ElastcSearch的Mapping映射建立

根据oracle的字段来建立ElasticSearch的Mapping

public class Start {

    private static Logger log = LoggerFactory.getLogger(Start.class);
    private static TransportClient client = null;

    static{
        try {
            client = getClient();
        } catch (UnknownHostException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) throws MalformedURLException, ClassNotFoundException {
        DoMapping();
    }

    private static void DoMapping() {
        String template = "{\n"
                            +"\t\""+Constant.INDEX+"\":{\n"
                                +"\t\t\"properties\":{\n"
                                        + "\t\t{#}\n"
                                + "\t\t\t\t}\n"
                                + "\t\t}\n"
                            +"}";
        String fieldString =  GetOracleMapping();
        template = template.replace("{#}",fieldString);
        client.admin().indices().prepareCreate(Constant.INDEX).addMapping(Constant.INDEX, template).get();
        System.out.println(template);
        log.info("创建ElasticSearch Mapping完成！！！");
    }

    private static TransportClient getClient() throws UnknownHostException {
        Settings settings = Settings.settingsBuilder().put("cluster.name", Constant.CLUSTER).build();
        TransportClient client = TransportClient.builder().settings(settings).build();
        client.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName(Constant.ESHOST), Constant.ESPORT));
        return client;
    }

    public static String GetOracleMapping() {
        StringBuilder fieldstring = new StringBuilder();
        Connection con = null;
        PreparedStatement pre = null;
        ResultSet result = null;
        try {
            Class.forName(Constant.DBDRIVER);
            log.info("开始尝试连接数据库！");
            con = DriverManager.getConnection(Constant.DBURL, Constant.DBUSER, Constant.DBPASSWD);
            log.info("连接成功！");
            String sql = "select * from "+Constant.DBTAB+" where rownum=?";
            pre = con.prepareStatement(sql);
            pre.setInt(1, 1);
            result = pre.executeQuery();
            ResultSetMetaData d = result.getMetaData();
            int c = d.getColumnCount();

            for (int i = 1; i <= c; i++) {
                fieldstring.append("\t\t\t\t\"" + d.getColumnName(i).toLowerCase() + "\": {\n");
                fieldstring.append("\t\t\t\t\t\t\"type\": \""
                        + GetElasticSearchMappingType(d.getColumnTypeName(i)) + "\n");
                if (i == c) {
                    fieldstring.append("\t\t\t\t\t}\n");
                } else {
                    fieldstring.append("\t\t\t\t\t},\n");
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (result != null)
                    result.close();
                if (pre != null)
                    pre.close();
                if (con != null)
                    con.close();
                log.info("数据库连接已关闭！");
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return fieldstring.toString();
    }

    private static String GetElasticSearchMappingType(String dbtype) {
        String es = "string";
        switch (dbtype) {
        case "DATE":
            es = "date\"\n"+"\t\t\t\t\t\t,\"format\":\"yyyy-MM-dd\"\n"+"\t\t\t\t\t\t,\"null_value\":\"1900-01-01\"";
            break;
        case "NUMBER":
            es = "double\"\n"+"\t\t\t\t\t\t,\"null_value\":0.00";
            break;
        default:
            es = "string\"\n"+"\t\t\t\t\t\t,\"null_value\":\"\"";
            break;
        }
        return es;
    }

}

其中读取配置文件的内容

db.driver=oracle.jdbc.driver.OracleDriver
db.url=jdbc:oracle:thin:@192.168.49.140:1521:DBDATA
db.user=ms_orders
db.passwd=ms1_orders
db.table=t_order

es.host=192.168.46.154
es.port=9300
cluster.name=dinpayEs
es.index=t_orders