Confine SQL to cache class, not ChannelIndex (#164)

* move run_exports query into cache class

* add news

conda_index/index/__init__.py

@@ -1086,15 +1086,7 @@ def build_run_exports_data(self, subdir, verbose=False, progress=False):
         run_exports_conda_packages = {}
 
         # load cached packages
-        for row in cache.db.execute(
-            """
-            SELECT path, run_exports FROM stat
-            LEFT JOIN run_exports USING (path)
-            WHERE stat.stage = ?
-            ORDER BY path
-            """,
-            (cache.upstream_stage,),
-        ):
+        for row in cache.run_exports():
             path, run_exports_data = row
             run_exports_data = {"run_exports": json.loads(run_exports_data or "{}")}
             if path.endswith(CONDA_PACKAGE_EXTENSION_V1):

conda_index/index/sqlitecache.py

@@ -542,6 +542,21 @@ def store_index_json_stat(self, database_path, mtime, size, index_json):
             (database_path, mtime, size, index_json["sha256"], index_json["md5"]),
         )
 
+    def run_exports(self):
+        """
+        Query returning run_exports data, to be formatted by
+        ChannelIndex.build_run_exports_data()
+        """
+        return self.db.execute(
+            """
+            SELECT path, run_exports FROM stat
+            LEFT JOIN run_exports USING (path)
+            WHERE stat.stage = ?
+            ORDER BY path
+            """,
+            (self.upstream_stage,),
+        )
+
 
 def _cache_post_install_details(paths_json_str):
     post_install_details_json = {

news/163-cache-run-exports

@@ -0,0 +1,20 @@
+### Enhancements
+
+* <news item>
+
+### Bug fixes
+
+* Move `run_exports.json` query into cache, instead of directly using SQL in
+  `ChannelIndex`. (#163)
+
+### Deprecations
+
+* <news item>
+
+### Docs
+
+* <news item>
+
+### Other
+
+* <news item>