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/Java/JavaDatabase/java Database Thread Tests
Required plugins for this example: MBS Java Plugin
You find this example project in your Plugins Download as a Xojo project file within the examples folder: /Java/JavaDatabase/java Database Thread Tests
This example is the version from Thu, 6th Apr 2016.
Project "java Database Thread Tests.xojo_binary_project"
Class App Inherits Application
Const kEditClear = "&Delete"
Const kFileQuit = "&Quit"
Const kFileQuitShortcut = ""
EventHandler Sub Close()
if SQLiteDB<>Nil then
SQLiteDB.Close
end if
if j<>Nil then
j.close
end if
End EventHandler
EventHandler Sub Open()
dim f as FolderItem = FindFile("sqlitejdbc-v056.jar")
if not f.Exists then
MsgBox "Missing sqlite connector classes!"
Quit
end if
dim file as FolderItem = FindFile("SQLite.rsd")
v = new JavaVMMBS(f)
d = new JavaDatabaseMBS(v,"org.sqlite.JDBC")
dim path as string
#if RBVersion < 2013 then
path = file.UnixpathMBS
#else
path = file.NativePath
#endif
j = d.getConnection("jdbc:sqlite:"+path)
if j = Nil then
MsgBox "Cannot connect to sqlite Database"
Quit
end if
SQLiteDB = New REALSQLDatabase // or SQLiteDatabase
SQLiteDB.databaseFile = file
if SQLiteDB.databaseFile.Exists then
if Not SQLiteDB.Connect then
MsgBox "Cannot connect to SQLite Database"
Quit
end if
else
MsgBox "Missing Database File!"
Quit
end
Exception e as JavaExceptionMBS
MsgBox e.message+" errorcode: "+str(e.ErrorNumber)
End EventHandler
Function FindFile(name as string) As FolderItem
// Look for file in parent folders from executable on
dim parent as FolderItem = app.ExecutableFile.Parent
while parent<>Nil
dim file as FolderItem = parent.Child(name)
if file<>Nil and file.Exists then
Return file
end if
parent = parent.Parent
wend
End Function
Property SQLiteDB As REALSQLDatabase
Property d As JavaDatabaseMBS
Property j As JavaConnectionMBS
Property v As JavaVMMBS
End Class
Class Window1 Inherits Window
Control Thread1 Inherits Thread
ControlInstance Thread1 Inherits Thread
EventHandler Sub Run()
Dim rs As JavaResultSetMBS
rs = App.j.MySelectSQL("SELECT * FROM master")
if rs <> NIL Then
if rs.NextRecord Then
data = rs.getString("str1") + " , " + rs.getString("str2") + " , " + rs.getString("str3") + " , " + rs.getString("str4")
end if
end if
Timer1.Mode = 1
Timer1.Enabled = True
app.j.vm.FreeCurrentThread
End EventHandler
End Control
Control PushButton1 Inherits PushButton
ControlInstance PushButton1 Inherits PushButton
EventHandler Sub Action()
Thread1.Run
End EventHandler
End Control
Control PushButton2 Inherits PushButton
ControlInstance PushButton2 Inherits PushButton
EventHandler Sub Action()
Thread2.Run
End EventHandler
End Control
Control PushButton3 Inherits PushButton
ControlInstance PushButton3 Inherits PushButton
EventHandler Sub Action()
quit
End EventHandler
End Control
Control Thread2 Inherits Thread
ControlInstance Thread2 Inherits Thread
EventHandler Sub Run()
Dim rs As RecordSet
rs = App.SQLiteDB.SQLSelect("SELECT * FROM master")
If App.SQLiteDB.Error Then
data = "DB Error : " + App.SQLiteDB.ErrorMessage
else
if rs <> Nil Then
if Not rs.EOF Then
data = rs.Field("str1").StringValue + " , " + rs.Field("str2").StringValue + " , " + rs.Field("str3").StringValue + " , " + rs.Field("str4").StringValue
end if
rs.Close
end if
end if
Timer1.Mode = 1
Timer1.Enabled = True
End EventHandler
End Control
Control Timer1 Inherits Timer
ControlInstance Timer1 Inherits Timer
EventHandler Sub Action()
TextField1.Text = data
End EventHandler
End Control
Control TextField1 Inherits TextField
ControlInstance TextField1 Inherits TextField
End Control
Control PushButton4 Inherits PushButton
ControlInstance PushButton4 Inherits PushButton
EventHandler Sub Action()
Thread3.Run
End EventHandler
End Control
Control Thread3 Inherits Thread
ControlInstance Thread3 Inherits Thread
EventHandler Sub Run()
Dim rs As JavaResultSetMBS
Dim blob As JavaBlobMBS
rs = App.j.MySelectSQL("SELECT * FROM master")
if rs <> NIL Then
if rs.NextRecord Then
blob = rs.getBlob("blb1")
data = blob.getBytes(0, blob.length)
end if
end if
Timer1.Mode = 1
Timer1.Enabled = True
app.j.vm.FreeCurrentThread
End EventHandler
End Control
Property data As String
End Class
MenuBar MainMenuBar
MenuItem FileMenu = "&File"
MenuItem FileQuit = "#App.kFileQuit"
MenuItem EditMenu = "&Edit"
MenuItem EditUndo = "&Undo"
MenuItem EditSeparator1 = "-"
MenuItem EditCut = "Cu&t"
MenuItem EditCopy = "&Copy"
MenuItem EditPaste = "&Paste"
MenuItem EditClear = "#App.kEditClear"
MenuItem EditSeparator2 = "-"
MenuItem EditSelectAll = "Select &All"
End MenuBar
Module JavaUtil
Sub ExecuteSQL(extends c as JavaConnectionMBS, sql as string)
try
dim s as JavaStatementMBS
s=c.createStatement
if s<>nil then
call s.executeUpdate sql
end if
catch d as JavaExceptionMBS
MsgBox d.message+" ErrorCode: "+str(d.errornumber)
end try
End Sub
Sub MyExecuteSQL(extends j as javaconnectionMBS, sql as string)
try
j.ExecuteSQL sql
catch d as JavaExceptionMBS
MsgBox d.message+" ErrorCode: "+str(d.errornumber)
end try
End Sub
Sub MyExecuteSQLwithPreparedStatement(extends j as javaconnectionMBS, sql as string)
try
dim p as JavaPreparedStatementMBS
p=j.prepareStatement(sql)
if p<>Nil then
call p.execute
end if
catch d as JavaExceptionMBS
MsgBox d.message+" ErrorCode: "+str(d.errornumber)
end try
End Sub
Function MySelectSQL(extends j as javaconnectionMBS, sql as string, editable as boolean=false) As JavaResultSetMBS
try
return j.SelectSQL(sql,editable)
catch d as JavaExceptionMBS
MsgBox d.message
end try
End Function
Function MySelectSQLwithPreparedStatement(extends j as javaconnectionMBS, sql as string, editable as boolean=false) As JavaResultSetMBS
try
dim p as JavaPreparedStatementMBS
p=j.prepareStatement(sql)
if p<>Nil then
dim r as JavaResultSetMBS
r=p.executeQuery
r.Tag=p // keep a reference to the statement
Return r
end if
catch d as JavaExceptionMBS
MsgBox d.message
end try
End Function
Function SelectSQL(extends c as JavaConnectionMBS, sql as string, editable as boolean=false) As JavaResultSetMBS
try
dim mode as integer = c.CONCUR_READ_ONLY
dim s as JavaStatementMBS
s=c.createStatement(c.TYPE_FORWARD_ONLY, mode)
if s<>nil then
dim r as JavaResultSetMbs
r=s.executeQuery(sql)
if r<>Nil then
// you need to keep the statement with the
r.Tag=s
Return r
end if
end if
catch d as JavaExceptionMBS
MsgBox d.message+" ErrorCode: "+str(d.errornumber)
end try
End Function
End Module
End Project
The items on this page are in the following plugins: MBS Java Plugin.
