C# ommand.ExecuteReader（）） 使用（var outFile=File.CreateText（destinationFile）） { string[]columnNames=GetColumnNames（reader.ToArray（）； int numFields=columnNames.Length； outFile.WriteLine（string.Join（“，”，columnNames））； if（reader.HasRows） { while（reader.Read（）） { 字符串[]列值= 可枚举范围（0，numFields） .Select（i=>reader.GetValue（i.ToString（）） .Select（field=>string.Concat（“\”，field.Replace（“\”，“\”，“\”），“\”） .ToArray（）； outFile.WriteLine（string.Join（“，”，columnValues））； } } } } 私有IEnumerable GetColumnNames（IDataReader阅读器） { foreach（reader.GetSchemaTable（）.Rows中的DataRow行） { 收益率返回（字符串）行[“ColumnName”]； } } }
我写了这段代码，并声明了它。我合并了上面的代码。我使用这段代码。我使用VS2010C# ommand.ExecuteReader（）） 使用（var outFile=File.CreateText（destinationFile）） { string[]columnNames=GetColumnNames（reader.ToArray（）； int numFields=columnNames.Length； outFile.WriteLine（string.Join（“，”，columnNames））； if（reader.HasRows） { while（reader.Read（）） { 字符串[]列值= 可枚举范围（0，numFields） .Select（i=>reader.GetValue（i.ToString（）） .Select（field=>string.Concat（“\”，field.Replace（“\”，“\”，“\”），“\”） .ToArray（）； outFile.WriteLine（string.Join（“，”，columnValues））； } } } } 私有IEnumerable GetColumnNames（IDataReader阅读器） { foreach（reader.GetSchemaTable（）.Rows中的DataRow行） { 收益率返回（字符串）行[“ColumnName”]； } } },c#,filehelpers,C#,Filehelpers,我写了这段代码，并声明了它。我合并了上面的代码。我使用这段代码。我使用VS2010 //this is all lib that i used||||||||||||||| using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text;
//this is all lib that i used|||||||||||||||
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using UsbLibrary;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Globalization;
//cocy in a button||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
SqlConnection _connection = new SqlConnection();
SqlDataAdapter _dataAdapter = new SqlDataAdapter();
SqlCommand _command = new SqlCommand();
DataTable _dataTable = new DataTable();
_connection = new SqlConnection();
_dataAdapter = new SqlDataAdapter();
_command = new SqlCommand();
_dataTable = new DataTable();
//dbk is my database name that you can change it to your database name
_connection.ConnectionString = "Data Source=.;Initial Catalog=dbk;Integrated Security=True";
_connection.Open();
SaveFileDialog saveFileDialogCSV = new SaveFileDialog();
saveFileDialogCSV.InitialDirectory = Application.ExecutablePath.ToString();
saveFileDialogCSV.Filter = "CSV files (*.csv)|*.csv|All files (*.*)|*.*";
saveFileDialogCSV.FilterIndex = 1;
saveFileDialogCSV.RestoreDirectory = true;
string path_csv="";
if (saveFileDialogCSV.ShowDialog() == DialogResult.OK)
{
// Runs the export operation if the given filenam is valid.
path_csv= saveFileDialogCSV.FileName.ToString();
}
DumpTableToFile(_connection, "tbl_trmc", path_csv);
}
//end of code in button|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
public void DumpTableToFile(SqlConnection connection, string tableName, string destinationFile)
{
using (var command = new SqlCommand("select * from " + tableName, connection))
using (var reader = command.ExecuteReader())
using (var outFile = System.IO.File.CreateText(destinationFile))
{
string[] columnNames = GetColumnNames(reader).ToArray();
int numFields = columnNames.Length;
outFile.WriteLine(string.Join(",", columnNames));
if (reader.HasRows)
{
while (reader.Read())
{
string[] columnValues =
Enumerable.Range(0, numFields)
.Select(i => reader.GetValue(i).ToString())
.Select(field => string.Concat("\"", field.Replace("\"", "\"\""), "\""))
.ToArray();
outFile.WriteLine(string.Join(",", columnValues));
}
}
}
}
private IEnumerable<string> GetColumnNames(IDataReader reader)
{
foreach (DataRow row in reader.GetSchemaTable().Rows)
{
yield return (string)row["ColumnName"];
}
}
//这就是我使用的所有库|||||||||||||||
使用制度；
使用System.Collections.Generic；
使用系统组件模型；
使用系统数据；
使用系统图；
使用System.Linq；
使用系统文本；
使用System.Windows.Forms；
使用UsbLibrary；
使用系统数据；
使用System.Data.SqlClient；
使用系统配置；
利用制度全球化；
//戴纽扣的科西||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
SqlConnection _connection=newsqlconnection（）；
SqlDataAdapter _dataAdapter=新的SqlDataAdapter（）；
SqlCommand _command=newsqlcommand（）；
DataTable _DataTable=新DataTable（）；
_connection=newsqlconnection（）；
_dataAdapter=新的SqlDataAdapter（）；
_command=newsqlcommand（）；
_dataTable=新的dataTable（）；
//dbk是我的数据库名，您可以将其更改为您的数据库名
_connection.ConnectionString=“数据源=。；初始目录=dbk；综合安全=真”；
_connection.Open（）；
SaveFileDialog saveFileDialogCSV=新建SaveFileDialog（）；
saveFileDialogCSV.InitialDirectory=Application.ExecutablePath.ToString（）；
saveFileDialogCSV.Filter=“CSV文件（*.CSV）|*.CSV |所有文件（*.*）|*”；
saveFileDialogCSV.FilterIndex=1；
saveFileDialogCSV.RestoreDirectory=true；
字符串路径_csv=“”；
如果（saveFileDialogCSV.ShowDialog（）==DialogResult.OK）
{
//如果给定的filenam有效，则运行导出操作。
path_csv=saveFileDialogCSV.FileName.ToString（）；
}
DumpTableToFile（_连接，“tbl_trmc”，路径_csv）；
}
//代码结束按钮|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
public void DumpTableToFile（SqlConnection连接、string tableName、string destinationFile）
{
使用（var命令=新的SqlCommand（“从“+tableName，connection”中选择*）
使用（var reader=command.ExecuteReader（））
使用（var outFile=System.IO.File.CreateText（destinationFile））
{
string[]columnNames=GetColumnNames（reader.ToArray（）；
int numFields=columnNames.Length；
outFile.WriteLine（string.Join（“，”，columnNames））；
if（reader.HasRows）
{
while（reader.Read（））
{
字符串[]列值=
可枚举范围（0，numFields）
.Select（i=>reader.GetValue（i.ToString（））
.Select（field=>string.Concat（“\”，field.Replace（“\”，“\”，“\”），“\”）
.ToArray（）；
outFile.WriteLine（string.Join（“，”，columnValues））；
}
}
}
}
私有IEnumerable GetColumnNames（IDataReader阅读器）
{
foreach（reader.GetSchemaTable（）.Rows中的DataRow行）
{
收益率返回（字符串）行[“ColumnName”]；
}
}
“System.Byte”MM/dd/yyyy hh:MM:ss ttpublic static void DumpTableToFile(SqlConnection connection, Dictionary<string, string> cArgs)
{
string query = "SELECT ";
string z = "";
if (cArgs.TryGetValue("top_count", out z))
{
query += string.Format("TOP {0} ", z);
}
query += string.Format("* FROM {0} (NOLOCK) ", cArgs["table"]);
string lower_bound = "", upper_bound = "", column_name = "";
if (cArgs.TryGetValue("lower_bound", out lower_bound) && cArgs.TryGetValue("column_name", out column_name))
{
query += string.Format("WHERE {0} >= {1} ", column_name, lower_bound);
if (cArgs.TryGetValue("upper_bound", out upper_bound))
{
query += string.Format("AND {0} < {1} ", column_name, upper_bound);
}
}
Console.WriteLine(query);
Console.WriteLine("");
using (var command = new SqlCommand(query, connection))
using (var reader = command.ExecuteReader())
using (var outFile = File.CreateText(cArgs["out_file"]))
{
string[] columnNames = GetColumnNames(reader).ToArray();
int numFields = columnNames.Length;
Console.WriteLine(string.Join(",", columnNames));
Console.WriteLine("");
if (reader.HasRows)
{
Type datetime_type = Type.GetType("System.DateTime");
Type byte_arr_type = Type.GetType("System.Byte[]");
string format = "yyyy-MM-dd HH:mm:ss.fff";
int ii = 0;
while (reader.Read())
{
ii += 1;
string[] columnValues =
Enumerable.Range(0, numFields)
.Select(i => reader.GetValue(i).GetType()==datetime_type?((DateTime) reader.GetValue(i)).ToString(format):(reader.GetValue(i).GetType() == byte_arr_type? String.Concat(Array.ConvertAll((byte[]) reader.GetValue(i), x => x.ToString("X2"))) :reader.GetValue(i).ToString()))
///.Select(field => string.Concat("\"", field.Replace("\"", "\"\""), "\""))
.Select(field => field.Replace("\t", " "))
.ToArray();
outFile.WriteLine(string.Join("\t", columnValues));
if (ii % 100000 == 0)
{
Console.WriteLine("row {0}", ii);
}
}
}
}
}
public static IEnumerable<string> GetColumnNames(IDataReader reader)
{
foreach (DataRow row in reader.GetSchemaTable().Rows)
{
yield return (string)row["ColumnName"];
}
}
publicstaticvoiddumptabletofile（SqlConnection连接、字典cArgs）
{
string query=“SELECT”；
字符串z=“”；
if（cArgs.TryGetValue（“顶部计数”，超出z））
{
query+=string.Format（“TOP{0}”，z）；
}
query+=string.Format（“*FROM{0}（NOLOCK）”，cArgs[“table]”）；
字符串下限=”，上限=”，列名称=”；
if（cArgs.TryGetValue（“下限”，out下限）和&cArgs.TryGetValue（“列名”，out列名））
{
query+=string.Format（“其中{0}>={1}”，列名称，下界）；
if（cArgs.TryGetValue（“上限”，超出上限））
{
query+=string.Format（“AND{0}<{1}”，列名称，上界）；
}
}
Console.WriteLine（查询）；
控制台。写线（“”）；
使用（var命令=新的SqlCommand（查询、连接））
使用（var reader=command.ExecuteReader（））
使用（var outFile=File.CreateText（cArgs[“out_File”]））
{
string[]columnNames=GetColumnNames（reader.ToArray（）；
int numFields=columnNames.Length；
Console.WriteLine（string.Join（“，”，columnNames））；
控制台。写线（“”）；
private void exportToCSV()
{
//Asks the filenam with a SaveFileDialog control.
SaveFileDialog saveFileDialogCSV = new SaveFileDialog();
saveFileDialogCSV.InitialDirectory = Application.ExecutablePath.ToString();
saveFileDialogCSV.Filter = "CSV files (*.csv)|*.csv|All files (*.*)|*.*";
saveFileDialogCSV.FilterIndex = 1;
saveFileDialogCSV.RestoreDirectory = true;
if (saveFileDialogCSV.ShowDialog() == DialogResult.OK)
{
// Runs the export operation if the given filenam is valid.
exportToCSVfile(saveFileDialogCSV.FileName.ToString());
}
}
* Exports data to the CSV file.
*/
private void exportToCSVfile(string fileOut)
{
// Connects to the database, and makes the select command.
string sqlQuery = "select * from dbo." + this.lbxTables.SelectedItem.ToString();
SqlCommand command = new SqlCommand(sqlQuery, objConnDB_Auto);
// Creates a SqlDataReader instance to read data from the table.
SqlDataReader dr = command.ExecuteReader();
// Retrives the schema of the table.
DataTable dtSchema = dr.GetSchemaTable();
// Creates the CSV file as a stream, using the given encoding.
StreamWriter sw = new StreamWriter(fileOut, false, this.encodingCSV);
string strRow; // represents a full row
// Writes the column headers if the user previously asked that.
if (this.chkFirstRowColumnNames.Checked)
{
sw.WriteLine(columnNames(dtSchema, this.separator));
}
// Reads the rows one by one from the SqlDataReader
// transfers them to a string with the given separator character and
// writes it to the file.
while (dr.Read())
{
strRow = "";
for (int i = 0; i < dr.FieldCount; i++)
{
switch (Convert.ToString(dr.GetFieldType(i)))
{
case "System.Int16":
strRow += Convert.ToString(dr.GetInt16(i));
break;
case "System.Int32" :
strRow += Convert.ToString(dr.GetInt32(i));
break;
case "System.Int64":
strRow += Convert.ToString(dr.GetInt64(i));
break;
case "System.Decimal":
strRow += Convert.ToString(dr.GetDecimal(i));
break;
case "System.Double":
strRow += Convert.ToString(dr.GetDouble(i));
break;
case "System.Float":
strRow += Convert.ToString(dr.GetFloat(i));
break;
case "System.Guid":
strRow += Convert.ToString(dr.GetGuid(i));
break;
case "System.String":
strRow += dr.GetString(i);
break;
case "System.Boolean":
strRow += Convert.ToString(dr.GetBoolean(i));
break;
case "System.DateTime":
strRow += Convert.ToString(dr.GetDateTime(i));
break;
}
if (i < dr.FieldCount - 1)
{
strRow += this.separator;
}
}
sw.WriteLine(strRow);
}
// Closes the text stream and the database connenction.
sw.Close();
dr.Close();
// Notifies the user.
MessageBox.Show("ready");
}
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.IO;
using System.Linq;
public class TableDumper
{
public void DumpTableToFile(SqlConnection connection, string tableName, string destinationFile)
{
using (var command = new SqlCommand("select * from " + tableName, connection))
using (var reader = command.ExecuteReader())
using (var outFile = File.CreateText(destinationFile))
{
string[] columnNames = GetColumnNames(reader).ToArray();
int numFields = columnNames.Length;
outFile.WriteLine(string.Join(",", columnNames));
if (reader.HasRows)
{
while (reader.Read())
{
string[] columnValues =
Enumerable.Range(0, numFields)
.Select(i => reader.GetValue(i).ToString())
.Select(field => string.Concat("\"", field.Replace("\"", "\"\""), "\""))
.ToArray();
outFile.WriteLine(string.Join(",", columnValues));
}
}
}
}
private IEnumerable<string> GetColumnNames(IDataReader reader)
{
foreach (DataRow row in reader.GetSchemaTable().Rows)
{
yield return (string)row["ColumnName"];
}
}
}
//this is all lib that i used|||||||||||||||
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using UsbLibrary;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Globalization;
//cocy in a button||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
SqlConnection _connection = new SqlConnection();
SqlDataAdapter _dataAdapter = new SqlDataAdapter();
SqlCommand _command = new SqlCommand();
DataTable _dataTable = new DataTable();
_connection = new SqlConnection();
_dataAdapter = new SqlDataAdapter();
_command = new SqlCommand();
_dataTable = new DataTable();
//dbk is my database name that you can change it to your database name
_connection.ConnectionString = "Data Source=.;Initial Catalog=dbk;Integrated Security=True";
_connection.Open();
SaveFileDialog saveFileDialogCSV = new SaveFileDialog();
saveFileDialogCSV.InitialDirectory = Application.ExecutablePath.ToString();
saveFileDialogCSV.Filter = "CSV files (*.csv)|*.csv|All files (*.*)|*.*";
saveFileDialogCSV.FilterIndex = 1;
saveFileDialogCSV.RestoreDirectory = true;
string path_csv="";
if (saveFileDialogCSV.ShowDialog() == DialogResult.OK)
{
// Runs the export operation if the given filenam is valid.
path_csv= saveFileDialogCSV.FileName.ToString();
}
DumpTableToFile(_connection, "tbl_trmc", path_csv);
}
//end of code in button|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
public void DumpTableToFile(SqlConnection connection, string tableName, string destinationFile)
{
using (var command = new SqlCommand("select * from " + tableName, connection))
using (var reader = command.ExecuteReader())
using (var outFile = System.IO.File.CreateText(destinationFile))
{
string[] columnNames = GetColumnNames(reader).ToArray();
int numFields = columnNames.Length;
outFile.WriteLine(string.Join(",", columnNames));
if (reader.HasRows)
{
while (reader.Read())
{
string[] columnValues =
Enumerable.Range(0, numFields)
.Select(i => reader.GetValue(i).ToString())
.Select(field => string.Concat("\"", field.Replace("\"", "\"\""), "\""))
.ToArray();
outFile.WriteLine(string.Join(",", columnValues));
}
}
}
}
private IEnumerable<string> GetColumnNames(IDataReader reader)
{
foreach (DataRow row in reader.GetSchemaTable().Rows)
{
yield return (string)row["ColumnName"];
}
}
public static void DumpTableToFile(SqlConnection connection, Dictionary<string, string> cArgs)
{
string query = "SELECT ";
string z = "";
if (cArgs.TryGetValue("top_count", out z))
{
query += string.Format("TOP {0} ", z);
}
query += string.Format("* FROM {0} (NOLOCK) ", cArgs["table"]);
string lower_bound = "", upper_bound = "", column_name = "";
if (cArgs.TryGetValue("lower_bound", out lower_bound) && cArgs.TryGetValue("column_name", out column_name))
{
query += string.Format("WHERE {0} >= {1} ", column_name, lower_bound);
if (cArgs.TryGetValue("upper_bound", out upper_bound))
{
query += string.Format("AND {0} < {1} ", column_name, upper_bound);
}
}
Console.WriteLine(query);
Console.WriteLine("");
using (var command = new SqlCommand(query, connection))
using (var reader = command.ExecuteReader())
using (var outFile = File.CreateText(cArgs["out_file"]))
{
string[] columnNames = GetColumnNames(reader).ToArray();
int numFields = columnNames.Length;
Console.WriteLine(string.Join(",", columnNames));
Console.WriteLine("");
if (reader.HasRows)
{
Type datetime_type = Type.GetType("System.DateTime");
Type byte_arr_type = Type.GetType("System.Byte[]");
string format = "yyyy-MM-dd HH:mm:ss.fff";
int ii = 0;
while (reader.Read())
{
ii += 1;
string[] columnValues =
Enumerable.Range(0, numFields)
.Select(i => reader.GetValue(i).GetType()==datetime_type?((DateTime) reader.GetValue(i)).ToString(format):(reader.GetValue(i).GetType() == byte_arr_type? String.Concat(Array.ConvertAll((byte[]) reader.GetValue(i), x => x.ToString("X2"))) :reader.GetValue(i).ToString()))
///.Select(field => string.Concat("\"", field.Replace("\"", "\"\""), "\""))
.Select(field => field.Replace("\t", " "))
.ToArray();
outFile.WriteLine(string.Join("\t", columnValues));
if (ii % 100000 == 0)
{
Console.WriteLine("row {0}", ii);
}
}
}
}
}
public static IEnumerable<string> GetColumnNames(IDataReader reader)
{
foreach (DataRow row in reader.GetSchemaTable().Rows)
{
yield return (string)row["ColumnName"];
}
}