- 增加 ToDataTableByPropertyName 动态查询功能；

Author: 2881099

FreeSql.DbContext/FreeSql.DbContext.xml

@@ -9,6 +9,7 @@
 using System.Threading.Tasks;
 using System.Text;
 using Xunit;
+using FreeSql.Internal.CommonProvider;
 
 namespace FreeSql.Tests.Sqlite
 {
@@ -149,6 +150,7 @@ public void ToDataTable()
             var dt1 = select.Limit(10).ToDataTable();
             var dt2 = select.Limit(10).ToDataTable("id, 111222");
             var dt3 = select.Limit(10).ToDataTable(a => new { a.Id, a.Type.Name, now = DateTime.Now });
+            var dt4 = select.Limit(10).ToDataTableByPropertyName(new[] { "a.Id", "a.Type.Name", "Title", "clicks" });
         }
         class TestDto
         {
@@ -368,6 +370,9 @@ public void LeftJoin()
             var query = select.LeftJoin(a => a.Type.Guid == a.TypeGuid);
             var sql = query.ToSql().Replace("\r\n", "");
             Assert.Equal("SELECT a.\"Id\", a.\"Clicks\", a.\"TypeGuid\", a__Type.\"Guid\", a__Type.\"ParentId\", a__Type.\"Name\", a.\"Title\", a.\"CreateTime\" FROM \"tb_topic22\" a LEFT JOIN \"TestTypeInfo\" a__Type ON a__Type.\"Guid\" = a.\"TypeGuid\"", sql);
+            (query as Select0Provider)._tables.Where(a => a.Table.Type == typeof(TestTypeInfo))
+                .First()
+                .Type = SelectTableInfoType.InnerJoin; 
             query.ToList();
 
             query = select.LeftJoin(a => a.Type.Guid == a.TypeGuid && a.Type.Name == "xxx");

FreeSql.Tests/FreeSql.Tests/Sqlite/Curd/SqliteSelectTest.cs

@@ -72,6 +72,12 @@ public partial interface ISelect0<TSelect, T1> : ISelect0
         /// </summary>
         /// <returns></returns>
         DataTable ToDataTable(string field = null);
+        /// <summary>
+        /// 执行SQL查询，返回 properties 指定的实体类属性，并以 DataTable 接收
+        /// </summary>
+        /// <param name="properties">属性名：Name<para></para>导航属性：Parent.Name<para></para>多表：b.Name</param>
+        /// <returns></returns>
+        DataTable ToDataTableByPropertyName(string[] properties);
 
         /// <summary>
         /// 以字典的形式返回查询结果<para></para>

FreeSql/FreeSql.xml

@@ -19,6 +19,25 @@ namespace FreeSql.Internal.CommonProvider
 {
     partial class Select0Provider<TSelect, T1>
     {
+        public DataTable ToDataTableByPropertyName(string[] properties)
+        {
+            if (properties?.Any() != true) throw new ArgumentException($"properties 参数不能为空");
+            var sbfield = new StringBuilder();
+            for (var propIdx = 0; propIdx < properties.Length; propIdx++)
+            {
+                var property = properties[propIdx];
+                var exp = ConvertStringPropertyToExpression(property);
+                if (exp == null) throw new Exception($"{property} 属性名无法找到");
+                var field = _commonExpression.ExpressionSelectColumn_MemberAccess(_tables, null, SelectTableInfoType.From, exp, true, null);
+                if (propIdx > 0) sbfield.Append(", ");
+                sbfield.Append(field);
+                //if (field != property)
+                sbfield.Append(_commonUtils.FieldAsAlias(_commonUtils.QuoteSqlName("test").Replace("test", property)));
+            }
+            var sbfieldStr = sbfield.ToString();
+            sbfield.Clear();
+            return ToDataTable(sbfieldStr);
+        }
         public DataTable ToDataTable(string field = null)
         {
             DataTable ret = null;