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数据库的查询分析器中写上如下代码：
ccreate 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：
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:
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：
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
---------------------------------------------
1 long
2 long
3 long
4 long
5 long
6 chao
7 chao
原文地址：https://www.cnblogs.com/simple-article/p/9576423.html