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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" "errors"
"fmt" "fmt"
"strconv" "strconv"
"strings"
"github.com/jackc/pgx/v5/pgconn" "github.com/jackc/pgx/v5/pgconn"
) )
@ -52,22 +53,24 @@ func (txOptions TxOptions) beginSQL() string {
return "begin" return "begin"
} }
buf := make([]byte, 0, 64) // 64 - maximum length of string with available options var buf strings.Builder
buf = append(buf, "begin"...) buf.Grow(64) // 64 - maximum length of string with available options
buf.WriteString("begin")
if txOptions.IsoLevel != "" { if txOptions.IsoLevel != "" {
buf = append(buf, " isolation level "...) buf.WriteString(" isolation level ")
buf = append(buf, txOptions.IsoLevel...) buf.WriteString(string(txOptions.IsoLevel))
} }
if txOptions.AccessMode != "" { if txOptions.AccessMode != "" {
buf = append(buf, ' ') buf.WriteByte(' ')
buf = append(buf, txOptions.AccessMode...) buf.WriteString(string(txOptions.AccessMode))
} }
if txOptions.DeferrableMode != "" { if txOptions.DeferrableMode != "" {
buf = append(buf, ' ') buf.WriteByte(' ')
buf = append(buf, txOptions.DeferrableMode...) buf.WriteString(string(txOptions.DeferrableMode))
} }
return string(buf) return buf.String()
} }
var ErrTxClosed = errors.New("tx is closed") var ErrTxClosed = errors.New("tx is closed")