Driver class 'net.sourceforge.jtds.jdbc.Driver' could not be found, make sure the 'MS SQL Server' driver (jar file) is installed. Driver class 'net.sourceforge.jtds.jdbc.Driver' could not be found, ...

Section 1.1. What is Computer Science About? 2 Section A.2. Method Declarations 544 Section A.3. Loops 546 Section A.4. Conditionals 547 Section A.5. Operators 547 Section A.6. String Escapes 548 ...

未提交读(Read Uncommitted)：可能出现脏读（可能读取到其他会话中未提交事务修改的数据）、不可重复读、幻读 提交读(Read Committed)：只能读取到已经提交的数据。Oracle等多数数据库默认都是该级别 (不重复读) 可重复读(Repeated Read)：可重复读。在同一个事务内的 ...