Merge pull request #60 from yangchangshun/improve-readme

Docs: update README.md

Author: eric-epsilla

README.md

@@ -38,19 +38,23 @@ docker run -d -p 18888:8888 epsilla/vectordb
 ```python
 from pyepsilla import vectordb
 
+db_name = "MyDB"
+db_path = "/tmp/epsilla"
+table_name = "MyTable"
+
 ## 1.Connect to vectordb
 client = vectordb.Client(
   host='localhost',
   port='8888'
 )
 
 ## 2.Load and use a database
-client.load_db(db_name="MyDB", db_path="/tmp/epsilla")
-client.use_db(db_name="MyDB")
+client.load_db(db_name, db_path)
+client.use_db(db_name)
 
 ## 3.Create a table in the current database
 client.create_table(
-  table_name="MyTable",
+  table_name=table_name,
   table_fields=[
     {"name": "ID", "dataType": "INT", "primaryKey": True},
     {"name": "Doc", "dataType": "STRING"},
@@ -60,7 +64,7 @@ client.create_table(
 
 ## 4.Insert records
 client.insert(
-  table_name="MyTable",
+  table_name=table_name,
   records=[
     {"ID": 1, "Doc": "Berlin", "Embedding": [0.05, 0.61, 0.76, 0.74]},
     {"ID": 2, "Doc": "London", "Embedding": [0.19, 0.81, 0.75, 0.11]},
@@ -72,7 +76,7 @@ client.insert(
 
 ## 5.Search with specific response field
 status_code, response = client.query(
-  table_name="MyTable",
+  table_name=table_name,
   query_field="Embedding",
   query_vector=[0.35, 0.55, 0.47, 0.94],
   response_fields = ["Doc"],
@@ -82,24 +86,24 @@ print(response)
 
 ## 6.Search without specific response field, then it will return all fields
 status_code, response = client.query(
-  table_name="MyTable",
+  table_name=table_name,
   query_field="Embedding",
   query_vector=[0.35, 0.55, 0.47, 0.94],
   limit=2
 )
 print(response)
 
 ## 7.Delete records by primary_keys (and filter)
-status_code, response =  client.delete(table_name="MyTable", primary_keys=[3, 4])
-status_code, response =  client.delete(table_name="MyTable", filter="Doc <> 'San Francisco'")
+status_code, response =  client.delete(table_name=table_name, primary_keys=[3, 4])
+status_code, response =  client.delete(table_name=table_name, filter="Doc <> 'San Francisco'")
 print(response)
 
 
 ## 8.Drop a table
-client.drop_table("MyTable")
+client.drop_table(table_name)
 
 ## 9.Unload a database from memory
-client.unload_db("MyDB")
+client.unload_db(db_name)
 ```