WinFrm导出数据到dbf文件
1.在写程序之前，先说明下dbf文件的特性以及保存时遇到的问题，以此来供大家参考！
（1）如果要在程序中新创建DBF文件，要导出列不能太多，否则创建不成功，即提示：字段将不能置于记录中；
注：和数据的多少无关（dbf文件 多个(32)个长字段(200)，创建时即报错）
（2）在已知的dbf表中插入数据，dbf文件名即就是表名(包括后缀)；文件名（不包含后缀）不能太长，最好改至8个字符以内，否则无法插入时无法识别该表
2.程序功能
（1）根据时间和选择条件从Oracle数据库查询出数据，显示到GridView视图上
（2）点击导出按钮，支持创建新的DBF文件和插入已有DBF文件两种格式，将数据导成DBF格式的文件
3.代码详解
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
DataTable dt = new DataTable();
private void btSearch_Click(object sender, EventArgs e)
{
if (dtpEndTime.Value.CompareTo(this.dtpStartTime.Value) == -1)
{
MessageBox.Show("开始时间应该小于结束时间!","提示", MessageBoxButtons.OKCancel,
MessageBoxIcon.Warning);
return;
}
string startime = DateTimeToString(dtpStartTime.Value.Year, dtpStartTime.Value.Month.ToString(), dtpStartTime.Value.Day.ToString());
string endtime = DateTimeToString(dtpEndTime.Value.Year,dtpEndTime.Value.Month.ToString(),dtpEndTime.Value.Day.ToString());
string connStr = "Data Source=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=xxx.xxx.x.xx)(PORT=1521)) (CONNECT_DATA=(SERVICE_NAME=ORCL)));User ID= ;Password= ;";
try
{
OracleConnection oracleStr = new OracleConnection(connStr);
string sql = null;
if (RadioButton_XY.Checked == true)
{
sql = string.Format("Select * From viewortablename where colunmname>='{0}' AND colunmname<='{1}'", startime, endtime);
}
else
{
sql = string.Format("Select * From viewortablename where colunmname>='{0}' AND colunmname<='{1}'", startime, endtime);
}
OracleCommand oc1 = new OracleCommand(sql, oracleStr);
//OracleCommand oc1 = new OracleCommand("select * from amsh_abnormity where ourid = 201603225272877", oracleStr);
DataSet ds1 = new DataSet();
OracleDataAdapter da1 = new OracleDataAdapter();
da1.SelectCommand = oc1;
da1.Fill(ds1);
//通过展示数据列表的datasource属性与上述已填充数据的空器进行关联．记得空器可能包含多个表，要用dataset.tables[0],仅提取一个表
this.dataGridView.DataSource = ds1.Tables[0];
dt = ds1.Tables[0];
this.LB_AmountCount.Text = string.Format("总数据有{0}条",dt.Rows.Count);
this.LB_ExportCount.Text = string.Format("已导出0条");
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
private void btExport_Click(object sender, EventArgs e)
{
if (dataGridView.DataSource != null && (dataGridView.DataSource as DataTable).Rows.Count != 0)
{
DialogResult dr = MessageBox.Show("是否创建新的DBF文件？", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
if (dr == DialogResult.Yes)
{
#region 创建新的DBF导出方法,用于列较少的表
SaveFileDialog dlg = new SaveFileDialog();
dlg.Filter = "DBF文件(*.dbf)|*.dbf|BDF文件(*.dbf)|*.dbf";
dlg.FileName = "请指定文件名，且控制在8个字符内";
if (dlg.ShowDialog() == DialogResult.OK)
{
string fName = dlg.FileName;
FileInfo fi = new FileInfo(@dlg.FileName);
string mulu = fi.DirectoryName;
dt.TableName = fi.Name;
DbfExportHelper helper = new DbfExportHelper(@mulu);
if (helper.CreateNewTable(dt))
{
int insertcount = 0;
int count = 0;
this.progressBar1.Maximum = dt.Rows.Count;
foreach (DataRow row in dt.Rows)
{
if (!helper.batchfillData(dt, insertcount))
{
if (count > 0)
{
count--;
}
break;
}
count = insertcount++;
if (insertcount <= dt.Rows.Count)
{
//进度条控件
this.progressBar1.Value++;
}
else
{
this.progressBar1.Value = 0;
}
}
this.progressBar1.Value = 0;
this.LB_ExportCount.Text = string.Format("已导出{0}条", count + 1);
MessageBox.Show("导出完成！", "信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
#endregion
}
else
{
#region 通过FileDialog获取文件导出方法
OpenFileDialog dlg = new OpenFileDialog();
dlg.Filter = "DBF文件(*.dbf)|*.dbf|BDF文件(*.dbf)|*.dbf";
if (dlg.ShowDialog() == DialogResult.OK)
{
string fName = dlg.FileName;
FileInfo fi = new FileInfo(@dlg.FileName);
string mulu = fi.DirectoryName;
dt.TableName = fi.Name;
DbfExportHelper helper = new DbfExportHelper(@mulu);
int j = helper.GetDBFColumnData(fi.Name);
if(j==0)
{
if (helper.DeleteDbfData(dt.TableName))
{
int insertcount=0;
int count = 0;
this.progressBar1.Maximum = dt.Rows.Count;
foreach (DataRow row in dt.Rows)
{
if (!helper.batchfillData(dt, insertcount))
{
if (count > 0)
{
count--;
}
break;
}
count = insertcount++;
if (insertcount <= dt.Rows.Count)
{
this.progressBar1.Value++;
}
else
{
this.progressBar1.Value = 0;
}
}
this.progressBar1.Value = 0;
this.LB_ExportCount.Text = string.Format("已导出{0}条", count + 1);
MessageBox.Show("导出完成！", "信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
else if (j== 1)
{
int insertcount = 0;
int count = 0;
this.progressBar1.Maximum = dt.Rows.Count;
foreach (DataRow row in dt.Rows)
{
if (!helper.batchfillData(dt, insertcount))
{
if (count > 0)
{
count--;
}
break;
}
count = insertcount++;
if (insertcount <= dt.Rows.Count)
{
this.progressBar1.Value++;
}
else
{
this.progressBar1.Value = 0;
}
}
this.progressBar1.Value = 0;;
this.LB_ExportCount.Text = string.Format("已导出{0}条", count + 1);
MessageBox.Show("导出完成！", "信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
#endregion
}
#region 已知固定路径直接在DBF文件中插入数据
//FileInfo fi = new FileInfo(@"D:\DBF\N042_YH.dbf");
//string mulu = fi.DirectoryName;
//dt.TableName = fi.Name;
//DbfExportHelper helper = new DbfExportHelper(@"D:\DBF");
//if (helper.GetDBFData(fi.Name))
//{
// helper.DeleteDbfData(dt.TableName);
// helper.fillData(dt);
//}
//else
//{
// helper.CreateNewTable(dt);
// helper.fillData(dt);
//}
#endregion
}
else
{
MessageBox.Show("请点击查询按钮或更改条件再次查询！","提示",MessageBoxButtons.OK,MessageBoxIcon.Warning);
}
}
public string DateTimeToString(int year,string month,string day)
{
StringBuilder datestr = new StringBuilder();
datestr.Append(year);
if (month.Length == 1)
{
month = "0" + month;
}
datestr.Append(month);
if (day.Length == 1)
{
day = "0" + day;
}
datestr.Append(day);
return datestr.ToString();
}
}
public class DbfExportHelper
{
List dbfcolumnName = new List();
///
/// 数据库所在路径
///
private string filePath = "";
///
/// 连接字符串
///
private string connstring = "";
///
/// 数据库连接
///
private OleDbConnection Connection = new OleDbConnection();
///
/// 错误信息
///
private string _ErrInfo;
///
/// 构造函数
///
/// dbf文件所在文件夹路径
public DbfExportHelper(string filePath)
{
this.filePath = filePath;
this.connstring = string.Format("Provider = Microsoft.Jet.OLEDB.4.0 ;Data Source ={0};Extended Properties=dBASE IV;", filePath);
this.Connection = new OleDbConnection(connstring);
}
///
/// 改变数据库所在路径
///
/// 新文件夹路径
///
public bool ChangeDbfPosition(string filePath)
{
bool success = true;
if (!Directory.Exists(filePath))
{
success = false;
}
else
{
this.filePath = filePath;
this.connstring = string.Format("Provider = Microsoft.Jet.OLEDB.4.0 ;Data Source ={0};Extended Properties=dBASE IV;", filePath);
this.Connection = new OleDbConnection(connstring);
this._ErrInfo = string.Empty;
}
return success;
}
///
/// 构造dbf文件，文件名称为dt的表名，后缀名为dbf
///
/// 待写入的表格数据
///
public bool CreateNewTable(DataTable dt)
{
bool success = false;
OleDbCommand command = Connection.CreateCommand();
try
{
int i = 0;
if (File.Exists(filePath + @"\" + dt.TableName + ".dbf"))
{
File.Delete(filePath + @"\" + dt.TableName + ".dbf");
}
Connection.Open();
command.CommandType = CommandType.Text;
//List cols = new List();
StringBuilder cols = new StringBuilder();//和List要实现的功能相同
foreach (DataColumn dc in dt.Columns)
{
string colType = "";
string colName = dc.ColumnName;
switch (dc.DataType.Name)
{
case "Boolean":
colType = "bool";
break;
case "Double":
case "Float":
colType = "double";
break;
case "Int16":
case "Int32":
case "Int64":
case "Int":
colType = "int";
break;
case "String":
colType = "varchar";
break;
default:
colType = "varchar";
break;
}
//cols.Add(string.Format(@"{0} {1}", colName, colType));
if (i < dt.Columns.Count - 1)
{
cols.Append(string.Format("{0} {1}" + ",", colName, colType));
i++;
}
else
{
cols.Append(string.Format("{0} {1}", colName, colType));
}
}
string cols_where = cols.ToString();
//string cols_where = string.Join(",", cols);
string sql = string.Format(@"CREATE TABLE {0} ({1})", dt.TableName, cols_where);
command.CommandText = sql;
command.ExecuteNonQuery();
success = true;
}
catch (Exception c)
{
_ErrInfo = c.Message;
MessageBox.Show("创建失败，错误提示信息为：" + _ErrInfo, "警告", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
finally
{
command.Dispose();
if (Connection.State == System.Data.ConnectionState.Open)
Connection.Close();
command.Dispose();
}
return success;
}
///
/// 查看已知DBF中是否存在数据,并获取列名与表对比
///
///
public int GetDBFColumnData(string dtname)
{
int i = 0;
string sql = string.Format("select * from {0}",dtname);
try
{
OleDbCommand dc = new OleDbCommand(sql, this.Connection);
DataSet ds = new DataSet();
OleDbDataAdapter da = new OleDbDataAdapter();
da.SelectCommand = dc;
da.Fill(ds);
DataTable ColumnList = new DataTable();
ColumnList.Columns.Add();
foreach (DataColumn dcolum in ds.Tables[0].Columns)
{
ColumnList.Rows.Add(dcolum.ColumnName);
};
foreach (DataRow dr in ColumnList.Rows)
{
dbfcolumnName.Add(dr["COLUMN1"].ToString());
}
if (dbfcolumnName != null && dbfcolumnName.Count > 0)
{
i = 0;
}
else
{
i = 1;
}
}
catch (Exception ex)
{
MessageBox.Show("错误提示：DBF文件名过长,请改至8个字符以内！","警告",MessageBoxButtons.OK,MessageBoxIcon.Error);
i = 2;
}
return i;
}
///
///删除DBF表文件的数据
///
public bool DeleteDbfData(string tablename)
{
bool deletedbf = true;
OleDbCommand dc = Connection.CreateCommand();
try
{
Connection.Open();
string sqldelete = @"delete from " + tablename;
dc.CommandText = sqldelete;
dc.ExecuteNonQuery();
}
catch (Exception ex)
{
MessageBox.Show(tablename+"中的数据无法被删除，请确认该文件是否在其他地方被打开！","提示",MessageBoxButtons.OK,MessageBoxIcon.Warning);
deletedbf = false;
}
finally
{
if (Connection != null)
Connection.Close();
dc.Dispose();
}
return deletedbf;
}
///
/// 导入数据到dbf文件
///
///
/// 导入的数据条数
public bool batchfillData(DataTable dt,int i)
{
bool batchexportsuccess = true;
OleDbCommand dc = Connection.CreateCommand();
Connection.Open();
try
{
if(dbfcolumnName!=null&&dbfcolumnName.Count > 0)
{
string sqlInsert = "insert into " + dt.TableName + "({0}) values ({1})";
string invalues = "";
string cols = "";
foreach (DataColumn col in dt.Columns)
{
bool bl = false;
foreach (string dbf in dbfcolumnName)
{
if (col.ColumnName.Equals(dbf))
{
bl = true;
break;
}
}
if (bl)
{
if (dt.Rows[i][col].ToString() != string.Empty && dt.Rows[i][col].ToString() != null && dt.Rows[i][col].ToString() != "null")
{
cols += col.ColumnName + ",";
if (col.DataType == typeof(string))
{
invalues += "'" + dt.Rows[i][col].ToString() + "',";
}
else if (col.DataType == typeof(DateTime))
{
invalues += "'" + dt.Rows[i][col].ToString() + "',";
}
else
{
invalues += dt.Rows[i][col].ToString() + ",";
}
}
}
}
invalues = invalues.Remove(invalues.Length - 1, 1);
cols = cols.Remove(cols.Length - 1, 1);
sqlInsert = string.Format(sqlInsert, cols, invalues);
dc.CommandText = sqlInsert;
dc.ExecuteNonQuery();
}
else
{
string sqlInsert = "insert into " + dt.TableName + "({0}) values({1})";
string invalues = "";
string cols = "";
foreach (DataColumn col in dt.Columns)
{
if (dt.Rows[i][col].ToString() != string.Empty && dt.Rows[i][col].ToString() != null && dt.Rows[i][col].ToString() != "null")
{
cols += col.ColumnName + ",";
if (col.DataType == typeof(string))
{
invalues += "'" + dt.Rows[i][col].ToString() + "',";
}
else if (col.DataType == typeof(DateTime))
{
invalues += "'" + dt.Rows[i][col].ToString() + "',";
}
else
{
invalues += dt.Rows[i][col].ToString() + ",";
}
}
}
invalues = invalues.Remove(invalues.Length - 1, 1);
cols = cols.Remove(cols.Length - 1, 1);
sqlInsert = string.Format(sqlInsert, cols, invalues);
dc.CommandText = sqlInsert;
dc.ExecuteNonQuery();
}
}
catch (Exception ex)
{
DialogResult dr = MessageBox.Show("第"+i+1+"条数据插入失败，失败提示信息为："+ex.Message+"是否继续？","警告",MessageBoxButtons.YesNo,MessageBoxIcon.Warning);
if (dr == DialogResult.No)
{
batchexportsuccess = false;
}
}
finally
{
if (Connection != null)
Connection.Close();
dc.Dispose();
}
return batchexportsuccess;
}
/* 无滚动条或显示导出条数的导出
public bool fillData(DataTable dt)
{
bool exportsuccess = true;
int count = 0;
OleDbCommand dc = Connection.CreateCommand();
_ErrInfo = "";
try
{
Connection.Open();
//导入数据
if (dbfcolumnName!=null&&dbfcolumnName.Count > 0)
{
foreach (DataRow row in dt.Rows)
{
string sqlInsert = "insert into " + dt.TableName + "({0}) values ({1})";
string invalues = "";
string cols = "";
foreach (DataColumn col in dt.Columns)
{
bool bl = false;
foreach (string dbf in dbfcolumnName)
{
if (col.ColumnName.Equals(dbf))
{
bl = true;
break;
}
}
if (bl)
{
if (row[col].ToString() != string.Empty && row[col].ToString() != null && row[col].ToString() != "null")
{
cols += col.ColumnName + ",";
if (col.DataType == typeof(string))
{
invalues += "'" + row[col].ToString() + "',";
}
else if (col.DataType == typeof(DateTime))
{
invalues += "'" + row[col].ToString() + "',";
}
else
{
invalues += row[col].ToString() + ",";
}
}
}
}
invalues = invalues.Remove(invalues.Length - 1, 1);
cols = cols.Remove(cols.Length - 1, 1);
sqlInsert = string.Format(sqlInsert, cols, invalues);
dc.CommandText = sqlInsert;
count += dc.ExecuteNonQuery();
InsertCount(count);
}
}
else
{
foreach (DataRow row in dt.Rows)
{
string sqlInsert = "insert into " + dt.TableName + "({0}) values({1})";
string invalues = "";
string cols = "";
foreach (DataColumn col in dt.Columns)
{
if (row[col].ToString() != string.Empty && row[col].ToString() != null && row[col].ToString() != "null")
{
cols += col.ColumnName + ",";
if (col.DataType == typeof(string))
{
invalues += "'" + row[col].ToString() + "',";
}
else if (col.DataType == typeof(DateTime))
{
invalues += "'" + row[col].ToString() + "',";
}
else
{
invalues += row[col].ToString() + ",";
}
}
}
invalues = invalues.Remove(invalues.Length - 1, 1);
cols = cols.Remove(cols.Length - 1, 1);
sqlInsert = string.Format(sqlInsert, cols, invalues);
dc.CommandText = sqlInsert;
count += dc.ExecuteNonQuery();
InsertCount(count);
}
}
}
catch (Exception err)
{
_ErrInfo = err.Message;
MessageBox.Show("导出失败,错误信息为："+_ErrInfo, "警告", MessageBoxButtons.OK, MessageBoxIcon.Error);
exportsuccess = false;
}
finally
{
if (Connection != null)
Connection.Close();
dc.Dispose();
MessageBox.Show("导出成功!", "信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
return exportsuccess;
}
*/
///
/// 摧毁对象
///
public void Dispose()
{
if (Connection != null)
Connection.Dispose();
}
}
4.运行结果：
5.最后声明：保存好的DBF文件可以用EXCEL打开
6.其他相关文章链接http://blog.csdn.net/dujiajiyiyi/article/details/53841398?
https://my.oschina.net/Tsybius2014/blog/282797