微调

src/main/java/com/njcn/influx/constant/InfluxDbSqlConstant.java

@@ -61,6 +61,12 @@ public interface InfluxDbSqlConstant {
      */
     String ASC = StrPool.C_SPACE + "ASC" + StrPool.C_SPACE;
 
+    /**
+     * “LIMIT ”
+     */
+    String LIMIT = StrPool.C_SPACE + "LIMIT" + StrPool.C_SPACE;
+
+
 
     /**
      * " as value "

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

@@ -47,6 +47,10 @@ public class InfluxQueryWrapper {
      */
     private final List<String> orderColumn = new ArrayList<>();
 
+    /***
+     * LIMIT 子句，返回查询结果的前N条points
+     */
+    private String limitSql = "";
 
     /***
      * 查询目标表
@@ -1361,6 +1365,17 @@ public class InfluxQueryWrapper {
         return this;
     }
 
+    /***
+     * LIMIT 子句，返回查询结果的前N条points
+     * @author hongawen
+     * @return InfluxQueryWrapper
+     * 输出  limit 10
+     */
+    public InfluxQueryWrapper limit(int limit) {
+        limitSql = InfluxDbSqlConstant.LIMIT + limit;
+        return this;
+    }
+
 
     /***
      * 根据配置后的实体生成对应的sql
@@ -1414,6 +1429,11 @@ public class InfluxQueryWrapper {
                     .append(String.join(StrPool.COMMA, orderColumn));
         }
 
+        //判断是否有limit子句
+        if(StrUtil.isNotBlank(limitSql)){
+            sqlSelect.append(limitSql);
+        }
+
         //最后拼接上时区
         sqlSelect.append(InfluxDbSqlConstant.TZ);