This document contains code for classes that provide functionality for database operations and model-view-controller (MVC) patterns in Ring. The Database class handles database connections and queries. The ModelBase class extends Database and provides methods for CRUD operations on a database table based on the class name. The ControllerBase class sets up an associated view and model based on its class name and provides routing functionality. Together these classes provide a framework for building MVC-based applications with Ring that interact with a database.

1. Ring Documentation, Release 1.5.4
aColumnsNames = ["id","username","email"]
Func UpdateRecord
oModel.id = aPageVars[cRecID]
oModel.updatecolumn("username", aPageVars[:username] )
oModel.updatecolumn("email", aPageVars[:email] )
oView.UpdateView(self)
Class UsersView from ViewBase
oLanguage = new UsersLanguageEnglish
Func AddFuncScript oPage,oController
return oPage.scriptfunc("myadd",oPage.scriptredirection("ex26.ring"))
Func FormViewContent oController,oTranslation,oPage
return [
[oTranslation.aColumnsTitles[2],"textbox","username",
oController.oModel.UserName,oPage.stylewidth("100%")],
[oTranslation.aColumnsTitles[3],"textbox","email",
oController.oModel.Email,oPage.stylewidth("50%")]
]
Class UsersLanguageEnglish
cTitle = "Users Table"
cBack = "back"
aColumnsTitles = ["ID","User Name","Email"]
cOptions = "Options"
cSearch = "Search"
comboitems = ["Select Option...","Edit","Delete"]
cAddRecord = "Add Record"
cEditRecord = "Edit Record"
cRecordDeleted = "Record Deleted!"
aMovePages = ["First","Prev","Next","Last"]
cPage = "Page"
cOf = "of"
cRecordsCount = "Records Count"
cSave = "Save"
temp = new page
cTextAlign = temp.StyleTextRight()
cNoRecords = "No records!"
In the file ex25.ring we load ex25_users.ring then create an object from UsersController class.
Using the created object, we call the routing method.
#!c:ringbinring.exe -cgi
Load "weblib.ring"
Load "datalib.ring"
Load "ex25_users.ring"
Import System.Web
website = "ex25.ring"
New UsersController { Routing() }
Screen Shot:
47.22. Users registration and Login 405

2. Ring Documentation, Release 1.5.4
See the next code for the registration page
#!c:ringbinring.exe -cgi
Load "weblib.ring"
Load "datalib.ring"
Import System.Web
website = "ex26.ring"
new page {
boxstart()
text( "Register")
newline()
boxend()
divstart([:style = stylegradient(6) + stylesize("100%","95%") ])
link([ :url = website, :title = "back" , :style = stylecolor("white")])
newline()
divstart([ :style= styledivcenter("500","160") + stylegradient(52) ])
formpost("ex27.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()
rowend()
rowstart([])
cellstart([ :Style = styleheight(30)])
text("Password")
cellend()
cellstart([])
textbox([:name = "password" , :type = "password"])
47.22. Users registration and Login 406

3. Ring Documentation, Release 1.5.4
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
#!c:ringbinring.exe -cgi
Load "weblib.ring"
Load "datalib.ring"
Load "ex25_users.ring"
47.22. Users registration and Login 407

4. Ring Documentation, Release 1.5.4
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
#!c:ringbinring.exe -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()
47.22. Users registration and Login 408

5. Ring Documentation, Release 1.5.4
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
#!c:ringbinring.exe -cgi
Load "weblib.ring"
Load "datalib.ring"
Load "ex25_users.ring"
Import System.Web
47.22. Users registration and Login 409

6. Ring Documentation, Release 1.5.4
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
#!c:ringbinring.exe -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()
47.23 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
47.23. Database, ModelBase & ControllerBase classes 410

7. Ring Documentation, Release 1.5.4
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]) + "',"
47.23. Database, ModelBase & ControllerBase classes 411

8. Ring Documentation, Release 1.5.4
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
47.23. Database, ModelBase & ControllerBase classes 412

9. Ring Documentation, Release 1.5.4
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
47.23. Database, ModelBase & ControllerBase classes 413

10. Ring Documentation, Release 1.5.4
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
47.23. Database, ModelBase & ControllerBase classes 414