I'm using 3 filters in my lightning component to want to show data all together,i.e. record should be displayed after filtering through all filters - sql

Question

I have created a lightning component with 3 filters- one for searching listview, one from dropdown (picklist) and third by searching the name. I'm able to make it work by individual search but for combining have been asked to use dynamic SQL in apex by passing the string in apex class. So here's code is attached of class .But I don't know how to move forward.
public with sharing class ApexSearchForm {
#AuraEnabled
public static List<Asset__c> fetchAccounts(String status, String v) {
String a= 'Recently Viewed Assets';
String b='All Assets';
String c='Choose One';
List<Asset__c> accList = new List<Asset__c>();
if(String.isNotBlank(status)){
accList = [SELECT Name, Status__c, Description__c, Executive_Sponsor__c, Documentation_Link__c,Video_Link__c,Source_Code_Link__c
FROM Asset__c
WHERE Status__c = :status];
}if(String.isBlank(status)){
accList = [SELECT Name, Status__c, Description__c, Executive_Sponsor__c, Documentation_Link__c, Video_Link__c,Source_Code_Link__c
FROM Asset__c LIMIT 100];
}if(v == a){
accList = [SELECT Id, Name, Description__c, Submitted_Date__c, Documentation_Link__c, Source_Code_Link__c,Video_Link__c,Status__c
FROM Asset__c
WHERE LastViewedDate != NULL
ORDER BY LastViewedDate DESC LIMIT 5];
}else if(v==b){
accList = [SELECT Id, Name, Description__c, Submitted_Date__c, Documentation_Link__c, Source_Code_Link__c,Video_Link__c,Status__c
FROM Asset__c
ORDER BY Name ASC ];
}else if(v==c){
accList = [SELECT Id, Name, Description__c, Submitted_Date__c, Documentation_Link__c, Source_Code_Link__c,Video_Link__c,Status__c
FROM Asset__c ];
}else if(String.isNotBlank(status) && v==a){
accList=[SELECT Id, Name, Description__c, Submitted_Date__c, Documentation_Link__c, Source_Code_Link__c,Video_Link__c,Status__c
FROM Asset__c
WHERE Status__c = :status
ORDER BY LastViewedDate DESC];
}
return accList;
}
#AuraEnabled
public static Map<String, String> getStatusFieldValue(){
Map<String, String> options = new Map<String, String>();
Schema.DescribeFieldResult fieldResult = Asset__c.Status__c.getDescribe();
List<Schema.PicklistEntry> pValues = fieldResult.getPicklistValues();
for (Schema.PicklistEntry p: pValues) {
options.put(p.getValue(), p.getLabel());
}
return options;
}
}

Answer 1

Assuming that you pass correctly the parameters from frontend to the controller, you can do something like:
public static List<Asset__c> fetchAccounts(String status, String v) {
String a= 'Recently Viewed Assets';
String b='All Assets';
String query = 'SELECT Name, Status__c, Description__c, Executive_Sponsor__c, Documentation_Link__c,Video_Link__c,Source_Code_Link__c FROM Asset__c';
if(String.isNotBlank(status) || v != null){
query += ' WHERE';
if(String.isNotBlank(status)){
query += ' Status__c = :status';
}
if(v != null){
query += ' ORDER BY';
if(v == a){
query += ' LastViewedDate DESC';
if(String.isNotBlank(status)){
query += ' LIMIT 5';
}
} else if(v == b){
query += ' Name ASC';
}
}
} else {
query += ' LIMIT 100';
}
List<Asset__c> accList = Database.query(query);
return accList;
}