public DatabaseBuilder withParam(@NotNull String key, @NotNull String val) {
      if (this.params == null) {
        this.params = new HashMap<>();
      }
      this.params.put(key, val);
      return this;
    }
Add a single database parameter.

@param key parameter key
@param val parameter value
@return this
standalone-metastore/metastore-tools/tools-common/src/main/java/org/apache/hadoop/hive/metastore/tools/Util.java