update

README.md

@@ -1,2 +1,51 @@
 # gensql
 Python package to generate random simple ddls and queries with a brute-force approach
+
+## Description
+
+### Summary
+This is a standalone database and query generation tool.
+* Features: table, data and query generation
+* Language: `Python 3`
+* Dialects: mainly `MySQL`
+
+### Usage
+You could see the tests unders `./sqlgen/test` for examples. Generally, we have:
+* A database generator: `./sqlgen/gentable`
+* A SQL generator: `./sqlgen/gensql`
+* A general driver to connect different databases `driver.py`
+````Bash
+usage: driver.py [-h] [-D {mysql,mariadb,tidb,postgres,sqlite,timescale}]
+                 [-H HOST] [-P PORT] [-u USER] [-p PASSWORD] [-d DATABASE]
+
+optional arguments:
+  -h, --help            show this help message and exit
+  -D {mysql,mariadb,tidb,postgres,sqlite,timescale}, --driver {mysql,mariadb,tidb,postgres,sqlite,timescale}
+                        database server
+  -H HOST, --host HOST  host
+  -P PORT, --port PORT  port
+  -u USER, --user USER  the user to connect the database
+  -p PASSWORD, --password PASSWORD
+                        password
+  -d DATABASE, --database DATABASE
+                        use the given database. Need file path if connecting
+                        to sqlite.
+````
+## Tests
+````Bash
+python3 -m unittest discover
+````
+
+## Dependencies
+* Python (>= 3.7))
+* moz-sql-parser (dev branch only)
+    *  For MySQL, it is better to use [customized version](https://github.com/zhangysh1995/moz-sql-parser)
+* Database drivers
+    *  MySQL: `mysql-connector-python` (>= 8.0.19)
+
+## Contributions
+If you want  to improve this tool, you could start from the following lists:
+* Refactor
+    *  Hard-coded generation rules in `./sqlgen/gen*`
+* Unit tests
+    *  Check `./sqlgen/test`