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First/last trade

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This commit is contained in:
Kevin Cotugno 2017-09-08 07:35:47 -07:00
parent 67a5d3abc0
commit eb0c79942c
1 changed files with 30 additions and 0 deletions
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30
postgres/trade_service.go
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@ -17,6 +17,10 @@ const (
trades_in_date_range = `SELECT id, trade_id, product, price, size, buy, ` +
`sell, timestamp FROM trades WHERE product = $1 AND timestamp >= $2 ` +
`AND timestamp < $3;`
trade_first = `SELECT id, trade_id, product, price, size, buy, sell, timestamp ` +
`FROM trades WHERE product = $1 ORDER BY trade_id ASC LIMIT 1;`
trade_last = `SELECT id, trade_id, product, price, size, buy, sell, timestamp ` +
`FROM trades WHERE product = $1 ORDER BY trade_id DESC LIMIT 1;`
)
type TradeService struct {
@ -94,3 +98,29 @@ func (t *TradeService) TradesInDateRange(product string, start,
return trades, nil
}
func (t *TradeService) FirstTrade(product string) (*tacitus.Trade, error) {
var tr tacitus.Trade
row := t.client.db.QueryRow(trade_first, product)
if err := row.Scan(&tr.Id, &tr.TradeId, &tr.Product, &tr.Price, &tr.Size, &tr.Buy,
&tr.Sell, &tr.Timestamp); err != nil {
return nil, err
}
return &tr, nil
}
func (t *TradeService) LastTrade(product string) (*tacitus.Trade, error) {
var tr tacitus.Trade
row := t.client.db.QueryRow(trade_last, product)
if err := row.Scan(&tr.Id, &tr.TradeId, &tr.Product, &tr.Price, &tr.Size, &tr.Buy,
&tr.Sell, &tr.Timestamp); err != nil {
return nil, err
}
return &tr, nil
}