[Feature] Add MySQL Loader (#920)

Co-authored-by: Deven Patel <deven298@yahoo.com>
Co-authored-by: Deshraj Yadav <deshrajdry@gmail.com>

embedchain/loaders/mysql.py

@@ -0,0 +1,64 @@
+import hashlib
+import logging
+from typing import Any, Dict, Optional
+
+from embedchain.loaders.base_loader import BaseLoader
+from embedchain.utils import clean_string
+
+
+class MySQLLoader(BaseLoader):
+    def __init__(self, config: Optional[Dict[str, Any]]):
+        super().__init__()
+        if not config:
+            raise ValueError(
+                f"Invalid sql config: {config}.",
+                "Provide the correct config, refer `https://docs.embedchain.ai/data-sources/mysql`.",
+            )
+
+        self.config = config
+        self.connection = None
+        self.cursor = None
+        self._setup_loader(config=config)
+
+    def _setup_loader(self, config: Dict[str, Any]):
+        try:
+            import mysql.connector as sqlconnector
+        except ImportError as e:
+            raise ImportError(
+                "Unable to import required packages for MySQL loader. Run `pip install --upgrade 'embedchain[mysql]'`."  # noqa: E501
+            ) from e
+
+        try:
+            self.connection = sqlconnector.connection.MySQLConnection(**config)
+            self.cursor = self.connection.cursor()
+        except (sqlconnector.Error, IOError) as err:
+            logging.info(f"Connection failed: {err}")
+            raise ValueError(
+                f"Unable to connect with the given config: {config}.",
+                "Please provide the correct configuration to load data from you MySQL DB. \
+                    Refer `https://docs.embedchain.ai/data-sources/mysql`.",
+            )
+
+    def _check_query(self, query):
+        if not isinstance(query, str):
+            raise ValueError(
+                f"Invalid mysql query: {query}",
+                "Provide the valid query to add from mysql, \
+                    make sure you are following `https://docs.embedchain.ai/data-sources/mysql`",
+            )
+
+    def load_data(self, query):
+        self._check_query(query=query)
+        data = []
+        data_content = []
+        self.cursor.execute(query)
+        rows = self.cursor.fetchall()
+        for row in rows:
+            doc_content = clean_string(str(row))
+            data.append({"content": doc_content, "meta_data": {"url": query}})
+            data_content.append(doc_content)
+        doc_id = hashlib.sha256((query + ", ".join(data_content)).encode()).hexdigest()
+        return {
+            "doc_id": doc_id,
+            "data": data,
+        }

embedchain/loaders/postgres.py

@@ -52,7 +52,7 @@ class PostgresLoader(BaseLoader):
             results = self.cursor.fetchall()
             for result in results:
                 doc_content = str(result)
-                data.append({"content": doc_content, "meta_data": {"url": f"postgres_query-({query})"}})
+                data.append({"content": doc_content, "meta_data": {"url": query}})
                 data_content.append(doc_content)
             doc_id = hashlib.sha256((query + ", ".join(data_content)).encode()).hexdigest()
             return {