Java内容重新整理删除过期的东西

Java/JavaDemo/codedemo/dbutils/DbUtilsDemo.java

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+package cn.aofeng.demo.dbutils;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.Properties;
+
+import javax.sql.DataSource;
+
+import org.apache.commons.dbutils.QueryRunner;
+import org.apache.commons.dbutils.ResultSetHandler;
+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.MapListHandler;
+import org.apache.log4j.Logger;
+
+import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;
+
+/**
+ * Apache DbUtils使用示例。
+ * 
+ * @author <a href="mailto:aofengblog@163.com">聂勇</a>
+ */
+public class DbUtilsDemo {
+
+    private static Logger _logger = Logger.getLogger(DbUtilsDemo.class);
+    
+    /**
+     * 创建JDBC连接池。
+     * 
+     * @param pros 数据库连接信息，里面包含4个键值对。
+     * <pre>
+     * jdbcDriver => JDBC驱动类名称
+     * url => 数据库JDBC连接地址
+     * user => 连接数据库的用户名
+     * password => 连接数据库的密码
+     * <pre>
+     * @return 连接池对象
+     */
+    private DataSource createDataSource(Properties pros) {
+        MysqlDataSource ds = new MysqlDataSource();
+        ds.setURL(pros.getProperty("url"));
+        ds.setUser(pros.getProperty("user"));
+        ds.setPassword(pros.getProperty("password"));
+        
+        return ds;
+    }
+    
+    /**
+     * 将查询结果集转换成Bean列表返回。
+     * 
+     * @param ds JDBC连接池
+     */
+    public void queryBeanList(DataSource ds) {
+        String sql = "select userId, userName, gender, age from student";
+        
+        QueryRunner run = new QueryRunner(ds);
+        ResultSetHandler<List<Student>> handler = new BeanListHandler<Student>(Student.class);
+        List<Student> result = null;
+        try {
+            result = run.query(sql, handler);
+        } catch (SQLException e) {
+            _logger.error("获取JDBC连接出错或执行SQL出错", e);
+        }
+        
+        if (null == result) {
+            return;
+        }
+        for (Student student : result) {
+            System.out.println(student);
+        }
+    }
+    
+    /**
+     * 将查询结果转换成Bean返回。
+     * 
+     * @param ds JDBC连接池
+     */
+    public void queryBean(DataSource ds, int userId) {
+        String sql = "select userId, userName, gender, age from student where userId=?";
+        
+        QueryRunner run = new QueryRunner(ds);
+        ResultSetHandler<Student> handler = new BeanHandler<Student>(Student.class);
+        Student result = null;
+        try {
+            result = run.query(sql, handler, userId);
+        } catch (SQLException e) {
+            _logger.error("获取JDBC连接出错或执行SQL出错", e);
+        }
+        
+        System.out.println(result);
+    }
+    
+    /**
+     * 将查询结果集转换成键值对列表返回。
+     * 
+     * @param ds JDBC连接池
+     */
+    public void queryMapList(DataSource ds) {
+        String sql = "select userId, userName, gender, age from student";
+        
+        QueryRunner run = new QueryRunner(ds);
+        ResultSetHandler<List<Map<String, Object>>> handler = new MapListHandler();
+        List<Map<String, Object>> result = null;
+        try {
+            result = run.query(sql, handler);
+        } catch (SQLException e) {
+            _logger.error("获取JDBC连接出错或执行SQL出错", e);
+        }
+        
+        if (null == result) {
+            return;
+        }
+        for (Map<String, Object> map : result) {
+            System.out.println(map);
+        }
+    }
+    
+    /**
+     * 将查询结果集转换成键值对列表返回。
+     * 
+     * @param ds JDBC连接池
+     * @param userId 用户编号
+     */
+    public void queryMap(DataSource ds, int userId) {
+        String sql = "select userId, userName, gender, age from student where userId=?";
+        
+        QueryRunner run = new QueryRunner(ds);
+        ResultSetHandler<Map<String, Object>> handler = new MapHandler();
+        Map<String, Object> result = null;
+        try {
+            result = run.query(sql, handler, userId);
+        } catch (SQLException e) {
+            _logger.error("获取JDBC连接出错或执行SQL出错", e);
+        }
+        
+        System.out.println(result);
+    }
+    
+    /**
+     * 将查询结果集转换成键值对列表返回。
+     * 
+     * @param ds JDBC连接池
+     */
+    public void queryCustomHandler(DataSource ds) {
+        String sql = "select userId, userName, gender, age from student";
+        
+        // 新实现一个ResultSetHandler
+        ResultSetHandler<List<Student>> handler = new ResultSetHandler<List<Student>>() {
+            @Override
+            public List<Student> handle(ResultSet resultset)
+                    throws SQLException {
+                List<Student> result = new ArrayList<Student>();
+                while (resultset.next()) {
+                    Student student = new Student();
+                    student.setUserId(resultset.getInt("userId"));
+                    student.setUserName(resultset.getString("userName"));
+                    student.setGender(resultset.getString("gender"));
+                    student.setAge(resultset.getInt("age"));
+                    result.add(student);
+                }
+                
+                return result;
+            }
+            
+        };
+        
+        QueryRunner run = new QueryRunner(ds);
+        List<Student> result = null;
+        try {
+            result = run.query(sql, handler);
+        } catch (SQLException e) {
+            _logger.error("获取JDBC连接出错或执行SQL出错", e);
+        }
+        
+        if (null == result) {
+            return;
+        }
+        for (Student student : result) {
+            System.out.println(student);
+        }
+    }
+    
+    public static void main(String[] args) {
+        Properties pros = new Properties();
+        pros.put("jdbcDriver", "com.mysql.jdbc.Driver");
+        pros.put("url", "jdbc:mysql://192.168.56.102:19816/test?useUnicode=true&characterEncoding=UTF8");
+        pros.put("user", "uzone");
+        pros.put("password", "uzone");
+        
+        DbUtilsDemo demo = new DbUtilsDemo();
+        DataSource ds = demo.createDataSource(pros);
+        demo.queryBeanList(ds);
+        demo.queryBean(ds, 1);
+        demo.queryBean(ds, 9);
+        demo.queryMapList(ds);
+        demo.queryMap(ds, 3);
+        demo.queryMap(ds, 9);
+        demo.queryCustomHandler(ds);
+    }
+
+}