昆明网站建设推荐q479185700上墙怎么优化标题和关键词排名

一、安装

第一步，在你的项目中找到解决方案，右键-管理解决方案的Nuget

第二步，下载对应的包，注意你的框架是哪个就下载哪个的包，一个项目安装一次包即可

点击应用和确定

安装好后会显示sqlsugar的包

二、使用：增删改查

using SqlSugar;
using SqlSugar;
using System.Diagnostics.CodeAnalysis;
using System.Reflection;[SugarTable("TestTable")] // 指定实体类对应的数据库表名
class TestTable
{[SugarColumn(IsPrimaryKey = true)] // 指定主键列public string Id { get; set; }public string Name { get; set; }public int Age { get; set; }public string Content { get; set; }public int IsEnable { get; set; }public int IsDeleted { get; set; }public string Stage { get; set; }public string Remarks { get; set; }
}class Test
{public static int AddOrUpdate<T>(SqlSugarClient db,T entity) where T : class, new(){var entityIdProp = GetEntityIdProperty<T>();var entityIdValue = entityIdProp.GetValue(entity);var dbEntity = db.Queryable<T>().InSingle(entityIdValue);if (dbEntity != null){// 根据 ID 查询到了记录，执行更新操作return db.Updateable(entity).ExecuteCommand();}else{// 根据 ID 没有查询到记录，执行插入操作return db.Insertable(entity).ExecuteCommand();}}public static PropertyInfo GetEntityIdProperty<T>() where T : class, new(){var entityType = typeof(T);var properties = entityType.GetProperties();foreach (var property in properties){var attribute = Attribute.GetCustomAttribute(property, typeof(SqlSugar.SugarColumn)) as SqlSugar.SugarColumn;if (attribute != null && attribute.IsPrimaryKey){return property;}}throw new Exception($"实体类型 {entityType.FullName} 没有定义主键");}static void Main(string[] args){// 创建 SqlSugar 实例SqlSugarClient db = new SqlSugarClient(new ConnectionConfig(){ConnectionString = "server = DESKTOP-FTH2P3S; Database = TestDb; Trusted_Connection = SSPI;", // 数据库连接字符串DbType = DbType.SqlServer, // 数据库类型IsAutoCloseConnection = true, // 是否自动关闭数据库连接});// 1.插入数据var model = new TestTable(){Id = Guid.NewGuid().ToString(),Name = "Tom",Age = 18,Content = "Hello World",IsEnable = 1,IsDeleted = 0,Stage = "Stage 1",Remarks = "Test"};int insert_code = db.Insertable(model).ExecuteCommand();//返回影响行数// 2.查询数据var list = db.Queryable<TestTable>().ToList();// 3.自定义查询SQLvar result = db.SqlQueryable<TestTable>("SELECT * FROM TestTable WHERE Age > 30").ToList();// 4.更新数据var updateModel = db.Queryable<TestTable>().Where(it => it.Id == "8ffd64fc-8aea-4641-a57b-d957ad0dd229").First();if (updateModel != null){updateModel.Name = "Jerry";var update_code = db.Updateable(updateModel).ExecuteCommand();//返回影响行数}// 5.删除数据var delete_code = db.Deleteable<TestTable>().Where(it => it.Id == "8ffd64fc-8aea-4641-a57b-d957ad0dd229").ExecuteCommand();//返回影响行数//6.自主封装的方法，有则添加无则插入（根据主键ID匹配）var updateModel2 = new TestTable();updateModel2.Id = "8ffd64fc-8aea-4641-a57b-d957ad0dd229";updateModel2.Name = "SuSu";int a = AddOrUpdate<TestTable>(db, updateModel2);//返回影响行数}
}

【备注】AddOrUpdate是自己写的方法。