使用带有MySQL2 gem的预处理语句？

Question

如何在MySQL中创建预备语句insert和select查询？我正在使用MySQL2 gem,我的连接对象如下所示:

 con = Mysql2::Client.new(:host => "#{ENV['DB_HOST']}", :port => '3306', :username => "#{ENV['DB_UNAME']}", :password => "#{ENV['DB_PWD']}", :database => 'dbname')

Answer 1

不幸的是,mysql2 gem尚未准备好语句支持.贡献者计划在不久的将来添加这样的功能,正如我们从Pull Request讨论中看到的那样:

https://github.com/brianmario/mysql2/pull/289

如果您的应用程序中必须准备好语句,我建议您阅读Sequel,它对预准备语句和绑定变量提供了非常好的支持:

https://github.com/jeremyevans/sequel

http://sequel.jeremyevans.net/rdoc/files/doc/prepared_statements_rdoc.html

UPDATE

正如@lulalala从版本0.4.0 开始所提到的,MySQL2 gem支持预编译语句:

statement = @client.prepare("SELECT * FROM users WHERE login_count = ?")
result1 = statement.execute(1) # Binds the value 1 to the placeholder 
result2 = statement.execute(2) # Binds the value 2 to the placeholder

statement = @client.prepare("SELECT * FROM users WHERE last_login >= ? AND location LIKE ?")
result = statement.execute(1, "CA") # Binds 1 and 'CA' to the placeholders, respectively

我希望有所帮助.