C#中Dapper的使用教程
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2022-06-30 23:34:31
一、什么是dapper dapper是一款轻量级orm工具(github)。如果你在小的项目中,使用entity framework、nhibernate 来处理大数据访问及关系映射,未免有点杀鸡用...
一、什么是dapper
dapper是一款轻量级orm工具(github)。如果你在小的项目中,使用entity framework、nhibernate 来处理大数据访问及关系映射,未免有点杀鸡用牛刀。你又觉得orm省时省力,这时dapper 将是你不二的选择。
二、dapper的优点
- 轻量。只有一个文件sqlmapper.cs,编译后就40k的一个很小的dll.
- 速度快。dapper的速度接近与idatareader,取列表的数据超过了datatable。
- 支持多种数据库。dapper可以在所有ado.net providers下工作,包括sqlite, sqlce, firebird, oracle, mysql, postgresql and sql server
- 可以映射一对一,一对多,多对多等多种关系。
- 性能高。通过emit反射idatareader的序列队列,来快速的得到和产生对象,性能不错。
- 支持framework2.0,3.0,3.5,4.0,4.5
- dapper语法十分简单。并且无须迁就数据库的设计。
三、使用方法
1、添加nuget程序包dapper
2、配置文件添加连接数据库的字符串
<?xml version="1.0" encoding="utf-8"?> <configuration> <startup> <supportedruntime version="v4.0" sku=".netframework,version=v4.8"/> </startup> <connectionstrings> <add name="mystrconn" connectionstring="data source=(localdb)\mssqllocaldb;initial catalog=dhr_db;integrated security=true" /> </connectionstrings> </configuration>
3、添加dappertools.cs(添加、批量添加、删除、批量删除、修改、批量修改、查询、查询in的操作、多语句操作)
// <copyright file="dappertools.cs" company="placeholdercompany"> // copyright (c) placeholdercompany. all rights reserved. // </copyright> namespace csharpstudy { using system; using system.collections.generic; using system.configuration; using system.data; using system.data.sqlclient; using system.linq; using system.text; using system.threading.tasks; using dapper; internal class dappertools { public static string connectionstring = configurationmanager.connectionstrings["mystrconn"].connectionstring; /// <summary> /// 添加. /// </summary> /// <typeparam name="t">实体类型.</typeparam> /// <param name="sql">传入sql执行语句.</param> /// <param name="t">传入实体类型.</param> /// <returns>int.</returns> public static int add<t>(string sql, t t) where t : class { using (idbconnection connection = new sqlconnection(connectionstring)) { return connection.execute(sql, t); } } /// <summary> /// 批量添加. /// </summary> /// <typeparam name="t">实体类型.</typeparam> /// <param name="sql">传入sql执行语句.</param> /// <param name="t">传入泛型类.</param> /// <returns>int.</returns> public static int add<t>(string sql, list<t> t) where t : class { using (idbconnection connection = new sqlconnection(connectionstring)) { return connection.execute(sql, t); } } /// <summary> /// 删除. /// </summary> /// <typeparam name="t">实体类型.</typeparam> /// <param name="sql">传入sql执行语句.</param> /// <param name="t">传入实体类型.</param> /// <returns>int.</returns> public static int delete<t>(string sql, t t) where t : class { using (idbconnection connection = new sqlconnection(connectionstring)) { return connection.execute(sql, t); } } /// <summary> /// 批量删除. /// </summary> /// <typeparam name="t">实体类型.</typeparam> /// <param name="sql">传入sql执行语句.</param> /// <param name="t">传入泛型类.</param> /// <returns>int.</returns> public static int delete<t>(string sql, list<t> t) where t : class { using (idbconnection connection = new sqlconnection(connectionstring)) { return connection.execute(sql, t); } } /// <summary> /// 修改. /// </summary> /// <typeparam name="t">实体类型.</typeparam> /// <param name="sql">传入sql执行语句.</param> /// <param name="t">传入实体类型.</param> /// <returns>int.</returns> public static int update<t>(string sql, t t) where t : class { using (idbconnection connection = new sqlconnection(connectionstring)) { return connection.execute(sql, t); } } /// <summary> /// 批量修改. /// </summary> /// <typeparam name="t">实体类型.</typeparam> /// <param name="sql">传入sql执行语句.</param> /// <param name="t">传入泛型类.</param> /// <returns>int.</returns> public static int update<t>(string sql, list<t> t) where t : class { using (idbconnection connection = new sqlconnection(connectionstring)) { return connection.execute(sql, t); } } /// <summary> /// 查询. /// </summary> /// <typeparam name="t">实体类型.</typeparam> /// <param name="sql">传入sql执行语句.</param> /// <returns>泛型类.</returns> public static list<t> query<t>(string sql) where t : class { using (idbconnection connection = new sqlconnection(connectionstring)) { return connection.query<t>(sql).tolist(); } } /// <summary> /// 查询指定数据. /// </summary> /// <typeparam name="t">实体类型.</typeparam> /// <param name="sql">传入sql执行语句.</param> /// <param name="t">传入泛型类.</param> /// <returns>类.</returns> public static t query<t>(string sql, t t) where t : class { using (idbconnection connection = new sqlconnection(connectionstring)) { return connection.query<t>(sql, t).singleordefault(); } } /// <summary> /// 查询的in操作. /// </summary> /// <typeparam name="t">实体类型.</typeparam> /// <param name="sql">传入sql执行语句.</param> /// <returns>泛型类.</returns> public static list<t> query<t>(string sql, int[] ids) where t : class { using (idbconnection connection = new sqlconnection(connectionstring)) { return connection.query<t>(sql, new { ids }).tolist(); } } /// <summary> /// 多语句操作. /// </summary> /// <typeparam name="t">实体类型.</typeparam> /// <param name="sql">传入sql执行语句.</param> public static void querymultiple(string sql) { using (idbconnection connection = new sqlconnection(connectionstring)) { var multireader = connection.querymultiple(sql); var userinfo = multireader.read<userinfo>(); var student = multireader.read<student>(); multireader.dispose(); } } } }
4、添加测试类student.cs、userinfo。表数据自己添加
public class student { public int id { get; set; } public string name { get; set; } public int age { get; set; } public string memo { get; set; } public datetime createtime { get; set; } public datetime updatetime { get; set; } }
public class userinfo { public int id { get; set; } public string name { get; set; } public int age { get; set; } public string memo { get; set; } public datetime createtime { get; set; } public datetime updatetime { get; set; } }
5、调用方法
//----------------------------------------------------------------------- // <copyright file="program.cs" company="placeholdercompany"> // copyright (c) placeholdercompany. all rights reserved. // </copyright> // <author>john doe</author> //----------------------------------------------------------------------- namespace csharpstudy { using system; using system.collections.generic; using system.linq; using system.text; using system.threading.tasks; using dapper; internal class program { private static void main(string[] args) { // --------------添加-------------- // userinfo user = new userinfo(); // user.name = "九九"; // user.age = 10; // user.memo = "这是备注"; // user.createtime = datetime.now; // string sql = "insert into userinfo(name,age,memo,createtime) values (@name, @age, @memo,@createtime)"; // int result = dappertools.add<userinfo>(sql, user); // if (result > 0) // { // console.writeline("添加成功"); // console.readkey(); // } // --------------批量添加-------------- // userinfo user = new userinfo(); // user.name = "李奎"; // user.age = 50; // user.memo = "这是备注"; // user.createtime = datetime.now; // userinfo user2 = new userinfo(); // user2.name = "梁山伯"; // user2.age = 54; // user2.memo = "这是备注"; // user2.createtime = datetime.now; // list<userinfo> list = new list<userinfo>(); // list.add(user); // list.add(user2); // string sql = "insert into userinfo(name,age,memo,createtime) values (@name, @age, @memo,@createtime)"; // int result = dappertools.add<userinfo>(sql, list); // if (result > 0) // { // console.writeline("添加成功"); // console.readkey(); // } // --------------删除-------------- // userinfo user = new userinfo(); // user.id = 18; // string sql = "delete from userinfo where id=@id"; // int result = dappertools.delete<userinfo>(sql, user); // if (result > 0) // { // console.writeline("删除成功"); // console.readkey(); // } // --------------批量删除-------------- // userinfo user = new userinfo(); // user.id = 15; // userinfo user2 = new userinfo(); // user2.id = 16; // list<userinfo> list = new list<userinfo>(); // list.add(user); // list.add(user2); // string sql = "delete from userinfo where id=@id"; // int result = dappertools.delete<userinfo>(sql, list); // if (result > 0) // { // console.writeline("添加成功"); // console.readkey(); // } // --------------修改-------------- // userinfo user = new userinfo(); // user.id = 14; // user.name = "九九"; // string sql = "update userinfo set name=@name,updatetime=getdate() where id=@id"; // int result = dappertools.update<userinfo>(sql, user); // if (result > 0) // { // console.writeline("修改成功"); // console.readkey(); // } // --------------批量修改-------------- // userinfo user = new userinfo(); // user.id = 13; // user.name = "王文"; // userinfo user2 = new userinfo(); // user2.id = 14; // user2.name = "冰冰"; // list<userinfo> list = new list<userinfo>(); // list.add(user); // list.add(user2); // string sql = "update userinfo set name=@name,updatetime=getdate() where id=@id"; // int result = dappertools.update<userinfo>(sql, list); // if (result > 0) // { // console.writeline("修改成功"); // console.readkey(); // } // --------------查询-------------- // string sql = "select * from userinfo"; // list<userinfo> list = dappertools.query<userinfo>(sql); // foreach (var item in list) // { // console.writeline(item.id + "-" + item.name + "-" + item.age + "-" + item.memo); // } // console.readkey(); // --------------查询指定数据-------------- // userinfo user = new userinfo(); // user.id = 14; // string sql = "select * from userinfo where id=@id"; // userinfo userinfo = dappertools.query<userinfo>(sql, user); // console.writeline(userinfo.id + "-" + userinfo.name + "-" + userinfo.age + "-" + userinfo.memo); // console.readkey(); // --------------查询的in操作-------------- // string sql = "select * from userinfo where id in @ids"; // int[] ids = { 1, 2 }; // list<userinfo> list = dappertools.query<userinfo>(sql, ids); // foreach (var item in list) // { // console.writeline(item.id + "-" + item.name + "-" + item.age + "-" + item.memo); // } // --------------多语句操作-------------- // string sql = "select * from userinfo;select * from student"; // dappertools.querymultiple(sql); } } }
源代码:
链接: https://pan.baidu.com/s/1im3dicqjcospvr11h6zddq
提取码: 6ag9
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