Update sqlx dependencies to version 0.6.49-beta.4 and refactor databa… #1732

Job	Run time
compile_and_lint	1m 37s
test (mssql, mssql, mssql://root:[email protected]/sqlpage)	2m 32s
test (odbc, postgres, Driver={PostgreSQL Unicode};Server=127.0.0.1;Port=5432;Database=sqlpage;UID...	5m 49s
windows_test	3m 30s
test (postgres, postgres, postgres://root:[email protected]/sqlpage)	2m 25s
docker_build (linux/arm/v7)	9m 28s
test (mysql, mysql, mysql://root:[email protected]/sqlpage)	2m 10s
docker_build (linux/arm64)	9m 18s
docker_build (linux/amd64)	8m 34s
docker_push	12s
	45m 35s

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