08-12 01:49 阅读 68

Spring JdbcTemplate batchUpdate() example

Spring JdbcTemplate batchUpdate() exampl

In some cases, you may required to insert a batch of records into database in one shot. If you call a single insert method for every record, the SQL statement will be compiled repeatedly and causing your system slow to perform.

In above case, you can use JdbcTemplate batchUpdate() method to perform the batch insert operations. With this method, the statement is compiled only once and executed multiple times.

See batchUpdate() example in JdbcTemplate class.

//insert batch examplepublic void insertBatch(final List<Customer> customers){   String sql = "INSERT INTO CUSTOMER " +
	"(CUST_ID, NAME, AGE) VALUES (?, ?, ?)"; 
  getJdbcTemplate().batchUpdate(sql, new BatchPreparedStatementSetter() { 
	@Override	public void setValues(PreparedStatement ps, int i) throws SQLException {
		Customer customer = customers.get(i);
		ps.setLong(1, customer.getCustId());
		ps.setString(2, customer.getName());
		ps.setInt(3, customer.getAge() );
	} 
	@Override	public int getBatchSize() {
		return customers.size();
	}
  });}

Alternatively, you can execute the SQL directly.

//insert batch example with SQLpublic void insertBatchSQL(final String sql){ 
	getJdbcTemplate().batchUpdate(new String[]{sql}); }

Spring’s bean configuration file

<beans xmlns="http://www.springframework.org/schema/beans"	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"	xsi:schemaLocation="http://www.springframework.org/schema/beans	http://www.springframework.org/schema/beans/spring-beans-2.5.xsd"> 	<bean id="customerDAO" class="com.mkyong.customer.dao.impl.JdbcCustomerDAO">
		<property name="dataSource" ref="dataSource" />
	</bean> 	<bean id="dataSource"         class="org.springframework.jdbc.datasource.DriverManagerDataSource"> 		<property name="driverClassName" value="com.mysql.jdbc.Driver" />
		<property name="url" value="jdbc:mysql://localhost:3306/mkyongjava" />
		<property name="username" value="root" />
		<property name="password" value="password" />
	</bean> </beans>

Run it

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 App{
    public static void main( String[] args )
    {
    	ApplicationContext context =
    		new ClassPathXmlApplicationContext("Spring-Customer.xml"); 
        CustomerDAO customerDAO = (CustomerDAO) context.getBean("customerDAO");
        Customer customer1 = new Customer(1, "mkyong1",21);
        Customer customer3 = new Customer(2, "mkyong2",22);
        Customer customer2 = new Customer(3, "mkyong3",23); 
        List<Customer>customers = new ArrayList<Customer>();
        customers.add(customer1);
        customers.add(customer2);
        customers.add(customer3); 
        customerDAO.insertBatch(customers);         String sql = "UPDATE CUSTOMER SET NAME ='BATCHUPDATE'";
        customerDAO.insertBatchSQL(sql);     }}

In this example, you are inserted three customers’ records and update all customer’s name in batch.