[GitHub] [shardingsphere] TeslaCN commented on a diff in pull request #17611: Fix the exception when specifying schema when JDBC connects to Proxy

[GitBox <gi...@apache.org>]

TeslaCN commented on code in PR #17611:
URL: https://github.com/apache/shardingsphere/pull/17611#discussion_r876798582


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shardingsphere-proxy/shardingsphere-proxy-backend/src/main/java/org/apache/shardingsphere/proxy/backend/text/admin/mysql/MySQLAdminExecutorCreator.java:
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@@ -159,14 +159,12 @@ private boolean isQuerySpecialSchema(final SelectStatement sqlStatement, final S
     
     private DatabaseAdminExecutor mockExecutor(final String schemaName, final SelectStatement sqlStatement, final String sql) {
         boolean isNotUseSchema = !Optional.ofNullable(schemaName).isPresent() && sqlStatement.getFrom() == null;
+        if (!hasDatabases() || !hasResources()) {
+            return new NoResourceShowExecutor(sqlStatement);
+        }
+        String driverType = ProxyContext.getInstance().getContextManager().getMetaDataContexts().getProps().getValue(ConfigurationPropertyKey.PROXY_BACKEND_DRIVER_TYPE);

Review Comment:
   Getting driver type can be moved into `if (isNotUseSchema)` block to reduce unnecessary overhead since `isNotUseSchema` is not always `true`.



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