增加DB2数据库基础功能实现

Src/Asp.NetCore2/DB2CoreTest/CURD/CodeFirst.cs

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+using SqlSugar;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DB2CoreTest.CURD
+{
+    public class CodeFirst
+    {
+        public static void Init()
+        {
+            // 获取新的数据库实例
+            var db = DbHelper.GetNewDb();
+
+            // 如果数据库不存在，则创建数据库
+            //db.DbMaintenance.CreateDatabase();
+
+            //实体类初始化表
+            db.CodeFirst.InitTables<UserInfo>();
+
+            //实体类初始化表
+            db.CodeFirst.InitTables<UserLogins>();
+        }
+
+        public static void Insertable()
+        {
+            // 获取新的数据库实例
+            var db = DbHelper.GetNewDb();
+
+            //插入用户
+            var userId = db.Insertable(new UserInfo()
+            {
+                Context = "Context",
+                Email = "dfafa@qq.com",
+                Price = Convert.ToDecimal(1.1),
+                UserName = "admin",
+                RegistrationDate = DateTime.Now,
+
+            }).ExecuteReturnIdentity();
+
+            //插入用户登录
+            var loginId = db.Insertable(new UserLogins()
+            {
+                LoginTime = DateTime.Now,
+                UserId = userId,
+
+            }).ExecuteReturnIdentity();
+        }
+
+        public static void Queryable()
+        {
+            // 获取新的数据库实例
+            var db = DbHelper.GetNewDb();
+
+            //查询用户
+            var userInfo = db.Queryable<UserInfo>().ToList();
+
+            //查询用户登录
+            var userLogin = db.Queryable<UserLogins>().ToList();
+        }
+
+        public static void JoinQuery()
+        {
+            // 获取新的数据库实例
+            var db = DbHelper.GetNewDb();
+
+            var queryResult = db.Queryable<UserInfo, UserLogins>((ui, ul) => new JoinQueryInfos(JoinType.Inner, ui.UserId == ul.UserId)).Select((ui, ul) => new
+            {
+                ui.UserName,
+                ul.LoginTime,
+            }).ToList();
+        }
+
+        public static void PageQuery()
+        {
+            // 获取新的数据库实例
+            var db = DbHelper.GetNewDb();
+
+            //查询用户
+            var userList = db.Queryable<UserInfo>().ToPageList(2, 2);
+
+            var queryResult = db.Queryable<UserInfo, UserLogins>((ui, ul) => new JoinQueryInfos(JoinType.Inner, ui.UserId == ul.UserId)).Select((ui, ul) => new
+            {
+                ui.UserName,
+                ul.LoginTime,
+            }).ToPageList(2, 2);
+        }
+
+        public static void OrderBy()
+        {
+            // 获取新的数据库实例
+            var db = DbHelper.GetNewDb();
+
+            //查询用户
+            var userList = db.Queryable<UserInfo>().OrderBy(p => p.UserName).ToList();
+
+            var queryResult = db.Queryable<UserInfo, UserLogins>((ui, ul) => new JoinQueryInfos(JoinType.Inner, ui.UserId == ul.UserId)).Select((ui, ul) => new
+            {
+                ui.UserName,
+                ul.LoginTime,
+            }).OrderBy(ui => ui.UserName).ToList();
+        }
+
+        public static void GroupBy()
+        {
+            // 获取新的数据库实例
+            var db = DbHelper.GetNewDb();
+
+            //查询用户
+            var userList = db.Queryable<UserInfo>().GroupBy(p => p.Email).Select(p => new { UserId = SqlFunc.AggregateMax(p.UserId), p.Email, }).OrderBy(p => p.UserId).ToList();
+
+            var queryResult = db.Queryable<UserInfo, UserLogins>((ui, ul) => new JoinQueryInfos(JoinType.Inner, ui.UserId == ul.UserId)).GroupBy((ui, ul) =>
+            new
+            {
+                ui.UserName,
+            })
+            .Select((ui, ul) => new
+            {
+                UserId = SqlFunc.AggregateMax(ui.UserId),
+                ui.UserName,
+                LoginTime = SqlFunc.AggregateMax(ul.LoginTime),
+            }).OrderBy(ui => ui.UserName).ToList();
+        }
+
+        public static void Deleteable()
+        {
+            // 获取新的数据库实例
+            var db = DbHelper.GetNewDb();
+
+            //查询用户
+            var userList = db.Queryable<UserInfo>().ToList();
+            //删除用户
+            var deleteUserRet = db.Deleteable(userList).ExecuteCommand();
+
+            //查询用户登录
+            var userLoginList = db.Queryable<UserInfo>().ToList();
+            //删除用户登录
+            var deleteUserLoginRet = db.Deleteable(userLoginList).ExecuteCommand();
+        }
+    }
+
+    /// <summary>
+    /// 用户信息实体类
+    /// </summary> 
+    [SugarTable("USER_INFO", TableDescription = "用户信息")]
+    public class UserInfo
+    {
+        /// <summary>
+        /// 用户ID（主键）
+        /// </summary>
+        [SugarColumn(IsIdentity = true, IsPrimaryKey = true, ColumnDescription = "用户ID")]
+        public int UserId { get; set; }
+
+        /// <summary>
+        /// 用户名
+        /// </summary>
+        [SugarColumn(Length = 50, IsNullable = false, ColumnDescription = "用户名")]
+        public string UserName { get; set; }
+
+        /// <summary>
+        /// 用户邮箱
+        /// </summary>
+        [SugarColumn(IsNullable = true, ColumnDescription = "用户邮箱")]
+        public string Email { get; set; }
+
+        /// <summary>
+        /// 产品价格
+        /// </summary> 
+        [SugarColumn(ColumnDescription = "产品价格")]
+        public decimal Price { get; set; }
+
+        /// <summary>
+        /// 用户内容
+        /// </summary>
+        [SugarColumn(ColumnDataType = StaticConfig.CodeFirst_BigString, IsNullable = true, ColumnDescription = "用户内容")]
+        public string Context { get; set; }
+
+        /// <summary>
+        /// 用户注册日期
+        /// </summary>
+        [SugarColumn(IsNullable = true, ColumnDescription = "用户注册日期")]
+        public DateTime? RegistrationDate { get; set; }
+    }
+
+    /// <summary>
+    /// 用户登录实体类
+    /// </summary> 
+    [SugarTable("USER_LOGINS")]
+    public class UserLogins
+    {
+        /// <summary>
+        /// ID（主键）
+        /// </summary>
+        [SugarColumn(IsIdentity = true, IsPrimaryKey = true)]
+        public int Id { get; set; }
+
+        /// <summary>
+        /// 用户ID
+        /// </summary>
+        [SugarColumn(IsNullable = false)]
+        public int UserId { get; set; }
+
+        /// <summary>
+        /// 登录时间
+        /// </summary>
+        [SugarColumn(IsNullable = true)]
+        public DateTime LoginTime { get; set; }
+    }
+}