# Functions
gorm 插件.
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如果是字符串，则转化为int64, 浮点数丢失精度，无法转化则为0.
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推荐使用Transaction函数.
推荐使用Transaction函数.
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获取gorm db对象，其他包需要执行数据库查询的时候，只要通过tools.getDB()获取db对象即可。不用担心协程并发使用同样的db对象会共用同一个连接，db对象在调用他的方法的时候会从数据库连接池中获取新的连接.
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推荐使用Transaction函数.
初始化日志打印函数.
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开启一个事务执行回调，推荐使用，防止错误使用commit和rollback.
# Constants
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# Variables
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# Structs
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这里存放的是一些封装.
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# Interfaces
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