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动态操作

2881099 edited this page Aug 13, 2022 · 24 revisions

弱类型 CRUD

fsql.Insert<object>().AsType(实体类型)
  .AppendData(data)
  .ExecuteAffrows();

fsql.Update<object>().AsType(实体类型)
  .SetSource(data)
  .ExecuteAffrows();

fsql.Select<object>().AsType(实体类型)
  .Where(a => (a as BaseEntity).Id == 1)
  .ExecuteAffrows();

//或者仓储
var repo = fsql.GetRepository<object>();
repo.AsType(实体类型);

repo.Insert(..);
repo.Update(..);
repo.Delete(..);
repo.InsertOrUpdate(..);

字典 CUD

var dic = new Dictionary<string, object>();
dic.Add("id", 1);
dic.Add("name", "xxxx");

fsql.InsertDict(dic).AsTable("table1").ExecuteAffrows();
fsql.UpdateDict(dic).AsTable("table1").WherePrimary("id").ExecuteAffrows();
fsql.DeleteDict(dic).AsTable("table1").ExecuteAffrows();
fsql.InsertOrUpdateDict(dic).AsTable("table1").WherePrimary("id").ExecuteAffrows();

InsertDict/UpdateDict/DeleteDict/InsertOrUpdateDict 都支持批量操作,对应类型 List<Dictionary<string, object>>

动态条件

1、ISelect.Where(string sql) 使用原生条件:

fsql.Select<Region>().Where("a.id > 0") //提示:存在SQL注入安全问题

2、ISelect.WhereDynamicFilter 方法实现动态过滤条件(与前端交互),支持的操作符:

  • Contains/StartsWith/EndsWith/NotContains/NotStartsWith/NotEndsWith:包含/不包含,like '%xx%',或者 like 'xx%',或者 like '%xx'
  • Equal/NotEqual:等于/不等于
  • GreaterThan/GreaterThanOrEqual:大于/大于等于
  • LessThan/LessThanOrEqual:小于/小于等于
  • Range:范围查询
  • DateRange:日期范围,有特殊处理 value[1] + 1
  • Any/NotAny:是否符合 value 中任何一项(直白的说是 SQL IN)
  • Custom:自定义解析
DynamicFilterInfo dyfilter = JsonConvert.DeserializeObject<DynamicFilterInfo>(@"
{
    ""Logic"": ""And"",
    ""Filters"":
    [
        { ""Field"": ""id"", ""Operator"": ""Equals"", ""Value"": 1 },
        {
            ""Logic"": ""Or"",
            ""Filters"":
            [
                { ""Field"": ""id"", ""Operator"": ""Equals"", ""Value"": 2 },
                { ""Field"": ""id"", ""Operator"": ""Equals"", ""Value"": 3 }
            ]
        }
    ]
}");
fsql.Select<Region>().WhereDynamicFilter(dyfilter).ToList();
//WHERE id = 1 AND (id = 2 OR id = 3)

《高效理解 FreeSql WhereDynamicFilter,深入了解设计初衷》

动态排序

1、ISelect.OrderBy(string sql) 使用原生排序:

fsql.Select<Region>().OrderBy("a.id desc") //提示:存在SQL注入安全问题

2、ISelect.OrderByPropertyName 使用属性名排序:

  • 支持导航属性,比如 OrderByPropertyName("Parent.Code")
  • 支持多表查询,比如 OrderByPropertyName("b.Code")

动态贪婪加载

1、ISelect.IncludeByPropertyName 方法实现动态贪婪加载,对应 Include/IncludeMany:

fsql.Select<Region>()
    .IncludeByPropertyName("Parent.Parent.Parent") //ManyToOne/OneToOne
    .IncludeByPropertyName("Childs") //OneToMany/ManyToMany/PgArrayToMany

    .IncludeByPropertyName("Childs", then => then
        .IncludeByPropertyName("Parent.Parent")
        .IncludeByPropertyName("Parent.Childs")) //向下加载,可以向下 100 层
    .ToList();

2、List<TDto>.IncludeByPropertyName 扩展方法也实现了 OneToMany 动态贪婪加载:

var dtos = fsql.Select<Region>().ToList<Dto>();
//非实体类型,也可以级联加载,他们不需要配置导航属性关系

dtos.IncludeByPropertyName(
    orm: fsql, 
    property: "Childs", 
    where: "ParentId=Id", //临时关系
    take: 5, 
    select: "id,name",
    then => then.IncludeByPropertyName("Parent")
);

动态返回数据

1、ISelect.ToList 使用原生SQL返回数据:

List<(int, string)> list = fsql.Select<Region>()
    .ToList<(int, string)>("a.id,a.name") //提示:存在SQL注入安全问题

2、ISelect.ToDataTableByPropertyName 使用属性名返回数据:

DataTable dt = fsql.Select<Region>()
    .ToDataTableByPropertyName(new [] {
        "Parent.Code", //导航属性模式
        "b.Id" //多表查询模式
    });
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