Use switch case instead of if else for connectionType.

oracle-plugin/src/main/java/io/cdap/plugin/oracle/OracleConstants.java

@@ -37,7 +37,7 @@ private OracleConstants() {
   public static final String CONNECTION_TYPE = "connectionType";
   public static final String ROLE = "role";
   public static final String NAME_DATABASE = "database";
-  public static final String TNS_CONNECTION_TYPE = "TNS";
+  public static final String TNS_CONNECTION_TYPE = "tns";
   public static final String TRANSACTION_ISOLATION_LEVEL = "transactionIsolationLevel";
   public static final String USE_SSL = "useSSL";
   public static final String DEFAULT_CONNECTION_PROTOCOL = "tcp";
@@ -90,15 +90,18 @@ public static String getConnectionString(String connectionType,
       connectionProtocol = "tcp";
     }
 
-    // For TNS Descriptor we can't specify the protocol in connection string.
-    if (OracleConstants.TNS_CONNECTION_TYPE.equalsIgnoreCase(connectionType)) {
-      return String.format(OracleConstants.ORACLE_CONNECTION_STRING_TNS_FORMAT, database);
-    }
-    if (OracleConstants.SERVICE_CONNECTION_TYPE.equalsIgnoreCase(connectionType)) {
-      return String.format(OracleConstants.ORACLE_CONNECTION_STRING_SERVICE_NAME_FORMAT,
-              connectionProtocol, host, port, database);
+    switch (connectionType.toLowerCase()) {
+      case OracleConstants.TNS_CONNECTION_TYPE:
+        // TNS connection doesn't require protocol
+        return String.format(OracleConstants.ORACLE_CONNECTION_STRING_TNS_FORMAT, database);
+      case OracleConstants.SERVICE_CONNECTION_TYPE:
+        // Service connection uses protocol, host, port, and database
+        return String.format(OracleConstants.ORACLE_CONNECTION_STRING_SERVICE_NAME_FORMAT,
+                connectionProtocol, host, port, database);
+      default:
+        // Default to SID format if no matching case is found
+        return String.format(OracleConstants.ORACLE_CONNECTION_STRING_SID_FORMAT,
+                connectionProtocol, host, port, database);
     }
-    return String.format(OracleConstants.ORACLE_CONNECTION_STRING_SID_FORMAT,
-            connectionProtocol, host, port, database);
   }
 }