使用Engines接入PostgreSQL查询

[hhyo]

新增

• 使用Engines接入PostgreSQL查询，支持库级授权
• PgSQLEngine测试用例

修改

• 整合实例资源获取的方法，获取实例库、表、模式、字段合并到一个方法

依赖变动

• psycopg2-binary==2.7.7

[codecov]

Codecov Report

Merging #91 into master will increase coverage by 0.92%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master      #91      +/-   ##
==========================================
+ Coverage    67.5%   68.43%   +0.92%     
==========================================
  Files          60       61       +1     
  Lines        5946     6085     +139     
==========================================
+ Hits         4014     4164     +150     
+ Misses       1932     1921      -11

Impacted Files	Coverage Δ
sql/urls.py	100% <ø> (ø)	⬆️
sql/models.py	95.62% <ø> (ø)	⬆️
sql/engines/mysql.py	49.17% <100%> (ø)	⬆️
sql/engines/tests.py	100% <100%> (ø)	⬆️
sql/engines/mssql.py	77.22% <100%> (ø)	⬆️
sql/engines/__init__.py	64.58% <50%> (-4.31%)	⬇️
sql/query.py	47.89% <55.55%> (-0.44%)	⬇️
sql/instance.py	31.42% <6.25%> (+4.04%)	⬆️
sql/engines/pgsql.py	87.5% <87.5%> (ø)

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