1 files changed, 22 insertions, 0 deletions
diff --git a/qc_app/db/tissues.py b/qc_app/db/tissues.py
new file mode 100644
index 0000000..ebf24fd
--- /dev/null
+++ b/qc_app/db/tissues.py
@@ -0,0 +1,22 @@
+"""Handle db interactions for tissue."""
+from typing import Optional
+
+import MySQLdb as mdb
+from MySQLdb.cursors import DictCursor
+
+def all_tissues(conn: mdb.Connection) -> tuple[dict, ...]:
+    """All available tissue."""
+    with conn.cursor(cursorclass=DictCursor) as cursor:
+        cursor.execute("SELECT * FROM Tissue ORDER BY TissueName")
+        return tuple(dict(row) for row in cursor.fetchall())
+
+def tissue_by_id(conn: mdb.Connection, tissueid: int) -> Optional[dict]:
+    """Retrieve a tissue by its ID"""
+    with conn.cursor(cursorclass=DictCursor) as cursor:
+        cursor.execute("SELECT * FROM Tissue WHERE Id=%s",
+                       (tissueid,))
+        result = cursor.fetchone()
+        if bool(result):
+            return dict(result)
+
+    return None