Spring JdbcTemplate batchUpdate() 實例

在某些情況下,可能需要將一批記錄插入到數據庫中。如果你對每條記錄調用一個插件的方法,SQL語句將被重複編譯,造成系統緩慢進行。

在上述情況下,你可以使用 JdbcTemplate BATCHUPDATE()方法來執行批量插入操作。用這種方法,該語句只被編譯一次,執行多次。

詳見 JdbcTemplate 類的 BATCHUPDATE()示例。

//insert batch example
public void insertBatch(final List 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();
}

});
}

或者,可以直接執行SQL。

//insert batch example with SQL
public void insertBatchSQL(final String sql){

getJdbcTemplate().batchUpdate(new String\[\]{sql});

}

Spring 的 bean 配置文件

<bean id="customerDAO" class="com.yiibai.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/yiibaijava" />
    <property name="username" value="root" />
    <property name="password" value="password" />
</bean>

執行它

package com.yiibai.common;

import java.util.ArrayList;
import java.util.List;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.yiibai.customer.dao.CustomerDAO;
import com.yiibai.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, "yiibai1",21);
    Customer customer3 = new Customer(2, "yiibai2",22);
    Customer customer2 = new Customer(3, "yiibai3",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);

}

}

在本例中,插入三條顧客的記錄,並批量更新所有客戶的名字。

下載代碼 –  http://pan.baidu.com/s/1jGTXfgi