The insert and update methods are a bit more complex because they need to format the SQL statements with additional fields for the input data.
insert和update方法要复杂一些,因为它们需要使用用于输入数据的额外字段格式化sql语句。
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Insert tooth bit applies in every serious geography especially hard rock; it has stable drilling speed and can drill the hardness of rock at 1-6 grades.