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perf(tx): use strings.Builder to avoid the overhead of []byte -> string conversion

pull/1400/head
ksco 2022-11-25 14:08:57 +08:00 committed by Jack Christensen
parent fbfafb3edf
commit 8eb062f588
1 changed files with 12 additions and 9 deletions
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21
tx.go
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@ -5,6 +5,7 @@ import (
"errors"
"fmt"
"strconv"
"strings"
"github.com/jackc/pgx/v5/pgconn"
)
@ -52,22 +53,24 @@ func (txOptions TxOptions) beginSQL() string {
return "begin"
}
buf := make([]byte, 0, 64) // 64 - maximum length of string with available options
buf = append(buf, "begin"...)
var buf strings.Builder
buf.Grow(64) // 64 - maximum length of string with available options
buf.WriteString("begin")
if txOptions.IsoLevel != "" {
buf = append(buf, " isolation level "...)
buf = append(buf, txOptions.IsoLevel...)
buf.WriteString(" isolation level ")
buf.WriteString(string(txOptions.IsoLevel))
}
if txOptions.AccessMode != "" {
buf = append(buf, ' ')
buf = append(buf, txOptions.AccessMode...)
buf.WriteByte(' ')
buf.WriteString(string(txOptions.AccessMode))
}
if txOptions.DeferrableMode != "" {
buf = append(buf, ' ')
buf = append(buf, txOptions.DeferrableMode...)
buf.WriteByte(' ')
buf.WriteString(string(txOptions.DeferrableMode))
}
return string(buf)
return buf.String()
}
var ErrTxClosed = errors.New("tx is closed")