Apache DBUtils使用總結

Apache DBUtils浣跨敤鎬葷粨

DBUtils鏄釜灏忓閥鐨凧DBC杞婚噺绾у皝瑁呯殑宸ュ叿鍖咃紝鍏舵渶鏍稿績鐨勭壒鎬ф槸缁撴灉闆嗙殑灏佽锛屽彲浠ョ洿鎺ュ皢鏌ヨ鍑烘潵鐨勭粨鏋滈泦灏佽鎴怞avaBean锛岃繖灏變負鎴戜滑鍋氫簡鏈€鏋嚗涔忓懗銆佹渶瀹規槗鍑洪敊鐨勪竴澶ч儴鍒嗗伐浣溿€? 聽鍦ㄤ嬌鐢―BUtils涔嬪墠锛屽簲璇ユ敞鎰忎竴浜涢棶棰橈細

1銆丏BUtils鏄疛DBC鐨勭畝鍗曞皝瑁咃紝鍙互鍜孞DBC娣峰悎浣跨敤銆?

2銆丏BUtils瀵圭粨鏋滈泦鑷姩灏佽涓篔avaBean鏄湁鐫€鑻涘埢瑕佹眰鐨勶細蹇呴』婊¤凍JavaBean鐨勮鑼冿紝鍏舵Bean鐨刧etter涓巗etter鏂規硶鐨勫悕瀛椾笌缁撴灉闆嗙殑鍒楀悕涓€涓€瀵瑰簲锛岃€屼笉瑕佹眰JavaBean鐨勭鏈夋垚鍛樹笌琛ㄧ粨鏋滈泦鍒楀悕涓€涓€瀵瑰簲銆? 姣斿锛? person琛ㄤ腑鏈変釜瀛楁鍙細address锛岄偅涔堝搴旂殑JavaBean鐨凱erson绫諱腑蹇呴』鏈塯etAddress鍜宻etAddress涓や釜鏂規硶锛岃€孭erson绫諱腑鍙互灏哸ddress灞炴€у懡鍚嶄負add锛岃繖鏄病闂鐨勩€?

3銆丏BUtils鍙互灏嗙粨鏋滈泦灏佽涓哄悇绉嶇被鍨嬶紝涓昏鏈夛細Bean/List<Bean>锛孧ap/List<Map>/Map<Map>锛屾暟缁?List<鏁扮粍>锛屽垪/List<鍒?gt;锛岃繖浜涚被鍨嬨€? 瀵逛簬Map<Map>鐨勭被鍨嬩嬌鐢↘eyedHandler浣滀負缁撴灉闆嗗鐞嗗櫒锛屽唴灞傜殑Map鏄€滃垪鍚?鍊?瀵癸紝澶栧眰鐨凪ap鏄€滀富閿?鍐呭眰Map鐨勫紩鐢ㄢ€濓紝浣嗘澶勭殑涓婚敭涓嶄竴瀹氬氨鏄暟鎹簱鐨勪富閿紝鍙互闅忔剰鎸囧畾锛屾瘮濡傦細

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");

4銆丏BUtils鎵ц鎻掑叆鎿嶄綔鐨勬椂鍊欙紝鏃犳硶杩斿洖鑷涓婚敭锛岃繖鏄竴涓緢涓ラ噸鐨勯棶棰橈紝褰撶劧涓嶈兘鎬狣BUtils锛屽彲浠ラ€氳繃鍙橀€氱殑鏂規硶鏉ュ疄鐜幫紝姣斿鍦∕ySQL涓紝鎵ц瀹屼簡涓€涓彃鍏QL鍚庯紝鎺ョ潃鎵цSELECT LAST_INSERT_ID()璇彞锛屽氨鍙互鑾峰彇鍒拌嚜澧炰富閿€? 聽 5銆丏BUtils鐨勬€ц兘鍜孞DBC鎬ц兘鏄竴鏍鳳紝娴嬭瘯杩囩▼涓病鍙戠幇鎬ц兘鎹熷け锛屾嫢鏈変簡寰堥珮鎬ц兘鐨勫悓鏃訛紝鑰屼笉澶盝DBC鐨勭伒娲繪€с€? 聽 6銆佸浜嶫avaBean鐨勬垚鍛樼被鍨嬪畾涔夛紝鏈変竴鏉″師鍒欓偅灏辨槸锛氬敖鍙兘浣跨敤鍖呰绫誨瀷锛岃€屼笉瑕佷嬌鐢ㄥ熀鏈被鍨嬨€?

<span style="white-space:pre">	</span>//閿欒
        int a1 = (Integer) null;
        boolean x1 = (Boolean)null;
        //姝ｇ‘
        Integer a2 = (Integer) null;
        Boolean x2 = (Boolean)null;

瀹為檯涓婂氨鏄負浜嗕繚璇佸湪鏌ヨ缁撴灉涓簄ull鐨勬椂鍊欙紝涔熶笉浼氬洜涓虹粰鍩烘湰绫誨瀷璧媙ull鍊艱€屽彂鐢熼敊璇€?

涓嬮潰缁欏嚭涓€涓畝鍗曚緥瀛愶紝浣滀負浠ュ悗鍐欎唬鐮佹椂鍊欐湁鐐瑰弬鑰冿細

鐜锛? MySQL5.4 JDK1.5

寤鴻〃SQL锛?

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

Java浠ｇ爜锛?

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; 
        } 
}

娴嬭瘯锛?

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) { 
                //閿欒 
                int a1 = (Integer) null; 
                boolean x1 = (Boolean) null; 
                //姝ｇ‘ 
                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); 
                        //鑾峰彇鏂闆璁闆綍鐨勮嚜澧炰富閿?
                        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 { 
                        //鍏堝皢涓や釜瀛楁缃負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; 
        }

娉ㄦ剰锛? 浠庝笂闈㈢殑杩囩▼鐪嬶紝姣忎釜SQL鐨勬墽琛岄兘闇€瑕佺敤鍒癚ueryRunner锛岃繖鍏跺疄鏄竴涓櫘閫氱殑绫夥紝闈炵嚎绋嬪畨鍏ㄣ€傚湪鍒涘緩杩欎釜QueryRunner瀵矽薄鐨勬椂鍊欙紝姣忔閮借new銆? QueryRunner瀵矽薄鐨勫垱寤烘柟寮忓緢澶氾紝鍙互閫氳繃DateSource锛屼篃鍙互閫氳繃Connection鏉ュ垱寤恒€備粠QueryRunner瀵矽薄涓婏紝鍙互鐩存帴鑾峰彇鍒癉ataSource鎴栬€匔onnection瀵矽薄銆?

Dbutil 鐨勪嬌鐢ㄧず渚嬄?

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);//鍏抽棴鑷姩鎻愪氦
   QueryRunner qRunner =new QueryRunner();

   // 浠ヤ笅閮ㄥ垎浠ｇ爜閲囩敤MapHandler瀛樺偍鏂瑰紡鏌ヨ
   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"));

   // 浠ヤ笅閮ㄥ垎浠ｇ爜閲囩敤MapListHandler瀛樺偍鏂瑰紡鏌ヨ
   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"));
   }

   // 浠ヤ笅閮ㄥ垎浠ｇ爜閲囩敤BeanHandler瀛樺偍鏂瑰紡鏌ヨ
   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());

   // 浠ヤ笅閮ㄥ垎浠ｇ爜閲囩敤BeanListHandler瀛樺偍鏂瑰紡鏌ヨ
   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());
   }

   // 浠ヤ笅閮ㄥ垎浠ｇ爜閲囩敤ArrayHandler瀛樺偍鏂瑰紡鏌ヨ
   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());

   // 浠ヤ笅閮ㄥ垎浠ｇ爜閲囩敤ArrayListHandler瀛樺偍鏂瑰紡鏌ヨ
   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());
   }

   // 浠ヤ笅閮ㄥ垎浠ｇ爜閲囩敤ColumnListHandler瀛樺偍鏂瑰紡鏌ヨ鎸囧畾鍒?   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);
   }

   // 浠ヤ笅閮ㄥ垎浠ｇ爜閲囩敤ScalarHandler瀛樺偍鏂瑰紡鏌ヨ
   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);

   // 浠ヤ笅閮ㄥ垎浠ｇ爜閲囩敤KeyedHandler瀛樺偍鏂瑰紡鏌ヨ
   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"));

   // 浠ヤ笅閮ㄥ垎浠ｇ爜鎻掑叆涓€鏉℃暟鎹?   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***");

   // 浠ヤ笅閮ㄥ垎浠ｇ爜鏇存柊涓€鏉℃暟鎹?   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***");

   // 浠ヤ笅閮ㄥ垎浠ｇ爜鍒犻櫎涓€鏉℃暟鎹?   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);
  }
 }
}

鏈€鍚庣畝杩頒竴浜沝bUtils鐨勫悇涓粨鏋滈泦澶勭悊鍣細

ArrayHandler锛氭妸缁撴灉闆嗕腑鐨勭涓€琛屾暟鎹漿鎴愬璞℃暟缁勩€?
ArrayListHandler锛氭妸缁撴灉闆嗕腑鐨勬瘡涓€琛屾暟鎹兘杞垚涓€涓璞℃暟缁勶紝鍐嶅瓨鏀懼埌List涓€?
BeanHandler锛氬皢缁撴灉闆嗕腑鐨勭涓€琛屾暟鎹皝瑁呭埌涓€涓搴旂殑JavaBean瀹炰緥涓€?
BeanListHandler锛氬皢缁撴灉闆嗕腑鐨勬瘡涓€琛屾暟鎹兘灏佽鍒頒竴涓搴旂殑JavaBean瀹炰緥涓紝瀛樻斁鍒癓ist閲屻€?
ColumnListHandler锛氬皢缁撴灉闆嗕腑鏌愪竴鍒楃殑鏁版嵁瀛樻斁鍒癓ist涓€?
聽KeyedHandler锛氬皢缁撴灉闆嗕腑鐨勬瘡涓€琛屾暟鎹兘灏佽鍒頒竴涓狹ap閲岋紝鐒跺悗鍐嶆牴鎹寚瀹氱殑key鎶婃瘡涓狹ap鍐嶅瓨鏀懼埌涓€涓狹ap閲屻€?
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