- /**
- * 更新数据库已有的customer信息
- * @param List<CustomerBean>
- * @return
- */
- public int updateExistsInfo(List<CustomerBean> updateList){
- //查询的SQL语句
- String sql = "update t_customer set LICENSE_KEY=?,CORPORATE_NAME=?,INTEGRATED_CLASSIFICATION=?,BOSSHEAD=?," +
- "CONTACT_PHONE=?,ORDER_FREQUENCY=?,CONTACT_ADDRESS=?,USER_ID=? where CUSTOMER_ID=?" ;
- //插入需要的数据库对象
- Connection conn = null;
- PreparedStatement pstmt = null;
- try {
- conn = new DBSource().getConnection();
- //设置事务属性
- conn.setAutoCommit(false);
- pstmt = conn.prepareStatement(sql,ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
- for(CustomerBean cbean : updateList){
- pstmt.setString(1, cbean.getLicense_key());
- pstmt.setString(2, cbean.getCorporate_name());
- pstmt.setString(3, cbean.getIntegrated_classification());
- pstmt.setString(4, cbean.getBosshead());
- pstmt.setString(5, cbean.getContact_phone());
- pstmt.setString(6, cbean.getOrder_frequency());
- pstmt.setString(7, cbean.getContact_address());
- pstmt.setInt (8, cbean.getUser_id());
- pstmt.setInt (9, cbean.getCustomer_id());
- pstmt.addBatch();
- }
- int[] tt = pstmt.executeBatch();
- System.out.println("update : " + tt.length);
- //提交,设置事务初始值
- conn.commit();
- conn.setAutoCommit(true);
- //插入成功,返回
- return tt.length;
- }catch(SQLException ex){
- try{
- //提交失败,执行回滚操作
- conn.rollback();
- }catch (SQLException e) {
- e.printStackTrace();
- System.err.println("updateExistsInfo回滚执行失败!!!");
- }
- ex.printStackTrace();
- System.err.println("updateExistsInfo执行失败");
- //插入失败返回标志0
- return 0;
- }finally {
- try{
- //关闭资源
- if(pstmt != null)pstmt.close();
- if(conn != null)conn.close();
- }catch (SQLException e) {
- e.printStackTrace();
- System.err.println("资源关闭失败!!!");
- }
- }
- }
- /**
- * 插入数据中没有的customer信息
- * @param List<CustomerBean>
- * @return
- */
- public int insertNewInfo(List<CustomerBean> insertList){
- //查询的SQL语句
- String sql = "insert into t_customer(CUSTOMER_ID," +
- "LICENSE_KEY,CORPORATE_NAME,INTEGRATED_CLASSIFICATION,BOSSHEAD,CONTACT_PHONE," +
- "ORDER_FREQUENCY,CONTACT_ADDRESS,USER_ID,CUSTOMER_NUM,CUSTOMER_CODING," +
- "INVESTIGATION_TIME,SMS_REC_FLAG,WAP_FLAG,PRICE_GATHERING_FLAG,SOCIETY_STOCK_FLAG," +
- "REGION_TYPE)" +
- "VALUES(CUSTOMER.NEXTVAL," +
- "?,?,?,?,?," +
- "?,?,?,?,?," +
- "TO_DATE(?,'YYYY-MM-DD'),?,0,0,0," +
- "?)" ;
- //插入需要的数据库对象
- Connection conn = null;
- PreparedStatement pstmt = null;
- try {
- conn = new DBSource().getConnection();
- //设置事务属性
- conn.setAutoCommit(false);
- pstmt = conn.prepareStatement(sql,ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
- for(CustomerBean cbean : insertList){
- pstmt.setString(1, cbean.getLicense_key());
- pstmt.setString(2, cbean.getCorporate_name());
- pstmt.setString(3, cbean.getIntegrated_classification());
- pstmt.setString(4, cbean.getBosshead());
- pstmt.setString(5, cbean.getContact_phone());
- pstmt.setString(6, cbean.getOrder_frequency());
- pstmt.setString(7, cbean.getContact_address());
- pstmt.setInt(8, cbean.getUser_id());
- pstmt.setString(9, "gyyc00000");//
- pstmt.setString(10, "95000000");//
- pstmt.setString(11, getToday());
- pstmt.setInt(12, cbean.getSms_rec_flag());
- pstmt.setInt(13, cbean.getRegion_type());
- pstmt.addBatch();
- }
- int[] tt = pstmt.executeBatch();
- System.out.println("insert : " + tt.length);
- //提交,设置事务初始值
- conn.commit();
- conn.setAutoCommit(true);
- //插入成功,返回
- return tt.length;
- }catch(SQLException ex){
- try{
- //提交失败,执行回滚操作
- conn.rollback();
- }catch (SQLException e) {
- e.printStackTrace();
- System.err.println("insertNewInfo回滚执行失败!!!");
- }
- ex.printStackTrace();
- System.err.println("insertNewInfo执行失败");
- //插入失败返回标志0
- return 0;
- }finally {
- try{
- //关闭资源
- if(pstmt != null)pstmt.close();
- if(conn != null)conn.close();
- }catch (SQLException e) {
- e.printStackTrace();
- System.err.println("资源关闭失败!!!");
- }
- }
- }
使用Java JDBC基本的API批量插入数据到数据库中
- import java.sql.Connection;
- import java.sql.Statement;
- //...
- Connection connection = new getConnection();
- Statement statemenet = connection.createStatement();
- for (Employee employee: employees) {
- String query = "insert into employee (name, city) values('"
- + employee.getName() + "','" + employee.getCity + "')";
- statemenet.addBatch(query);
- }
- statemenet.executeBatch();
- statemenet.close();
- connection.close();
-
请注意我们是如何从Employee对象中的数据动态创建查询并在批处理中添加,插入一气呵成。完美!是不是?
等等......你必须思考什么关于SQL注入?这样动态创建的查询SQL注入是很容易的。并且每个插入查询每次都被编译。
为什么不使用PreparedStatement而不是简单的声明。是的,这是个解决方案。下面是SQL注入安全批处理。
SQL Injection Safe Batch - SQL注入安全批处理
思考一下下面代码:- import java.sql.Connection;
- import java.sql.PreparedStatement;
- //...
- String sql = "insert into employee (name, city, phone) values (?, ?, ?)";
- Connection connection = new getConnection();
- PreparedStatement ps = connection.prepareStatement(sql);
- for (Employee employee: employees) {
- ps.setString(1, employee.getName());
- ps.setString(2, employee.getCity());
- ps.setString(3, employee.getPhone());
- ps.addBatch();
- }
- ps.executeBatch();
- ps.close();
- connection.close();
这一解决方案仍然存在一个问题。考虑这样一个场景,在您想要插入到数据库使用批处理上万条记录。嗯,可能产生的OutOfMemoryError:
java.lang.OutOfMemoryError: Java heap space
com.mysql.jdbc.ServerPreparedStatement$BatchedBindValues.<init>(ServerPreparedStatement.java:72)
com.mysql.jdbc.ServerPreparedStatement.addBatch(ServerPreparedStatement.java:330)
org.apache.commons.dbcp.DelegatingPreparedStatement.addBatch(DelegatingPreparedStatement.java:171)
这是因为你试图在一个批次添加所有语句,并一次插入。最好的办法是将执行分批次。看看下面的解决方案
Smart Insert: Batch within Batch - 智能插入:将整批分批
这是一个简单的解决方案。考虑批量大小为1000,每1000个查询语句为一批插入提交。
- String sql = "insert into employee (name, city, phone) values (?, ?, ?)";
- Connection connection = new getConnection();
- PreparedStatement ps = connection.prepareStatement(sql);
- final int batchSize = 1000;
- int count = 0;
- for (Employee employee: employees) {
- ps.setString(1, employee.getName());
- ps.setString(2, employee.getCity());
- ps.setString(3, employee.getPhone());
- ps.addBatch();
- if(++count % batchSize == 0) {
- ps.executeBatch();
- }
- }
- ps.executeBatch(); // insert remaining records
- ps.close();
- connection.close();