Fix #18171: Change case of column names in SQL query for `findConstraints` to fix MySQL 8 compatibility

framework/CHANGELOG.md

@@ -4,7 +4,8 @@ Yii Framework 2 Change Log
 2.0.37 under development
 ------------------------
 
-Fix #18170: Fix regression in passing extra console command arguments to the action (darkdef)
+- Bug #18171: Change case of column names in SQL query for `findConstraints` to fix MySQL 8 compatibility (darkdef)
+- Bug #18170: Fix 2.0.36 regression in passing extra console command arguments to the action (darkdef)
 
 
 2.0.36 July 07, 2020

framework/db/mysql/Schema.php

@@ -370,20 +370,20 @@ SQL;
     {
         $sql = <<<'SQL'
 SELECT
-    kcu.constraint_name,
-    kcu.column_name,
-    kcu.referenced_table_name,
-    kcu.referenced_column_name
-FROM information_schema.referential_constraints AS rc
-JOIN information_schema.key_column_usage AS kcu ON
+    `kcu`.`CONSTRAINT_NAME` AS `constraint_name`,
+    `kcu`.`COLUMN_NAME` AS `column_name`,
+    `kcu`.`REFERENCED_TABLE_NAME` AS `referenced_table_name`,
+    `kcu`.`REFERENCED_COLUMN_NAME` AS `referenced_column_name`
+FROM `information_schema`.`REFERENTIAL_CONSTRAINTS` AS `rc`
+JOIN `information_schema`.`KEY_COLUMN_USAGE` AS `kcu` ON
     (
-        kcu.constraint_catalog = rc.constraint_catalog OR
-        (kcu.constraint_catalog IS NULL AND rc.constraint_catalog IS NULL)
+        `kcu`.`CONSTRAINT_CATALOG` = `rc`.`CONSTRAINT_CATALOG` OR
+        (`kcu`.`CONSTRAINT_CATALOG` IS NULL AND `rc`.`CONSTRAINT_CATALOG` IS NULL)
     ) AND
-    kcu.constraint_schema = rc.constraint_schema AND
-    kcu.constraint_name = rc.constraint_name
-WHERE rc.constraint_schema = database() AND kcu.table_schema = database()
-AND rc.table_name = :tableName AND kcu.table_name = :tableName1
+    `kcu`.`CONSTRAINT_SCHEMA` = `rc`.`CONSTRAINT_SCHEMA` AND
+    `kcu`.`CONSTRAINT_NAME` = `rc`.`CONSTRAINT_NAME`
+WHERE `rc`.`CONSTRAINT_SCHEMA` = database() AND `kcu`.`TABLE_SCHEMA` = database()
+AND `rc`.`TABLE_NAME` = :tableName AND `kcu`.`TABLE_NAME` = :tableName1
 SQL;
 
         try {