java操作数据。

package a;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.util.Date;

public class Main {
	private static Connection c = null;
	private static PreparedStatement ps = null;
	private static ResultSet rs = null;
	private static ResultSetMetaData rsmd = null;

	public static void main(String[] args) {
		Date d = new Date();
		System.out.println(d);
		try {
			Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
			c = DriverManager.getConnection("jdbc:sqlserver://localhost:1433;databasename=dc2019;Encrypt=false", "sa",
					"dinglin");
			ps = c.prepareStatement(
					"select * from (select *,volume - lag(volume,1,0) over (partition by InstrumentID,tradingday order by InstrumentID asc, tradingday asc , volume asc ) as tmpvol from t_m1 ) as tmp_t1 where  tmpvol <> 0 order by instrumentid asc, tradingday asc, Volume asc\r\n");
			rs = ps.executeQuery();
			rsmd = rs.getMetaData();
			int getColumnCount = rsmd.getColumnCount();
			while (rs.next()) {
				for (int i = 1; i <= getColumnCount; i++) {
					System.out.print(rs.getString(i) + ",");
				}
				System.out.println();
			}
		} catch (Exception e) {
			e.printStackTrace();

		} finally {
			try {
				if (rs != null) {
					rs.close();
					rs = null;
				}
				if (ps != null) {
					ps.close();
					ps = null;
				}
				if (c != null) {
					c.close();
					c = null;
				}

			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		d = new Date();
		System.out.println(d);

	}

}