Oracle中存取4000字节以上大文本类型可以用此数据类型，其在C#中的读写方法如下：

注意需要引用 System.Data.OracleClient

然后添加命名空间：using System.Data.OracleClient

ORALCE建库脚本：

CREATE TABLE TEST

(

AGREEMENT_ID      CHAR(3) NOT NULL,

AGREEMENT_CONTENT LONG        NULL

)

插入数据：

PRotected void Button1_Click(object sender, EventArgs e)

{

OracleConnection conn = new OracleConnection(@"PassWord=XXXXXX;User ID=hk;Data Source=wealth;Persist Security Info=True");

conn.Open();

OracleCommand cmd = new OracleCommand("Select * From TEST", conn);

string sql = "Insert Into TEST (AGREEMENT_ID, AGREEMENT_CONTENT)   Values(:P_ID,   :P_Value)";

cmd.CommandText = sql;

cmd.Parameters.Add("P_ID", this.TextBox2.Text);

cmd.Parameters.Add("P_Value", this.TextBox1.Text);

cmd.ExecuteNonQuery();

conn.Close();

}

读取数据：

protected void Button2_Click(object sender, EventArgs e)

{

OracleConnection conn = new OracleConnection(@"Password=XXXXXX;User ID=hk;Data Source=wealth;Persist Security Info=True");

conn.Open();

string sql = "Select   *   From   TEST where AGREEMENT_ID = :P_ID";

OracleDataAdapter da = new OracleDataAdapter(sql, conn);

da.SelectCommand.Parameters.Add("P_ID", this.TextBox2.Text);

DataSet ds = new DataSet();

da.Fill(ds);

this.TextBox1.Text = ds.Tables[0].Rows.Count.ToString();

this.TextBox1.Text = ds.Tables[0].Rows[0]["AGREEMENT_CONTENT"].ToString();

conn.Close();

}

资料引用:http://www.knowsky.com/343612.html