ProcessDB实时/时序数据库——JDBC_Prepared读写历史时序数据

目录

前言

一、历史时序数据字段介绍

二、插入历史时序数据

三、修改历史时序数据

四、查询历史时序数据

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前言

         前文提到了用statement的方式，操作ProcessDB时序数据库，我们实际工作中可能更常使用的是   PreparedStatement方式，优点如下：1、可以防止SQL注入攻击。 2、进行动态查询。3、执行更快。4、简化拼接过程。所以，我在这里着重讲解下如何用PreparedStatement方式，操作ProcessDB实时/时序数据库的历史时序数据

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一、历史时序数据字段介绍

CREATE TABLE HIS_TABLE ( 

 ID_F          INT;//数据点ID,

 NAME_F        STRING;//数据点名称,

 VALUE_F       STRING;//历史数据值,

 UNIT_F        STRING;//数据单位,

 QUALITY_F     STRING;//数据质量,

 TIME_F        STRING;//历史数据时间,

 MESSAGE_F     STRING;//历史数据值(特殊),

 DATE_TYPE     STRING;//数据类型,

 INTERVAL_F    INT;//历史数据时间间隔

 )

二、插入历史时序数据

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.Statement;

public class Test {
	public static void main(String[] args) throws Exception {
		try {
			Class.forName("com.processdb.jdbc.JDBC");

			Connection connection = null;
			Statement statement = null;
			try {
				// 对数据库进行连接
				connection = DriverManager.getConnection("jdbc:processdb://localhost:8301/instance01", "root", "root");
				statement = connection.createStatement();
				// 设置超时时间
				statement.setQueryTimeout(30); // set timeout to 30 sec.
					// 插入sql
					/**插入历史数据表 HIS_TABLE
					 * 所需字段
					 * name_f = 'public.sys.PDB_OS_CPU_USAGE' 数据点的位置（必填）
					 * NAME_F 数据点的位置（必填）
					 * TIME_F 历史数据的时间（必填）
					 * DATE_TYPE 数据类型（必填）
					 * VALUE_F 插入数据的值（必填）
					 */
					String sql = "INSERT INTO HIS_TABLE (NAME_F,TIME_F,DATE_TYPE,VALUE_F) values (?,?,?,?)";
					// 运行sql发起请求
					String param1 = "D77.T77.P77";
					String param2 = "1669702505000";
					String param3 = "FLOAT32";
					String param4 = "77";
					PreparedStatement ps = connection.prepareStatement(sql);
					ps.setString(1, param1);
					ps.setString(2, param2);
					ps.setString(3,	param3);
					ps.setString(4,	param4);
					// 运行sql发起请求
					ps.executeUpdate();
					// 查询结果存储在ResultSet
					System.out.println("Insert history data into table: history_table.");}
			 catch (SQLException e) {
				System.err.println(e.getMessage());
				e.printStackTrace();
			} finally {
				try {

					if (statement != null) {
						statement.close();
					}
					if (connection != null) {
						connection.close();
					}
				} catch (SQLException e) {
					System.err.println(e);
				}
			}
		} catch (ClassNotFoundException e1) {
			e1.printStackTrace();
			return;
		}
		return;
	}
}

三、修改历史时序数据

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.Statement;
 
public class Test {
	public static void main(String[] args) {
		try {
			Class.forName("com.processdb.jdbc.JDBC");

			Connection connection = null;
			Statement statement = null;
			try {
				// 对数据库进行连接
				connection = DriverManager.getConnection("jdbc:processdb://localhost:8301/instance01", "root", "root");
				statement = connection.createStatement();
				// 设置超时时间
				statement.setQueryTimeout(30); // set timeout to 30 sec.
					// sql
					/**修改历史数据 HIS_TABLE
					 * 所需字段
					 * name_f  数据库名称加数据表名称加数据点名称（例如：public.sys.PDB_OS_CPU_USAGE）
					 * TIME_F  历史数据时间
					 * 可修改字段
					 * value_f  历史数据数据值
					 */
					String sql = "Update  HIS_TABLE set value_f = ? where  name_f= ? and TIME_f= ?  ";		
					// 运行sql发起请求
					String param1 = "777";
					String param2 = "D7.T7.P7";
					String param3 = "2022-11-22 15:48:34";
					PreparedStatement ps = connection.prepareStatement(sql);
					ps.setString(1, param1);
					ps.setString(3, param2);
					ps.setString(2, param3);
					ps.executeUpdate();
					System.out.println("Update historyData Success");

			} catch (SQLException e) {
				System.err.println(e.getMessage());
				e.printStackTrace();
			} finally {
				try {

					if (statement != null) {
						statement.close();
					}
					if (connection != null) {
						connection.close();
					}
				} catch (SQLException e) {
					System.err.println(e);
				}
			}
		} catch (ClassNotFoundException e1) {
			e1.printStackTrace();
			return;
		}
		return;
	}
}

四、查询历史时序数据

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
 
public class Test {
	public static void main(String[] args) {
		try {
			Class.forName("com.processdb.jdbc.JDBC");

			Connection connection = null;
			Statement statement = null;
			try {
				// 对数据库进行连接
				connection = DriverManager.getConnection("jdbc:processdb://localhost:8301/instance01", "root", "root");
				statement = connection.createStatement();
				// 设置超时时间
				statement.setQueryTimeout(30); // set timeout to 30 sec.
				ResultSet rs = null;

					// 查询sql
					/**查询历史数据表 HIS_TABLE
					 * 所需字段
					 * name_f='public.sys.PDB_OS_CPU_USAGE' 数据点的位置(必填)
					 * time_f>'2022-10-26 00:00:00' and time_f<'2022-10-26 15:35:18'数据时间段
					 * 超限
					 * 可查询字段
					 * ID_F 数据id
					 * NAME_F 数据点的位置
					 * TIME_F 历史数据时间
					 * QUALITY_F 数据质量是否完好
					 * VALUE_F 历史数据值
					 */
					String sql = "select  id_f,name_f,INTERVAL_F,time_f,QUALITY_F,value_f  from his_table where  name_f= ? and time_f> ? and time_f< ?";
					// 填充sql所需要的参数
					String param1 = "public.sys.PDB_OS_CPU_USAGE";
					String param2 = "2022-10-26 00:00:00";
					String param3 = "2022-10-26 14:33:50";
					PreparedStatement ps = connection.prepareStatement(sql);
					ps.setString(1, param1);
					ps.setString(2, param2);
					ps.setString(3, param3);
					// 运行sql发起请求
					rs = ps.executeQuery();
					// 查询结果存储在ResultSet(可以返回多条结果)
					System.out.println("Query history data from table: his_table.");
					while (rs.next()) {
						// read the result set
						System.out.println("id_f:" + rs.getString("id_f") + ",name_f:" + rs.getString("name_f")+  ",INTERVAL_F:" + rs.getString("INTERVAL_F")+ ",QUALITY_F" + rs.getString("QUALITY_F")+  ",TIME_F:" + rs.getString("time_f") + ",value_f:" + rs.getString("value_f"));	}
					System.out.println("Count: " + rs.getRow());

			} catch (SQLException e) {
				System.err.println(e.getMessage());
				e.printStackTrace();
			} finally {
				try {

					if (statement != null) {
						statement.close();
					}
					if (connection != null) {
						connection.close();
					}
				} catch (SQLException e) {
					System.err.println(e);
				}
			}
		} catch (ClassNotFoundException e1) {
			e1.printStackTrace();
			return;
		}
		return;
	}
}

示例运行如下：

Query history data from table: his_table.
id_f:1001000001,name_f:PUBLIC.SYS.PDB_OS_CPU_USAGE,INTERVAL_F:0,QUALITY_FGOOD,TIME_F:2022-10-26 14:33:41.0,value_f:0.0
id_f:1001000001,name_f:PUBLIC.SYS.PDB_OS_CPU_USAGE,INTERVAL_F:0,QUALITY_FGOOD,TIME_F:2022-10-26 14:33:42.0,value_f:0.3071719
id_f:1001000001,name_f:PUBLIC.SYS.PDB_OS_CPU_USAGE,INTERVAL_F:0,QUALITY_FGOOD,TIME_F:2022-10-26 14:33:43.0,value_f:3.985534
id_f:1001000001,name_f:PUBLIC.SYS.PDB_OS_CPU_USAGE,INTERVAL_F:0,QUALITY_FGOOD,TIME_F:2022-10-26 14:33:44.0,value_f:1.1572248
id_f:1001000001,name_f:PUBLIC.SYS.PDB_OS_CPU_USAGE,INTERVAL_F:0,QUALITY_FGOOD,TIME_F:2022-10-26 14:33:45.0,value_f:1.2477847
id_f:1001000001,name_f:PUBLIC.SYS.PDB_OS_CPU_USAGE,INTERVAL_F:0,QUALITY_FGOOD,TIME_F:2022-10-26 14:33:46.0,value_f:4.986512
id_f:1001000001,name_f:PUBLIC.SYS.PDB_OS_CPU_USAGE,INTERVAL_F:0,QUALITY_FGOOD,TIME_F:2022-10-26 14:33:47.0,value_f:7.0197315
id_f:1001000001,name_f:PUBLIC.SYS.PDB_OS_CPU_USAGE,INTERVAL_F:0,QUALITY_FGOOD,TIME_F:2022-10-26 14:33:48.0,value_f:3.041393
id_f:1001000001,name_f:PUBLIC.SYS.PDB_OS_CPU_USAGE,INTERVAL_F:0,QUALITY_FGOOD,TIME_F:2022-10-26 14:33:49.0,value_f:7.414417
id_f:1001000001,name_f:PUBLIC.SYS.PDB_OS_CPU_USAGE,INTERVAL_F:0,QUALITY_FGOOD,TIME_F:2022-10-26 14:33:50.0,value_f:3.1563241
Count: 10