Only build sample db's if they don't exist yet.

examples/auth/auth.py

+import os
 from flask import Flask, url_for, redirect, render_template, request
 from flask.ext.sqlalchemy import SQLAlchemy
-
 from wtforms import form, fields, validators
-
 from flask.ext import admin, login
 from flask.ext.admin.contrib import sqla
 from flask.ext.admin import helpers, expose
 
+
 # Create Flask application
 app = Flask(__name__)
 
@@ -14,7 +14,8 @@ app = Flask(__name__)
 app.config['SECRET_KEY'] = '123456790'
 
 # Create in-memory database
-app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///sample.sqlite'
+app.config['DATABASE_FILE'] = 'sample_db.sqlite'
+app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///' + app.config['DATABASE_FILE']
 app.config['SQLALCHEMY_ECHO'] = True
 db = SQLAlchemy(app)
 
@@ -195,7 +196,11 @@ def build_sample_db():
 
 if __name__ == '__main__':
 
-    build_sample_db()
+    # Build a sample db on the fly, if one does not exist yet.
+    app_dir = op.realpath(os.path.dirname(__file__))
+    database_path = op.join(app_dir, app.config['DATABASE_FILE'])
+    if not os.path.exists(database_path):
+        build_sample_db()
 
     # Start app
     app.run(debug=True)

examples/forms/simple.py

@@ -19,7 +19,8 @@ app = Flask(__name__, static_folder='files')
 app.config['SECRET_KEY'] = '123456790'
 
 # Create in-memory database
-app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///sample.sqlite'
+app.config['DATABASE_FILE'] = 'sample_db.sqlite'
+app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///' + app.config['DATABASE_FILE']
 app.config['SQLALCHEMY_ECHO'] = True
 db = SQLAlchemy(app)
 
@@ -241,7 +242,11 @@ def build_sample_db():
 
 if __name__ == '__main__':
 
-    build_sample_db()
+    # Build a sample db on the fly, if one does not exist yet.
+    app_dir = op.realpath(os.path.dirname(__file__))
+    database_path = op.join(app_dir, app.config['DATABASE_FILE'])
+    if not os.path.exists(database_path):
+        build_sample_db()
 
     # Start app
     app.run(debug=True)
\ No newline at end of file

examples/layout/simple.py

+import os
 from flask import Flask
 from flask.ext.sqlalchemy import SQLAlchemy
 
-from flask.ext import admin, wtf
+from flask.ext import admin
 from flask.ext.admin.contrib.sqla import ModelView
 
+
 # Create application
 app = Flask(__name__)
 
@@ -11,7 +13,8 @@ app = Flask(__name__)
 app.config['SECRET_KEY'] = '123456790'
 
 # Create in-memory database
-app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///sample_db.sqlite'
+app.config['DATABASE_FILE'] = 'sample_db.sqlite'
+app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///' + app.config['DATABASE_FILE']
 app.config['SQLALCHEMY_ECHO'] = True
 db = SQLAlchemy(app)
 
@@ -135,7 +138,11 @@ def build_sample_db():
 
 if __name__ == '__main__':
 
-    build_sample_db()
+    # Build a sample db on the fly, if one does not exist yet.
+    app_dir = op.realpath(os.path.dirname(__file__))
+    database_path = op.join(app_dir, app.config['DATABASE_FILE'])
+    if not os.path.exists(database_path):
+        build_sample_db()
 
     # Start app
     app.run(debug=True)

examples/sqla/simple.py

+import os
 from flask import Flask
 from flask.ext.sqlalchemy import SQLAlchemy
 
@@ -7,7 +8,6 @@ from flask.ext import admin
 from flask.ext.admin.contrib import sqla
 from flask.ext.admin.contrib.sqla import filters
 
-from flask.ext import wtf
 
 # Create application
 app = Flask(__name__)
@@ -16,7 +16,8 @@ app = Flask(__name__)
 app.config['SECRET_KEY'] = '123456790'
 
 # Create in-memory database
-app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///sample_db.sqlite'
+app.config['DATABASE_FILE'] = 'sample_db.sqlite'
+app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///' + app.config['DATABASE_FILE']
 app.config['SQLALCHEMY_ECHO'] = True
 db = SQLAlchemy(app)
 
@@ -261,7 +262,11 @@ def build_sample_db():
 
 if __name__ == '__main__':
 
-    build_sample_db()
+    # Build a sample db on the fly, if one does not exist yet.
+    app_dir = op.realpath(os.path.dirname(__file__))
+    database_path = op.join(app_dir, app.config['DATABASE_FILE'])
+    if not os.path.exists(database_path):
+        build_sample_db()
 
     # Start app
     app.run(debug=True)