Java/Spring/Spring DAO

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Spring DAO Pattern

   <source lang="java">
      

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.rumons.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 {

 public static void 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;
 private static class 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
 protected void 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;
 }
 public void setId(Long 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 getLastLogin() {
     return lastLogin;
 }
 public void setLastLogin(Date lastLogin) {
     this.lastLogin = lastLogin;
 }
 public String getComments() {
     return comments;
 }
 public void setComments(String comments) {
     this.ruments = 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();
 }

}


      </source>