Process bytea to longblob,add column comment、table comment.#27

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Yangph wants to merge 9 commits intoChrisLundquist:masterfrom Yangph:master

+209-27

Commits on Mar 16, 2021

1.support PHP7 ，need php Ds（Map）.
Yangph
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Commits on Mar 25, 2021

Support insert multiple rows using a single SQL INSERT statement.
Yangph
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Support different line breaks: \r\n and \n, files under unix and windows OS.
Yangph
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Commits on Apr 13, 2021

Fix conversion incomplete when progress not equals 1, insert include bytea content don't merge.
Yangph
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