rb, line 126
    def initialize(connection, logger, connection_options, config)
      super
      @statements = StatementPool.new(@connection,
                                      config.fetch(:statement_limit) { 1000 })
      @client_encoding = nil
      connect
    end

### Public Instance Methods

active?() click to toggle source

CONNECTION MANAGEMENT ====================================

    # File lib/active_record/connection_adapters/mysql_adapter.rb, line 175
    def active?
      if @connection.respond_to?(:stat)
        @connection.stat
      else
        @connection.query 'select 1'
      end

      # mysql-ruby doesn't raise an exception when stat fails.
      if @connection.respond_to?(:errno)
        @connection.errno.zero?
      else
        true
      end
    rescue Mysql::Error
      false
    end

clear_cache!() click to toggle source

Clears the prepared statements cache.

    # File lib/active_record/connection_adapters/mysql_adapter.rb, line 223
    def clear_cache!
      @statements.clear
    end

client_encoding() click to toggle source

Get the client encoding for this database

    # File lib/active_record/connection_adapters/mysql_adapter.rb, line 275
    def client_encoding
      return @client_encoding if @client_encoding

      result = exec_query(
        "SHOW VARIABLES WHERE Variable_name = 'character_set_client'",
        'SCHEMA')
      @client_encoding = ENCODINGS[result.rows.last.last]
    end

disconnect!() click to toggle source

Disconnects from the database if already connected. Otherwise, this method does nothing.

    # File lib/active_record/connection_adapters/mysql_adapter.rb, line 200
    def disconnect!
      @connection.close rescue nil
    end

exec_delete(sql, name, binds) click to toggle source

    # File lib/active_record/connection_adapters/mysql_adapter.rb, line 336
    def exec_delete(sql, name, binds)
      affected_rows = 0

      exec_query(sql, name, binds) do |n|
        affected_rows = n
      end

      affected_rows
    end

Also aliased as: exec_update
exec_query(sql, name = 'SQL', binds = []) click to toggle source

    # File lib/active_record/connection_adapters/mysql_adapter.rb, line 284
    def exec_query(sql, name = 'SQL', binds = [])
      # If the configuration sets prepared_statements:false, binds will
      # always be empty, since the bind variables will have been already
      # substituted and removed from binds by BindVisitor, so this will
      # effectively disable prepared statement usage completely.
      if binds.empty?
        result_set, affected_rows = exec_without_stmt(sql, name)
      else
        result_set, affected_rows = exec_stmt(sql, name, binds)
      end

      yield affected_rows if block_given?

      result_set
    end

exec_update(sql, name, binds) click to toggle source
Alias for: exec_delete
execute_and_free(sql, name = nil) click to toggle source

    # File lib/active_record/connection_adapters/mysql_adapter.rb, line 323
    def execute_and_free(sql, name = nil)
      result = execute(sql, name)
      ret = yield result
      result.free
      ret
    end

last_inserted_id(result) click to toggle source

    # File lib/active_record/connection_adapters/mysql_adapter.rb, line 300
    def last_inserted_id(result)
      @connection.insert_id
    end

reconnect!() click to toggle source

    # File lib/active_record/connection_adapters/mysql_adapter.rb, line 192
    def reconnect!
      disconnect!
      clear_cache!
      connect
    end

reset!() click to toggle source

    # File lib/active_record/connection_adapters/mysql_adapter.rb, line 204
    def reset!
      if @connection.respond_to?(:change_user)
        # See http://bugs.mysql.com/bug.php?id=33540 -- the workaround way to
        # reset the connection is to change the user to the same user.
        @connection.change_user(@config[:username], @config[:password], @config[:database])
        configure_connection
      end
    end

select_rows(sql, name = nil) click to toggle source

DATABASE STATEMENTS ======================================

    # File lib/active_record/connection_adapters/mysql_adapter.rb, line 215
    def select_rows(sql, name = nil)
      @connection.query_with_result = true
      rows = exec_query(sql, name).rows
      @connection.more_results && @connection.next_result    # invoking stored procedures with CLIENT_MULTI_RESULTS requires this to tidy up else connection will be dropped
      rows
    end

supports_statement_cache?() click to toggle source

Returns true, since this connection adapter supports prepared statement caching.

    # File lib/active_record/connection_adapters/mysql_adapter.rb, line 136
    def supports_statement_cache?
      true
    end

type_cast(value, column) click to toggle source

QUOTING ==================================================

    # File lib/active_record/connection_adapters/mysql_adapter.rb, line 163
    def type_cast(value, column)
      return super unless value == true || value == false

      value ? 1 : 0
    end

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