Connection Methods

The database connection method is usually selected based on factors such as security, performance, scalability, and implementation complexity. For details, see Table 1.

**Table 1** Connection Methods
Connection Method	Advantage	Disadvantage	Selection Principle
Non-encrypted	This method is easy to implement and does not require additional encryption and decryption operations. It features high performance because no encryption or decryption operation is required, which reduces the overhead of data transmission.	It provides low security and data is easily intercepted or tampered with during transmission. It is not suitable for sensitive data transmission and may violate privacy protection laws and regulations.	It applies only to internal networks or environments that have low security requirements.
SSL	It provides encrypted transmission. Data is protected during transmission, ensuring high security. It supports client/server identity authentication, which enhances security.	It is complex in configuration and management, and certificates need to be issued and updated. Some performance overhead may be added, especially when it is used for encrypting and decrypting large amounts of data.	It applies to environments that require high data transmission security, such as finance and healthcare industries.
UDS	It applies to local communication without passing through the network, featuring a high transmission speed. No extra network overhead is required, and it is not vulnerable to network attacks.	It is used only for the communication between processes on the same host but cannot be used for remote connections.	It applies to local communication scenarios, for example, data exchange between local services and applications.
SM-based TLS	It supports the ShangMi (SM) cryptographic algorithm, which complies with the legal requirements for encryption algorithms in China. It provides as good security as the standard TLS and applies to scenarios that have special requirements on encryption standards.	It may be restricted in other countries because other countries may not support the SM cryptographic algorithm. Performance overhead may be added because the SM cryptographic algorithm may be more complex than traditional encryption algorithms.	It applies to specific industries in China, such as government and finance, where legal requirements are posed on encryption standards in China.