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之前merge反了
Merge remote-tracking branch 'origin/LYZ'
Merge remote-tracking branch 'origin/LYZ'
Init server php files
finish basic query part of db class.
Finish insert function for db class.
Merge branch 'class-database'

Conflicts:
	Server/src/db.php
	Server/test/db_test.php
Delete download.php
Delete upload.php
Update db_test.php

delete the password
finish update and delete part of db class.
update test cases for update and delete function for class db.
Merge branch 'class-database'

Conflicts:
	Server/src/db.php
	Server/test/db_test.php
finish a basic version of select function
Merge branch 'class-database'

Conflicts:
	Server/test/db_test.php
add config file (define constant like DB_HOST, etc.).
fix connection info for db test.
add DB_NAME to config file
add load file.