Oracle海量数据导入MongoDB 采用JAVA反射-Penghao

标签：mongodb

首先人员表数据一共有100W条，前期开始是想先用PL/SQL导出为xml格式，然后在SAX解析xml，后来发现xml超过10W条的时候解析起来会有问题，特别占用CPU资源，后改用java程序直接连oracle和mongo，该表有50多个全大写字段,如果先获取到oracle表的列名和值,再写条件判断 if(列名==类属性){ 新实例赋值}, 要写50多个if代码块.觉得用反射更代码更简洁一点。

PatMaster实体类中的NAME字段

String NAME;
public String getNAME() {
		return NAME;
	}
public void setNAME(String nAME) {
		NAME = nAME;
	}

Class<PatMaster> c = PatMaster.class;

PatMaster patMaster = c.newInstance();

Method m1 = c.getDeclaredMethod("set" + column, String.class);
m1.setAccessible(true);   
m1.invoke(patMaster, value);

column为oracle获取的字段列，String.class是指改set方法需要传入一个String，那么m1就获取到这个set方法了,如果不是public方法，需要setAccessible(true);然后invoke的时候传入实例和数据库中该字段值即可.

全部代码：直接拷过去就可以用，你改个IP定义个你的实体类就好了,  如果搞不定加我QQ468165108

用到的jar包 ：ojdbc14.jar，mongo-2.5.3.jar  

JAR下载地址：http://pan.baidu.com/s/1kTGNVoj 密码：69fz , 

	public void OdbcTOMongo() throws Exception {


		Mongo mongo = new Mongo("192.168.1.3", 30000);
		DB db = mongo.getDB("test");
		db.authenticate("user", "user".toCharArray());
		DBCollection dbc = db.getCollection("patMasterIndex");


		//自定义数据字典
		FieldfUtils fu = new FieldfUtils();
		HashMap<String, String> map = fu.GetMinField();
		
		Class.forName("oracle.jdbc.driver.OracleDriver");
		String url = "jdbc:oracle:thin:@192.168.1.111:1521:dba";
		String user = "user";
		String password = "pwd";
		Connection conn = DriverManager.getConnection(url, user, password);
		PreparedStatement ps = conn.prepareStatement("select * from PAT_MASTER_INDEX");
		ResultSet rs = ps.executeQuery();
		int num = 0;
		ResultSetMetaData rsmd = rs.getMetaData();
		int colCount = rsmd.getColumnCount();
		
		while (rs.next()) {
			
			//计数器 每导入1W行记录输入
			num++;
			if(num%10000==0){
				System.out.println(num);
			}
			Class<PatMaster> c = PatMaster.class;
			PatMaster patMaster = c.newInstance();
			BasicDBObject bdo = new BasicDBObject();
			
			for (int i = 1; i <= colCount; i++) {
				String column = rsmd.getColumnName(i);
				Object object = rs.getObject(i);
				String value = "";
				if (object == null) {
				} else {
					value = (String) object.toString();
				}
				Method m1 = c.getDeclaredMethod("set" + column, String.class);
				m1.setAccessible(true);
				m1.invoke(patMaster, value);
				
				String minName = map.get(column);
				bdo.put(minName, value);
			}
			dbc.insert(bdo);
		}


		rs.close();
		ps.close();
		conn.close();
	}

}

Oracle海量数据导入MongoDB 采用JAVA反射-Penghao

标签：mongodb

原文地址：http://blog.csdn.net/ojackhao/article/details/47340881