Apache DBUtils使用总结 【转】
Apache DBUtils使用总结
DBUtils是个小巧的JDBC轻量级封装的工具包，其最核心的特性是结果集的封装，可以直接将查询出来的结果集封装成JavaBean，这就为我们做了最枯燥乏味、最容易出错的一大部分工作。
在使用DBUtils之前，应该注意一些问题：
1、DBUtils是JDBC的简单封装，可以和JDBC混合使用。
2、DBUtils对结果集自动封装为JavaBean是有着苛刻要求的：必须满足JavaBean的规范，其次Bean的getter与setter方法的名字与结果集的列名一一对应，而不要求JavaBean的私有成员与表结果集列名一一对应。
比如：
person表中有个字段叫：address，那么对应的JavaBean的Person类中必须有getAddress和setAddress两个方法，而Person类中可以将address属性命名为add，这是没问题的。
3、DBUtils可以将结果集封装为各种类型，主要有：Bean/List<Bean>，Map/List<Map>/Map<Map>，数组/List<数组>，列/List<列>，这些类型。
对于Map<Map>的类型使用KeyedHandler作为结果集处理器，内层的Map是“列名-值"对，外层的Map是“主键-内层Map的引用”，但此处的主键不一定就是数据库的主键，可以随意指定，比如：
ResultSetHandler h = new KeyedHandler("id");
Map found = (Map) queryRunner.query("select id, name, age from person", h);
Map jane = (Map) found.get(new Long(1)); // jane's id is 1
String janesName = (String) jane.get("name");
Integer janesAge = (Integer) jane.get("age");
Map found = (Map) queryRunner.query("select id, name, age from person", h);
Map jane = (Map) found.get(new Long(1)); // jane's id is 1
String janesName = (String) jane.get("name");
Integer janesAge = (Integer) jane.get("age");
4、DBUtils执行插入操作的时候，无法返回自增主键，这是一个很严重的问题，当然不能怪DBUtils，可以通过变通的方法来实现，比如
在MySQL中，执行完了一个插入SQL后，接着执行SELECT LAST_INSERT_ID()语句，就可以获取到自增主键。
5、DBUtils的性能和JDBC性能是一样，测试过程中没发现性能损失，拥有了很高性能的同时，而不失JDBC的灵活性。
6、对于JavaBean的成员类型定义，有一条原则那就是：尽可能使用包装类型，而不要使用基本类型。很多人不理解为什么，包括我见到一些傻B（，我提出让改为包装类型，他还信誓旦旦的说他的代码多牛多叼），都干好多年了，这个简单的道理还不知道:
//错误
int a1 = (Integer) null;
boolean x1 = (Boolean)null;
//正确
Integer a2 = (Integer) null;
Boolean x2 = (Boolean)null;
int a1 = (Integer) null;
boolean x1 = (Boolean)null;
//正确
Integer a2 = (Integer) null;
Boolean x2 = (Boolean)null;
实际上就是为了保证在查询结果为null的时候，也不会因为给基本类型赋null值而发生错误。
下面给出一个简单例子，作为以后写代码时候有点参考：
环境：
MySQL5.4
JDK1.5
建表SQL：
CREATE TABLE person (
id bigint(20) NOT NULL AUTO_INCREMENT,
name varchar(24) DEFAULT NULL,
age int(11) DEFAULT NULL,
address varchar(120) DEFAULT NULL,
PRIMARY KEY (id)
) ENGINE=MyISAM AUTO_INCREMENT=1 DEFAULT CHARSET=gbk
id bigint(20) NOT NULL AUTO_INCREMENT,
name varchar(24) DEFAULT NULL,
age int(11) DEFAULT NULL,
address varchar(120) DEFAULT NULL,
PRIMARY KEY (id)
) ENGINE=MyISAM AUTO_INCREMENT=1 DEFAULT CHARSET=gbk
Java代码：
public class Person {
private Long id;
private String sdf;
private String address2;
private Integer age;
public Person() {
}
public Person(String sdf) {
this.sdf = sdf;
}
public Person(String sdf, Integer age, String address) {
this.sdf = sdf;
this.age = age;
this.address2 = address;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getSdf() {
return sdf;
}
public void setSdf(String sdf) {
this.sdf = sdf;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public String getAddress() {
return address2;
}
public void setAddress(String address2) {
this.address2 = address2;
}
}
private Long id;
private String sdf;
private String address2;
private Integer age;
public Person() {
}
public Person(String sdf) {
this.sdf = sdf;
}
public Person(String sdf, Integer age, String address) {
this.sdf = sdf;
this.age = age;
this.address2 = address;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getSdf() {
return sdf;
}
public void setSdf(String sdf) {
this.sdf = sdf;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public String getAddress() {
return address2;
}
public void setAddress(String address2) {
this.address2 = address2;
}
}
测试
package com.lavasoft.dbstu;
import com.lavasoft.common.DBToolkit;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.apache.commons.dbutils.handlers.MapHandler;
import org.apache.commons.dbutils.handlers.ScalarHandler;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.List;
import java.util.Map;
/**
* Created by IntelliJ IDEA.
*
* @author leizhimin 2010-1-25 21:00:29
*/
public class PersonDAOImpl implements PersonDAO {
private static PersonDAOImpl instance = new PersonDAOImpl();
public static PersonDAOImpl getInstance() {
return instance;
}
public static void main(String[] args) {
//错误
int a1 = (Integer) null;
boolean x1 = (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
public Long 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 = new QueryRunner();
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()", new ScalarHandler(1));
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBToolkit.closeConnection(conn);
}
return id;
}
@Override
public int delete(Long id) {
int x = 0;
Connection conn = DBToolkit.getConnection();
QueryRunner qr = new QueryRunner();
try {
x = qr.update(conn, "DELETE FROM person WHERE id = ?", id);
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBToolkit.closeConnection(conn);
}
return x;
}
@Override
public int update(Person person) {
int x = 0;
Connection conn = DBToolkit.getConnection();
QueryRunner qr = new QueryRunner();
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);
}
return x;
}
@Override
public Person load(Long id) {
Connection conn = DBToolkit.getConnection();
QueryRunner qr = new QueryRunner();
try {
Person person = (Person) qr.query(conn, "SELECT * FROM person where id = ?", new BeanHandler(Person.class), 3L);
System.out.println(person.getId() + "\t" + person.getSdf() + "\t" + person.getAge() + "\t" + person.getAddress());
} catch (SQLException e) {
e.printStackTrace();
}
return null;
}
@Override
public List<Person> findPerson(String sql) {
Connection conn = DBToolkit.getConnection();
QueryRunner qr = new QueryRunner();
try {
List<Person> pset = (List) qr.query(conn, "SELECT * FROM person", new BeanListHandler(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();
}
return null;
}
public Person load4Map(Long id) {
Connection conn = DBToolkit.getConnection();
QueryRunner qr = new QueryRunner();
try {
//先将两个字段置为null
qr.update(conn, "update person set age = null,address =null where id =1");
Map<String, Object> map = qr.query(conn, "SELECT * FROM person where id = ?", new MapHandler(), 1L);
Person person = new Person();
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();
}
return null;
}
}
import com.lavasoft.common.DBToolkit;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.apache.commons.dbutils.handlers.MapHandler;
import org.apache.commons.dbutils.handlers.ScalarHandler;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.List;
import java.util.Map;
/**
* Created by IntelliJ IDEA.
*
* @author leizhimin 2010-1-25 21:00:29
*/
public class PersonDAOImpl implements PersonDAO {
private static PersonDAOImpl instance = new PersonDAOImpl();
public static PersonDAOImpl getInstance() {
return instance;
}
public static void main(String[] args) {
//错误
int a1 = (Integer) null;
boolean x1 = (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
public Long 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 = new QueryRunner();
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()", new ScalarHandler(1));
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBToolkit.closeConnection(conn);
}
return id;
}
@Override
public int delete(Long id) {
int x = 0;
Connection conn = DBToolkit.getConnection();
QueryRunner qr = new QueryRunner();
try {
x = qr.update(conn, "DELETE FROM person WHERE id = ?", id);
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBToolkit.closeConnection(conn);
}
return x;
}
@Override
public int update(Person person) {
int x = 0;
Connection conn = DBToolkit.getConnection();
QueryRunner qr = new QueryRunner();
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);
}
return x;
}
@Override
public Person load(Long id) {
Connection conn = DBToolkit.getConnection();
QueryRunner qr = new QueryRunner();
try {
Person person = (Person) qr.query(conn, "SELECT * FROM person where id = ?", new BeanHandler(Person.class), 3L);
System.out.println(person.getId() + "\t" + person.getSdf() + "\t" + person.getAge() + "\t" + person.getAddress());
} catch (SQLException e) {
e.printStackTrace();
}
return null;
}
@Override
public List<Person> findPerson(String sql) {
Connection conn = DBToolkit.getConnection();
QueryRunner qr = new QueryRunner();
try {
List<Person> pset = (List) qr.query(conn, "SELECT * FROM person", new BeanListHandler(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();
}
return null;
}
public Person load4Map(Long id) {
Connection conn = DBToolkit.getConnection();
QueryRunner qr = new QueryRunner();
try {
//先将两个字段置为null
qr.update(conn, "update person set age = null,address =null where id =1");
Map<String, Object> map = qr.query(conn, "SELECT * FROM person where id = ?", new MapHandler(), 1L);
Person person = new Person();
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();
}
return null;
}
}
注意：
从上面的过程看，每个SQL的执行都需要用到QueryRunner，这其实是一个普通的类，非线程安全。在创建这个QueryRunner对象的时候，每次都要new。
QueryRunner对象的创建方式很多，可以通过DateSource，也可以通过Connection来创建。从QueryRunner对象上，可以直接获取到DataSource或者Connection对象。
Dbutil 的使用示例
package cn.lining.test;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.List;
import java.util.Map;
import org.apache.commons.dbutils.DbUtils;
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;
publicclass test {
@SuppressWarnings("unchecked")
publicstaticvoid main(String[] args) throws ClassNotFoundException {
UserField userField =new UserField();
Connection conn =null;
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();
// 以下部分代码采用MapHandler存储方式查询
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("id ------------- name ");
System.out.println(map.get("id") +" ------------- "
+ map.get("name"));
// 以下部分代码采用MapListHandler存储方式查询
System.out.println("***Using MapListHandler***");
List lMap = (List) qRunner.query(conn,
"select * from mc_user_field", new MapListHandler());
System.out.println("id ------------- name ");
for (int i =0; i < lMap.size(); i++) {
Map vals = (Map) lMap.get(i);
System.out.println(vals.get("id") +" ------------- "
+ vals.get("name"));
}
// 以下部分代码采用BeanHandler存储方式查询
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()); // 以下部分代码采用BeanListHandler存储方式查询 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()); } // 以下部分代码采用ArrayHandler存储方式查询 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("id ------------- name "); System.out.println(array[0].toString() +" ------------- " + array[1].toString()); // 以下部分代码采用ArrayListHandler存储方式查询 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()); } // 以下部分代码采用ColumnListHandler存储方式查询指定列 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); } // 以下部分代码采用ScalarHandler存储方式查询 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(name); // 以下部分代码采用KeyedHandler存储方式查询 System.out.println("***Using KeyedHandler***"); Map<String, Map> map2 = (Map<String, Map>) qRunner.query(conn, "select * from mc_user_field", new KeyedHandler("name")); System.out.println("name: field_name2"); Map vals = (Map) map2.get("field_name2"); System.out.println(vals.get("id") +""+ vals.get("name") +"" + vals.get("type")); // 以下部分代码插入一条数据 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***"); // 以下部分代码更新一条数据 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***"); // 以下部分代码删除一条数据 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***"); } catch (SQLException ex) { 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); } }}
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.List;
import java.util.Map;
import org.apache.commons.dbutils.DbUtils;
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;
publicclass test {
@SuppressWarnings("unchecked")
publicstaticvoid main(String[] args) throws ClassNotFoundException {
UserField userField =new UserField();
Connection conn =null;
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();
// 以下部分代码采用MapHandler存储方式查询
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("id ------------- name ");
System.out.println(map.get("id") +" ------------- "
+ map.get("name"));
// 以下部分代码采用MapListHandler存储方式查询
System.out.println("***Using MapListHandler***");
List lMap = (List) qRunner.query(conn,
"select * from mc_user_field", new MapListHandler());
System.out.println("id ------------- name ");
for (int i =0; i < lMap.size(); i++) {
Map vals = (Map) lMap.get(i);
System.out.println(vals.get("id") +" ------------- "
+ vals.get("name"));
}
// 以下部分代码采用BeanHandler存储方式查询
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()); // 以下部分代码采用BeanListHandler存储方式查询 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()); } // 以下部分代码采用ArrayHandler存储方式查询 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("id ------------- name "); System.out.println(array[0].toString() +" ------------- " + array[1].toString()); // 以下部分代码采用ArrayListHandler存储方式查询 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()); } // 以下部分代码采用ColumnListHandler存储方式查询指定列 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); } // 以下部分代码采用ScalarHandler存储方式查询 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(name); // 以下部分代码采用KeyedHandler存储方式查询 System.out.println("***Using KeyedHandler***"); Map<String, Map> map2 = (Map<String, Map>) qRunner.query(conn, "select * from mc_user_field", new KeyedHandler("name")); System.out.println("name: field_name2"); Map vals = (Map) map2.get("field_name2"); System.out.println(vals.get("id") +""+ vals.get("name") +"" + vals.get("type")); // 以下部分代码插入一条数据 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***"); // 以下部分代码更新一条数据 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***"); // 以下部分代码删除一条数据 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***"); } catch (SQLException ex) { 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); } }}
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ArrayHandler：把结果集中的第一行数据转成对象数组。
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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。
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BeanHandler：将结果集中的第一行数据封装到一个对应的JavaBean实例中。
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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。
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ColumnListHandler：将结果集中某一列的数据存放到List中。
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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。
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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。
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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。
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ScalarHandler：将结果集中某一条记录的其中某一列的数据存成Object。
