[SQLite] Add Case Sensitivity to LIKEs for SQLite

app/__init__.py

@@ -8,8 +8,11 @@
 from flask_sqlalchemy import SQLAlchemy
 from flask_wtf import CSRFProtect
 from flask_babel import Babel
+from sqlalchemy.engine import Engine
 from .ext_config import get_locale
 from .markdown_ext import Markdown
+from sqlite3 import Connection as SQLite3Connection
+
 
 basedir = os.path.abspath(os.path.dirname(__file__))
 
@@ -38,7 +41,15 @@ def create_app(config_name="dev"):
         app.config.from_object(config)
     else:
         app.config.from_object(config[config_name])
-
+
+    # SQLite does not perform CASE SENSITIVE LIKEs by default.
+    if app.config["SQLALCHEMY_DATABASE_URI"].startswith("sqlite:"):
+        @db.event.listens_for(Engine, "connect")
+        def _set_sqlite_case_insensitive_pragma(dbapi_con, connection_record):
+            """ This ensures that SQLite is not case-insensitive when using LIKEs"""
+            if isinstance(dbapi_con, SQLite3Connection):
+                dbapi_con.execute("PRAGMA case_sensitive_like=ON;")
+
     app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
 
     config[config_name].init_app(app)