Development of three database general SQL code based on PG Oracle and MySQL

1 brief introduction

1.1 Background introduction

Currently RDBMS Various , Traditional SQL Server, DB2, cloud RDS With ants OB, Tencent's TD etc. , Per library sql There are differences in grammar , There are mainly three kinds in the market Oracle,PostgreSQL,MySQL. This has caused the troubles of most product developers , That is to make the product fit most libraries , You need to write a grammar for each library , Increased development volume and development efficiency . Under such perplexity , One sql, The requirement of multi database commonality arises at the historic moment .

1.2 Language tools

Language tools and versions needed in the process

name	edition	purpose
python	3.7.6	Basic development language
Oracle	11.2.0	RDBMS
PostgreSQL	10.18	RDBMS
MySQL	8.0.24	RDBMS

1.3 Actual combat scene

A financial asset allocation business scenario , Need to use python perform sql To convert the data 、 Calculation and cleaning .sql Unified use of the following methods for character conversion to achieve a piece of code multi base common

2 Development points

python Executive sql Need to support PG,O