Moved database interaction into ORM class
Signed-off-by: Jim Martens <github@2martens.de>
This commit is contained in:
52
02/src/de/dis2017/data/EstateAgent.java
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52
02/src/de/dis2017/data/EstateAgent.java
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@ -0,0 +1,52 @@
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package de.dis2017.data;
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/**
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* EstateAgent data class
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*/
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public class EstateAgent {
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private int id = -1;
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private String name;
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private String address;
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private String login;
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private String password;
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public int getId() {
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return id;
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}
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public void setId(int id) {
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this.id = id;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public String getAddress() {
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return address;
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}
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public void setAddress(String address) {
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this.address = address;
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}
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public String getLogin() {
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return login;
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}
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public void setLogin(String login) {
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this.login = login;
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}
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public String getPassword() {
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return password;
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}
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public void setPassword(String password) {
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this.password = password;
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}
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}
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@ -1,153 +0,0 @@
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package de.dis2017.data;
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import java.sql.Connection;
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import java.sql.PreparedStatement;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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import java.sql.Statement;
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/**
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* Makler-Bean
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*
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* Beispiel-Tabelle:
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* CREATE TABLE makler(id INTEGER NOT NULL GENERATED ALWAYS AS IDENTITY (START WITH 1, INCREMENT BY 1, NO CACHE) PRIMARY KEY,
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* name varchar(255),
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* address varchar(255),
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* login varchar(40) UNIQUE,
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* password varchar(40));
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*/
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public class Makler {
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private int id = -1;
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private String name;
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private String address;
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private String login;
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private String password;
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public int getId() {
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return id;
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}
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public void setId(int id) {
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this.id = id;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public String getAddress() {
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return address;
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}
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public void setAddress(String address) {
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this.address = address;
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}
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public String getLogin() {
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return login;
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}
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public void setLogin(String login) {
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this.login = login;
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}
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public String getPassword() {
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return password;
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}
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public void setPassword(String password) {
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this.password = password;
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}
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/**
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* Lädt einen Makler aus der Datenbank
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* @param id ID des zu ladenden Maklers
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* @return Makler-Instanz
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*/
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public static Makler load(int id) {
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try {
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// Hole Verbindung
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Connection con = DB2ConnectionManager.getInstance().getConnection();
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// Erzeuge Anfrage
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String selectSQL = "SELECT * FROM makler WHERE id = ?";
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PreparedStatement pstmt = con.prepareStatement(selectSQL);
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pstmt.setInt(1, id);
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// Führe Anfrage aus
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ResultSet rs = pstmt.executeQuery();
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if (rs.next()) {
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Makler ts = new Makler();
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ts.setId(id);
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ts.setName(rs.getString("name"));
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ts.setAddress(rs.getString("address"));
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ts.setLogin(rs.getString("login"));
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ts.setPassword(rs.getString("password"));
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rs.close();
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pstmt.close();
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return ts;
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}
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} catch (SQLException e) {
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e.printStackTrace();
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}
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return null;
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}
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/**
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* Speichert den Makler in der Datenbank. Ist noch keine ID vergeben
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* worden, wird die generierte Id von DB2 geholt und dem Model übergeben.
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*/
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public void save() {
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// Hole Verbindung
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Connection con = DB2ConnectionManager.getInstance().getConnection();
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try {
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// FC<ge neues Element hinzu, wenn das Objekt noch keine ID hat.
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if (getId() == -1) {
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// Achtung, hier wird noch ein Parameter mitgegeben,
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// damit spC$ter generierte IDs zurC<ckgeliefert werden!
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String insertSQL = "INSERT INTO makler(name, address, login, password) VALUES (?, ?, ?, ?)";
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PreparedStatement pstmt = con.prepareStatement(insertSQL,
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Statement.RETURN_GENERATED_KEYS);
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// Setze Anfrageparameter und fC<hre Anfrage aus
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pstmt.setString(1, getName());
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pstmt.setString(2, getAddress());
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pstmt.setString(3, getLogin());
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pstmt.setString(4, getPassword());
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pstmt.executeUpdate();
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// Hole die Id des engefC<gten Datensatzes
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ResultSet rs = pstmt.getGeneratedKeys();
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if (rs.next()) {
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setId(rs.getInt(1));
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}
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rs.close();
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pstmt.close();
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} else {
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// Falls schon eine ID vorhanden ist, mache ein Update...
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String updateSQL = "UPDATE makler SET name = ?, address = ?, login = ?, password = ? WHERE id = ?";
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PreparedStatement pstmt = con.prepareStatement(updateSQL);
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// Setze Anfrage Parameter
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pstmt.setString(1, getName());
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pstmt.setString(2, getAddress());
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pstmt.setString(3, getLogin());
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pstmt.setString(4, getPassword());
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pstmt.setInt(5, getId());
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pstmt.executeUpdate();
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pstmt.close();
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}
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} catch (SQLException e) {
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e.printStackTrace();
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}
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}
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}
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109
02/src/de/dis2017/data/db/ORM.java
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109
02/src/de/dis2017/data/db/ORM.java
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@ -0,0 +1,109 @@
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package de.dis2017.data.db;
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import de.dis2017.data.EstateAgent;
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import java.sql.*;
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import java.util.HashMap;
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import java.util.Map;
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/**
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* Maps the data objects to the database and vice versa.
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*/
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public class ORM {
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private Connection _connection;
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private Map<Integer, EstateAgent> _agents;
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/**
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* Initializes the ORM.
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*/
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public ORM() {
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DB2ConnectionManager _dbManager = DB2ConnectionManager.getInstance();
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_connection = _dbManager.getConnection();
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_agents = new HashMap<>();
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}
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/**
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* Loads the estate agent with the given ID from database and returns the corresponding object.
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*
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* @param ID the ID of the agent to load
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* @return returns the EstateAgent or null if there is no such agent
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*/
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public EstateAgent getEstateAgent(int ID) {
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if (_agents.containsKey(ID)) {
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return _agents.get(ID);
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}
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try {
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// create query
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String selectSQL = "SELECT * FROM ESTATEAGENT WHERE ID = ?";
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PreparedStatement pstmt = _connection.prepareStatement(selectSQL);
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pstmt.setInt(1, ID);
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// execute query
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ResultSet rs = pstmt.executeQuery();
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EstateAgent agent;
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if (rs.next()) {
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agent = new EstateAgent();
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agent.setId(ID);
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agent.setName(rs.getString("name"));
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agent.setAddress(rs.getString("address"));
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agent.setLogin(rs.getString("login"));
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agent.setPassword(rs.getString("password"));
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rs.close();
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pstmt.close();
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_agents.put(ID, agent);
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return agent;
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}
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} catch (SQLException e) {
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e.printStackTrace();
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}
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return null;
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}
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/**
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* Persists the given agent.
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*
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* @param agent the agent that should be persisted
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*/
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public void persist(EstateAgent agent)
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{
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try {
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if (agent.getId() == -1) {
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String insertSQL = "INSERT INTO ESTATEAGENT (name, address, login, password) VALUES (?, ?, ?, ?)";
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PreparedStatement pstmt = _connection.prepareStatement(insertSQL, Statement.RETURN_GENERATED_KEYS);
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pstmt.setString(1, agent.getName());
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pstmt.setString(2, agent.getAddress());
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pstmt.setString(3, agent.getLogin());
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pstmt.setString(4, agent.getPassword());
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pstmt.executeUpdate();
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ResultSet rs = pstmt.getGeneratedKeys();
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if (rs.next()) {
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agent.setId(rs.getInt(1));
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}
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rs.close();
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pstmt.close();
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} else {
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// create query
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String updateSQL = "UPDATE ESTATEAGENT SET name = ?, address = ?, password = ? WHERE ID = ?";
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PreparedStatement pstmt = _connection.prepareStatement(updateSQL);
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pstmt.setString(1, agent.getName());
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pstmt.setString(2, agent.getAddress());
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pstmt.setString(3, agent.getPassword());
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pstmt.setInt(4, agent.getId());
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// execute query
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pstmt.executeUpdate();
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pstmt.close();
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}
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} catch (SQLException e) {
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e.printStackTrace();
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}
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}
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}
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