261 lines
8.1 KiB
Go
261 lines
8.1 KiB
Go
package database
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import (
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"database/sql"
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"log"
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"time"
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"weatherstation/pkg/types"
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)
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// GetOnlineDevicesCount 获取在线设备数量
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func GetOnlineDevicesCount(db *sql.DB) int {
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query := `
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SELECT COUNT(DISTINCT station_id)
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FROM rs485_weather_data
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WHERE timestamp > NOW() - INTERVAL '5 minutes'`
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var count int
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if err := db.QueryRow(query).Scan(&count); err != nil {
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return 0
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}
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return count
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}
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// GetStations 获取所有WH65LP站点列表
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func GetStations(db *sql.DB) ([]types.Station, error) {
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query := `
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SELECT DISTINCT s.station_id,
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COALESCE(s.password, '') as station_name,
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'WH65LP' as device_type,
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COALESCE(MAX(r.timestamp), '1970-01-01'::timestamp) as last_update,
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COALESCE(s.latitude, 0) as latitude,
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COALESCE(s.longitude, 0) as longitude,
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COALESCE(s.name, '') as name,
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COALESCE(s.location, '') as location
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FROM stations s
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LEFT JOIN rs485_weather_data r ON s.station_id = r.station_id
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WHERE s.station_id LIKE 'RS485-%'
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GROUP BY s.station_id, s.password, s.latitude, s.longitude, s.name, s.location
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ORDER BY s.station_id`
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rows, err := db.Query(query)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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var stations []types.Station
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for rows.Next() {
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var station types.Station
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var lastUpdate time.Time
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err := rows.Scan(
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&station.StationID,
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&station.StationName,
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&station.DeviceType,
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&lastUpdate,
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&station.Latitude,
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&station.Longitude,
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&station.Name,
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&station.Location,
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)
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if err != nil {
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continue
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}
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station.LastUpdate = lastUpdate.Format("2006-01-02 15:04:05")
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stations = append(stations, station)
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}
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return stations, nil
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}
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// GetWeatherData 获取指定站点的历史天气数据
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func GetWeatherData(db *sql.DB, stationID string, startTime, endTime time.Time, interval string) ([]types.WeatherPoint, error) {
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// 构建查询SQL（统一风向矢量平均，雨量为累计量的正增量求和）
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var query string
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var intervalStr string
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switch interval {
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case "10min":
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intervalStr = "10 minutes"
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case "30min":
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intervalStr = "30 minutes"
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default: // 1hour
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intervalStr = "1 hour"
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}
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query = buildWeatherDataQuery(intervalStr)
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rows, err := db.Query(query, intervalStr, stationID, startTime, endTime)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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var points []types.WeatherPoint
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for rows.Next() {
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var point types.WeatherPoint
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err := rows.Scan(
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&point.DateTime,
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&point.Temperature,
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&point.Humidity,
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&point.Pressure,
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&point.WindSpeed,
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&point.WindDir,
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&point.Rainfall,
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&point.Light,
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&point.UV,
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)
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if err != nil {
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continue
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}
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points = append(points, point)
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}
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return points, nil
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}
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// GetSeriesFrom10Min 基于10分钟聚合表返回 10m/30m/1h 数据（风向向量平均、降雨求和、加权平均）
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func GetSeriesFrom10Min(db *sql.DB, stationID string, startTime, endTime time.Time, interval string) ([]types.WeatherPoint, error) {
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log.Printf("查询数据: stationID=%s, start=%v, end=%v, interval=%s",
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stationID, startTime.Format("2006-01-02 15:04:05"), endTime.Format("2006-01-02 15:04:05"), interval)
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var query string
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switch interval {
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case "10min":
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query = `
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SELECT
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to_char(bucket_start, 'YYYY-MM-DD HH24:MI:SS') AS date_time,
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ROUND(temp_c_x100/100.0, 2) AS temperature,
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ROUND(humidity_pct::numeric, 2) AS humidity,
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ROUND(pressure_hpa_x100/100.0, 2) AS pressure,
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ROUND(wind_speed_ms_x1000/1000.0, 3) AS wind_speed,
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ROUND(wind_dir_deg::numeric, 2) AS wind_direction,
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ROUND(rain_10m_mm_x1000/1000.0, 3) AS rainfall,
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ROUND(solar_wm2_x100/100.0, 2) AS light,
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ROUND(uv_index::numeric, 2) AS uv
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FROM rs485_weather_10min
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WHERE station_id = $1 AND bucket_start >= $2 AND bucket_start <= $3
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ORDER BY bucket_start`
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case "30min":
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query = buildAggFrom10MinQuery("30 minutes")
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default: // 1hour
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query = buildAggFrom10MinQuery("1 hour")
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}
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// // 调试输出完整SQL
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// debugSQL := fmt.Sprintf("-- SQL for %s\n%s\n-- Params: stationID=%s, start=%v, end=%v",
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// interval, query, stationID, startTime, endTime)
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// log.Println(debugSQL)
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rows, err := db.Query(query, stationID, startTime, endTime)
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if err != nil {
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log.Printf("查询失败: %v", err)
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return nil, err
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}
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defer rows.Close()
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var points []types.WeatherPoint
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for rows.Next() {
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var p types.WeatherPoint
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if err := rows.Scan(&p.DateTime, &p.Temperature, &p.Humidity, &p.Pressure, &p.WindSpeed, &p.WindDir, &p.Rainfall, &p.Light, &p.UV); err != nil {
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continue
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}
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points = append(points, p)
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}
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return points, nil
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}
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// buildAggFrom10MinQuery 返回从10分钟表再聚合的SQL（interval 支持 '30 minutes' 或 '1 hour'）
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func buildAggFrom10MinQuery(interval string) string {
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return `
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WITH base AS (
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SELECT * FROM rs485_weather_10min
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WHERE station_id = $1 AND bucket_start >= $2 AND bucket_start <= $3
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), g AS (
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SELECT
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CASE '` + interval + `'
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WHEN '1 hour' THEN date_trunc('hour', bucket_start)
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WHEN '30 minutes' THEN
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date_trunc('hour', bucket_start) +
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CASE WHEN date_part('minute', bucket_start) >= 30
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THEN '30 minutes'::interval
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ELSE '0 minutes'::interval
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END
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END AS grp,
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SUM(temp_c_x100 * sample_count)::bigint AS w_temp,
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SUM(humidity_pct * sample_count)::bigint AS w_hum,
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SUM(pressure_hpa_x100 * sample_count)::bigint AS w_p,
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SUM(solar_wm2_x100 * sample_count)::bigint AS w_solar,
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SUM(uv_index * sample_count)::bigint AS w_uv,
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SUM(wind_speed_ms_x1000 * sample_count)::bigint AS w_ws,
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MAX(wind_gust_ms_x1000) AS gust_max,
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SUM(sin(radians(wind_dir_deg)) * sample_count)::double precision AS sin_sum,
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SUM(cos(radians(wind_dir_deg)) * sample_count)::double precision AS cos_sum,
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SUM(rain_10m_mm_x1000) AS rain_sum,
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SUM(sample_count) AS n_sum
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FROM base
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GROUP BY 1
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)
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SELECT
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to_char(grp, 'YYYY-MM-DD HH24:MI:SS') AS date_time,
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ROUND((w_temp/NULLIF(n_sum,0))/100.0, 2) AS temperature,
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ROUND((w_hum/NULLIF(n_sum,0))::numeric, 2) AS humidity,
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ROUND((w_p/NULLIF(n_sum,0))/100.0, 2) AS pressure,
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ROUND((w_ws/NULLIF(n_sum,0))/1000.0, 3) AS wind_speed,
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ROUND((CASE WHEN degrees(atan2(sin_sum, cos_sum)) < 0
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THEN degrees(atan2(sin_sum, cos_sum)) + 360
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ELSE degrees(atan2(sin_sum, cos_sum)) END)::numeric, 2) AS wind_direction,
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ROUND((rain_sum/1000.0)::numeric, 3) AS rainfall,
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ROUND((w_solar/NULLIF(n_sum,0))/100.0, 2) AS light,
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ROUND((w_uv/NULLIF(n_sum,0))::numeric, 2) AS uv
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FROM g
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ORDER BY grp`
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}
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// buildWeatherDataQuery 构建天气数据查询SQL
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func buildWeatherDataQuery(interval string) string {
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return `
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WITH base AS (
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SELECT
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date_trunc('hour', timestamp) +
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(floor(date_part('minute', timestamp) / extract(epoch from $1::interval) * 60) * $1::interval) as time_group,
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timestamp as ts,
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temperature, humidity, pressure, wind_speed, wind_direction, rainfall, light, uv
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FROM rs485_weather_data
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WHERE station_id = $2 AND timestamp BETWEEN $3 AND $4
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),
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rain_inc AS (
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SELECT time_group, GREATEST(rainfall - LAG(rainfall) OVER (PARTITION BY time_group ORDER BY ts), 0) AS inc
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FROM base
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),
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rain_sum AS (
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SELECT time_group, SUM(inc) AS rainfall
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FROM rain_inc
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GROUP BY time_group
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),
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grouped_data AS (
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SELECT
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time_group,
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AVG(temperature) as temperature,
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AVG(humidity) as humidity,
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AVG(pressure) as pressure,
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AVG(wind_speed) as wind_speed,
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DEGREES(ATAN2(AVG(SIN(RADIANS(wind_direction))), AVG(COS(RADIANS(wind_direction))))) AS wind_direction_raw,
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AVG(light) as light,
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AVG(uv) as uv
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FROM base
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GROUP BY time_group
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)
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SELECT
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to_char(g.time_group, 'YYYY-MM-DD HH24:MI:SS') as date_time,
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ROUND(g.temperature::numeric, 2) as temperature,
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ROUND(g.humidity::numeric, 2) as humidity,
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ROUND(g.pressure::numeric, 2) as pressure,
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ROUND(g.wind_speed::numeric, 2) as wind_speed,
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ROUND((CASE WHEN g.wind_direction_raw < 0 THEN g.wind_direction_raw + 360 ELSE g.wind_direction_raw END)::numeric, 2) AS wind_direction,
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ROUND(COALESCE(r.rainfall, 0)::numeric, 3) as rainfall,
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ROUND(g.light::numeric, 2) as light,
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ROUND(g.uv::numeric, 2) as uv
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FROM grouped_data g
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LEFT JOIN rain_sum r ON r.time_group = g.time_group
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ORDER BY g.time_group`
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}
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