安裝 mysql2 驅動:
gem install mysql2
你需要使用 –with-mysql-config 配置 mysql_config 的路徑,如: –with-mysql-config=/some/random/path/bin/mysql_config。
連接配接
連接配接資料庫文法如下:client = Mysql2::Client.new(:host => "localhost", :username => "root")
查詢results = client.query("SELECT * FROM users WHERE group='githubbers'")
特殊字元轉義escaped = client.escape("gi'thu\"bbe\0r's")
results = client.query("SELECT * FROM users WHERE group='#{escaped}'")
計算結果集傳回的數量:results.count
疊代結果集:results.each do |row|
# row 是哈希
# 鍵值是資料庫字段
# 值都是對應 MySQL中資料
puts row["id"] # row["id"].class == Fixnum
if row["dne"] # 不存在則是 nil
puts row["dne"]
end
end
執行個體#!/usr/bin/ruby -w
require 'mysql2'
client = Mysql2::Client.new(
:host => '127.0.0.1', # 主機
:username => 'root', # 使用者名
:password => '123456', # 密碼
:database => 'test', # 資料庫
:encoding => 'utf8' # 編碼
)
results = client.query("SELECT VERSION()")
results.each do |row|
puts row
end
以上執行個體運作輸出結果為:{"VERSION()"=>"5.6.21"}
連接配接選項Mysql2::Client.new(
:host,
:username,
:password,
:port,
:database,
:socket = '/path/to/mysql.sock',
:flags = REMEMBER_OPTIONS | LONG_PASSWORD | LONG_FLAG | TRANSACTIONS | PROTOCOL_41 | SECURE_CONNECTION | MULTI_STATEMENTS,
:encoding = 'utf8',
:read_timeout = seconds,
:write_timeout = seconds,
:connect_timeout = seconds,
:reconnect = true/false,
:local_infile = true/false,
:secure_auth = true/false,
:default_file = '/path/to/my.cfg',
:default_group = 'my.cfg section',
:init_command => sql
)
本文由職坐标整理釋出,更多相關知識,請關注職坐标資料庫MySQL頻道!