I have two query and resultsets, in the below code I want to showcase that for a particular userGroupCode
I have certain userPreference
and employee
associated with it. I have written the code below code to display the userGroupCode
object:
String query1= "SELECT ug.userGroupCode, ug.userGroupDesc, up.userPreference"
+ "FROM dbo.UserGroup_link ug INNER JOIN dbo.UserPreference up ON ug.userGroupCode = up.userGroupCode";
userGroupCode | userGroupDesc | userPreference |
---|---|---|
A100 | Finance | Mumbai |
A100 | Finance | Bangalore |
A200 | Supply Chain | Chennai |
A201 | Marketing | Delhi |
A201 | Marketing | Kolkata |
A300 | Health | Indore |
String query2= "SELECT ug.userGroupCode, ug.userGroupDesc, emp.employee_id,emp.name,emp.role"
+ "FROM dbo.UserGroup ug INNER JOIN dbo.employee emp ON ug.userGroupCode = emp.userGroupCode";
userGroupCode | userGroupDesc | employee_id | name | role |
---|---|---|---|---|
A100 | Finance | 101 | Foo1 | Developer |
A100 | Finance | 101 | Foo1 | Team Lead |
A200 | Supply Chain | 091 | Test1 | Manager |
A201 | Marketing | 591 | User1 | Analyst |
A201 | Marketing | 1001 | Boo1 | Scrum Master |
A300 | Health | 1001 | Boo1 | Developer |
I have class UserGroupMapping
like:
public class UserGroupMapping {
private String userGroupCode;
private String userGroupCode;
private List<String> userPreference;
private List<Employee> emp;
//getter and setter
}
Another class for Employee
is:
public class Employee {
private String employee_id;
private String name;
private List<String> role;
//getter and setter
}
In my stored procedure class I am calling these queries with the help of jdbcTemplate.query()
;
String userCode = null;
List<String> userPreferenceList = new ArrayList<>();
List<UserGroupMapping> userGroupMappingList = new ArrayList<>();
List<UserGroupMapping> userGroupMappingList1 = new ArrayList<>();
UserGroupMapping userGroupMapping = new UserGroupMapping();
List<Employee> employeeList = new ArrayList<>();
Employee emp = new Employee();
UserGroupMapping userGroupMapping1 = new UserGroupMapping();
jdbcTemplate.query(query1, (rs)->{
String user_group_code = rs.getString("userGroupCode");
String user_group_desc = rs.getString("userGroupDesc");
String user_preference = rs.getString("userPreference");
if(userCode == null){
userGroupMapping.setUserGroupCode(user_group_code);
userGroupMapping.setUserGroupDesc(user_group_desc);
userPreferenceList.add(userPreference);
userCode = user_group_code;
} else if (userCode.equals(user_group_code)) {
userPreferenceList.add(userPreference);
} else {
userGroupMapping.setUserPreference(userPreferenceList);
userGroupMappingList.add(userGroupMapping);
userPreferenceList = new ArrayList<>();
userGroupMapping = new userGroupMapping();
userGroupMapping.setUserGroupCode(user_group_code);
userGroupMapping.setUserGroupDesc(user_group_desc);
userPreferenceList.add(userPreference);
userCode = user_group_code;
}});
userCode = null;
userGroupMapping.setUserPreference(userPreferenceList);
userGroupMappingList.add(userGroupMapping);
jdbcTemplate.query(query2, (rs)->{
String user_group_code = rs.getString("userGroupCode");
String user_group_desc = rs.getString("userGroupDesc");
String emp_id = rs.getString("employee_id");
String name = rs.getString("name");
if(userCode == null){
userGroupMapping1.setUserGroupCode(user_group_code);
userGroupMapping1.setUserGroupDesc(user_group_desc);
emp.setId(employeeId);
emp.setName(name);
employeeList.add(emp);
userCode = user_group_code;
} else if (userCode.equals(user_group_code)) {
Employee emp = new Employee();
emp.setId(employeeId);
emp.setName(name);
employeeList.add(emp);
} else {
userGroupMapping1.setEmployee(employeeList);
userGroupMappingList1.add(userGroupMapping1);
employeeList = new ArrayList<>();
userGroupMapping1 = new userGroupMapping();
Employee emp = new Employee();
userGroupMapping1.setUserGroupCode(user_group_code);
userGroupMapping1.setUserGroupDesc(user_group_desc);
emp.setId(employeeId);
emp.setName(name);
employeeList.add(emp);
userCode = user_group_code;
}});
userGroupMapping1.setEmployee(employeeList);
userGroupMappingList1.add(userGroupMapping1);
List<UserGroupMapping> ugList = Stream.concat(userGroupMappingList.stream, userGroupMappingList1.stream).distinct().collect(Collectors.toList())
return ugList;
The problem is that I want my output to be like :
[
{
"userGroupCode" : "A100",
"userGroupDesc" : "Finance",
"userPreference": ["Mumbai","Bangalore"],
"Employee" : [
"employee_id" : "101",
"name" : "Foo1",
"role" : ["Developer","Team Lead"]
]
}
]
After merging the two list I am getting the below output:
[
{
"userGroupCode" : "A100",
"userGroupDesc" : "Finance",
"userPreference": ["Mumbai","Bangalore"],
"Employee" : []
},
{
"userGroupCode" : "A100",
"userGroupDesc" : "Finance",
"userPreference": [],
"Employee" : [
"employee_id" : "101",
"name" : "Foo1",
"role" : []
]
}
]
Could anyone please help me with few things:
Thank you in advance.
Ola,
You can group by using Map taking id as key and value as object ( to be aggregated into) . For example:
if(map.containes(key))
{
get object from map and do Ops.
}
else
{
1. Create new object
2. Do set Ops on Object
3. Add to map.
}