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ENNAHDI EL IDRISSI, Mohamed — Tue, 28 Aug 2018 10:49:34 -0000

Assuming a general purpose tree (of type net.sf.treeds4j.node.Node<t></t>) has been been filled with data, it could be easily converted to a PrimeFaces tree as follows:

/*
 * generalPurposeTree could be loaded using the examples above (descendant or employees).
 */

DefaultTreeNode newPFTree = new DefaultTreeNode();

new PrimeFacesTree().convertToPrimeFacesTree(generalPurposeTree, newPFTree);

PrimeFacesTree.traverse(newPFTree);

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ENNAHDI EL IDRISSI, Mohamed — Thu, 16 Aug 2018 16:07:29 -0000

This is an SQLTree sample, showcasing the SQL version of Employee bean, and the invocation.

No need to implement the SQLTree, because SQL helps when it comes to primary keys and foreign keys.

Below the source code of the employee bean:

package net.sf.treeds4j.test.sql.employee;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import net.sf.treeds4j.tree.bean.SQLTreeBean;

public class EmployeeSQL extends SQLTreeBean<EmployeeSQL> {
    Integer id;
    String firstName;
    String lastName;
    Date birthDate;
    String gender;
    Date hireDate;
    Integer managerId;

    public EmployeeSQL() throws SQLException {
        super();
    }
    public EmployeeSQL(Connection connection) throws SQLException {
        super(connection);
    }

    public EmployeeSQL(ResultSet rs) throws SQLException {
        this.id = rs.getInt("emp_no");
        this.firstName = rs.getString("first_name");
        this.lastName = rs.getString("last_name");
        this.birthDate = rs.getDate("birth_date");
        this.hireDate = rs.getDate("hire_date");
        this.gender = rs.getString("gender");
        this.managerId = rs.getInt("manager_id");
    }

    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getFirstName() {
        return firstName;
    }
    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }
    public String getLastName() {
        return lastName;
    }
    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
    public Date getBirthDate() {
        return birthDate;
    }
    public void setBirthDate(Date birthDate) {
        this.birthDate = birthDate;
    }
    public String getGender() {
        return gender;
    }
    public void setGender(String gender) {
        this.gender = gender;
    }
    public Date getHireDate() {
        return hireDate;
    }
    public void setHireDate(Date hireDate) {
        this.hireDate = hireDate;
    }
    public Integer getManagerId() {
        return managerId;
    }
    public void setManagerId(Integer managerId) {
        this.managerId = managerId;
    }

    @Override
    public List<EmployeeSQL> getSubList() {
        List<EmployeeSQL> emps = new ArrayList<EmployeeSQL>();
        StringBuilder sql = new StringBuilder();
        sql.append("    SELECT  *   ");
        sql.append("    FROM    EMPLOYEES   ");
        sql.append("    WHERE   MANAGER_ID  ").append(" =   ").append(" ?   ");
        sql.append("    OR     (MANAGER_ID IS NULL AND ? IS NULL)   ");

        PreparedStatement ps = null;
        ResultSet rs = null;
        try {
            ps = getConnection().prepareStatement(sql.toString());
            if (this.id == null) {
                ps.setNull(1, java.sql.Types.INTEGER);
                ps.setNull(2, java.sql.Types.INTEGER);
            } else {
                ps.setInt(1, this.id);
                ps.setInt(2, this.id);
            }
            rs = ps.executeQuery();
            while (rs.next()) {
                 emps.add(new EmployeeSQL(rs));
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            if (rs != null) {
                try {
                    rs.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
            if (ps != null) {
                try {
                    ps.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }
        return emps;
    }

    @Override
    public String toString() {
        return this.id + " " + this.firstName + " " + this.lastName + " " + this.managerId;
    }
}

Below the source code of the SQL invocation (JUnit):

package net.sf.treeds4j.test.sql.employee;

import java.sql.Connection;
import java.sql.SQLException;

import net.sf.treeds4j.node.Node;
import net.sf.treeds4j.tree.SQLTree;
import net.sf.treeds4j.tree.Tree;

import org.junit.Test;

public class EmployeeSQLTest {
    @Test
    public void test() {
        Node<EmployeeSQL> d;
        Connection c = null;
        try {
            c = DBConnection.getInstance();
            d = new SQLTree<EmployeeSQL>().loadTree(new EmployeeSQL(c));
            Tree.traverse(d);
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            if (c != null) {
                try {
                    c.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

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ENNAHDI EL IDRISSI, Mohamed — Thu, 16 Aug 2018 15:50:48 -0000

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ENNAHDI EL IDRISSI, Mohamed — Thu, 16 Aug 2018 15:37:05 -0000

A sample case of treeDS4j's InMemoryTree, Descendants case:

The bean:

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ENNAHDI EL IDRISSI, Mohamed — Tue, 17 Jul 2018 18:48:18 -0000

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