问在SQl服务器中使用contains关键字从字符串数组构建where子句EN数据库优化: 1.可以在单个SQL语句，整个...
string.IsNullOrEmpty(name), it => it.Name.Contains(name)).WhereIF(id>0, it => it.Id==id).ToList();7、根据Class查询,根据实查询 var getAll = db.Queryable<Order>().WhereClass(new Order() { Name="a"},ignoreDefaultValue:true).ToList();//单个实体 var getAll = db.Queryable<Order>...
问使用WHERE CONTAINS数字搜索SQL数据库EN1：查询user_id等于1 的数据 Select * from user where user_...
string.IsNullOrEmpty(username)) { query = query.Where(b => b.UserName.Contains(username)); ...
object>GetDbParamter()=> dbParameters;//////将表达式树解析为数据查询语句//////<typeparam name="TSource">实体</typeparam>///表达式树///<returns></returns>publicstringToSql<TSource>(Expression<Func<TSource,bool>> expression){stringresult =""; dbParameters.Clear();if(generateFullQuery) {s...
When you want to use data to limit the number of records that are returned in a query, you can use criteria. A query criterion is similar to a formula — it is a string that may consist of field references, operators, and constants. Query criteria are a type of expression. ...
将联接查询与SQL中的Where条件查询相结合 我有两个sql查询,如下所示,两个查询单独工作很好。 1. SELECT * FROM products WHERE isLive IS FALSE AND timeClose IS NULL AND ( timeOpen is NULL OR timeOpen <= 1 ) ORDER BY timeOpen ASC LIMIT 11;...
IList<Order> Search(string sqlQurey); 1. 结果进入另一个被“SQL注入”的时代(注:我大学时也有一段时间玩过“SQL注入”,不亦乐乎,现在基本上很少找到能够简单注入的网站了,有磨难就有前进的动力嘛 )。 来到Linq To SQL 的时代 (不得不赞叹Linq把查询发挥到淋漓尽致), 某些朋友就能轻易地挥洒Linq表达式来解...
直接使用 var result = list1.Where(str1 => list2.Contains(str))是不行的,这个要求两个list的string值必须有相等的才行 例如list1中有apple,那么list2中必须有apple才能匹配,而list2中只有app所以匹配不了 解决办法: List<string> list1 =newList<string> {"apple","banana","orange"}; ...
().Contains(c.version_id.ToString())) && c => DropDown3.KeyValue.ToString().Contains(c.status_id.ToString())); // I tried removing the second c=> but received an error "'c' is inaccessible due to its protection level" error and couldn't find an clear answer to how this related...