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  • SqlSugar示例

    使用SqlSugar执行sql语句

    1.简单查询

     1 SqlSugarClient db = SugarContext.GetInstance();
     2 //执行sql语句,处理
     3 //1.执行sql,转成list
     4 List<teacher> list1 = db.SqlQuery<teacher>("select * from teacher where tsex=@tsex", new { tsex = "" });
     5 Console.WriteLine(list1.ToJsonString());
     6 //2.转成dynamic
     7 dynamic list2 = db.SqlQueryDynamic("select * from UserInfo");
     8 Console.WriteLine(list2.Length);
     9 //3.转成json数据
    10 string list3 = db.SqlQueryJson("select * from UserInfo");
    11 Console.WriteLine(list3);
    12 //4.返回int
    13 int count = db.SqlQuery<int>("select count(*) from UserInfo").FirstOrDefault();
    14 Console.WriteLine(count);
    15 
    16 //5.返回键值对类型
    17 Dictionary<string, string> list4 = db.SqlQuery<KeyValuePair<string, string>>("select UserID,Name from UserInfo")
    18     .ToDictionary(q => q.Key, q => q.Value);
    19 Console.WriteLine(list4.ToJsonString());
    20 
    21 //6.返回List<string[]> 集合
    22 List<string[]> list5 = db.SqlQuery<string[]>("select  * from teacher where tsex=@tsex", new { tsex = "" });
    23 Console.WriteLine(list5.ToJsonString());

    2.汇总查询

     1 SqlSugarClient db = SugarContext.GetInstance();
     2 //更方便的获取第一行第一列
     3 string result1 = db.GetString(" select  name from UserInfo where UserID=@UserID", new { UserID = 1 });
     4 Console.WriteLine(result1);
     5 int count = db.GetInt("select count(*) from UserInfo");
     6 Console.WriteLine(count);
     7 double result2 = db.GetDouble("select avg(degree) from score where cno=@cno ", new System.Data.SqlClient.SqlParameter("@cno", "3-105"));
     8 Console.WriteLine(result2);
     9 
    10 decimal result3 = db.GetDecimal(" select avg(degree) from score");
    11 Console.WriteLine(result3);

    3.执行视图、存储过程

     1 SqlSugarClient db = SugarContext.GetInstance();
     2 //执行视图查询
     3 List<student> list1 = db.SqlQuery<student>("select * from V_student");
     4 Console.WriteLine(list1.ToJsonString());
     5 //执行存储过程处理
     6 var pars = SqlSugarTool.GetParameters(new { pageStart = 1, pageEnd = 5, recordCount = 0 });
     7 //禁止清空参数
     8 db.IsClearParameters = false;
     9 pars[2].Direction = System.Data.ParameterDirection.Output;
    10 List<student> list2 = db.SqlQuery<student>("exec proc_PageStudent @pageStart,@pageEnd,@recordCount output", pars);
    11 db.IsClearParameters = true;//启用自动清空参数
    12 var recordCount = pars[2].Value;
    13 Console.WriteLine(list2.ToJsonString());
    14 Console.WriteLine(recordCount);
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  • 原文地址:https://www.cnblogs.com/lgx5/p/14606187.html
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