vb.net - table.keyfield=table.field2 gives (0x80131904): An expression of non-boolean type specified in a context where a condition is expected -

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first post

i have been struggling hours today , have not been able find on web.

i have vb.net program runs query string read configuration file needs configurable (not problem). queries work fine below code long there no clause '=' isn't boolean. (ex table1.fieldkey=table2.key)

i error: system.data.sqlclient.sqlexception (0x80131904): expression of non-boolean type specified in context condition expected, near 'key'.

code:

public sub doquery() dim cn new sqlconnection(), cmd new sqlcommand(), schematable datatable, myreader sqldatareader, myadapter new sqldataadapter()     dim myfield datarow, myproperty datacolumn     dim j integer = 0     dim queryoutput new datatable     'open connection sql server     cn.connectionstring = connectstring     cn.open()     'retrieve records     cmd.connection = cn     cmd.commandtext = query     try         myreader = cmd.executereader()     catch ex exception         writelog("an error occured. check sql query" & chr(13) & ex.tostring)         exit sub     end try using cn         myadapter.selectcommand = cmd         myadapter.fill(queryoutput)     end using cn.close() end sub

query:

select ta.[key], ta.name, ta.currentstationkey station, te.discriminator type, ta.material, ta.materialdescription  trackedassets ta, trackingevents te  ta.[key]=te.assetkey

what doing wrong? seems connection string can't handle field=field.


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