c#大文件读取和写入数据库
最近一个项目需要将大文件写入和读取到数据库，觉得可能很多人也需要相关得东西，所以就将代码帖出来
protected int state = 0; //表示进度条当前处理的事件类型，1表读取word,2表写入word，3表doc转pdf，4表txt转pdf
private System.Windows.Forms.Form getDialog(string strFormName,System.Drawing.Icon ico,string strShowContent)
{
System.Windows.Forms.Form frm = new Form();
//初始化窗体
frm.Text = strFormName;
frm.Icon = ico;
frm.MaximizeBox = false;
frm.MinimizeBox = false;
frm.TopMost = true;
frm.ShowInTaskbar = false;
frm.Height = 168;
frm.Width = 544;
frm.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
//添加控件
System.Windows.Forms.Label lblContent = new Label();
lblContent.Text = strShowContent;
lblContent.Left = 30;
lblContent.Top = 20;
lblContent.Text = strShowContent;
frm.Controls.Add(lblContent);
System.Windows.Forms.ProgressBar prgLoader = new ProgressBar();
prgLoader.Left=30;
prgLoader.Top = lblContent.Top + lblContent.Height + 5;
prgLoader.Width = frm.Width - 2 * 30;
frm.Controls.Add(prgLoader);
System.Windows.Forms.Label lblShowPercent = new Label();
lblShowPercent.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
lblShowPercent.Left = prgLoader.Width + 30 - lblShowPercent.Width;
lblShowPercent.Top = prgLoader.Height + prgLoader.Top + 5;
lblShowPercent.Text = prgLoader.Value.ToString() + "%";
lblShowPercent.Name = "lblShowPercent";
frm.Controls.Add(lblShowPercent);
System.Windows.Forms.Button btnOK = new Button();
btnOK.Text = "取消";
btnOK.Left = prgLoader.Width + 30 - btnOK.Width;
btnOK.Top = frm.Height - 30 - btnOK.Height;
btnOK.Click +=new EventHandler(btnOk_Click);
frm.Controls.Add(btnOK);
return frm;
}
private void btnOk_Click(object sender,System.EventArgs e)
{
//获取控件信息
System.Windows.Forms.Button btnOk = (System.Windows.Forms.Button)sender;
System.Windows.Forms.Form frm = (System.Windows.Forms.Form)btnOk.Parent;
System.Windows.Forms.ProgressBar prgLoader = null;
foreach(System.Windows.Forms.Control control in frm.Controls)
{
if(control.GetType().ToString() == "System.Windows.Forms.ProgressBar")
{
prgLoader = (System.Windows.Forms.ProgressBar)control;
}
}
//判断当前的完成情况
if(prgLoader.Value == 100)
{
frm.Close();
}
else
{
System.Windows.Forms.DialogResult dr = MessageBox.Show(frm,"是否停止当前操作?","提示",System.Windows.Forms.MessageBoxButtons.YesNo,
System.Windows.Forms.MessageBoxIcon.Warning);
if(dr == System.Windows.Forms.DialogResult.Yes)
{
state = 0;
frm.Close();
}
}
}
/// <summary>
/// 写入word到数据库
/// </summary>
/// <param name="sqlcon">sql连接类</param>
/// <param name="strTargetInsert">直接将目标内容写入数据库的sql，"insert into 表名(目标列名) values (@block)"</param>
/// <param name="strTargetHandle">获取目标内容的句柄的sql，"select @content=textptr(目标列名) from 目标表名 where 条件"</param>
/// <param name="strTableName">目标表名</param>
/// <param name="strColumnName">目标列名</param>
/// <param name="strPath">要读取word的路径</param>
/// <param name="intSetBlock">定义块大小</param>
/// <param name="bolShowDialog">是否显示进度条</param>
/// <param name="strFormName">窗体名称</param>
/// <param name="ico">窗体图标</param>
/// <param name="strShowContent">显示内容</param>
/// <returns>true表成功</returns>
public bool WriteWordDocument(System.Data.SqlClient.SqlConnection sqlcon,string strTargetInsert,string strTargetHandle,string strTableName,string strColumnName,string strPath,int intSetBlock,bool bolShowDialog,string strFormName,System.Drawing.Icon ico,string strShowContent)
{
//初始化SqlCommand
System.Data.SqlClient.SqlCommand sqlcmd = new System.Data.SqlClient.SqlCommand();
sqlcmd.Connection = sqlcon;
sqlcmd.CommandType = System.Data.CommandType.Text;
int intBlock = intSetBlock; //块大小
int intCount = 0; //分快数
int intLength = 0; //获取文件内容的长度
string strSelect = ""; //要执行的sql查询语句
byte []bytContent = null; //定义内容数组
//比例
int intPercent = 0;
//建立要输入的文件流
System.IO.FileStream fs = null;
//建立二进制读取
System.IO.BinaryReader br = null;
try
{
fs = new FileStream(strPath,System.IO.FileMode.Open);
}
catch
{
return false;
}
br = new BinaryReader((Stream)fs);
//为关键参数赋值
try
{
//是否显示进度
if(bolShowDialog)
{
//获取精度窗体，引用窗体中的进度条和按钮控件
System.Windows.Forms.Form frmProgress = getDialog(strFormName,ico,strShowContent);
System.Windows.Forms.ProgressBar prgLoader = null;
System.Windows.Forms.Button btnOk = null;
System.Windows.Forms.Label lblShowPercent = null;
foreach(System.Windows.Forms.Control control in frmProgress.Controls)
{
if(control.GetType().ToString() == "System.Windows.Forms.ProgressBar")
{
prgLoader = (System.Windows.Forms.ProgressBar)control;
}
if(control.GetType().ToString() == "System.Windows.Forms.Button")
{
btnOk = (System.Windows.Forms.Button)control;
}
if(control.GetType().ToString() == "System.Windows.Forms.Label" && control.Name == "lblShowPercent")
{
lblShowPercent = (System.Windows.Forms.Label)control;
}
}
frmProgress.Show();
//启动转换
state = 2;
if(fs.Length > 2147483647 || fs.Length == 0) //因为image列最多只能存储2,147,483,647个字节，所以这里做限定
{
return false;
}
intLength = (int)fs.Length;
intCount = intLength / intBlock;
if(intCount == 0)
{
strSelect = strTargetInsert;
bytContent = new byte[intLength];
bytContent = br.ReadBytes(intLength);
sqlcmd.CommandText = strSelect;
sqlcmd.Parameters.Add("@block",System.Data.SqlDbType.Image).Value = bytContent;
sqlcmd.ExecuteNonQuery();
}
else
{
strSelect = strTargetInsert;
bytContent = new byte[intBlock];
bytContent = br.ReadBytes(intBlock);
sqlcmd.CommandText = strSelect;
sqlcmd.Parameters.Add("@block",System.Data.SqlDbType.Image).Value = bytContent;
sqlcmd.Parameters.Add("@length",System.Data.SqlDbType.Int).Value = 0;
sqlcmd.ExecuteNonQuery();
int i = 1;
while(i != intCount)
{
if(state == 0)
{
strSelect = "delete from " + strTableName + strTargetHandle.Substring(strTargetHandle.LastIndexOf(" where "));
sqlcmd.CommandText = strSelect;
sqlcmd.ExecuteNonQuery();
bytContent = null;
fs.Close();
return false;
}
strSelect = "declare @content varbinary(16) ";
strSelect += strTargetHandle;
strSelect += " updatetext " + strTableName + "." + strColumnName + " @content @length 0 @block";
bytContent = br.ReadBytes(intBlock);
sqlcmd.Parameters["@block"].Value = bytContent;
sqlcmd.Parameters["@length"].Value = i * intBlock;
sqlcmd.CommandText = strSelect;
sqlcmd.ExecuteNonQuery();
intPercent = (int)(((double)(i * intBlock)) / ((double)intLength) * 100);
prgLoader.Value = intPercent;
lblShowPercent.Text = prgLoader.Value.ToString() + "%";
++i;
Application.DoEvents();
}
int intResidual = intLength % intBlock;
if(intResidual > 0)
{
strSelect = "declare @content varbinary(16) ";
strSelect += strTargetHandle;
strSelect += " updatetext " + strTableName + "." + strColumnName + " @content @length 0 @block";
bytContent = new byte[intResidual];
bytContent = br.ReadBytes(intResidual);
sqlcmd.Parameters["@block"].Value = bytContent;
sqlcmd.Parameters["@length"].Value = intCount * intBlock;
sqlcmd.CommandText = strSelect;
sqlcmd.ExecuteNonQuery();
}
}
prgLoader.Value = 100;
lblShowPercent.Text = prgLoader.Value.ToString() + "%";
btnOk.Text = "关闭";
}
else
{
if(fs.Length > 2147483647 || fs.Length == 0) //因为image列最多只能存储2,147,483,647个字节，所以这里做限定
{
return false;
}
intLength = (int)fs.Length;
intCount = intLength / intBlock;
if(intCount == 0)
{
strSelect = strTargetInsert;
bytContent = new byte[intLength];
bytContent = br.ReadBytes(intLength);
sqlcmd.CommandText = strSelect;
sqlcmd.Parameters.Add("@block",System.Data.SqlDbType.Image).Value = bytContent;
sqlcmd.ExecuteNonQuery();
}
else
{
strSelect = strTargetInsert;
bytContent = new byte[intBlock];
bytContent = br.ReadBytes(intBlock);
sqlcmd.CommandText = strSelect;
sqlcmd.Parameters.Add("@block",System.Data.SqlDbType.Image).Value = bytContent;
sqlcmd.Parameters.Add("@length",System.Data.SqlDbType.Int).Value = 0;
sqlcmd.ExecuteNonQuery();
int i = 1;
while(i != intCount)
{
strSelect = "declare @content varbinary(16) ";
strSelect += strTargetHandle;
strSelect += " updatetext " + strTableName + "." + strColumnName + " @content @length 0 @block";
bytContent = br.ReadBytes(intBlock);
sqlcmd.Parameters["@block"].Value = bytContent;
sqlcmd.Parameters["@length"].Value = i * intBlock;
sqlcmd.CommandText = strSelect;
sqlcmd.ExecuteNonQuery();
++i;
}
int intResidual = intLength % intBlock;
if(intResidual > 0)
{
strSelect = "declare @content varbinary(16) ";
strSelect += strTargetHandle;
strSelect += " updatetext " + strTableName + "." + strColumnName + " @content @length 0 @block";
bytContent = new byte[intResidual];
bytContent = br.ReadBytes(intResidual);
sqlcmd.Parameters["@block"].Value = bytContent;
sqlcmd.Parameters["@length"].Value = intCount * intBlock;
sqlcmd.CommandText = strSelect;
sqlcmd.ExecuteNonQuery();
}
}
}
bytContent = null;
fs.Close();
}
catch
{
state = 0;
bytContent = null;
fs.Close();
return false;
}
state = 0;
return true;
}
/// <summary>
/// 从数据库读取word
/// </summary>
/// <param name="sqlcon">sql连接类</param>
/// <param name="strTargetSelect">直接获取目标内容的sql，"select 目标列名 from 目标表名 where 条件"</param>
/// <param name="strTargetLength">获取目标内容的长度的sql，"select datalength(目标列名) from 目标表名 where 条件"</param>
/// <param name="strTargetHandle">获取目标内容的句柄的sql，"select @content=textptr(目标列名) from 目标表名 where 条件"</param>
/// <param name="strTableName">目标表名</param>
/// <param name="strColumnName">目标列名</param>
/// <param name="strPath">要导出并保存的word的路径</param>
/// <param name="intSetBlock">定义块大小</param>
/// <param name="bolShowDialog">是否显示进度条</param>
/// <param name="strFormName">窗体名称</param>
/// <param name="ico">窗体图标</param>
/// <param name="strShowContent">显示内容</param>
/// <returns>true表成功</returns>
public bool ReadWordDocument(System.Data.SqlClient.SqlConnection sqlcon,string strTargetSelect,string strTargetLength,string strTargetHandle,string strTableName,string strColumnName,string strPath,int intSetBlock,bool bolShowDialog,string strFormName,System.Drawing.Icon ico,string strShowContent)
{
//初始化SqlCommand
System.Data.SqlClient.SqlCommand sqlcmd = new System.Data.SqlClient.SqlCommand();
sqlcmd.Connection = sqlcon;
sqlcmd.CommandType = System.Data.CommandType.Text;
int intBlock = intSetBlock; //块大小
int intCount = 0; //分快数
int intLength = 0; //获取的image列中的内容的长度
string strSelect = ""; //要执行的sql查询语句
byte []bytContent = null; //定义内容数组
int intPercent = 0; //获取读取的比例
//建立要输出的文件流
System.IO.FileStream fs = new FileStream(strPath,System.IO.FileMode.Create);
try
{
//获取指定image列中的内容长度
sqlcmd.CommandText = strTargetLength;
intLength = (int)sqlcmd.ExecuteScalar();
//如果长度为0
if(intLength == 0)
{
return false;
}
//获得分快数
intCount = intLength / intBlock;
//是否显示精度
if(bolShowDialog)
{
//获取精度窗体，引用窗体中的进度条和按钮控件
System.Windows.Forms.Form frmProgress = getDialog(strFormName,ico,strShowContent);
System.Windows.Forms.ProgressBar prgLoader = null;
System.Windows.Forms.Button btnOk = null;
System.Windows.Forms.Label lblShowPercent = null;
foreach(System.Windows.Forms.Control control in frmProgress.Controls)
{
if(control.GetType().ToString() == "System.Windows.Forms.ProgressBar")
{
prgLoader = (System.Windows.Forms.ProgressBar)control;
}
if(control.GetType().ToString() == "System.Windows.Forms.Button")
{
btnOk = (System.Windows.Forms.Button)control;
}
if(control.GetType().ToString() == "System.Windows.Forms.Label" && control.Name == "lblShowPercent")
{
lblShowPercent = (System.Windows.Forms.Label)control;
}
}
frmProgress.Show();
//启动转换
state = 1;
if(intCount == 0)
{
strSelect = strTargetSelect;
sqlcmd.CommandText = strSelect;
bytContent = new byte[intLength];
bytContent = sqlcmd.ExecuteScalar() as byte[];
fs.Write(bytContent,0,intLength);
prgLoader.Value = 100;
lblShowPercent.Text = prgLoader.Value + "%";
btnOk.Text = "关闭";
}
else
{
int i = 0;
bytContent = new byte[intBlock];
while(i < intCount)
{
if(state == 0)
{
bytContent = null;
System.IO.File.Delete(strPath);
fs.Close();
return false;
}
strSelect = "declare @content varbinary(16) "; //再sql中声明获取目标image列内容的句柄变量
strSelect += strTargetHandle; //获取句柄
//锁定并读取指定长度的数据
strSelect += " readtext " + strTableName + "." + strColumnName + " @content @start @count HOLDLOCK";
if(i == 0)
{
//添加@start和@count变量，分别表偏移变量和取的长度
sqlcmd.Parameters.Add("@start",System.Data.SqlDbType.Int).Value = 0;
sqlcmd.Parameters.Add("@count",System.Data.SqlDbType.Int).Value = intBlock;
}
else
{
sqlcmd.Parameters["@start"].Value = i * intBlock;
sqlcmd.Parameters["@count"].Value = intBlock;
}
sqlcmd.CommandText = strSelect;
bytContent = sqlcmd.ExecuteScalar() as byte[];
fs.Write(bytContent,0,intBlock);
intPercent = (int)(((double)(i * intBlock)) / (double)(intLength) * 100);
prgLoader.Value = intPercent;
lblShowPercent.Text = prgLoader.Value.ToString() + "%";
Application.DoEvents();
++i;
}
//将剩余的字节写入流
int intResidual = intLength % intBlock;
if(intResidual > 0)
{
strSelect = "declare @content varbinary(16) "; //再sql中声明获取目标image列内容的句柄变量
strSelect += strTargetHandle; //获取句柄
//锁定并读取指定长度的数据
strSelect += " readtext " + strTableName + "." + strColumnName + " @content @start @count HOLDLOCK";
bytContent = new byte[intResidual];
sqlcmd.Parameters["@start"].Value = intCount * intBlock;
sqlcmd.Parameters["@count"].Value = intResidual;
sqlcmd.CommandText = strSelect;
bytContent = sqlcmd.ExecuteScalar() as byte[];
fs.Write(bytContent,0,intResidual);
}
prgLoader.Value = 100;
lblShowPercent.Text = prgLoader.Value.ToString() + "%";
btnOk.Text = "关闭";
}
}
else
{
if(intCount == 0)
{
strSelect = strTargetSelect;
sqlcmd.CommandText = strSelect;
bytContent = new byte[intLength];
bytContent = sqlcmd.ExecuteScalar() as byte[];
fs.Write(bytContent,0,intLength);
}
else
{
int i = 0;
bytContent = new byte[intBlock];
while(i < intCount)
{
strSelect = "declare @content varbinary(16) "; //再sql中声明获取目标image列内容的句柄变量
strSelect += strTargetHandle; //获取句柄
//锁定并读取指定长度的数据
strSelect += " readtext " + strTableName + "." + strColumnName + " @content @start @count HOLDLOCK";
if(i == 0)
{
//添加@start和@count变量，分别表偏移变量和取的长度
sqlcmd.Parameters.Add("@start",System.Data.SqlDbType.Int).Value = 0;
sqlcmd.Parameters.Add("@count",System.Data.SqlDbType.Int).Value = intBlock;
}
else
{
sqlcmd.Parameters["@start"].Value = i * intBlock;
sqlcmd.Parameters["@count"].Value = intBlock;
}
sqlcmd.CommandText = strSelect;
bytContent = sqlcmd.ExecuteScalar() as byte[];
fs.Write(bytContent,0,intBlock);
++i;
}
//将剩余的字节写入流
int intResidual = intLength % intBlock;
if(intResidual > 0)
{
strSelect = "declare @content varbinary(16) "; //再sql中声明获取目标image列内容的句柄变量
strSelect += strTargetHandle; //获取句柄
//锁定并读取指定长度的数据
strSelect += " readtext " + strTableName + "." + strColumnName + " @content @start @count HOLDLOCK";
bytContent = new byte[intResidual];
sqlcmd.Parameters["@start"].Value = intCount * intBlock;
sqlcmd.Parameters["@count"].Value = intResidual;
sqlcmd.CommandText = strSelect;
bytContent = sqlcmd.ExecuteScalar() as byte[];
fs.Write(bytContent,0,intResidual);
}
}
}
bytContent = null;
fs.Close();
}
catch
{
state = 0;
System.IO.File.Delete(strPath);
bytContent = null;
fs.Close();
return false;
}
state = 0;
return true;
}
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