将长于4000字符的字符串转化为CLOB类型存入数据库

将长于4000字符的字符串转化为CLOB类型存入数据库:
    /// <summary>
    /// 将任务写入数据库
    /// </summary>
    /// <param name="strTB">图元字符串</param>
    /// <param name="strDh">动画字符串</param>
    /// <param name="strCenter">地图中心点</param>
    /// <param name="strJb">地图缩放级别</param>
    /// <returns></returns>
    public bool InsertTsbhInfo(string strTB, string strDh, string strCenter, string strJb, string strMC, string strSsbxbh)
    {
        string content = "tbstring=" + strTB + ";dhstring=" + strDh + ";centerPoint=" + strCenter + ";zoom=" + strJb; 
        //态势标绘表中字段编号
        string strTsbhBH = MisFunciton.GetNewBh("000000", "B_TSBH");
        string sql = "insert into b_tsbh (bh,mc,ssbxbh,content) values('" + strTsbhBH + "','" + strMC + "','" + strSsbxbh + "',:clob)";

        //将字符串类型数据转化为CLOB类型,存入数据库
        OracleConnection conn = new OracleConnection(strConn);
        conn.Open();
        OracleCommand cmd = new OracleCommand(sql, conn);
        OracleParameter op = new OracleParameter("clob", OracleType.Clob);
        op.Value = content;
        cmd.Parameters.Add(op);
        int i = cmd.ExecuteNonQuery();
        if (i > 0)
        {
            return true;
        }
        else
        {