Mysql5很好的支持了事物处理功能。不过支持这个功能的只有两种表类型。
分别是BDB,InnoDB。
先建立一个表,名为Kiss,数据为id (int),name(varchar),pop(varchar)。
下面是源码:
import
java.sql.
*
;
public class TestCommit {
public static void main(String args[]){
Connection conn=null;
try{
Class.forName("com.mysql.jdbc.Driver");
String url="jdbc:mysql://localhost:3306/kiss";
conn=DriverManager.getConnection(url,"username","password");
boolean autoCommit=conn.getAutoCommit();
//关闭自动提交功能
conn.setAutoCommit(false);
Statement stmt=conn.createStatement();
stmt.executeUpdate("insert into sun values(15,'Hello','Beijing')");
stmt.executeUpdate("insert into sun values(16,'Hi','shanghai')");
ResultSet rs=stmt.executeQuery("select * from sun");
while(rs.next()){
System.out.print("DeptNo:"+rs.getInt(1));
System.out.print("\tDeptName:"+rs.getString(2));
System.out.println("\tLOC:"+rs.getString(3));
}
//提交事务
conn.commit();
//恢复原来的提交模式
conn.setAutoCommit(autoCommit);
stmt.close();
}catch(Exception e){
System.out.println("操作失败!!!任务撤销!!!");
try{
//回滚、取消前述操作
conn.rollback();
}catch(Exception e1){
e1.printStackTrace();
}
}finally{
try{
if(conn!=null){
conn.close();
}
}catch(Exception e1){
e1.printStackTrace();
}
}
}
}
public class TestCommit {
public static void main(String args[]){
Connection conn=null;
try{
Class.forName("com.mysql.jdbc.Driver");
String url="jdbc:mysql://localhost:3306/kiss";
conn=DriverManager.getConnection(url,"username","password");
boolean autoCommit=conn.getAutoCommit();
//关闭自动提交功能
conn.setAutoCommit(false);
Statement stmt=conn.createStatement();
stmt.executeUpdate("insert into sun values(15,'Hello','Beijing')");
stmt.executeUpdate("insert into sun values(16,'Hi','shanghai')");
ResultSet rs=stmt.executeQuery("select * from sun");
while(rs.next()){
System.out.print("DeptNo:"+rs.getInt(1));
System.out.print("\tDeptName:"+rs.getString(2));
System.out.println("\tLOC:"+rs.getString(3));
}
//提交事务
conn.commit();
//恢复原来的提交模式
conn.setAutoCommit(autoCommit);
stmt.close();
}catch(Exception e){
System.out.println("操作失败!!!任务撤销!!!");
try{
//回滚、取消前述操作
conn.rollback();
}catch(Exception e1){
e1.printStackTrace();
}
}finally{
try{
if(conn!=null){
conn.close();
}
}catch(Exception e1){
e1.printStackTrace();
}
}
}
}
执行第一次执行这个类,id如果不冲突,就可以顺利插入数据,第二次插入,id冲突,则实现回滚。
下面是部分回滚:
import
java.sql.
*
;
public class TestSavepoint {
public static void main(String args[]){
Connection conn=null;
try{
Class.forName("com.mysql.jdbc.Driver");
String url="jdbc:mysql://localhost:3306/kiss";
conn=DriverManager.getConnection(url,"username","password");
boolean autoCommit=conn.getAutoCommit();
//关闭自动提交功能
conn.setAutoCommit(false);
Statement stmt=conn.createStatement();
stmt.executeUpdate("insert into sun values(21,'Hello','Beijing')");
stmt.executeUpdate("insert into sun values(22,'Hi','shanghai')");
Savepoint sp1=conn.setSavepoint("p1");
stmt.executeUpdate("insert into sun values(25,'shiyang','xingtai')");
Savepoint sp2=conn.setSavepoint("p2");
stmt.executeUpdate("insert into sun values(60,'shiyang','baoding')");
ResultSet rs=stmt.executeQuery("select avg(id) from sun");
rs.next();
double avg_id=rs.getDouble(1);
if(avg_id>100){
conn.rollback(sp1);
}else if(avg_id>30){
conn.rollback(sp2);
}
conn.commit();
rs=stmt.executeQuery("select * from sun");
while(rs.next()){
System.out.print(rs.getInt(1));
System.out.print("\t"+rs.getString(2).trim());
System.out.println("\t"+rs.getString(3));
}
rs.close();
stmt.close();
}catch(Exception e){
System.out.println("Failure.rollback!!!");
try{
conn.rollback();
}catch(Exception e1){
e1.printStackTrace();
}
e.printStackTrace();
}finally{
try{
if(conn!=null){
conn.close();
}
}catch(Exception e1){
e1.printStackTrace();
}
}
}
}
public class TestSavepoint {
public static void main(String args[]){
Connection conn=null;
try{
Class.forName("com.mysql.jdbc.Driver");
String url="jdbc:mysql://localhost:3306/kiss";
conn=DriverManager.getConnection(url,"username","password");
boolean autoCommit=conn.getAutoCommit();
//关闭自动提交功能
conn.setAutoCommit(false);
Statement stmt=conn.createStatement();
stmt.executeUpdate("insert into sun values(21,'Hello','Beijing')");
stmt.executeUpdate("insert into sun values(22,'Hi','shanghai')");
Savepoint sp1=conn.setSavepoint("p1");
stmt.executeUpdate("insert into sun values(25,'shiyang','xingtai')");
Savepoint sp2=conn.setSavepoint("p2");
stmt.executeUpdate("insert into sun values(60,'shiyang','baoding')");
ResultSet rs=stmt.executeQuery("select avg(id) from sun");
rs.next();
double avg_id=rs.getDouble(1);
if(avg_id>100){
conn.rollback(sp1);
}else if(avg_id>30){
conn.rollback(sp2);
}
conn.commit();
rs=stmt.executeQuery("select * from sun");
while(rs.next()){
System.out.print(rs.getInt(1));
System.out.print("\t"+rs.getString(2).trim());
System.out.println("\t"+rs.getString(3));
}
rs.close();
stmt.close();
}catch(Exception e){
System.out.println("Failure.rollback!!!");
try{
conn.rollback();
}catch(Exception e1){
e1.printStackTrace();
}
e.printStackTrace();
}finally{
try{
if(conn!=null){
conn.close();
}
}catch(Exception e1){
e1.printStackTrace();
}
}
}
}
代码测试通过,完美运行。
本文转自施杨博客园博客,原文链接:http://www.cnblogs.com/shiyangxt/archive/2008/08/16/1269065.html,如需转载请自行联系原作者