Excel报表开发

/// <summary>
/// 封装方法
/// </summary>
/// <param name="path"></param>
/// <returns></returns>
public DataSet gridview(string path)//path路径
{
//导入头                                                               //2003版的头

OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Extended Properties=\"Excel 8.0;\";Data Source=" + path);
conn.Open();
OleDbDataAdapter da = new OleDbDataAdapter("select * from [Sheet1$]", conn);
DataSet ds = new DataSet();
da.Fill(ds);
return ds;
}　

设置IMEX=1 时将强制混合数据转换为文本

Excel读取数据默认为8行 就推测每列的数据类型

解决方法 :
设置IMEX=1 时将强制混合数据转换为文本(不能根本解决,数据过大时)

修改注册表  修改注册表的Jet-->4.0-->Engines-->Excel的TypeGuessRows的值为0 (根本解决)

写入数据库:

public string how( string path)
{
OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Extended Properties=\"Excel 8.0;\";Data Source=" + path);
conn.Open();
OleDbDataAdapter da = new OleDbDataAdapter("select * from [Sheet1$]", conn);
DataSet ds = new DataSet();
da.Fill(ds);
string sql = string.Empty;
for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
{
sql += string.Format("insert into class values({0},'{1}','{2}','{3}')", ds.Tables[0].Rows[i][0].ToString(),ds.Tables[0].Rows[i][1].ToString(),ds.Tables[0].Rows[i][2].ToString(),ds.Tables[0].Rows[i][3].ToString());
}
int rowcount = SqlHelper.ExecuteNonQuery(sql);
if (rowcount > 0)
{
return "ok";
}
else
{
return "no";
}
}

private bool   showAdd( string path, string id)
{
string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + path + ";" + "Extended Properties=Excel 8.0;";
OleDbConnection conn = new OleDbConnection(strConn);
conn.Open();
System.Data.OleDb.OleDbCommand cmd = new OleDbCommand();
cmd.Connection = conn;
string sql;
if (id == null)
{
sql = string.Format("select * from class ");
}
else
{
sql = string.Format("select * from class where id =" + id);
}
DataSet ds = SqlHelper.ExecuteDataSet( sql,null );
int RowCount = ds.Tables[0].Rows.Count;
for (int j = 0; j < RowCount; j++)
{
string xh = ds.Tables[0].Rows[j][0].ToString();//学号
string xm = ds.Tables[0].Rows[j][1].ToString();//姓名
string xb = ds.Tables[0].Rows[j][2].ToString();//性别
string ca = ds.Tables[0].Rows[j][3].ToString();//班级
cmd.CommandText = "INSERT INTO [sheet1$](编号,姓名,性别,班级) VALUES('" + xh + "','" + xm + "','" + xb + "','"+ca+"')";
cmd.ExecuteNonQuery();
}
conn.Close();
cmd.Dispose();
return true;
}