Spring DAO Pattern
File: context.xml <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:util="http://www.springframework.org/schema/util" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:lang="http://www.springframework.org/schema/lang" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-2.0.xsd"> <bean id="dataSource"class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName" value="org.hsqldb.jdbcDriver"/> <property name="url" value="jdbc:hsqldb:mem:."/> <property name="username" value="sa"/> <property name="password" value=""/> </bean> <bean id="abstractJdbcDao"abstract="true"class="org.springframework.jdbc.core.support.JdbcDaoSupport"> <property name="dataSource" ref="dataSource"/> </bean> <bean id="customerDao"class="JdbcCustomerDao" parent="abstractJdbcDao"/> </beans> File: Main.java import java.sql.Types; import java.util.Date; import java.util.List; import java.util.Map; import javax.sql.DataSource; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import org.springframework.jdbc.core.RowMapper; import org.springframework.jdbc.core.SqlParameter; import org.springframework.jdbc.core.simple.ParameterizedBeanPropertyRowMapper; import org.springframework.jdbc.core.support.JdbcDaoSupport; import org.springframework.jdbc.object.SqlQuery; class Main { publicstaticvoid main(String args[]) throws Exception { ApplicationContext ac = new ClassPathXmlApplicationContext("context.xml", Main.class); DataSource dataSource = (DataSource) ac.getBean("dataSource"); // DataSource mysqlDataSource = (DataSource) ac.getBean("mysqlDataSource"); CustomerDao customerDao = (CustomerDao)ac.getBean("customerDao"); customerDao.getAll(); customerDao.getById(1L); } } class JdbcCustomerDao extends JdbcDaoSupport implements CustomerDao { private SelectCustomerById selectCustomerById; privatestaticclass SelectCustomerById extends SqlQuery { SelectCustomerById(DataSource ds) { super(ds, "select * from t_customer where id=?"); declareParameter(new SqlParameter(Types.INTEGER)); } protected RowMapper newRowMapper(Object[] parameters, Map context) { return ParameterizedBeanPropertyRowMapper.newInstance(Customer.class); } } @Override protectedvoid initDao() throws Exception { this.selectCustomerById = new SelectCustomerById(getDataSource()); } @SuppressWarnings({"unchecked"}) public List<Customer> getAll() { return getJdbcTemplate().query("select * from t_customer", ParameterizedBeanPropertyRowMapper.newInstance(Customer.class)); } public Customer getById(long id) { return (Customer)this.selectCustomerById.findObject(id); } } interface CustomerDao { List<Customer> getAll(); Customer getById(long id); } class Customer { private Long id; private String firstName; private String lastName; private Date lastLogin; private String comments; public Long getId() { return id; } publicvoid setId(Long id) { this.id = id; } public String getFirstName() { return firstName; } publicvoid setFirstName(String firstName) { this.firstName = firstName; } public String getLastName() { return lastName; } publicvoid setLastName(String lastName) { this.lastName = lastName; } public Date getLastLogin() { return lastLogin; } publicvoid setLastLogin(Date lastLogin) { this.lastLogin = lastLogin; } public String getComments() { return comments; } publicvoid setComments(String comments) { this.comments = comments; } @Override public String toString() { final StringBuilder sb = new StringBuilder(); sb.append("Customer"); sb.append("{id=").append(id); sb.append(", firstName='").append(firstName).append('\''); sb.append(", lastName='").append(lastName).append('\''); sb.append(", lastLogin=").append(lastLogin); sb.append(", comments='").append(comments).append('\''); sb.append('}'); return sb.toString(); } } 
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