Oracle 参数赋值

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public void InsertLog(string logview, string table_name,string table_cname)
        {
            string sql = "";
            byte[] buffer = System.Text.Encoding.Default.GetBytes(logview);
            //sql = "UPDATE CAP_LOG SET LOG_TEXT =:LOG_TEXT WHERE TABLE_NAME=:TABLE_NAME";
            sql = string.Format("INSERT INTO CAP_LOG (TABLE_NAME,IMP_DATE,LOG_TEXT,TABLE_CNAME) VALUES (:TABLE_NAME,to_date(:IMP_DATE,'yyyy-mm-dd hh24:mi:ss'),:LOG_TEXT,:TABLE_CNAME)");
            OracleCommand cmd = new OracleCommand(sql, GetSqlConn);
            cmd.Parameters.Add("TABLE_NAME",OracleType.VarChar);
            cmd.Parameters.Add("IMP_DATE",OracleType.VarChar);
            cmd.Parameters.Add("LOG_TEXT", OracleType.Blob);
            cmd.Parameters.Add("TABLE_CNAME", OracleType.VarChar);
            cmd.Parameters[0].Value = table_name;
            cmd.Parameters[1].Value = DateTime.Now.ToString();
            cmd.Parameters[2].Value = buffer;
            cmd.Parameters[3].Value = table_cname;
            try
            {
                cmd.ExecuteNonQuery();
            }
            catch(Exception ee)
            {
                MessageBox.Show("Error",ee.Message);
            }

        }

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