From 4afcff940551079617e8f4116e52bb0ef9df7fcc Mon Sep 17 00:00:00 2001
From: Kamal Wickramanayake <kamal@inbox.lk>
Date: Sat, 25 Apr 2026 21:53:33 +0530
Subject: Added Spring Framework sample code

---
 .../src/main/java/com/example/fp/dao/UserDAO.java  | 14 ++++
 .../java/com/example/fp/dao/jdbc/JDBCUserDAO.java  | 94 ++++++++++++++++++++++
 2 files changed, 108 insertions(+)
 create mode 100644 spring-framework/07-user-jdbc-ds-transaction/src/main/java/com/example/fp/dao/UserDAO.java
 create mode 100644 spring-framework/07-user-jdbc-ds-transaction/src/main/java/com/example/fp/dao/jdbc/JDBCUserDAO.java

(limited to 'spring-framework/07-user-jdbc-ds-transaction/src/main/java/com/example/fp/dao')

diff --git a/spring-framework/07-user-jdbc-ds-transaction/src/main/java/com/example/fp/dao/UserDAO.java b/spring-framework/07-user-jdbc-ds-transaction/src/main/java/com/example/fp/dao/UserDAO.java
new file mode 100644
index 0000000..b0215b1
--- /dev/null
+++ b/spring-framework/07-user-jdbc-ds-transaction/src/main/java/com/example/fp/dao/UserDAO.java
@@ -0,0 +1,14 @@
+package com.example.fp.dao;
+
+import java.util.List;
+
+import com.example.fp.User;
+
+public interface UserDAO {
+	public void create(User user);
+	public User find(int uid);
+	public User find(String username);
+	public void delete(int uid);
+	public List<User> findAll();
+	public void update(User user);
+}
diff --git a/spring-framework/07-user-jdbc-ds-transaction/src/main/java/com/example/fp/dao/jdbc/JDBCUserDAO.java b/spring-framework/07-user-jdbc-ds-transaction/src/main/java/com/example/fp/dao/jdbc/JDBCUserDAO.java
new file mode 100644
index 0000000..80d77af
--- /dev/null
+++ b/spring-framework/07-user-jdbc-ds-transaction/src/main/java/com/example/fp/dao/jdbc/JDBCUserDAO.java
@@ -0,0 +1,94 @@
+package com.example.fp.dao.jdbc;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.List;
+
+import javax.sql.DataSource;
+
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.jdbc.core.PreparedStatementCreator;
+import org.springframework.jdbc.core.RowMapper;
+import org.springframework.jdbc.support.GeneratedKeyHolder;
+import org.springframework.jdbc.support.KeyHolder;
+
+import com.example.fp.User;
+import com.example.fp.dao.UserDAO;
+
+public class JDBCUserDAO implements UserDAO {
+
+	private JdbcTemplate jdbcTemplate;
+
+    public void setDataSource(DataSource dataSource) {
+        this.jdbcTemplate = new JdbcTemplate(dataSource);
+    }
+
+	
+	@Override
+	public void create(User user) {
+		
+		final String INSERT_SQL = "insert into user_account (username, full_name, password, active) values(?, ?, ?, ?)";
+
+		KeyHolder keyHolder = new GeneratedKeyHolder();
+		jdbcTemplate.update(
+		    new PreparedStatementCreator() {
+		        public PreparedStatement createPreparedStatement(Connection connection) throws SQLException {
+		            PreparedStatement ps =
+		                connection.prepareStatement(INSERT_SQL, new String[] {"uid"});
+		            ps.setString(1, user.getUsername());
+		            ps.setString(2, user.getFullName());
+		            ps.setString(3, user.getPassword());
+		            ps.setInt(4, user.isActive() ? 1 : 0);
+		            return ps;
+		        }
+		    }, keyHolder);
+
+		// keyHolder.getKey() now contains the generated key
+		user.setUid(keyHolder.getKey().intValue());
+	}
+
+	@Override
+	public void delete(int uid) {
+		jdbcTemplate.update("delete from user_account where uid = ?", Integer.valueOf(uid));
+	}
+
+	@Override
+	public List<User> findAll() {
+		return this.jdbcTemplate.query( "select * from user_account", new UserMapper());
+	}
+
+	
+	@Override
+	public User find(int uid) {
+		return this.jdbcTemplate.queryForObject( "select * from user_account where uid = ?", new Object[] {Integer.valueOf(uid)}, new UserMapper());
+	}
+
+
+	@Override
+	public User find(String username) {
+		return this.jdbcTemplate.queryForObject( "select * from user_account where username = ?", new Object[] {username}, new UserMapper());
+	}
+
+
+	@Override
+	public void update(User user) {
+		this.jdbcTemplate.update("update user_account set username = ?, full_name = ?, password = ?, active = ? where uid = ?",
+				user.getUsername(), user.getFullName(), user.getPassword(), user.isActive() ? 1 : 0, user.getUid());
+	}
+
+	
+	private static final class UserMapper implements RowMapper<User> {
+
+	    public User mapRow(ResultSet rs, int rowNum) throws SQLException {
+	        User user = new User();
+	        user.setUid(rs.getInt("uid"));
+	        user.setUsername(rs.getString("username"));
+	        user.setFullName(rs.getString("full_name"));
+	        user.setPassword(rs.getString("password"));
+	        user.setActive(rs.getBoolean("active"));
+	        return user;
+	    }        
+	}
+}
\ No newline at end of file
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