DBUtils应用详解

DBUtils

环境搭建：

1、复制库文件

c3p0的jar及c3p0-config.xml

dbuitls的jar包

mysql驱动包

2、复制并修改DBManager

CRID

插入

public void insert() throws SQLException{ QueryRunner runner = new QueryRunner(DBManager_c3p0.getDataSource()); String sql = "insert into user(id,name,password,email,birthday) values(null,?,?,?,?)"; Object[] param={"by","sss","[email protected]","1980-03-04"}; runner.update(sql, param); }

删除

public void delete() throws SQLException{ QueryRunner runner = new QueryRunner(DBManager_c3p0.getDataSource()); String sql = "delete from user where name=?"; Object[] param ={"by"}; runner.update(sql, param); }

查询

public User find() throws SQLException{ QueryRunner runner = new QueryRunner(DBManager_c3p0.getDataSource()); String sql = "select * from user where id=?"; User u = (User)runner.query(sql, newBeanHandler(User.class),1); return u; }

public void getAll() throws SQLException{ QueryRunner runner = new QueryRunner(DBManager_c3p0.getDataSource()); String sql = "select * from user"; List<User> list = (List<User>) runner.query(sql, newBeanListHandler(User.class)); System.out.println(list.size()); }

批处理

public void bath() throws SQLException{ QueryRunner runner = new QueryRunner(DBManager_c3p0.getDataSource()); String sql = "insert into user(id,name,password) values(?,?,?)"; Object[][] params = {{5,"Jake","aaa"},{6,"John","bbb"},{7,"Jansen","ccc"}}; runner.batch(sql, params); }

ResultSetHandler 接口的实现类

ArrayHandler

public void testArrayHandler() throws SQLException{ QueryRunner runner = new QueryRunner(DBManager_c3p0.getDataSource()); String sql = "select * from user"; Object[] result = runner.query(sql, new ArrayHandler()); System.out.println(Arrays.asList(result)); }

ArrayListHandler

public void testArrayListHandler() throws SQLException{ QueryRunner runner = new QueryRunner(DBManager_c3p0.getDataSource()); String sql = "select * from user"; List<Object[]> result = (List<Object[]>) runner.query(sql, new ArrayListHandler()); for(int i=0; i<result.size(); i++){ System.out.println(Arrays.asList(result.get(i))); } }

ColumnListHandler

public void testColumnListHandler() throws SQLException{ QueryRunner runner = new QueryRunner(DBManager_c3p0.getDataSource()); String sql = "select * from user"; List<Object> result = (List<Object>) runner.query(sql, new ColumnListHandler("name")); System.out.println(result); }

KeyedHandler

public void testKeyedHandler() throws SQLException{ QueryRunner runner = new QueryRunner(DBManager_c3p0.getDataSource()); String sql = "select * from user"; Map<Integer,Map<String,Object>> map = (Map) runner.query(sql, new KeyedHandler("id")); for(Map.Entry<Integer,Map<String,Object>> me : map.entrySet()){ int id = me.getKey(); Map<String,Object> innermap = me.getValue(); for(Map.Entry<String, Object> innerme: innermap.entrySet()){ String name = innerme.getKey(); Object value = innerme.getValue(); System.out.println(name + "=" + value); } } }

MapListHandler

public void testMapListHandler() throws SQLException{ QueryRunner runner = new QueryRunner(DBManager_c3p0.getDataSource()); String sql = "select * from user"; List<Map<String,Object>> result = (List<Map<String,Object>>) runner.query(sql, new MapListHandler()); for(int i=0; i<result.size(); i++){ Map<String, Object> map = result.get(i); System.out.println("---------------------"); for(Map.Entry<String, Object> me : map.entrySet() ){ String colName = me.getKey(); Object value = me.getValue(); System.out.println(colName + " = " + value); } } }