using SqlSugar; using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using static OrmTest._8_Insert; namespace OrmTest { internal class _9_Update { /// /// 初始化更新方法(Initialize update methods) /// internal static void Init() { var db = DbHelper.GetNewDb(); // 初始化实体表格(Initialize entity tables) db.CodeFirst.InitTables(); // 创建一个需要更新的实体对象(Create an entity object to be updated) var updateObj = new StudentWithSnowflake() { Id = 1, Name = "order1" }; // 创建需要批量更新的实体对象列表(Create a list of entity objects to be updated in bulk) var updateObjs = new List { new StudentWithSnowflake() { Id = 11, Name = "order11", Date=DateTime.Now }, new StudentWithSnowflake() { Id = 12, Name = "order12", Date=DateTime.Now } }; /***************************根据实体更新 (Update based on entity)***************************/ // 更新单个实体对象(Update a single entity object) var result = db.Updateable(updateObj).ExecuteCommand(); // 批量更新实体对象列表(Update a list of entity objects in bulk) var result20 = db.Updateable(updateObjs).ExecuteCommand(); var result21 = db.Updateable(updateObjs).PageSize(500).ExecuteCommand(); // 更新实体对象,忽略指定列(Update entity object, ignoring specific columns) var result3 = db.Updateable(updateObj).IgnoreColumns(it => new { it.Remark }).ExecuteCommand(); // 更新实体对象的指定列(Update specific columns of the entity object) var result4 = db.Updateable(updateObj).UpdateColumns(it => new { it.Name, it.Date }).ExecuteCommand(); // 如果没有主键,按照指定列更新实体对象(If there is no primary key, update entity object based on specified columns) var result5 = db.Updateable(updateObj).WhereColumns(it => new { it.Id }).ExecuteCommand(); // 如果字段值为NULL,不进行更新(Do not update columns with NULL values) var result6 = db.Updateable(updateObj).IgnoreNullColumns().ExecuteCommand(); // 忽略为NULL和默认值的列进行更新(Ignore columns with NULL and default values during update) var result7 = db.Updateable(updateObj) .IgnoreColumns(ignoreAllNullColumns: true, ignoreAllDefaultValue:true) .ExecuteCommand(); // 使用最快的方式批量更新实体对象列表(Bulk update a list of entity objects using the fastest method) var result8 = db.Fastest().BulkUpdate(updateObjs); /***************************表达式更新 (Expression Update)***************************/ // 使用表达式更新实体对象的指定列(Update specific columns of the entity object using expressions) var result71 = db.Updateable() .SetColumns(it => new StudentWithSnowflake() { Name = "a", Date = DateTime.Now }) .Where(it => it.Id == 11) .ExecuteCommand(); // 使用表达式更新实体对象的指定列(Update specific columns of the entity object using expressions) var result81 = db.Updateable() .SetColumns(it => it.Name == "Name" + "1") .Where(it => it.Id == 1) .ExecuteCommand(); } // 实体类:带雪花主键(Entity class: With snowflake primary key) [SugarTable("StudentWithSnowflake09")] public class StudentWithSnowflake { [SugarColumn(IsPrimaryKey = true)] public long Id { get; set; } public string Name { get; set; } public DateTime Date { get; set; } [SugarColumn(IsNullable = true)] public string Remark { get; set; } } } }