尝试的情况是，提供一个TEXT 框，让用户输入，允许输入非常多的值，保存到Oracle 数据库中。 为了能够大量数据保存，因此，对字段类型设置为 blob 型 。
网络上的类似帮助太复杂了，发现如果只是文件内的操作，还是比较简单的。
思路：
1。先将text 文本转变成2进制
byte[] ddd;
ddd = System.Text.Encoding.Unicode.GetBytes(this.textBox1.Text);
2。再将该2进制存入数据库中，发现这种对数据库的访问方法可行。
cmd.Parameters.Add 。。。
cmd.ExecuteNonQuery();
表结构如下：
create table XLUTEST
(
HHHH BLOB,
GGGG VARCHAR2(10)
)
tablespace SYSTEM
pctfree 10
pctused 40
initrans 1
maxtrans 255
storage
(
initial 64K
minextents 1
maxextents unlimited
)
c# 全部WINFORM 代码如下 ：
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.OleDb;
using System.IO;
namespace blob
{
///
/// Form1 的摘要说明。
///
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.Button button1;
private System.Windows.Forms.Button button2;
private System.Windows.Forms.Button button3;
///
/// 必需的设计器变量。
///
private System.ComponentModel.Container components = null;
public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();
//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}
///
/// 清理所有正在使用的资源。
///
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows 窗体设计器生成的代码
///
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
///
private void InitializeComponent()
{
this.textBox1 = new System.Windows.Forms.TextBox();
this.button1 = new System.Windows.Forms.Button();
this.button2 = new System.Windows.Forms.Button();
this.button3 = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// textBox1
//
this.textBox1.Anchor = System.Windows.Forms.AnchorStyles.Top;
this.textBox1.Location = new System.Drawing.Point(40, 48);
this.textBox1.Multiline = true;
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(576, 272);
this.textBox1.TabIndex = 0;
this.textBox1.Text = "textBox1";
//
// button1
//
this.button1.Location = new System.Drawing.Point(240, 336);
this.button1.Name = "button1";
this.button1.TabIndex = 1;
this.button1.Text = "SAVE";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// button2
//
this.button2.Location = new System.Drawing.Point(408, 344);
this.button2.Name = "button2";
this.button2.TabIndex = 2;
this.button2.Text = "READ";
this.button2.Click += new System.EventHandler(this.button2_Click);
//
// button3
//
this.button3.Location = new System.Drawing.Point(88, 336);
this.button3.Name = "button3";
this.button3.TabIndex = 3;
this.button3.Text = "UPDATE";
this.button3.Click += new System.EventHandler(this.button3_Click);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(648, 397);
this.Controls.Add(this.button3);
this.Controls.Add(this.button2);
this.Controls.Add(this.button1);
this.Controls.Add(this.textBox1);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);
}
#endregion
///
/// 应用程序的主入口点。
///
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
private void button1_Click(object sender, System.EventArgs e)
{
string cnnstr = "provider=OraOLEDB.Oracle;data source=yourdb;User Id=xxxx;Password=xxxx;";
OleDbConnection con = new OleDbConnection(cnnstr);
try
{
con.Open();
}
catch
{}
OleDbCommand cmd = new OleDbCommand(cnnstr,con);
cmd.CommandType=CommandType.Text;
cmd.CommandText=cnnstr;
string txvalue = this.textBox1.Text.Trim();
byte[] expbyte = System.Text.Encoding.Unicode.GetBytes(txvalue);
cmd.CommandText = " insert into xlutest ( hhhh ) values (:hhhh) ";
cmd.Parameters.Add("hhhh",System.Data.OleDb.OleDbType.Binary,expbyte.Length);
cmd.Parameters [0].Value = expbyte;
try
{
cmd.ExecuteNonQuery();
MessageBox.Show("OK");
}
catch ( System.Exception e1 )
{
MessageBox.Show(e1.Message );
}
}
public void ExecwithReturnBinary(string cmdText,string BinaryContent,byte[] byteBlob)
{
string cnnstr = "provider=OraOLEDB.Oracle;data source=yourdb;User Id=xxxx;Password=xxxx;";
OleDbConnection con = new OleDbConnection(cnnstr);
try
{
con.Open();
}
catch
{}
OleDbCommand cmd = new OleDbCommand(cmdText,con);
cmd.CommandType=CommandType.Text;
cmd.CommandText=cmdText;
cmd.Parameters.Add("str",System.Data.OleDb.OleDbType.VarChar,10).Value = "sdfsddf";
cmd.Parameters.Add(BinaryContent,System.Data.OleDb.OleDbType.Binary ,byteBlob.Length).Value= byteBlob;
cmd.ExecuteNonQuery();
}
private void save()
{
// byte[] abyte;
// string str = this.textBox1.Text;
// System.IO.FileStream fs = new FileStream("c:\\xxx.txt",System.IO.FileMode.Open);
// System.IO.BinaryReader br = new BinaryReader(fs);
// abyte = br.ReadBytes(fs.Length);
// br.Close();
}
private void button2_Click(object sender, System.EventArgs e)
{
string strSQL = "select gggg,hhhh from xlutest ";
string cnnstr = "provider=OraOLEDB.Oracle;data source=yourdb;User Id=xxxx;Password=xxxx;";
OleDbConnection con = new OleDbConnection(cnnstr);
try
{
con.Open();
}
catch
{}
OleDbCommand cmd = new OleDbCommand(strSQL,con);
System.Data.OleDb.OleDbDataReader dr = cmd.ExecuteReader();
while ( dr.Read())
{
string dd =dr ["gggg"].ToString();
byte[] ooo = (byte[])dr["hhhh"];
string str ;
str = System.Text.Encoding.Unicode.GetString(ooo);
this.textBox1.Text =str;
}
}
private void button3_Click(object sender, System.EventArgs e)
{
//Decode
// string str ;
// str = System.Text.Encoding.Unicode.GetString(ddd);
string cnnstr = "provider=OraOLEDB.Oracle;data source=yourdb;User Id=xxxx;Password=xxxx;";
OleDbConnection con = new OleDbConnection(cnnstr);
byte[] ddd;
ddd = System.Text.Encoding.Unicode.GetBytes(this.textBox1.Text);
string strSQL = "update xlutest set hhhh=:ddd ";
try
{
con.Open();
}
catch
{}
OleDbCommand cmd = new OleDbCommand(cnnstr,con);
cmd.CommandType=CommandType.Text;
cmd.CommandText=strSQL;
cmd.Parameters.Add("ddd",System.Data.OleDb.OleDbType.Binary ,ddd.Length).Value= ddd;
cmd.ExecuteNonQuery();
MessageBox.Show("OK!");
}
}
}