20131209-数据库导入导出数据-sqlhelper-第十七天

[1]
导出数据

namespace _05导出数据

{

class
Program

{

static
void Main(string[] args)

{

string str = "Data Source=xy-pc;Initial Catalog=MyItcast;Integrated Security=True";

 

using (SqlConnection con=new
SqlConnection(str))

{

string sql = "select TClassId,TClassName,tclassdesc FROM TblClass";

using (SqlCommand cmd=new
SqlCommand(sql,con))

{

con.Open();

using (SqlDataReader sda=cmd.ExecuteReader())

{

if (sda.HasRows)

{

//把数据库中的文件写入到文本文件中去

using (StreamWriter sw=new
StreamWriter("1.txt"))

{

sw.WriteLine("{0},{1},{2}",sda.GetName(0),sda.GetName(1),sda.GetName(2));

while (sda.Read())

{

sw.WriteLine("{0},{1},{2}",sda["tclassid"],sda["tclassname"],sda["tclassdesc"]);

}

}

}

}

 

}

}

 

Console.WriteLine("搞定了");

Console.ReadKey();

}

}

}

 

[2]

namespace _06导入数据

{

class
Program

{

static
void Main(string[] args)

{

using (StreamReader sr=new
StreamReader("1.txt"))

{

string line = sr.ReadLine();//读取第一行内容

string str = "Data Source=xy-pc;Initial Catalog=MyItcast;Integrated Security=True";

using (SqlConnection con=new
SqlConnection(str))

{

string sql = "insert INTO TblClass(TClassName,TClassDesc)VALUES(@TClassName,@TClassDesc)";

using (SqlCommand cmd=new
SqlCommand(sql,con))

{

con.Open();//打开数据库

//设置每个参数的类型

SqlParameter[] param =

{

new
SqlParameter("@TClassName", System.Data.SqlDbType.NVarChar),

new
SqlParameter("@TClassDesc", System.Data.SqlDbType.NVarChar)

};

cmd.Parameters.AddRange(param);

while ((line=sr.ReadLine())!=null)

{

string[]txts= line.Split(',');

string className = txts[1];

string classDesc = txts[2];

//给数组中的每个参数进行赋值

param[0].Value = className;

param[1].Value = classDesc;

cmd.ExecuteNonQuery();

 

}//end while

 

}//end using

}//end using

 

}//end 流

 

 

 

Console.WriteLine( "执行完了");

Console.ReadKey();

}

}

}

[3]App.config

<?xml
version="1.0"
encoding="utf-8" ?>

<configuration>

 

<connectionStrings>

 

<add
connectionString="Data Source=xy-pc;Initial Catalog=MyItcast;Integrated Security=True"
name="strCon" />

</connectionStrings>

</configuration>

[4]

public
class
SQLHelper

{

private
static
readonly
string str = ConfigurationManager.ConnectionStrings["strCon"].ConnectionString;

 

///
<summary>

///
增删改方法

///
</summary>

///
<param name="sql">传sql语句</param>

///
<param name="param">如果sql语句带参数,则传参数,如果没有参数则不用传</param>

///
<returns></returns>

public
static
int ExeCuteNonQuery(string sql,params
SqlParameter[] param)

{

using (SqlConnection con=new
SqlConnection(str))

{

using (SqlCommand cmd=new
SqlCommand(sql,con))

{

con.Open();

if (param!=null)

{

cmd.Parameters.AddRange(param);//把用户传过来的参数给cmdparameters了

}

return cmd.ExecuteNonQuery();//完事

}

}

}

public
static
object ExecuteScalar(string sql,params
SqlParameter[]param)

{

using (SqlConnection con=new
SqlConnection(str))

{

using (SqlCommand cmd=new
SqlCommand(sql,con))

{

con.Open();

if (param!=null)

{

cmd.Parameters.AddRange(param);

}

return cmd.ExecuteScalar();

}

}

}

public
static
SqlDataReader ExecuteReader(string sql,params
SqlParameter[]param)

{

SqlConnection con = new
SqlConnection(str);

using (SqlCommand cmd=new
SqlCommand(sql,con))

{

if (param != null)

{

cmd.Parameters.AddRange(param);

}

try

{

con.Open();

return cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection);

}

catch(Exception ex)

{

con.Close();

con.Dispose();

throw ex;//有可能会出现异常,但是不确定异常是什么

 

}

 

}

}

 

}

}

[5]sql参数

string sql = "insert into tblstudent(tsname,tsgender,tsage,tclassid)values(@name,@gender,@age,@classid)";

SqlParameter[] param =

{

new
SqlParameter("@name",name),

new
SqlParameter("@gender",gender),

new
SqlParameter("@age",age),

new
SqlParameter("@classid",classid)

};