Oracle海量數據導入MongoDB 採用JAVA反射-Penghao

首先人員表數據一共有100W條，前期開始是想先用PL/SQL導出爲xml格式，然後在SAX解析xml，後來發現xml超過10W條的時候解析起來會有問題，特別佔用CPU資源，後改用java程序直接連oracle和mongo，該表有50多個全大寫字段,如果先獲取到oracle表的列名和值,再寫條件判斷 if(列名==類屬性){ 新實例賦值}, 要寫50多個if代碼塊.覺得用反射更代碼更簡潔一點。

PatMaster實體類中的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爲oracle獲取的字段列，String.class是指改set方法需要傳入一個String，那麼m1就獲取到這個set方法了,如果不是public方法，需要setAccessible(true);然後invoke的時候傳入實例和數據庫中該字段值即可.

全部代碼：直接拷過去就可以用，你改個IP定義個你的實體類就好了,  如果搞不定加我QQ468165108

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

JAR下載地址：http://pan.baidu.com/s/1kTGNVoj 密碼：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");


		//自定義數據字典
		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()) {
			
			//計數器 每導入1W行記錄輸入
			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();
	}

}

public class FieldfUtils {



public  HashMap<String, String> GetPatMasterMinField() throws Exception{
Properties pro = new Properties();
InputStream in =getClass().getResourceAsStream("PAT_MASTER_Min.properties");
pro.load(in);
HashMap<String, String> mapMaxMin = new HashMap<String, String>();
HashMap<String, String> mapMinMax = new HashMap<String, String>();
Iterator it=pro.entrySet().iterator();
 while(it.hasNext()){
    Map.Entry entry=(Map.Entry)it.next();
    String key = (String) entry.getKey();
    String value = (String) entry.getValue();
    mapMaxMin.put(key, value);
    mapMinMax.put(value,key);
}
return mapMaxMin;
}


}

PAT_MASTER_Min.properties-----------------------------

PATIENT_ID=a1
INP_NO=a2
NAME=a3
NAME_PHONETIC=a4
SEX=a5
DATE_OF_BIRTH=a6
BIRTH_PLACE=a7
CITIZENSHIP=a8

#

 PATIENT_ID=a1 
左邊是oralce字段  右邊是Mongdb字段  自己定義就行了