优雅的码农

摘要： 事务不commit或rollback直接close connection，据目前查找的资料(参照database分类中的文章)会产生以下后果：1.如果直接使用jdbc，则具体的实现取决于不同的数据库。比如，oracle会commit，而sql server会rollback.2.如果使用数据库连接池，还取决于数据库连接池的实现。 阅读全文

摘要： Earlier today I saw a transaction question targeted for a completely different audience pop up as the first headline news item on a well known java news site. Besides giving me and my colleagues a good laugh about bugs and transactions it also touched upon one of the questions that have given me a c 阅读全文

摘要： Please let me know when do we require to call the method connection.rollback();try{ connection = getConnection(); connection.setAutoCommit(false); pstmt1 = connection.preparedstatement (...);... pstt1.executeUpdate(); pstmt2 = connection.preparedstatement (...);... pstt2.executeUpdate(); conn... 阅读全文

摘要： Ryan Davis’sRuby QuickRefsays (without explanation):Don’t rescue Exception. EVER. or I will stab you.Why not? What’s the right thing to do?Exceptionis the root of Ruby's exception hierarchy, so when yourescue Exceptionyou rescue fromeverything, including subclasses such asSyntaxError,LoadError, 阅读全文

摘要： It is important to understand the place of StandardError in the hierarchy of ruby exceptions:class TestException1 < StandardErrorend class TestException2 < Exceptionend begin begin raise TestException1 rescue puts $!.class.name end begin raise TestException2 rescue puts $!.class.na... 阅读全文