Retrieving Images From A Mysql Longblob Field?
Feb 25, 2011
I store images in mysql as a longblob. The image control only takes an imageurl, so I have to have an ashx page serve up the images and then the image control uses that page as the imageurl. It works, but does that mean I have to do this for each image, kinda gets complicated for a lot of images.
Or should I just store the images on the hard disk? I am worried though about the space I would need if my site grows, as I want it scalable.
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Jul 25, 2010
I want to write one program by visual studio 2008 (C# and ASP) that has web application and windows application.
I want to get clients images in web app(upload) and store them in DB (mysql) then send these images to windows app via web service (so i new web service, not web site). But i have 2 problems:
I have 2 ways to store images in mysql, first i should have BLOB field in DB -that it takes more space-, second i should save just name of each image in DB(so have image in one folder) -in this way i don't know how get image from clients and store them in that folder-. which one? Or what other? How (code) can i transfer image via web service(Byte[] or? ).
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Apr 29, 2010
[Code]....
i am using asp.net with c#, i have table images
shop nvarchar(50),
imgc image
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Jan 21, 2010
I a function that used a mySQL Data Adapter and inserts a new row.
I want the function to return the value of the auto-incremented column of the updated row.
Public Function addRow(ByVal colA as String, ByVal colB as String) As Integer
Dim dbConnection As New MySqlConnection("server=xxx; user id=xxx; password=xxx; database=xxx; pooling=false;")
Dim dbDataAdapter As New MySqlDataAdapter("SELECT * FROM table", dbConnection)
[Code].....
The "Return..." line doesn't work and don't know what the correct code would be.
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Feb 17, 2011
I have an application that uses an Asynchronous HttpHandler for retrieving images from a fileshare It appears the performance of this is quite poor. I have two questions:1. Does it make sense to use an IHttpAsyncHandler for this or will an IHttpHandler work fine? I have four images on a page that need to be loaded this way and it seems that they all load sequentially instead of in parallel. Since we have some JavaScript in the body onload event, it doesn't get excuted until all four images are finished loadingy bearing on this.
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Jan 15, 2010
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Jan 28, 2011
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Sep 17, 2010
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Apr 28, 2010
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May 1, 2010
iam using asp.net with c#
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can you correct my code
[Code]....
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Jul 28, 2010
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Jan 5, 2010
I am facing a problem with retrieving an image and showing it on asp.net grid. I migrated MS Access database to sql server. Image are visible in Crystal report when fetched from the same database (migrated sql server database). But same images are not visible in ASP.Net grid view or simple asp.net image control. Following is my code
SqlConnection oConn =
new
SqlConnection(ConfigurationManager.ConnectionStrings["csr"].ToString());
oConn.Open();
SqlCommand oraCmd = oConn.CreateCommand();
oraCmd.CommandText = "select top 1 photo from [test] where photo is not null";
SqlDataReader dr =
null;
dr = oraCmd .ExecuteReader ();
if(dr.Read ())
if (dr["photo"] !=
null)
{
Response.ContentType = "image/gif";
Response.BinaryWrite((byte[])dr["photo"]);
}
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Dec 29, 2010
I am trying to retrieve the ID (auto incremented) form a Table after I do an insert. I have tried using one of the Variable I used to insert with no success. I am inserting a record with Todays Date (if one does not allready exsist) then trying to read that record to get the AutoInc number (DailyTimeRecordID). Where am I going wrong?
Here is my code
[Code]....
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Dec 24, 2010
I want to fetch date from a datetime field, when i select this field in database i get the result as 'yyyy-mm-dd hh:mm:ss' i want the result to be like dd/mm/yyyy
I am developing website using ASP.net C# using Mysql.query i have made is:
//***to get next date
string nextdatequery = "SELECT next_dt
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Aug 21, 2010
I was wondering how to receive an individual field from my MySQL database.
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The way I am trying to do it at the moment is
[Code]....
This doesn't seem to get a value from the GetValue, but if use
[Code]....
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I can fill the DataGrid its just changing the HeaderText that I am having trouble with.
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Jan 1, 2010
i am looking for some sample code in order to upload and/or retrieve images stored in a database.even the web is full of samples, i was not able to find one without using blobs as i would like to save only the directory of an image when it comes to the place of storing. the reason behind is that i do want to have my database small for some reason and therefore only want to save links to my images inside.
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Jan 9, 2011
i am looking for a very simple way to display images on my form by retrieving them form sql database, by chosing their IDs.
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May 3, 2010
I am using a simple Login function and need to record individual field values from MySQL database to compare with inputs.
My connection code:
Dim myConnection As MySqlConnection
Dim myDataAdapter As MySqlDataAdapter
Dim strSQL As String
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myDataSet = New Dataset()
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GridView1.DataSource = myDataSet
GridView1.DataBind()
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Feb 21, 2011
Using MySQL 5.
In my SAP.NEt project, defined a constant:
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protected static DateTime GetDateTime(DataRow row, string columnName)
{
return (row[columnName] != DBNull.Value) ?
Convert.ToDateTime(row[columnName]) :
Globals.NullDateTime;
}
In the source code:
public DateTime StationFeedTime{ get; set; }
StationFeedTime = GetDateTime(row, "StationFeedTime");
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Got an exception inside the function:
Unable to cast object of type 'System.TimeSpan' to type 'System.IConvertible'.
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Apr 2, 2011
I get an error unsure how to fix it:ERROR [HY000] [MySQL][ODBC 3.51 Driver][mysqld-5.5.9]Column 'UserID' in field list is ambiguous
pblic partial class Search : System.Web.UI.Page
protected void Page_Load(object sender, EventArgs e)
private void PopulateWallPosts(string search)
using (OdbcConnection cn = new OdbcConnection("Driver={MySQL ODBC 3.51 Driver}; Server=localhost; Database=gymwebsite2; User=root; Password=commando;"))
[code]...
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Dec 26, 2010
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Sep 3, 2010
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[Code]....
I dont really know how to use array but willing to try if it is needed.
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Dec 16, 2010
Why does a very simple script which inserts 26,000 records into a mysql database (myisam, no transactions) take 13 seconds in the php implementation, and then 35-50 seconds using mono+mysql connector? I thought asp.net was faster than php? Could the problem be the mono mysql connector is "platform independent", so the performance just stinks? or does asp.net suffer more overhead than php when it comes to executing each query? Aren't there any native linux binaries for mysql connector for mono that may be faster?
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Jan 11, 2010
I have used ASD.NET code using SQL Database for Transaction operation successfully. By changing the Database Code to interface with MYSQL an Error occurs. If I remove the Transaction Code from within the the application, it works OK by displaying the MYSQL data (Read Only) in the layout of the application. I am using Mysql Essential-4.1.22-win32 and MYSQL Connector ODBC-3.51.2. My objective is to EDIT the MYSQL Data.
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Dec 21, 2010
My code is to update a record if it already exists in database else insert as a new record. My code is as follows:
protected void Button3_Click(object sender, EventArgs e)
{
OdbcConnection MyConnection = new OdbcConnection("Driver={MySQL ODBC 3.51 Driver};Server=localhost;Database=testcase;User=root;Password=root;Option=3;");
MyConnection.Open();
String MyString = "select fil_no,orderdate from temp_save where fil_no=? and orderdate=?";
OdbcCommand MyCmd = new OdbcCommand(MyString, MyConnection);
MyCmd.Parameters.AddWithValue("", HiddenField4.Value);
MyCmd.Parameters.AddWithValue("", TextBox3.Text);
using (OdbcDataReader MyReader4 = MyCmd.ExecuteReader())
{
//**
if (MyReader4.Read())
{
String MyString1 = "UPDATE temp_save SET order=? where fil_no=? AND orderdate=?";
OdbcCommand MyCmd1 = new OdbcCommand(MyString1, MyConnection);
MyCmd1.Parameters.AddWithValue("", Editor1.Content.ToString());
MyCmd1.Parameters.AddWithValue("", HiddenField1.Value);
MyCmd1.Parameters.AddWithValue("", TextBox3.Text);
MyCmd1.ExecuteNonQuery();
}
else
{
// set the SQL string
String strSQL = "INSERT INTO temp_save (fil_no,order,orderdate) " +
"VALUES (?,?,?)";
// Create the Command and set its properties
OdbcCommand objCmd = new OdbcCommand(strSQL, MyConnection);
objCmd.Parameters.AddWithValue("", HiddenField4.Value);
objCmd.Parameters.AddWithValue("", Editor1.Content.ToString());
objCmd.Parameters.AddWithValue("", TextBox3.Text);
// execute the command
objCmd.ExecuteNonQuery();
}
}
}
I am getting the error as: ERROR [42000] [MySQL][ODBC 3.51 Driver][mysqld-5.1.51-community]You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'order,orderdate) VALUES ('04050040272009',' &' at line 1
The datatype for fields in table temp_save are:
fil_no-->INT(15)( to store a 15 digit number)
order-->LONGTEXT(to store contents from HTMLEditor(ajax control))
orderdate-->DATE(to store date)
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