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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! This chapter explains 7 structural patterns, due to space problems, the remaining 11 behavioral patterns,In addition, the war situation of the army is different, The composition of the loss varies considerably, Taking the Soviet Union during the Soviet-German War as an example, The average monthly losses of Soviet troops over the years are: In 1941, 710,000, 1942, 614,000, 1943, 655,000, 1944, 573,000 and 1945, 700,000, the difference is not too big. The ratio of 1941, which suffered the worst loss, to 1944, which suffered the least loss, is only 1.24 times. However, the proportion of dead, wounded and prisoners in the losses over the years is quite different. The average monthly number of dead and missing persons in 1941, 271,000 in 1942, 1943, 147,000 in 1944 and 186,000 in 1945 is 496,000, 3.37 times higher than that in 1945.易风轩只觉得义愤填膺，心头一团怒火在燃烧。因又说起这件案子，两人嘀咕了好一会。恐怕一分钱的版权费都不需要给了。世伯心系国防，侄儿佩服。