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{ Rendering Function By Custom SQL}
unit render_custom_request;
{$mode ObjFPC}{$H+}
interface
uses
Classes, SysUtils, SQLite3Conn, SQLDB, db_helpers, RenderHtml, regexpr;
(*
Usage:
output := renderCustomRequest(
'@db(id,name,email|users|age>18)=>(<div>{name} - {email}</div>);',
conn, trans, query
);
The function:
Parses the request expression using regex to extract fields, table, condition, and template
Builds and executes the SQL query
For each record in the result set:
Sets variables in the renderer based on field values
Renders the template with these variables
Appends the result to the output string
Returns the concatenated rendered output
*)
function renderCustomRequest(requestExpression: String; var konnect: TSQLite3Connection;
var tranzact: TSQLTransaction; var sQ: TSQLQuery): String;
{
This function:
Uses regex to find all @db(...)=>(...); patterns in the input string
For each match, calls renderCustomRequest to get the rendered HTML
Replaces the original request with its rendered output
Returns the fully processed string
}
function renderAllCustomRequests(t: String; var konnect: TSQLite3Connection;
var tranzact: TSQLTransaction; var sQ: TSQLQuery): String;
implementation
function renderCustomRequest(requestExpression: String; var konnect: TSQLite3Connection;
var tranzact: TSQLTransaction; var sQ: TSQLQuery): String;
var
regex: TRegExpr;
fieldsPart, tablePart, conditionPart, templatePart: String;
fields: TStringList;
sqlRequest: String;
renderer: Render;
i: Integer;
output: String;
item : String;
fileWriter : TStringList;
begin
fileWriter := TStringList.Create;
output := '';
// Initialize regular expression to parse the request
regex := TRegExpr.Create;
// Pattern to match @db(...)=>(...) format
regex.Expression := '@db\(([^|]+)\|([^|]+)\|([^)]*)\)=>\((.*)\);?';
if regex.Exec(requestExpression) then
begin
// Extract parts from the request expression
fieldsPart := regex.Match[1];
tablePart := regex.Match[2];
conditionPart := regex.Match[3];
templatePart := regex.Match[4];
fileWriter.Add('fields detected: '+fieldsPart);
fileWriter.Add('table detected:' + tablePart);
fileWriter.Add('condition detected ' + conditionPart);
fileWriter.Add('template part is '+templatePart);
// Split fields into a list
fields := TStringList.Create;
fields.StrictDelimiter := True;
fields.Delimiter := ',';
fields.DelimitedText := fieldsPart;
// Build SQL query
sqlRequest := 'SELECT ' + fieldsPart + ' FROM ' + tablePart;
if conditionPart <> '' then
sqlRequest := sqlRequest + ' WHERE ' + conditionPart;
fileWriter.add('Construct sql request is ' + sqlRequest);
// Execute the query
open_sql(sqlRequest, sQ);
// Process each record
sQ.First;
while not sQ.EOF do
begin
// Create renderer
renderer := Render.Create;
renderer.setTemplate(templatePart);
// Set variables for current record
for i := 0 to fields.Count - 1 do
begin
fileWriter.Add(fields[i] + ' has value ' + sQ.FieldByName(fields[i]).AsString);
renderer.setVar(fields[i], sQ.FieldByName(fields[i]).AsString);
end;
// Render and append to output
item := renderer.getHtml();
renderer.Free;
fileWriter.Add('item render ' + item);
output := output + item;
sQ.Next;
end;
end;
fields.Free;
regex.Free;
fileWriter.Add(output);
fileWriter.SaveToFile('render_custom_request.log');
fileWriter.Free;
Result := output;
end;
function renderAllCustomRequests(t: String; var konnect: TSQLite3Connection;
var tranzact: TSQLTransaction; var sQ: TSQLQuery): String;
var
regex: TRegExpr;
startPos, endPos: Integer;
request, rendered: String;
output: String;
begin
output := t;
regex := TRegExpr.Create;
try
// Pattern to match @db(...)=>(...);
regex.Expression := '@db\([^)]+\)=>\([^)]+\)\;?';
// Find and process all matches
if regex.Exec(t) then
begin
repeat
// Get the full matched request
request := regex.Match[0];
// Render this single request
rendered := renderCustomRequest(request, konnect, tranzact, sQ);
// Replace the original request with rendered output
output := StringReplace(output, request, rendered, []);
until not regex.ExecNext;
end;
finally
regex.Free;
end;
Result := output;
end;
end.
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