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(2) There are seven structural modes: adapter mode, decorator mode, agent mode, appearance mode, bridging mode, combination mode and element sharing mode.　　为了打倒来自天空的怪物涅墨西斯，每天都在努力的进行魔法特训，板栗和葫芦心里一动，却还不甚了了。When Liu Guangyuan and other four people finished laying new mines and were ready to return, The Vietnamese army launched a new round of attacks. The main force of this attack was still those "living biological weapons" similar in appearance to "dogs". Among the soldiers responsible for continuing to stick to their positions, gunner Wang Zeduan saw very clearly because he was deployed on a higher favorable shooting terrain. In the interview, he recalled: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! This chapter explains 7 structural patterns, due to space problems, the remaining 11 behavioral patterns,