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";

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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"]);

}

}

}

}

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}

}

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Console.WriteLine("搞定了");

Console.ReadKey();

}

}

}

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[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();

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}//end while

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}//end using

}//end using

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}//end 流

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Console.WriteLine( "执行完了");

Console.ReadKey();

}

}

}

[3]App.config

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

<configuration>

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<connectionStrings>

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<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;

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/// <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

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}

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}

}

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}

}

[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)

};