增加查询对象转换为查询SQL

Infrastructure/QueryObjExtension.cs

@@ -0,0 +1,51 @@
+using System.Linq;
+using System.Text;
+
+namespace Infrastructure;
+
+/// <summary>
+/// 查询对象FilterGroup扩展，将对象转换为sql查询
+/// </summary>
+public static class QueryObjExtension
+{
+    /// <summary>
+    /// 根据过滤器组构建查询。
+    /// </summary>
+    public static string BuildQuery(this FilterGroup query)
+    {
+        StringBuilder sb = new StringBuilder();
+        BuildQuery(query, sb);
+        return sb.ToString();
+    }
+
+    /// <summary>
+    /// 递归构建查询字符串。
+    /// </summary>
+    private static void BuildQuery(FilterGroup query, StringBuilder sb)
+    {
+        // 构建当前过滤器组的过滤条件
+        if (query.Filters != null && query.Filters.Length > 0)
+        {
+            string filters = string.Join($" {query.Operation} ", query.Filters.Select(f => $"{f.Key} {f.Contrast} '{f.Value}'"));
+            sb.Append($"({filters})");
+        }
+
+        // 构建当前过滤器组的子过滤器组
+        if (query.Children != null && query.Children.Length > 0)
+        {
+            // 如果当前字符串不为空，则添加操作符连接子过滤器组
+            if (sb.Length > 0)
+            {
+                sb.Append($" {query.Operation} ");
+            }
+            // 使用递归方式构建子过滤器组的查询字符串，并连接到当前字符串
+            string children = string.Join($" {query.Operation} ", query.Children.Select(child =>
+            {
+                StringBuilder childSb = new StringBuilder();
+                BuildQuery(child, childSb);
+                return childSb.ToString();
+            }));
+            sb.Append($"({children})");
+        }
+    }
+}