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csdn
23 年
谁能总结一下,java中的String类型和数据库中的varchar类型.......
谁能总结一下,java中的String类型和数据库中的varchar类型,什么时候是null,什么时候是""(空),特别是这个两个有联系的时候(从数据库取值,varchar没有记录等等情况),谢谢!
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