Mercurial > gemma

annotate cmd/octree2contour/store.go @ 726:5af9ab39e715

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Renamed a few types to uppercase names to prepare the move to the octree package.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sat, 22 Sep 2018 21:34:12 +0200
parents c0bba602b60e
children 41c8dc61f38f
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a9783d8f74ed octree: Store contour lines into postgres/postgis.
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1 package main
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2
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3 import (
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4 "bytes"
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5 "database/sql"
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6 "encoding/binary"
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7 "math"
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8 )
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9
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10 const (
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11 wkbNDR byte = 1
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12 wkbPointZ uint32 = 1000 + 1
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13 wkbLineStringZ uint32 = 1000 + 2
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14 wkbMultiLineStringZ uint32 = 1000 + 5
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15 )
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16
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17 type result struct {
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18 h float64
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19 lines MultiLineStringZ
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20 }
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21
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22 const insertSQL = `
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23 INSERT INTO waterway.contour_lines (height, geom)
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24 VALUES ($1, ST_Transform(
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25 ST_SetSRID(ST_GeomFromWKB($2), $3), 4326)::geography)
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26 `
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27
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28 func store(all []result, epsg uint32) error {
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29
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30 return run(func(db *sql.DB) error {
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31
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32 tx, err := db.Begin()
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33 if err != nil {
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34 return err
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35 }
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36 defer tx.Rollback()
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37
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38 stmt, err := tx.Prepare(insertSQL)
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39 if err != nil {
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40 return err
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41 }
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42
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43 for _, r := range all {
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44 if _, err := stmt.Exec(r.h, r.lines.asWKB(), epsg); err != nil {
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45 return err
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46 }
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47 }
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48
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49 return tx.Commit()
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50 })
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51 }
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52
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53 func (mls MultiLineStringZ) asWKB() []byte {
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54
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55 var buf bytes.Buffer
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57 binary.Write(&buf, binary.LittleEndian, wkbNDR)
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58 binary.Write(&buf, binary.LittleEndian, wkbMultiLineStringZ)
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59 binary.Write(&buf, binary.LittleEndian, uint32(len(mls)))
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60
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61 for _, ml := range mls {
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62 binary.Write(&buf, binary.LittleEndian, wkbNDR)
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63 binary.Write(&buf, binary.LittleEndian, wkbLineStringZ)
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64 binary.Write(&buf, binary.LittleEndian, uint32(len(ml)))
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65 for _, p := range ml {
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66 binary.Write(&buf, binary.LittleEndian, math.Float64bits(p.x))
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67 binary.Write(&buf, binary.LittleEndian, math.Float64bits(p.y))
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68 binary.Write(&buf, binary.LittleEndian, math.Float64bits(p.z))
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69 }
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70 }
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71
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72 return buf.Bytes()
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73 }