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; }
}
}
}