标签：model tar 时间 tor ati 结果 lex strong turn
查询方法（Query）是IDbConnection的扩展方法，它可以用来执行查询（select）并映射结果到C#实体（Model、Entity）类
查询结果可以映射成如下类型：
下面表格中显示了Query方法的不同参数
| 名称 | 描述 |
|---|---|
| sql |
要执行的sql语句文本 |
| param |
command的参数 |
| transaction |
事务 |
| buffered |
True to buffer readeing the results of the query (default = true). 翻译不来。。。 |
| commandTimeout |
command超时时间 |
| commandType |
command类型
|
Raw SQL query can be executed using Query method and map the result to a dynamic list.
直接执行SQL语句字符串，然后将结果映射成 dynamic类型的List中
string sql = "SELECT * FROM Invoice;"; using (var connection = My.ConnectionFactory()) { connection.Open(); var invoices = connection.Query(sql).ToList(); My.Result.Show(invoices); }
直接执行SQL语句字符串，然后将结果映射成强类型类型的List中
string sql = "SELECT * FROM Invoice;"; using (var connection = My.ConnectionFactory()) { connection.Open(); var invoices = connection.Query<Invoice>(sql).ToList(); My.Result.Show(invoices); }
Raw SQL query can be executed using Query method and map the result to a strongly typed list with a one to one relation.（没太理解）
直接执行SQL语句字符串，然后将结果用一对一的关系映射成强类型类型的List中
string sql = "SELECT * FROM Invoice AS A INNER JOIN InvoiceDetail AS B ON A.InvoiceID = B.InvoiceID;"; using (var connection = My.ConnectionFactory()) { connection.Open(); var invoices = connection.Query<Invoice, InvoiceDetail, Invoice>( sql, (invoice, invoiceDetail) => { invoice.InvoiceDetail = invoiceDetail; return invoice; }, splitOn: "InvoiceID") .Distinct() .ToList(); My.Result.Show(invoices); }
Raw SQL query can be executed using Query method and map the result to a strongly typed list with a one to many relations.
直接执行SQL语句字符串，然后将结果用一对多的关系映射成强类型类型的List中
string sql = "SELECT * FROM Invoice AS A INNER JOIN InvoiceItem AS B ON A.InvoiceID = B.InvoiceID;"; using (var connection = My.ConnectionFactory()) { connection.Open(); var invoiceDictionary = new Dictionary<int, Invoice>(); var invoices = connection.Query<Invoice, InvoiceItem, Invoice>( sql, (invoice, invoiceItem) => { Invoice invoiceEntry; if (!invoiceDictionary.TryGetValue(invoice.InvoiceID, out invoiceEntry)) { invoiceEntry = invoice; invoiceEntry.Items = new List<InvoiceItem>(); invoiceDictionary.Add(invoiceEntry.InvoiceID, invoiceEntry); } invoiceEntry.Items.Add(invoiceItem); return invoiceEntry; }, splitOn: "InvoiceID") .Distinct() .ToList(); My.Result.Show(invoices); }
Raw SQL query can be executed using Query method and map the result to a list of different types.
string sql = "SELECT * FROM Invoice;"; using (var connection = My.ConnectionFactory()) { connection.Open(); var invoices = new List<Invoice>(); using (var reader = connection.ExecuteReader(sql)) { var storeInvoiceParser = reader.GetRowParser<StoreInvoice>(); var webInvoiceParser = reader.GetRowParser<WebInvoice>(); while (reader.Read()) { Invoice invoice; switch ((InvoiceKind) reader.GetInt32(reader.GetOrdinal("Kind"))) { case InvoiceKind.StoreInvoice: invoice = storeInvoiceParser(reader); break; case InvoiceKind.WebInvoice: invoice = webInvoiceParser(reader); break; default: throw new Exception(ExceptionMessage.GeneralException); } invoices.Add(invoice); } } My.Result.Show(invoices); }
参考文章：
http://dapper-tutorial.net/query
标签：model tar 时间 tor ati 结果 lex strong turn
原文地址：http://www.cnblogs.com/rocketRobin/p/7298319.html
