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我有包含 clob 列的表。我想将 HTML 数据保存到那个（c#）中。当我保存时，我收到一个错误：字符串文字太长。我存储的字符串长度是 8048 个字符

谁能帮我？在此先感谢表是： CREATE TABLE tblhelp ( GRID LONG )

 private string getHTML(GridView gv)
{
    StringBuilder sb = new StringBuilder();
    StringWriter textwriter = new StringWriter(sb);
    HtmlTextWriter htmlwriter = new HtmlTextWriter(textwriter);
    gv.RenderControl(htmlwriter);
    htmlwriter.Flush();
    textwriter.Flush();
    htmlwriter.Dispose();
    textwriter.Dispose();
    return sb.ToString();
}
public override void VerifyRenderingInServerForm(Control control)
{
    /* Confirms that an HtmlForm control is rendered for the specified ASP.NET
       server control at run time. */
    return;
}
protected void btnTest_Click(object sender, EventArgs e)
{
 //   string grid = getHTML(GridView1);
   TextBox7.Text = getHTML(GridView1);    
    OdbcConnection DbConnection1 = new OdbcConnection(con1);
    try
    {
        DbConnection1.Open();
        OdbcCommand DbCommand1 = DbConnection1.CreateCommand();
        //DbCommand1.CommandText = "UPDATE TBL_ITHELPDESK SET STATUS='"+ chkClosed.Text +"',CLOSED_BY='"+drpClosedBy.Text+"',CLOSED_ON=TO_DATE('"+txtClosedOn.Text.ToString().Trim()+"','MM-DD-YYYY')WHERE CALL_NO='" + txtCallNo.Text + "'";
        DbCommand1.CommandText = "insert into tblhelp(grid) values('" + TextBox7.Text.Replace("'", "''").Trim() + "')";
    TextBox7.Text=DbCommand1.CommandText.ToString();
        int t1 = DbCommand1.ExecuteNonQuery();
        if (t1 == 1)
        {
            DbConnection1.Close();

        }
        else
        {
        }
    }
    catch (Exception ex)
    {

    }
}
4

2 回答 2

3

字符串文字限制为 4000 个字节。如果您尝试将数据插入到 中CLOB，您的代码将需要使用绑定变量并绑定 LOB 数据（出于与安全性和性能相关的许多其他原因，您应该这样做）。您收到的错误强烈暗示您正在执行类似在包含要插入的文字数据的字符串中构建 SQL 语句的操作。

于 2013-06-20T10:42:08.860 回答
2

使用命令参数：

try
{
    DbConnection1.Open();
    OdbcCommand DbCommand1 = DbConnection1.CreateCommand();
    DbCommand1.CommandText = "INSERT INTO tblhelp (grid) VALUES (?)";
    OdbcParameter param1 = new OdbcParameter("param1", OdbcType.VarChar);
    param1.Value = TextBox7.Text;
    DbCommand1.Parameters.Add(param1);
    Int32 t1 = DbCommand1.ExecuteNonQuery();
    if (t1 == 1)
    {
        DbConnection1.Close();
    }
    else
    {
    }
}
catch (Exception ex)
{
    //do something!
}
于 2013-06-20T11:07:03.413 回答