1. Querying for Single Row
Here’s two ways to show you how to query or extract a single row from database, and convert it into a model class.
1.1 Custom RowMapper
In general, It’s always recommend to implement the RowMapper interface to create a custom RowMapper to suit your needs.
package com.mkyong.customer.model;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.springframework.jdbc.core.RowMapper;
public class CustomerRowMapper implements RowMapper
{
public Object mapRow(ResultSet rs, int rowNum) throws SQLException {
Customer customer = new Customer();
customer.setCustId(rs.getInt("CUST_ID"));
customer.setName(rs.getString("NAME"));
customer.setAge(rs.getInt("AGE"));
return customer;
}
}
public Customer findByCustomerId(int custId){
String sql = "SELECT * FROM CUSTOMER WHERE CUST_ID = ?";
Customer customer = getSimpleJdbcTemplate().queryForObject(
sql, new CustomerRowMapper(), custId);
return customer;
}
1.2 BeanPropertyRowMapper
In SimpleJdbcTemplate, you need to use ‘ParameterizedBeanPropertyRowMapper’ instead of ‘BeanPropertyRowMapper’.
public Customer findByCustomerId2(int custId){
String sql = "SELECT * FROM CUSTOMER WHERE CUST_ID = ?";
Customer customer = getSimpleJdbcTemplate().queryForObject(sql,
ParameterizedBeanPropertyRowMapper.newInstance(Customer.class), custId);
return customer;
}
2. Querying for Multiple Rows
Query or extract multiple rows from database, and convert it into a List.
2.1 ParameterizedBeanPropertyRowMapper
public List<Customer> findAll(){
String sql = "SELECT * FROM CUSTOMER";
List<Customer> customers =
getSimpleJdbcTemplate().query(sql,
ParameterizedBeanPropertyRowMapper.newInstance(Customer.class));
return customers;
}
3. Querying for a Single Value
Query or extract a single column value from database.
3.1 Single column name
It shows how to query a single column name as String.
public String findCustomerNameById(int custId){
String sql = "SELECT NAME FROM CUSTOMER WHERE CUST_ID = ?";
String name = getSimpleJdbcTemplate().queryForObject(
sql, String.class, custId);
return name;
}
3.2 Total number of rows
It shows how to query a total number of rows from database.
public int findTotalCustomer(){
String sql = "SELECT COUNT(*) FROM CUSTOMER";
int total = getSimpleJdbcTemplate().queryForInt(sql);
return total;
}
下面是运行例子.
package com.mkyong.common;
import java.util.ArrayList;
import java.util.List;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.mkyong.customer.dao.CustomerDAO;
import com.mkyong.customer.model.Customer;
public class SimpleJdbcTemplateApp
{
public static void main( String[] args )
{
ApplicationContext context =
new ClassPathXmlApplicationContext("Spring-Customer.xml");
CustomerDAO customerSimpleDAO =
(CustomerDAO) context.getBean("customerSimpleDAO");
Customer customerA = customerSimpleDAO.findByCustomerId(1);
System.out.println("Customer A : " + customerA);
Customer customerB = customerSimpleDAO.findByCustomerId2(1);
System.out.println("Customer B : " + customerB);
List<Customer> customerAs = customerSimpleDAO.findAll();
for(Customer cust: customerAs){
System.out.println("Customer As : " + customerAs);
}
List<Customer> customerBs = customerSimpleDAO.findAll2();
for(Customer cust: customerBs){
System.out.println("Customer Bs : " + customerBs);
}
String customerName = customerSimpleDAO.findCustomerNameById(1);
System.out.println("Customer Name : " + customerName);
int total = customerSimpleDAO.findTotalCustomer();
System.out.println("Total : " + total);
}
}
query object list
public List<CitiriskApp> getCitiriskApp(){
SimpleJdbcTemplate simpleJdbc = new SimpleJdbcTemplate(getJdbcTemplate().getDataSource());
String querySQL = "select * from citirisk_application";
return simpleJdbc.query(querySQL, new ParameterizedRowMapper<CitiriskApp>() {
@Override
public CitiriskApp mapRow(ResultSet rs, int i) throws SQLException {
CitiriskApp citiriskApp = new CitiriskApp();
citiriskApp.setAppId(rs.getInt("app_id"));
citiriskApp.setCsiId(rs.getInt("csi_id"));
citiriskApp.setShortName(StringUtils.cleanSpace(rs.getString("short_name")));
citiriskApp.setLongName(StringUtils.cleanSpace(rs.getString("long_name")));
citiriskApp.setSmtSOEID(StringUtils.cleanSpace(rs.getString("smt_soe_id")));
citiriskApp.setTechOwnerSOEID(StringUtils.cleanSpace(rs.getString("tech_owner_soe_id")));
citiriskApp.setCitiriskContactSOEID(StringUtils.cleanSpace(rs.getString("citirisk_contact_soe_id")));
citiriskApp.setRiskArchOwnerSOEID(StringUtils.cleanSpace(rs.getString("risk_arch_owner_soe_id")));
citiriskApp.setBizOwnerSOEID(StringUtils.cleanSpace(rs.getString("biz_owner_soe_id")));
return citiriskApp;
}
});
}
insert exmaple
public void insert(Customer customer){
String sql = "INSERT INTO CUSTOMER " +
"(CUST_ID, NAME, AGE) VALUES (?, ?, ?)";
jdbcTemplate = new JdbcTemplate(dataSource);
jdbcTemplate.update(sql, new Object[] { customer.getCustId(),
customer.getName(),customer.getAge()
});
}
Conclusion
The SimpleJdbcTemplate isn’t a replacement for JdbcTemplate, it’s just a java5-friendly supplement to it.
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NULL 博文链接:https://1194867672-qq-com.iteye.com/blog/1291025
我的使用Spring的SimpleJdbcTemplate完成DAO操作实例 博文链接:https://zmx.iteye.com/blog/373749
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