Hi!
I have following code which reads a blob value from mydb (datatype longblob, mysql 5.0, data size 512kB):
s = "SELECT fldBild FROM tblA WHERE fldID=1"
reader = g_DB.mySQLExecuteReader(s)
Do While reader.Read
blob = reader.GetMySqlBlob(0)
m_bytBild = blob.Value
Loop
reader.Close()
This works fine, but in some cases the program freezes in the line with reader.Read. CPU is at 0%, db process is on SLEEP state...
Freeze when reading blob value
-
Serious
Additional Infos
NET Framework is 1.1
CoreLab Version is 3.20.5.0
MySQL is 5.0.16
Table definition:
CREATE TABLE `wunde_verlauf` (
`fldWundeVerlaufID` int(11) NOT NULL auto_increment,
`fldDatum` datetime default NULL,
`fldGroesse` text,
`fldKommentar` text,
`fldBild` mediumblob NOT NULL,
`fldWundbeschaffenheitRef` int(11) default NULL,
`fldWundeRef` int(11) default NULL,
`fldErsterWert` int(11) default NULL,
`fldUserRef` int(11) default NULL,
`fldAenderungsdatum` datetime default NULL,
`fldGeloescht` tinyint(4) default '0',
`fldIstLetzter` tinyint(4) default NULL,
PRIMARY KEY (`fldWundeVerlaufID`),
KEY `fldWundeRef` (`fldWundeRef`),
KEY `fldWundbeschaffenheitRef` (`fldWundbeschaffenheitRef`),
KEY `fldErsterWert` (`fldErsterWert`),
KEY `fldUserRef` (`fldUserRef`),
KEY `fldGeloescht` (`fldGeloescht`),
KEY `fldIstLetzter` (`fldIstLetzter`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
Code fragment:
Dim s As String
Dim reader As MySqlDataReader
Dim blob As MySqlBlob
Dim cmd As new MySqlCommand
s = "SELECT fldBild FROM wunde_verlauf WHERE fldWundeVerlaufID=" & Me.WundeVerlaufID
openConnection(s)
cmd.Connection = m_dbConnection
cmd.CommandText = s
cmd.CommandType = CommandType.Text
CoreLab Version is 3.20.5.0
MySQL is 5.0.16
Table definition:
CREATE TABLE `wunde_verlauf` (
`fldWundeVerlaufID` int(11) NOT NULL auto_increment,
`fldDatum` datetime default NULL,
`fldGroesse` text,
`fldKommentar` text,
`fldBild` mediumblob NOT NULL,
`fldWundbeschaffenheitRef` int(11) default NULL,
`fldWundeRef` int(11) default NULL,
`fldErsterWert` int(11) default NULL,
`fldUserRef` int(11) default NULL,
`fldAenderungsdatum` datetime default NULL,
`fldGeloescht` tinyint(4) default '0',
`fldIstLetzter` tinyint(4) default NULL,
PRIMARY KEY (`fldWundeVerlaufID`),
KEY `fldWundeRef` (`fldWundeRef`),
KEY `fldWundbeschaffenheitRef` (`fldWundbeschaffenheitRef`),
KEY `fldErsterWert` (`fldErsterWert`),
KEY `fldUserRef` (`fldUserRef`),
KEY `fldGeloescht` (`fldGeloescht`),
KEY `fldIstLetzter` (`fldIstLetzter`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
Code fragment:
Dim s As String
Dim reader As MySqlDataReader
Dim blob As MySqlBlob
Dim cmd As new MySqlCommand
s = "SELECT fldBild FROM wunde_verlauf WHERE fldWundeVerlaufID=" & Me.WundeVerlaufID
openConnection(s)
cmd.Connection = m_dbConnection
cmd.CommandText = s
cmd.CommandType = CommandType.Text
problem solved - but still unsatisfied
The problem was the compression of the connection object. When I disable compression, everything works fine.
I am using corelab.mysql.dll version 3.20.5.0, I thought this version could handle the compression feature???
I am using corelab.mysql.dll version 3.20.5.0, I thought this version could handle the compression feature???