使用结果映射将Dapper结果转换为字典可以通过以下步骤实现: 1. 首先,确保已经安装了Dapper库,并在项目中引入Dapper命名空间。 2. 在执行查询操作时,使用Dapper的Query...
Query方法可以执行原生 SQL 查询并且用一对多的关系映射结果到强类型集合 stringsql ="SELECT TOP 10 * FROM Orders AS A INNER JOIN OrderDetails AS B ON A.OrderID = B.OrderID;";using(varconnection =newSqlConnection(FiddleHelper.GetConnectionStringSqlServerW3Schools())) {varorderDictionary =newDictiona...
执行查询操作:使用Dapper的连接对象(例如SqlConnection)执行SQL查询语句,并将结果映射到对应的数据模型中。可以使用Dapper的Query方法来执行查询操作,并指定返回的结果类型。 以下是一个示例代码,演示如何使用Dapper查询具有一对多关系的对象: 代码语言:txt 复制
Query方法也是一个扩展方法,可以被IDbConnection对象调用,可以执行查询语句,并且映射到结果。 可以映射的类型: Anonymous(匿名类型 var) Strongly Typed(强类型) Multi-Mapping (One to One)(一对一映射) Multi-Mapping (One to Many)(一对多映射) Multi-Type(多类型) Query方法可使用的参数 Query方法参数说明 示例...
string sql="SELECT TOP 10 * FROM Orders AS A INNER JOIN OrderDetails AS B ON A.OrderID = B.OrderID;";using(varconnection=newSqlConnection(FiddleHelper.GetConnectionStringSqlServerW3Schools())){varorderDictionary=newDictionary<int,Order>();varlist=connection.Query<Order,OrderDetail,Order>(sql,...
If I have a simple query such as: string sql = "SELECT UniqueString, ID FROM Table"; and I want to map it to a dictionary object such as: Dictionary<string, int> myDictionary = new Dictionary<string, int>(); How would I do this with Dapper? I assume it is s...
sql = "select * from student";// where Id='916a84c6-85cb-4b41-b52a-96a0685d91b5'"; var sex = SqlMapper.Query<Dictionary<string, object>>(conn, sql, null).ToList(); 很简单的将结果转成 Dictionary ,它的委托实现如下: private static Func<IDataReader, object> GetDictionaryDeserializer(Ty...
stuList = db.Query("dbo.P_stuMarkInfo", //存储过程的名称 null, //存储过程的参数 null, //事务对象 true, //是否缓存 null, //获取或设置在终止执行命令的尝试并生成错误之间的等待时间 CommandType.StoredProcedure //指定的sql语句为存储过程类型 ).ToList(); ...
commandType = null) { Dictionary<TParentKey, TParent> cache = new Dictionary<TParentKey, TParent>(); connection.Query<TParent, TChild, TParent>( sql, (parent, child) => { if (!cache.ContainsKey(parentKeySelector(parent))) { cache.Add(parentKeySelector(parent), parent); } TParent ...
45 allRowsCount = connection.Query(innersql.ToString(), entityToPredicate).Count(); 46 Dictionary<string, object> parameters = new Dictionary<string, object>(); 47 string sql = GetFormatter(connection).GetPagingSql(innersql.ToString(), pageIndex, pageSize, parameters); ...