数据库的查询分析器中写上如下代码:
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create table studentname ( id int primary key identity(1,1) not null , name nvarchar(500) not null ) insert into studentname values ( 'long' ) insert into studentname values ( 'long' ) insert into studentname values ( 'long' ) insert into studentname values ( 'long' ) insert into studentname values ( 'long' ) insert into studentname values ( 'chao' ) insert into studentname values ( 'chao' ) |
--sql server 2012 通过。
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以下是第一种方法:
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using System.Data; using System.Data.SqlClient; string constr = "server=localhost;uid=sa;pwd=longshicheng;database=Student" ; SqlConnection conn = new SqlConnection(constr); SqlCommand cmd = new SqlCommand( "select * from studentname" , conn); conn. Open (); SqlDataReader rdr = cmd.ExecuteReader(); string makestr = "" ; DataTable table = new DataTable(); table . Load (rdr); //数据表装入 dataReader 。 string result= "" ; for ( int i = 0; i < table . Rows . Count ; i++) // 遍历行 { for ( int j = 0; j < table .Columns. Count ; j++) //遍历列 { result += table . Rows [i][j].ToString(); //逐行逐列显示每个单元格的数值。 } result += Environment.NewLine; //一行遍历完成就写入回车。 } txtlab.Text = result; /***************************************************************/ |
以下是第二种方法:
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string constr = "server=localhost;uid=sa;pwd=longshicheng;database=Student" ; SqlConnection conn = new SqlConnection(constr); SqlCommand cmd = new SqlCommand( "select * from studentname" , conn); conn. Open (); SqlDataReader rdr = cmd.ExecuteReader(); string makestr = "" ; for ( int k = 0; k < rdr.FieldCount; k++) //获取字段名称 { makestr += rdr.GetName(k) + "\t" ; //载入字段名称 } makestr += Environment.NewLine; //换行 makestr = makestr + "---------------------------------------------" +Environment.NewLine; while (rdr. Read ()) //逐行读取每一笔记录 { for ( int t = 0; t < rdr.FieldCount; t++) //逐列读出 { makestr = makestr + rdr[t].ToString() + "\t" ; //累加每一行,也就是逐个字段读出对应的数值 } makestr = makestr + Environment.NewLine; //又一行 } txtinfo.Text = makestr; rdr. Close (); //关闭 conn. Close (); } |
以下是第三种方法:
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string constr = "server=localhost;uid=sa;pwd=longshicheng;database=Student" ; SqlConnection conn = new SqlConnection(constr); SqlCommand cmd = new SqlCommand( "select * from studentname" , conn); conn. Open (); SqlDataReader rdr = cmd.ExecuteReader(); string makestr = "" ; for ( int k = 0; k < rdr.FieldCount; k++) //获取字段名称 { makestr += rdr.GetName(k) + "\t" ; //载入字段名称 } makestr += Environment.NewLine; //换行 makestr = makestr + "---------------------------------------------" + Environment.NewLine; while (rdr. Read ()) //逐行读取每一笔记录 { makestr = makestr + rdr.GetValue(0) + " \t" + rdr.GetValue(1).ToString() + "\t" ; makestr = makestr + Environment.NewLine; } txtother.Text = makestr; rdr. Close (); //关闭 conn. Close (); |
以上所有方法运行结果均如下:
id name
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1 long
2 long
3 long
4 long
5 long
6 chao
7 chao
总结
以上所述是小编给大家介绍的C#中sqlDataRead 的三种方式遍历读取各个字段数值的方法,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持!
原文链接:https://www.cnblogs.com/simple-article/p/9576423.html