terrymanu commented on a change in pull request #8928:
URL: https://github.com/apache/shardingsphere/pull/8928#discussion_r554704956



##########
File path: 
shardingsphere-proxy/shardingsphere-proxy-backend/src/main/java/org/apache/shardingsphere/proxy/backend/context/ProxyContext.java
##########
@@ -115,7 +116,13 @@ public ShardingSphereMetaData getMetaData(final String 
schemaName) {
         if (schemaNames.isEmpty()) {
             return Optional.empty();
         }
-        Map<String, DataSource> dataSources = 
getMetaData(schemaNames.get(0)).getResource().getDataSources();
-        return dataSources.values().stream().findFirst();
+        for (String schemaName : schemaNames) {
+            ShardingSphereResource shardingSphereResource = 
getMetaData(schemaName).getResource();
+            DatabaseType databaseType = 
shardingSphereResource.getDatabaseType();
+            if ("MySQL".equals(databaseType.getName())) {
+                return 
shardingSphereResource.getDataSources().values().stream().findFirst();
+            }

Review comment:
       The ProxyContext is public class which is in 
shardingsphere-proxy-backend module.
   The database dialect should in their own module, it is better to keep public 
modules independent, and let them do not know database dialect details.
   




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