forked from MTSR/mapserver
72 lines
1.3 KiB
Go
72 lines
1.3 KiB
Go
package sqlite
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import (
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_ "github.com/mattn/go-sqlite3"
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"mapserver/coords"
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"mapserver/db"
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"mapserver/settings"
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"mapserver/layer"
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)
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const (
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SETTING_LAST_POS = "last_pos"
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)
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const getLastBlockQuery = `
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select pos,data,mtime
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from blocks b
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where b.mtime = 0
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and b.pos > ?
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order by b.pos asc, b.mtime asc
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limit ?
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`
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func (this *Sqlite3Accessor) FindNextInitialBlocks(s settings.Settings, layers []*layer.Layer, limit int) (*db.InitialBlocksResult, error) {
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result := &db.InitialBlocksResult{}
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blocks := make([]*db.Block, 0)
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lastpos := s.GetInt64(SETTING_LAST_POS, coords.MinPlainCoord-1)
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rows, err := this.db.Query(getLastBlockQuery, lastpos, limit)
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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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for rows.Next() {
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result.HasMore = true
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result.UnfilteredCount++
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var pos int64
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var data []byte
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var mtime int64
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err = rows.Scan(&pos, &data, &mtime)
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if err != nil {
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return nil, err
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}
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mb := convertRows(pos, data, mtime)
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// new position
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lastpos = pos
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blockcoordy := mb.Pos.Y * 16
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currentlayer := layer.FindLayerByY(layers, blockcoordy)
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if currentlayer != nil {
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blocks = append(blocks, mb)
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}
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}
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result.List = blocks
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//Save current positions of initial run
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s.SetInt64(SETTING_LAST_POS, lastpos)
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return result, nil
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}
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