bbgo_origin/pkg/migrations/sqlite3/20200819054742_trade_index.go

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package sqlite3
import (
"context"
"github.com/c9s/rockhopper"
)
func init() {
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AddMigration(upTradeIndex, downTradeIndex)
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}
func upTradeIndex(ctx context.Context, tx rockhopper.SQLExecutor) (err error) {
// This code is executed when the migration is applied.
_, err = tx.ExecContext(ctx, "CREATE INDEX trades_symbol ON trades(symbol);")
if err != nil {
return err
}
_, err = tx.ExecContext(ctx, "CREATE INDEX trades_symbol_fee_currency ON trades(symbol, fee_currency, traded_at);")
if err != nil {
return err
}
_, err = tx.ExecContext(ctx, "CREATE INDEX trades_traded_at_symbol ON trades(traded_at, symbol);")
if err != nil {
return err
}
return err
}
func downTradeIndex(ctx context.Context, tx rockhopper.SQLExecutor) (err error) {
// This code is executed when the migration is rolled back.
_, err = tx.ExecContext(ctx, "DROP INDEX trades_symbol;")
if err != nil {
return err
}
_, err = tx.ExecContext(ctx, "DROP INDEX trades_symbol_fee_currency;")
if err != nil {
return err
}
_, err = tx.ExecContext(ctx, "DROP INDEX trades_traded_at_symbol;")
if err != nil {
return err
}
return err
}