The Ring programming language version 1.10 book - Part 54 of 212

1. Ring Documentation, Release 1.10
cellend()
rowend()
rowstart([])
cellstart([ :style = styleheight(30)])
text("Email")
cellend()
cellstart([])
textbox([:name = "email" , :style = stylewidth("100%")])
cellend()
rowend()
rowstart([])
cellstart([ :style = styleheight(30)])
cellend()
cellstart([ :style = styleheight(30)])
submit([:value = "Register" ])
cellend()
rowend()
tableend()
formend()
divend()
divend()
}
Screen Shot:
The Registration response
#!ring -cgi
Load "weblib.ring"
Load "datalib.ring"
Load "ex25_users.ring"
53.22. Users registration and Login 498

2. Ring Documentation, Release 1.10
Import System.Web
oUser = new UsersModel
oUser.Connect()
if oUser.findwith("username",aPageVars["username"])
new page {
text("The user name is already registered")
}
return
ok
if oUser.findwith("email",aPageVars["email"])
new page {
text("This email is already registered")
}
return
ok
aPageVars["salt"] = str2hex(RandBytes(32))
aPageVars["pwhash"] = sha256(aPagevars["password"]+aPageVars["salt"])
aPageVars["sessionid"] = str2hex(randbytes(32))
oUser.Insert()
new page {
cookie("sessionid",aPageVars["sessionid"])
text("New User Created!")
newline()
text("User Name : " + aPageVars["username"])
newline()
}
oUser.Disconnect()
See the next code for the Login page
#!ring -cgi
Load "weblib.ring"
Load "datalib.ring"
Import System.Web
website = "ex28.ring"
new page {
boxstart()
text( "Login")
newline()
boxend()
divstart([:style = stylegradient(6) + stylesize("100%","95%") ])
link([ :url = website, :title = "back" , :style = stylecolor("white")])
newline()
divstart([ :style= styledivcenter("500","130") + stylegradient(52) ])
formpost("ex29.ring")
tablestart([ :Style = stylemarginleft("2%") + stylemargintop("2%") +
stylewidth("90%") ])
rowstart([])
cellstart([:style = stylewidth("20%") + styleheight(30)])
text("User Name")
cellend()
cellstart([ :style = stylewidth("80%") ])
textbox([:name = "username", :style = stylewidth("100%")])
cellend()
53.22. Users registration and Login 499

3. Ring Documentation, Release 1.10
rowend()
rowstart([])
cellstart([ :style = styleheight(30)])
text("Password")
cellend()
cellstart([])
textbox([:name = "password" , :type = "password"])
cellend()
rowend()
rowstart([])
cellstart([ :style = styleheight(30) ])
cellend()
cellstart([])
submit([:value = "Login" ])
cellend()
rowend()
tableend()
formend()
divend()
divend()
}
Screen Shot:
The response page
#!ring -cgi
Load "weblib.ring"
Load "datalib.ring"
Load "ex25_users.ring"
Import System.Web
53.22. Users registration and Login 500

4. Ring Documentation, Release 1.10
oUser = new UsersModel
oUser.Connect()
lResult = oUser.FindWith("username",aPageVars["username"])
new page {
if lResult
if sha256(aPagevars["password"]+oUser.Salt) = oUser.pwhash
text ("Correct Password!")
aPageVars["sessionid"] = str2hex(randbytes(32))
oUser.UpdateColumn("sessionid",aPageVars["sessionid"])
cookie("sessionid",aPageVars["sessionid"])
else
text ("Bad password!")
ok
else
text("Bad User Name!")
ok
}
oUser.Disconnect()
The next code for checking if the user needs to login or not
#!ring -cgi
Load "weblib.ring"
Load "datalib.ring"
Load "ex25_users.ring"
Import System.Web
oUser = new UsersModel
oUser.Connect()
lResult = oUser.FindWith("sessionid",aPageVars["sessionid"])
new page {
if lResult
text("User Name : " + oUser.username )
else
text("Please Login First!")
ok
}
oUser.Disconnect()
53.23 Database, ModelBase & ControllerBase classes
In this section we will see some code from datalib.ring
The next code presents the Database, ModelBase & ControllerBase classes
Import System.Web
Class Database
cServer = "localhost"
cUserName = "root"
cPassword = "root"
cDatabase = "mahdb"
Func Connect
53.23. Database, ModelBase & ControllerBase classes 501

5. Ring Documentation, Release 1.10
con = mysql_init()
mysql_connect(con, cServer, cUserName, cPassWord,cDatabase)
Func Disconnect
mysql_close(con)
Func Query cQuery
mysql_query(con,cQuery)
Func QueryResult
return mysql_result(con)
Func QueryResultWithColumns
# return columns names + query result
return mysql_result2(con)
Func QueryValue
aResult = mysql_result(con)
if islist(aResult) and len(aResult) >= 1
aResult = aResult[1]
if len(aResult) >= 1
return aResult[1]
ok
ok
return 0
Func EscapeString x
if isstring(x)
return MySQL_Escape_String(con,x)
else
return MySQL_Escape_String(con,string(x))
ok
Private
con = NULL
Class ModelBase from Database
cTableName = ""
cSearchColumn = "name"
aColumns = []
aQueryResult = []
ID = 0
# set table name from class name
classname = lower(classname(self))
if right(classname,5) = :model
cTablename = left(classname,len(classname)-5)
ok
Func Insert
cValues = ""
for x in aColumns
cValues += "'" + EscapeString(aPageVars[x]) + "',"
53.23. Database, ModelBase & ControllerBase classes 502

6. Ring Documentation, Release 1.10
Next
cValues = left(cValues,len(cValues)-1) # remove last comma
cColumns = ""
for x in aColumns
cColumns += x + ","
next
cColumns = left(cColumns,len(cColumns)-1)
query("insert into " + cTableName + "("+cColumns+") values (" +
cValues + ")" )
Func Update nID
cStr = ""
for x in aColumns
cStr += x + " = '" + EscapeString(aPageVars[x]) + "' , "
# the space after comma is necessary
Next
cStr = left(cStr,len(cStr)-2)
query("update " + cTableName + " set " + cStr + " where id = " + nID )
Func UpdateColumn cColumn,cValue
query("update " + cTableName + " set " + cColumn + " = '" +
EscapeString(cValue) + "' where id = " + self.ID )
Func Count cValue
query("SELECT count(*) FROM " + cTableName +
" where "+cSearchColumn+" like '" + EscapeString(cValue) + "%'")
return queryValue()
Func Read nStart,nRecordsPerPage
query("SELECT * FROM "+ cTableName+" limit " + EscapeString(nStart) + "," +
EscapeString(nRecordsPerPage) )
aQueryResult = queryResult()
Func Search cValue,nStart,nRecordsPerPage
query("SELECT * FROM "+ cTableName+" where "+cSearchColumn+" like '" +
EscapeString(cValue) + "%'" +
" limit " + EscapeString(nStart) + "," + EscapeString(nRecordsPerPage) )
aQueryResult = queryResult()
Func Find nID
query("select * from " + cTableName + " where id = " + EscapeString(nID) )
aResult = queryResult()[1]
# move the result from the array to the object attributes
ID = nID
cCode = ""
for x = 2 to len(aResult)
cCode += aColumns[x-1] + " = hex2str('" + str2hex(aResult[x]) + "')" + nl
next
eval(cCode)
Func FindWith cColumn,cValue
53.23. Database, ModelBase & ControllerBase classes 503

7. Ring Documentation, Release 1.10
query("select * from " + cTableName + " where "+cColumn+" = '" +
EscapeString(cValue) + "'" )
aResult = queryResult()
if len(aResult) > 0
aResult = aResult[1]
else
return 0
ok
# move the result from the array to the object attributes
ID = aResult[1]
cCode = ""
for x = 2 to len(aResult)
cCode += aColumns[x-1] + " = hex2str('" + str2hex(aResult[x]) + "')" + nl
next
eval(cCode)
return 1
Func Delete ID
query("delete from " + cTableName + " where id = " + EscapeString(ID) )
Func Clear
cCode = ""
for x in aColumns
cCode += x + ' = ""' + nl
next
eval(cCode)
Func LoadModel
# create the columns array
query("SELECT * FROM "+ cTableName + " limit 0,1")
aQueryResult = QueryResultWithColumns()[1]
for x = 2 to len(aQueryResult)
aColumns + lower(trim(aQueryResult[x]))
next
# create attribute for each column
for x in aColumns
addattribute(self,x)
next
Func Connect
Super.Connect()
if nLoadModel = 0
nLoadModel = 1
LoadModel()
ok
private
nLoadModel = 0
Class ControllerBase
53.23. Database, ModelBase & ControllerBase classes 504

8. Ring Documentation, Release 1.10
nRecordsPerPage = 5
nRecordsCount = 0
nPagesCount = 0
nActivePage = 0
# Dynamic creation of oView = new tablenameView and oModel = new tablename.Model
classname = lower(classname(self))
if right(classname,10) = :controller
tablename = left(classname,len(classname)-10)
cCode = "oView = new " + tablename+"View" + nl
cCode += "oModel = new " + tablename+"Model" + nl
eval(cCode)
oModel.connect()
ok
cSearchName = "searchname"
cPart = "part"
cPageError = "The page number is not correct"
cLast = "last"
cOperation = "operation"
cRecID = "recid"
aColumnsNames = ["id"]
for t in oModel.aColumns
aColumnsNames + t
next
cMainURL = website + "?"
func Routing
switch aPageVars[cOperation]
on NULL showtable()
on :add addrecord()
on :save saverecord()
on :delete deleterecord()
on :edit editrecord()
on :update updaterecord()
off
func ShowTable
nRecordsCount = oModel.Count( aPageVars[cSearchName] )
nPagesCount = ceil(nRecordsCount / nRecordsPerPage)
if aPageVars[cPart] = cLast
aPageVars[cPart] = string(nPagesCount)
ok
nActivePage = number(aPageVars[cPart])
if nActivePage = 0 nActivePage = 1 ok
if ( nActivePage > nPagesCount ) and nRecordsCount > 0
ErrorMsg(cPageError)
return
ok
53.23. Database, ModelBase & ControllerBase classes 505

9. Ring Documentation, Release 1.10
nStart = (nActivePage-1)*nRecordsPerPage
if aPageVars[cSearchName] = NULL
oModel.Read( nStart,nRecordsPerPage )
else
oModel.Search( aPageVars[cSearchName],nStart,nRecordsPerPage )
ok
oView.GridView(self)
func AddRecord
oModel.clear()
oView.FormViewAdd(Self,:save,false) # false mean don't include record id
func SaveRecord
oModel.Insert()
oView.SaveView(self)
func EditRecord
oModel.Find( aPageVars[cRecID] )
oView.FormViewEdit(Self,:update,true) # true mean include record id
func UpdateRecord
oModel.update( aPageVars[cRecID] )
oView.UpdateView(self)
func DeleteRecord
oModel.Delete( aPageVars[cRecID] )
oView.DeleteView()
func braceend
oModel.Disconnect()
53.24 WebLib API
In this section we will see the web library functions, classes and methods.
Function Parameters Description
LoadVars None Save the request parameters and cookies to aPageVars List
WebPage None Create new object from the WebPage Class
BootStrapWebPage None Create new object from the BootStrapWebPage Class
HTMLSpecialChars cString Encode Special characters to HTML equivalent
Template cFile,oObject Execute Ring Code in cFile after accessing oObject using {}
Alert cMessage Generate HTML Web Page that display cMessage using JavaScript Alert()
HTML2PDF cString Generate and Display PDF File from HTML String (cString)
The Package System.Web contains the next classes
53.24. WebLib API 506

10. Ring Documentation, Release 1.10
Class Name Description
Application Contains methods for Encoding, Decoding, Cookies & More.
Page Contains methods to generate HTML pages.
ScriptFunctions Contains methods to generate some JavaScript Functions.
StyleFunctions Contains methods to generate CSS.
PageBuffer Generate HTML Page in memory (don’t print the output).
HTML2PDF Generate PDF File from HTML code.
BootStrapPage Using BootStrap Library.
WebPage Generate page using objects for each element.
HtmlPage Like WebPage but doesn’t print the output to stdout.
BootStrapWebPage Generate page using objects, using BootStrap Library.
ObjsBase Parent Class for page objects.
NewObjectsFunctions Methods to create new objects in the page or element.
H1 Wraps HTML H1.
H2 Wraps HTML H2.
H3 Wraps HTML H3.
H4 Wraps HTML H4.
H5 Wraps HTML H5.
H6 Wraps HTML H6.
P Wraps HTML P.
Link Wraps HTML link.
NewLine Wraps HTML NewLine.
Div Wraps HTML Div.
Form Wraps HTML Form.
Input Wraps HTML Input.
TextArea Wraps HTML TextArea.
Select Wraps HTML Select.
Option Wraps HTML Option.
Image Wraps HTML Image.
UL Wraps HTML UL.
LI Wraps HTML LI.
Table Wraps HTML Table.
TR Wraps HTML TR.
TD Wraps HTML TD.
TH Wraps HTML TH.
Audio Wraps HTML Audio.
Video Wraps HTML Video.
Nav Wraps HTML Nav.
Span Wraps HTML Span.
Button Wraps HTML Button.
53.24. WebLib API 507