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Through the management of the connection pool, the sharing of database connections is realized, and the connection does not need to be recreated every time, thus saving the overhead of database recreation and improving the performance of the system!3. The state switching is not obvious, only the state variable is assigned, such as this.state = 'weakLight'. In actual development, such operations are easily missed by programmers. There is no way to clearly understand how many states there are in the light unless you patiently read all the code in the buttonWasPressed method. When there are many kinds of states, the process of a switch seems to be buried in a dark corner of a huge method.The fourth: singleInstanceAny feedback mechanism will be weaponized to attack legitimate users and content.The second season's program has been upgraded and innovated in an all-round way. In order to promote the transformation of the achievements of "Charming China City," Charming China City? The "City Alliance" was announced and the "Charming Card" program was officially launched to leverage the development of local industries with city brands and inject a strong impetus into the upgrading of cultural and tourism industries.郦食其道：沛公是时候了，如今秦王子婴新上位，根基不稳。碧瑶之死，你们难受，天启同样也很难受。