代码页以前也称为码页、编码、字集、字符集或经过编码的字符集。
A code page has traditionally been known as codepage, encoding, charset, character set, and coded character set.
如果没有BOM，也没有给定的编码属性，则假定BLOB数据由utf - 8代码点组成。
If there is no BOM and there is no given encoding attribute, the BLOB data is assumed to consist of UTF-8 code points.
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