[Fix-1072][metadata] Fix invalid oracle validationQuery (#1078)

* [Fix-1072][metadata] Fix invalid oracle validationQuery

* fix checkstyle
Co-authored-by: wenmo <32723967+wenmo@users.noreply.github.com>

dlink-metadata/dlink-metadata-base/src/main/java/com/dlink/metadata/driver/AbstractJdbcDriver.java

@@ -120,7 +120,7 @@ public abstract class AbstractJdbcDriver extends AbstractDriver {
         return this;
     }
 
-    private void createDataSource(DruidDataSource ds, DriverConfig config) {
+    protected void createDataSource(DruidDataSource ds, DriverConfig config) {
         ds.setName(config.getName().replaceAll(":", ""));
         ds.setUrl(config.getUrl());
         ds.setDriverClassName(getDriverClass());

dlink-metadata/dlink-metadata-oracle/src/main/java/com/dlink/metadata/driver/OracleDriver.java

@@ -33,6 +33,8 @@ import java.util.List;
 import java.util.Map;
 import java.util.stream.Collectors;
 
+import com.alibaba.druid.pool.DruidDataSource;
+
 /**
  * OracleDriver
  *
@@ -129,4 +131,20 @@ public class OracleDriver extends AbstractJdbcDriver {
     public Map<String, String> getFlinkColumnTypeConversion() {
         return new HashMap<>();
     }
+
+    @Override
+    protected void createDataSource(DruidDataSource ds, DriverConfig config) {
+        ds.setName(config.getName().replaceAll(":", ""));
+        ds.setUrl(config.getUrl());
+        ds.setDriverClassName(getDriverClass());
+        ds.setUsername(config.getUsername());
+        ds.setPassword(config.getPassword());
+        ds.setValidationQuery("select 1 from dual");
+        ds.setTestWhileIdle(true);
+        ds.setBreakAfterAcquireFailure(true);
+        ds.setFailFast(true);
+        ds.setInitialSize(1);
+        ds.setMaxActive(8);
+        ds.setMinIdle(5);
+    }
 }