docs: add check for database (#79)

Author: averikitsch

samples/langchain_quick_start.ipynb

@@ -108,7 +108,6 @@
  },
  "outputs": [],
  "source": [
- "# TODO: Update this to install from Pypi\n",
  "%pip install --upgrade --quiet langchain-google-cloud-sql-pg langchain-google-vertexai langchain"
  ]
  },
@@ -290,7 +289,12 @@
  " !gcloud sql instances create {instance_name} --database-version=POSTGRES_15 \\\n",
  " --region={region} --cpu=1 --memory=4GB --root-password={password} \\\n",
  " --database-flags=cloudsql.iam_authentication=On\n",
- " !gcloud sql databases create {database_name} --instance={instance_name}\n"
+ " !gcloud sql databases create {database_name} --instance={instance_name}\n",
+ "\n",
+ "\n",
+ "databases = !gcloud sql databases list --instance={instance_name} --format=\"value(name)\"\n",
+ "if database_name not in databases:\n",
+ " !gcloud sql databases create {database_name} --instance={instance_name}"
  ]
  },
  {
@@ -989,7 +993,15 @@
  "name": "python3"
  },
  "language_info": {
+ "codemirror_mode": {
+ "name": "ipython",
+ "version": 3
+ },
+ "file_extension": ".py",
+ "mimetype": "text/x-python",
  "name": "python",
+ "nbconvert_exporter": "python",
+ "pygments_lexer": "ipython3",
  "version": "3.11.5"
  }
  },