目录1. 问题背景介绍2. 多种解决方案对比2.1 对称加密（AES）2.2 非对称加密（RSA）2.3 数据库透明加密（TDE）2.4 应用层字段加密（Spring Boot + JCE）3. 各方案优缺点分析4. 选型建议与适用场景5. 实际应用效果验证
In C (or C++ for that matter), pointers are special if they have the value zero: I am adviced to set pointers to zero after freeing their memory, because it means freeing the pointer again isn\'t dang
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