change

src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/App3.java

+package com.taosdata.jdbc.cases;
+
+import org.apache.commons.dbcp2.BasicDataSource;
+
+import java.sql.*;
+
+public class App3 {
+
+	public static void main(String[] args) throws SQLException, ClassNotFoundException {
+
+		// 添加数据源1-TDengine,并且作为schema命名为“public”
+		String url = "jdbc:TAOS://127.0.0.1:6030/hdb";
+		Class.forName("com.taosdata.jdbc.TSDBDriver");
+		BasicDataSource dataSource = new BasicDataSource();
+		dataSource.setUrl(url);
+		dataSource.setUsername("root");
+		dataSource.setPassword("taosdata");
+
+		// 执行SQL语句，sql语句中表的引用必须用前面设置的schema名称，例如“testdata”就是schema“public“下的表，”datedim“是schema”test“下的表。
+		String sql = "select cast(s.updates as date ),t.id,t.cmt from public.testdata t , test.datedim s  "
+				+ "where cast(t.uptime as date )=s.updates and t.uptime<'2011-12-01 00:00:00' and t.id>100 limit 100 offset 10 ";
+		long startTime = System.currentTimeMillis();
+		Connection conn = dataSource.getConnection();
+		Statement stmt = conn.createStatement();
+//		ResultSet rs = stmt.executeQuery(sql);
+		long rowCount = 0;
+		String[] types = { "TABLE" };
+		ResultSet rs = conn.getMetaData().getTables("hdb", null, null, types);
+		while (rs.next()) {
+//			if (rowCount < 5) {
+			for (int j = 0; j < rs.getMetaData().getColumnCount(); j++) {
+				System.out.print(rs.getMetaData().getColumnName(j + 1) + ": " + rs.getObject(j) + ", ");
+			}
+			System.out.println();
+//			}
+			rowCount++;
+		}
+		rs.close();
+		System.out.println("\nGET COLUMN:");
+		rs = conn.getMetaData().getColumns("hdb", null, "sdata", null);
+		while (rs.next()) {
+//			if (rowCount < 5) {
+			ResultSetMetaData meta = rs.getMetaData();
+			for (int j = 0; j < rs.getMetaData().getColumnCount(); j++) {
+				if (j != 7) {
+					System.out.print(rs.getMetaData().getColumnName(j + 1) + ": " + rs.getObject(j) + ", ");
+					System.out.println();
+				}
+			}
+			System.out.println();
+//			}
+			rowCount++;
+		}
+		long endTime = System.currentTimeMillis();
+		System.out.println("execute time:" + (endTime - startTime) + "ms, resultset rows " + rowCount + ", "
+				+ rowCount * 1000 / (endTime - startTime) + " rows/sec");
+		rs.close();
+		stmt.close();
+		conn.close();
+	}
+
+}

src/connector/jdbc/src/test/java/com/taosdata/jdbc/cases/TdEngineSuperDataGen.java

+package com.taosdata.jdbc.cases;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.time.LocalDateTime;
+import java.time.ZoneId;
+import java.time.format.DateTimeFormatter;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Random;
+
+import org.apache.commons.codec.digest.DigestUtils;
+
+public class TdEngineSuperDataGen {
+
+	public static void main(String[] args) throws ClassNotFoundException, SQLException {
+		Class.forName("com.taosdata.jdbc.TSDBDriver");
+		String url = "jdbc:TAOS://127.0.0.1:6030/test?user=root&password=taosdata";
+		Connection conn = DriverManager.getConnection(url);
+		Statement stmt = conn.createStatement();
+		// create database
+		stmt.executeUpdate("create database if not exists hdb");
+		// use database
+		stmt.executeUpdate("use hdb");
+		stmt.executeUpdate("drop table if exists sdata");
+		// create table
+		stmt.executeUpdate(
+				"create table if not exists sdata (uptime timestamp, id int, x int , y int ,cmt binary(100)) tags(location nchar(100),tname nchar(100))");
+
+		ZoneId zoneId = ZoneId.systemDefault();
+		Map<String, String> table = new HashMap<>();
+		table.put("dt001", "beijing");
+		table.put("dt002", "shanghai");
+		table.put("dt003", "chongqing");
+		table.put("dt004", "xian");
+		for (Entry<String, String> kv : table.entrySet()) {
+			LocalDateTime d = LocalDateTime.now().minusMonths(2);
+			long rowCount = LocalDateTime.now().atZone(zoneId).toEpochSecond() - d.atZone(zoneId).toEpochSecond();
+			Random r = new Random();
+			StringBuilder sb = null;
+			long startTime = System.currentTimeMillis();
+			try {
+				for (long i = 0; i < rowCount; i++) {
+					sb = new StringBuilder("insert into " + kv.getKey() + " using sdata tags(" + kv.getValue() + ","
+							+ kv.getKey() + ") values('");
+					d = d.plusSeconds(1);
+					sb.append(d.format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.MS")));
+					sb.append("'," + i + "," + r.nextInt(100) + "," + r.nextInt(100) + ",'");
+					sb.append(DigestUtils.md5Hex(d.toString()));
+					sb.append("')");
+					stmt.executeUpdate(sb.toString());
+				}
+			} catch (SQLException e) {
+				System.out.println(d);
+				System.out.println(sb.toString());
+				e.printStackTrace();
+			}
+			long endTime = System.currentTimeMillis();
+			System.out.println("generate data execute time:" + (endTime - startTime) + "ms, resultset rows " + rowCount
+					+ ", " + rowCount * 1000 / (endTime - startTime) + " rows/sec");
+		}
+		stmt.close();
+		conn.close();
+	}
+
+}