DBUtils使用总结
本文出自 “熔 岩” 博客,请务必保留此出处http://lavasoft.blog.51cto.com/62575/270661 附件下载:dbutilstest.rar 本文转载:http://2008ningli.blog.163.com/blog/static/3699023200983102416916/ package cn.lining.test; import java.sql.Connection; import org.apache.commons.dbutils.DbUtils; public class test { UserField userField = new UserField(); Connection conn = null; // 以下部分代码采用MapHandler存储方式查询 System.out.println("id ------------- name "); // 以下部分代码采用MapListHandler存储方式查询 System.out.println("id ------------- name "); // 以下部分代码采用BeanHandler存储方式查询 // 以下部分代码采用BeanListHandler存储方式查询 // 以下部分代码采用ArrayHandler存储方式查询 System.out.println("id ------------- name "); // 以下部分代码采用ArrayListHandler存储方式查询 // 以下部分代码采用ColumnListHandler存储方式查询指定列 // 以下部分代码采用ScalarHandler存储方式查询 System.out.println("name "); // 以下部分代码采用KeyedHandler存储方式查询 System.out.println("name: field_name2"); // 以下部分代码插入一条数据 // 以下部分代码更新一条数据 // 以下部分代码删除一条数据 } catch (SQLException ex) { }
Map found = (Map) queryRunner.query("select id, name, age from person", h);
Map jane = (Map) found.get(newLong(1));// jane's id is 1
String janesName = (String) jane.get("name");
Integer janesAge = (Integer) jane.get("age");
int a1 = (Integer) null;
boolean x1 = (Boolean)null;
//正确
Integer a2 = (Integer) null;
Boolean x2 = (Boolean)null;
idbigint(20)NOTNULLAUTO_INCREMENT,
namevarchar(24)DEFAULTNULL,
ageint(11)DEFAULTNULL,
addressvarchar(120)DEFAULTNULL,
PRIMARYKEY(id)
) ENGINE=MyISAM AUTO_INCREMENT=1DEFAULTCHARSET=gbk
privateLong id;
privateString sdf;
privateString address2;
privateInteger age;
publicPerson() {
}
publicPerson(String sdf) {
this.sdf = sdf;
}
publicPerson(String sdf, Integer age, String address) {
this.sdf = sdf;
this.age = age;
this.address2 = address;
}
publicLong getId() {
returnid;
}
publicvoidsetId(Long id) {
this.id = id;
}
publicString getSdf() {
returnsdf;
}
publicvoidsetSdf(String sdf) {
this.sdf = sdf;
}
publicInteger getAge() {
returnage;
}
publicvoidsetAge(Integer age) {
this.age = age;
}
publicString getAddress() {
returnaddress2;
}
publicvoidsetAddress(String address2) {
this.address2 = address2;
}
}
importcom.lavasoft.common.DBToolkit;
importorg.apache.commons.dbutils.QueryRunner;
importorg.apache.commons.dbutils.handlers.BeanHandler;
importorg.apache.commons.dbutils.handlers.BeanListHandler;
importorg.apache.commons.dbutils.handlers.MapHandler;
importorg.apache.commons.dbutils.handlers.ScalarHandler;
importjava.sql.Connection;
importjava.sql.SQLException;
importjava.util.List;
importjava.util.Map;
/**
* Created by IntelliJ IDEA.
*
* @author leizhimin 2010-1-25 21:00:29
*/
publicclassPersonDAOImplimplementsPersonDAO {
privatestaticPersonDAOImpl instance =newPersonDAOImpl();
publicstaticPersonDAOImpl getInstance() {
returninstance;
}
publicstaticvoidmain(String[] args) {
//错误
inta1 = (Integer)null;
booleanx1 = (Boolean)null;
//正确
Integer a2 = (Integer)null;
Boolean x2 = (Boolean)null;
getInstance().save(null);
//getInstance().save(null);
//getInstance().save(null);
//getInstance().save(null);
//getInstance().save(null);
getInstance().update(null);
getInstance().load(null);
getInstance().load4Map(null);
}
@Override
publicLong save(String sql) {
Long id =null;
String ins_sql ="INSERT INTO person (NAME, age, address) VALUES ('aaa', 21, 'address001')";
Connection conn = DBToolkit.getConnection();
QueryRunner qr =newQueryRunner();
try{
qr.update(conn, ins_sql);
//获取新增记录的自增主键
id = (Long) qr.query(conn,"SELECT LAST_INSERT_ID()",newScalarHandler(1));
}catch(SQLException e) {
e.printStackTrace();
}finally{
DBToolkit.closeConnection(conn);
}
returnid;
}
@Override
publicintdelete(Long id) {
intx = 0;
Connection conn = DBToolkit.getConnection();
QueryRunner qr =newQueryRunner();
try{
x = qr.update(conn,"DELETE FROM person WHERE id = ?", id);
}catch(SQLException e) {
e.printStackTrace();
}finally{
DBToolkit.closeConnection(conn);
}
returnx;
}
@Override
publicintupdate(Person person) {
intx = 0;
Connection conn = DBToolkit.getConnection();
QueryRunner qr =newQueryRunner();
try{
x = qr.update(conn,"UPDATE person SET NAME = ?, age = ?, address = ? WHERE id = ?","xxx", 23,"ttt", 5);
}catch(SQLException e) {
e.printStackTrace();
}finally{
DBToolkit.closeConnection(conn);
}
returnx;
}
@Override
publicPerson load(Long id) {
Connection conn = DBToolkit.getConnection();
QueryRunner qr =newQueryRunner();
try{
Person person = (Person) qr.query(conn,"SELECT * FROM person where id = ?",newBeanHandler(Person.class), 3L);
System.out.println(person.getId() +"/t"+ person.getSdf() +"/t"+ person.getAge() +"/t"+ person.getAddress());
}catch(SQLException e) {
e.printStackTrace();
}
returnnull;
}
@Override
publicList<Person> findPerson(String sql) {
Connection conn = DBToolkit.getConnection();
QueryRunner qr =newQueryRunner();
try{
List<Person> pset = (List) qr.query(conn,"SELECT * FROM person",newBeanListHandler(Person.class));
for(Person person : pset) {
System.out.println(person.getId() +"/t"+ person.getSdf() +"/t"+ person.getAge() +"/t"+ person.getAddress());
}
}catch(SQLException e) {
e.printStackTrace();
}
returnnull;
}
publicPerson load4Map(Long id) {
Connection conn = DBToolkit.getConnection();
QueryRunner qr =newQueryRunner();
try{
//先将两个字段置为null
qr.update(conn,"update person set age =null,address =nullwhere id =1");
Map<String, Object> map = qr.query(conn,"SELECT * FROM person where id = ?",newMapHandler(), 1L);
Person person =newPerson();
person.setId((Long) map.get("id"));
person.setSdf((String) map.get("name"));
person.setAge((Integer) map.get("age"));
person.setAddress((String) map.get("address"));
System.out.println(person.getId() +"/t"+ person.getSdf() +"/t"+ person.getAge() +"/t"+ person.getAddress());
}catch(SQLException e) {
e.printStackTrace();
}
returnnull;
}
}
Dbutil 的使用示例
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.List;
import java.util.Map;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.ArrayHandler;
import org.apache.commons.dbutils.handlers.ArrayListHandler;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.apache.commons.dbutils.handlers.ColumnListHandler;
import org.apache.commons.dbutils.handlers.KeyedHandler;
import org.apache.commons.dbutils.handlers.MapHandler;
import org.apache.commons.dbutils.handlers.MapListHandler;
import org.apache.commons.dbutils.handlers.ScalarHandler;
@SuppressWarnings("unchecked")
public static void main(String[] args) throws ClassNotFoundException {
String jdbcURL = "jdbc:mysql://localhost:3306/macaw4";
String jdbcDriver = "com.mysql.jdbc.Driver";
try {
DbUtils.loadDriver(jdbcDriver);
conn = DriverManager.getConnection(jdbcURL, "root", "root");
conn.setAutoCommit(false);//关闭自动提交
QueryRunner qRunner = new QueryRunner();
System.out.println("***Using MapHandler***");
Map map = (Map) qRunner.query(conn,
"select * from mc_user_field where id = ?",
new MapHandler(), new Object[] { "5" });
System.out.println(map.get("id") + " ------------- "
+ map.get("name"));
System.out.println("***Using MapListHandler***");
List lMap = (List) qRunner.query(conn,
"select * from mc_user_field", new MapListHandler());
for (int i = 0; i < lMap.size(); i++) {
Map vals = (Map) lMap.get(i);
System.out.println(vals.get("id") + " ------------- "
+ vals.get("name"));
}
System.out.println("***Using BeanHandler***");
userField = (UserField) qRunner.query(conn,
"select * from mc_user_field where id = ?",
new BeanHandler(Class.forName("cn.lining.test.UserField")),
new Object[] { "5" });
System.out.println("id ------------- name ");
System.out.println(userField.getId() + " ------------- "
+ userField.getName());
System.out.println("***Using BeanListHandler***");
List lBean = (List) qRunner.query(conn,
"select * from mc_user_field", new BeanListHandler(Class
.forName("cn.lining.test.UserField")));
System.out.println("id ------------- name ");
for (int i = 0; i < lBean.size(); i++) {
userField = (UserField) lBean.get(i);
System.out.println(userField.getId() + " ------------- "
+ userField.getName());
}
System.out.println("***Using ArrayHandler***");
Object[] array = (Object[]) qRunner.query(conn,
"select * from mc_user_field where id = ?",
new ArrayHandler(), new Object[] { "5" });
System.out.println(array[0].toString() + " ------------- "
+ array[1].toString());
System.out.println("***Using ArrayListHandler***");
List lArray = (List) qRunner.query(conn,
"select * from mc_user_field", new ArrayListHandler());
System.out.println("id ------------- name ");
for (int i = 0; i < lArray.size(); i++) {
Object[] var = (Object[]) lArray.get(i);
System.out.println(var[0].toString() + " ------------- "
+ var[1].toString());
}
System.out.println("***Using ColumnListHandler***");
List lName = (List) qRunner.query(conn,
"select * from mc_user_field where id = ?",
new ColumnListHandler("name"), new Object[] { "5" });
System.out.println("name ");
for (int i = 0; i < lName.size(); i++) {
String name = (String) lName.get(i);
System.out.println(name);
}
System.out.println("***Using ScalarHandler***");
String name = (String) qRunner.query(conn,
"select * from mc_user_field where id = ?",
new ScalarHandler("name"), new Object[] { "5" });
System.out.println(name);
System.out.println("***Using KeyedHandler***");
Map<String, Map> map2 = (Map<String, Map>) qRunner.query(conn,
"select * from mc_user_field", new KeyedHandler("name"));
Map vals = (Map) map2.get("field_name2");
System.out.println(vals.get("id") + " " + vals.get("name") + " "
+ vals.get("type"));
System.out.println("***Insert begin***");
userField = new UserField();
qRunner.update(conn, "insert into mc_user_field ("
+ "id,name,type,sort_order,required,visible)"
+ "values (?,?,?,?,?,?)", new Object[] { userField.getId(),
userField.getName(), userField.getType(),
userField.getSort_order(), userField.getRequired(),
userField.getVisible() });
System.out.println("***update end***");
System.out.println("***update begin***");
userField = new UserField();
qRunner.update(conn, "update mc_user_field set "
+ "name = ?,type = ?,sort_order = ?,"
+ "required = ?,visible = ?" + "where id = ?",
new Object[] { userField.getName(), userField.getType(),
userField.getSort_order(), userField.getRequired(),
userField.getVisible(), userField.getId() });
System.out.println("***update end***");
System.out.println("***delete begin***");
userField = new UserField();
qRunner.update(conn, "delete from mc_user_field where id2 = ?",
new Object[] { userField.getId() });
System.out.println("***delete end***");
ex.printStackTrace();
try {
System.out.println("***rollback begin***");
DbUtils.rollback(conn);
System.out.println("***rollback end***");
} catch (SQLException e) {
e.printStackTrace();
}
} finally {
DbUtils.closeQuietly(conn);
}
}
/*
* ArrayHandler:把结果集中的第一行数据转成对象数组。
* ArrayListHandler:把结果集中的每一行数据都转成一个对象数组,再存放到List中。
* BeanHandler:将结果集中的第一行数据封装到一个对应的JavaBean实例中。
* BeanListHandler:将结果集中的每一行数据都封装到一个对应的JavaBean实例中,存放到List里。
* ColumnListHandler:将结果集中某一列的数据存放到List中。
* KeyedHandler:将结果集中的每一行数据都封装到一个Map里,然后再根据指定的key把每个Map再存放到一个Map里。
* MapHandler:将结果集中的第一行数据封装到一个Map里,key是列名,value就是对应的值。
* MapListHandler:将结果集中的每一行数据都封装到一个Map里,然后再存放到List。
* ScalarHandler:将结果集中某一条记录的其中某一列的数据存成Object。
*
*/
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