新增方法

src/main/java/com/njcn/influx/query/InfluxQueryWrapper.java

@@ -238,6 +238,20 @@ public class InfluxQueryWrapper {
         return this;
     }
 
+    public <T, R> InfluxQueryWrapper count(String columnName,String resultName) {
+        String selectFragment = InfluxDbSqlConstant.COUNT +
+                InfluxDbSqlConstant.LBK +
+                InfluxDbSqlConstant.DQM +
+                columnName +
+                InfluxDbSqlConstant.DQM +
+                InfluxDbSqlConstant.RBK +
+                InfluxDbSqlConstant.AS +
+                resultName +
+                StrPool.C_SPACE;
+        selectColumns.add(selectFragment);
+        return this;
+    }
+
 
     /***
      * 统计平均值