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本文实现旧库中的数据搬到新库中
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1、获取jdbc连接
package com.transferdata;
import java.sql.DriverManager;
import java.sql.SQLException;
import com.MySQL.jdbc.Connection;
public class ConnectionUtils {
public Connection getOldConn() {
String driver = "com.mysql.jdbc.Driver";
String url = "jdbc:mysql://localhost:3306/old?useUnicode=true&characterEncoding=utf-8";
String username = "root";
String password = "123456";
Connection conn = null;
try {
Class.forName(driver); //classLoader,加载对应驱动
conn = (Connection) DriverManager.getConnection(url, username, password);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
return conn;
}
public Connection getNewConn() {
String driver = "com.mysql.jdbc.Driver";
String url = "jdbc:mysql://localhost:3306/new?useUnicode=true&characterEncoding=utf-8";
String username = "root";
String password = "123456";
Connection conn = null;
try {
Class.forName(driver); //classLoader,加载对应驱动
conn = (Connection) DriverManager.getConnection(url, username, password);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
return conn;
}
public void closeConnection(Connection conn){
// 判断conn是否为空
if(conn != null){
try {
conn.close(); // 关闭数据库连接
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}2、获取老的数据
package com.transferdata;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import com.mysql.jdbc.Connection;
import com.mysql.jdbc.PreparedStatement;
import com.entity.Customer;
public class GetOldData {
private Connection oldConn;
public GetOldData(Connection oldConn){
this.oldConn = oldConn;
}
public List getCustomerList() {
List customerList = new ArrayList();
String sql = "select * from customer";
PreparedStatement pstmt;
try {
pstmt = (PreparedStatement)oldConn.prepareStatement(sql);
ResultSet rs = pstmt.executeQuery();
while (rs.next()) {
Customer customer = new Customer();
customer.setId(rs.getString("id"));
customer.setEmail(rs.getString("email"));
customer.setIdcardNo(rs.getString("idcard_no"));
customer.setLoginName(rs.getString("login_name"));
customer.setMobileNo(rs.getString("mobile_no"));
customer.setPassword(rs.getString("password"));
customer.setRealName(rs.getString("real_name"));
customer.setRecomerMoNo(rs.getString("recomer_mo_no"));
customerList.add(customer);
}
} catch (SQLException e) {
e.printStackTrace();
}
return customerList;
}
} 3、实体类
package com.entity;
public class Customer {
private String id;
private String loginName;
private String mobileNo;
private String recomerMoNo;
private String realName;
private String email;
private String idcardNo;
private String password;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getLoginName() {
return loginName;
}
public void setLoginName(String loginName) {
this.loginName = loginName;
}
public String getMobileNo() {
return mobileNo;
}
public void setMobileNo(String mobileNo) {
this.mobileNo = mobileNo;
}
public String getRecomerMoNo() {
return recomerMoNo;
}
public void setRecomerMoNo(String recomerMoNo) {
this.recomerMoNo = recomerMoNo;
}
public String getRealName() {
return realName;
}
public void setRealName(String realName) {
this.realName = realName;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getIdcardNo() {
return idcardNo;
}
public void setIdcardNo(String idcardNo) {
this.idcardNo = idcardNo;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}4、插入新库
用throws Exception，而不用try/catch，目的是将异常全部抛到外层
如果用try/catch ，外层将不能捕获异常，不会执行回滚操作，这点注意
package com.transferdata;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Date;
import java.util.List;
import com.mysql.jdbc.Connection;
import com.mysql.jdbc.PreparedStatement;
import com.entity.Customer;
public class InsertNewSchame {
private Connection newConn;
public InsertNewSchame(Connection newConn){
this.newConn = newConn;
}
/*
* 用throws Exception，而不用try/catch，目的是将异常全部抛到外层
*/
public boolean insertCustomer(Customer customer, String id) throws Exception{
// account_id\mobile_app_info\zhima_score\device_token
String sqlInsert = "INSERT INTO adm_sys_customer(email,idcard_no,login_name,mobile_no,password,real_name) "
+ "VALUES (?,?,?,?,?,?)";
PreparedStatement pstmt;
pstmt = (PreparedStatement) newConn.prepareStatement(sqlInsert);
pstmt.setString(1, customer.getEmail());
pstmt.setString(2, customer.getIdcardNo());
pstmt.setString(3, customer.getLoginName());
pstmt.setString(4, customer.getMobileNo());
pstmt.setString(5, customer.getPassword());
pstmt.setString(6, customer.getRealName());
pstmt.executeUpdate();
pstmt.close();
return true;
}
}5、测试
外层捕获异常后执行回滚操作
package com.zkbc.transferdata;
import java.sql.SQLException;
import java.util.List;
import com.mysql.jdbc.Connection;
import com..entity.Customer;
public class Testtest {
/*
* 外层捕获异常后执行回滚操作
*/
public static void main(String args[]) {
ConnectionUtils ConnectionUtils = new ConnectionUtils();
Connection oldConn = ConnectionUtils.getOldConn();
Connection newConn = ConnectionUtils.getNewConn();
GetOldData oldData = new GetOldData(oldConn);
InsertNewSchame newData = new InsertNewSchame(newConn);
try{
oldConn.setAutoCommit(false);
newConn.setAutoCommit(false);
String cuId = "0";
List customerList = oldData.getCustomerList();
for(Customer customer:customerList) {
cuId = (Integer.parseInt(cuId) + 1) + "";
//customer表和credit表
newData.insertCustomer(customer, cuId);
}
oldConn.commit();
newConn.commit();
}catch(Exception e) {
e.printStackTrace();
try {
oldConn.rollback();
newConn.rollback();
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}finally {
try {
oldConn.setAutoCommit(true);
newConn.setAutoCommit(true);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
ConnectionUtils.closeConnection(oldConn);
ConnectionUtils.closeConnection(newConn);
}
}
}