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(); }
