Drop support for MySQL < 8.0

MySQL 5.7 reached end-of-life in October 2023. This change:
- Removes version checks and legacy SQL syntax for MySQL < 8.0
- Simplifies admin.py password change to use only ALTER USER
- Simplifies test fixtures by removing conditional user creation
- Updates documentation links from MySQL 5.7 to 8.0 docs

Author: claude

datajoint/admin.py

@@ -2,7 +2,6 @@
 from getpass import getpass
 
 import pymysql
-from packaging import version
 
 from .connection import conn
 from .settings import config
@@ -20,13 +19,7 @@ def set_password(new_password=None, connection=None, update_config=None):
             logger.warning("Failed to confirm the password! Aborting password change.")
             return
 
-    if version.parse(
-        connection.query("select @@version;").fetchone()[0]
-    ) >= version.parse("5.7"):
-        # SET PASSWORD is deprecated as of MySQL 5.7 and removed in 8+
-        connection.query("ALTER USER user() IDENTIFIED BY '%s';" % new_password)
-    else:
-        connection.query("SET PASSWORD = PASSWORD('%s')" % new_password)
+    connection.query("ALTER USER user() IDENTIFIED BY '%s';" % new_password)
     logger.info("Password updated.")
 
     if update_config or (

datajoint/connection.py

@@ -90,7 +90,7 @@ def conn(
     :param reset: whether the connection should be reset or not
     :param use_tls: TLS encryption option. Valid options are: True (required), False
         (required no TLS), None (TLS preferred, default), dict (Manually specify values per
-        https://dev.mysql.com/doc/refman/5.7/en/connection-options.html#encrypted-connection-options).
+        https://dev.mysql.com/doc/refman/8.0/en/connection-options.html#encrypted-connection-options).
     """
     if not hasattr(conn, "connection") or reset:
         host = host if host is not None else config["database.host"]

docs/src/query/fetch.md

@@ -88,7 +88,7 @@ data = query.fetch(order_by='`select` desc')
 ```
 
 The `order_by` value is eventually passed to the `ORDER BY`
-[clause](https://dev.mysql.com/doc/refman/5.7/en/order-by-optimization.html).
+[clause](https://dev.mysql.com/doc/refman/8.0/en/order-by-optimization.html).
 
 Similarly, the `limit` and `offset` arguments can be used to limit the result to a
 subset of entities.

docs/src/query/operators.md

@@ -138,7 +138,7 @@ could contain all personnel. A project table references one person for the lead
 another the coordinator, both referencing the common personnel pool.
 
 3. Projection can also perform calculations (as available in
-[MySQL](https://dev.mysql.com/doc/refman/5.7/en/functions.html)) on a single attribute.
+[MySQL](https://dev.mysql.com/doc/refman/8.0/en/functions.html)) on a single attribute.
 
 ## Aggr
 

docs/src/quick-start.md

@@ -416,7 +416,7 @@ data = query.fetch(order_by='`select` desc')
 ```
 
 The `order_by` value is eventually passed to the `ORDER BY`
-[clause](https://dev.mysql.com/doc/refman/5.7/en/order-by-optimization.html).
+[clause](https://dev.mysql.com/doc/refman/8.0/en/order-by-optimization.html).
 
 ### Limiting results
 

tests/conftest.py

@@ -10,7 +10,6 @@
 import networkx as nx
 import pytest
 import urllib3
-from packaging import version
 
 import datajoint as dj
 from datajoint import errors
@@ -85,51 +84,28 @@ def connection_root(connection_root_bare, prefix):
     dj.config["safemode"] = False
     conn_root = connection_root_bare
     # Create MySQL users
-    if version.parse(
-        conn_root.query("select @@version;").fetchone()[0]
-    ) >= version.parse("8.0.0"):
-        # create user if necessary on mysql8
-        conn_root.query(
-            """
-                CREATE USER IF NOT EXISTS 'datajoint'@'%%'
-                IDENTIFIED BY 'datajoint';
-                """
-        )
-        conn_root.query(
-            """
-                CREATE USER IF NOT EXISTS 'djview'@'%%'
-                IDENTIFIED BY 'djview';
-                """
-        )
-        conn_root.query(
-            """
-                CREATE USER IF NOT EXISTS 'djssl'@'%%'
-                IDENTIFIED BY 'djssl'
-                REQUIRE SSL;
-                """
-        )
-        conn_root.query("GRANT ALL PRIVILEGES ON `djtest%%`.* TO 'datajoint'@'%%';")
-        conn_root.query("GRANT SELECT ON `djtest%%`.* TO 'djview'@'%%';")
-        conn_root.query("GRANT SELECT ON `djtest%%`.* TO 'djssl'@'%%';")
-    else:
-        # grant permissions. For MySQL 5.7 this also automatically creates user
-        # if not exists
-        conn_root.query(
-            """
-            GRANT ALL PRIVILEGES ON `djtest%%`.* TO 'datajoint'@'%%'
+    conn_root.query(
+        """
+            CREATE USER IF NOT EXISTS 'datajoint'@'%%'
             IDENTIFIED BY 'datajoint';
             """
-        )
-        conn_root.query(
-            "GRANT SELECT ON `djtest%%`.* TO 'djview'@'%%' IDENTIFIED BY 'djview';"
-        )
-        conn_root.query(
+    )
+    conn_root.query(
+        """
+            CREATE USER IF NOT EXISTS 'djview'@'%%'
+            IDENTIFIED BY 'djview';
             """
-            GRANT SELECT ON `djtest%%`.* TO 'djssl'@'%%'
+    )
+    conn_root.query(
+        """
+            CREATE USER IF NOT EXISTS 'djssl'@'%%'
             IDENTIFIED BY 'djssl'
             REQUIRE SSL;
             """
-        )
+    )
+    conn_root.query("GRANT ALL PRIVILEGES ON `djtest%%`.* TO 'datajoint'@'%%';")
+    conn_root.query("GRANT SELECT ON `djtest%%`.* TO 'djview'@'%%';")
+    conn_root.query("GRANT SELECT ON `djtest%%`.* TO 'djssl'@'%%';")
 
     yield conn_root
 
@@ -155,33 +131,19 @@ def connection_test(connection_root, prefix, db_creds_test):
     database = f"{prefix}%%"
     permission = "ALL PRIVILEGES"
 
-    # Create MySQL users
-    if version.parse(
-        connection_root.query("select @@version;").fetchone()[0]
-    ) >= version.parse("8.0.0"):
-        # create user if necessary on mysql8
-        connection_root.query(
-            f"""
-            CREATE USER IF NOT EXISTS '{db_creds_test["user"]}'@'%%'
-            IDENTIFIED BY '{db_creds_test["password"]}';
-            """
-        )
-        connection_root.query(
-            f"""
-            GRANT {permission} ON `{database}`.*
-            TO '{db_creds_test["user"]}'@'%%';
-            """
-        )
-    else:
-        # grant permissions. For MySQL 5.7 this also automatically creates user
-        # if not exists
-        connection_root.query(
-            f"""
-            GRANT {permission} ON `{database}`.*
-            TO '{db_creds_test["user"]}'@'%%'
-            IDENTIFIED BY '{db_creds_test["password"]}';
-            """
-        )
+    # Create MySQL user
+    connection_root.query(
+        f"""
+        CREATE USER IF NOT EXISTS '{db_creds_test["user"]}'@'%%'
+        IDENTIFIED BY '{db_creds_test["password"]}';
+        """
+    )
+    connection_root.query(
+        f"""
+        GRANT {permission} ON `{database}`.*
+        TO '{db_creds_test["user"]}'@'%%';
+        """
+    )
 
     connection = dj.Connection(**db_creds_test)
     yield connection