//1.创建compiled query NorthwindDataContext db = new NorthwindDataContext(); var fn = CompiledQuery.Compile( (NorthwindDataContext db2, string city) => from c in db2.Customers where c.City == city select c); //2.查询城市为London的消费者,用LonCusts集合表示,这时可以用数据控件绑定 var LonCu...
Console.WriteLine("list1:"+list1.ToJsonString());//分页方式2+符合查询 多where是and拼接Queryable<student> query2 = db.Queryable<student>(); query2= query2.Where(q => q.ssex =="男"); query2= query2.Where(q => q.sname.EndsWith("军"));//排序query2 = query2.OrderBy(q =>q....
步骤2:编写T-SQL查询语句 接下来,我们需要编写T-SQL查询语句来实现StartsWith。假设我们需要检查表"Customers"中的"Name"列是否以特定字符串开头。 # 编写T-SQL查询语句query="SELECT * FROM Customers WHERE Name LIKE 'search_string%'" 1. 2. 在上面的代码中,我们使用了LIKE运算符结合通配符“%”来定义Start...
ClassMethodPredicates1(){s q1="SELECT Name,Home_State FROM Sample.Person "s q2="WHERE Home_State IN('MA','VT','NH')"s myquery=q1 _ q2 s tStatement=##class(%SQL.Statement).%New()s qStatus=tStatement.%Prepare(myquery)ifqStatus '=1{w"%Prepare failed:"d $System.Status.DisplayErr...
Execute a SQL query limited support Execute a SQL query (V2) Not supported for on-premises SQL Server. General CRUD requirements Get row (V2) Get rows (V2) Update row (V2) Delete row (V2) String values will be trimmed in the case of Azure SQL instance usage. Therefore, blank strings ...
WITHRECURSIVEtree_pathAS(SELECTid,name,CAST(nameASVARCHAR(255))ASpathFROMcategoriesWHEREparent_idIS...
WHERE 条件; 值得注意的是:从书写格式角度看它出现在FROM子句之后,从程序的运行顺序角度看它在FROM子句之后,SELECT之前运行。 三、注释及SQL运行顺序 1.注释 SQL注释有两种,分别是单行注释和多行注释,相应的它们的书写方式也略有不同 (1)单行注释 -- 单行注释 ...
concatenating in the string and passing parameters with sp_executesql Concatenating inside EXEC Condition query to parameter only if parameter has "usable" value? CONDITIONAL failed because the following SET options have incorrect settings: 'ANSI_PADDING'. V Conditional If in Where Clause Conditional ...
BeginTransaction(String) Source: System.Data.SqlClient.notsupported.cs Starts a database transaction with the specified transaction name. C# 複製 public System.Data.SqlClient.SqlTransaction BeginTransaction (string transactionName); Parameters transactionName String The name of the transaction. ...
When the Query Optimizer creates statistics as a result of using the AUTO_CREATE_STATISTICS option, the statistics name starts with _WA. You can use the following query to determine if the Query Optimizer has created statistics for a query predicate column....