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' )
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--sql server 2012 通过。
---------------------------------------------------------------------------------------------------
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;
/***************************************************************/
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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 ();
}
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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 ();
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以上所有方法运行结果均如下:
id name
---------------------------------------------
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