/
vtclient.go
189 lines (162 loc) · 4.35 KB
/
vtclient.go
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// Copyright 2012, Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"database/sql"
"encoding/json"
"flag"
"fmt"
"os"
"strings"
"time"
log "github.com/golang/glog"
"github.com/youtube/vitess/go/exit"
"github.com/youtube/vitess/go/vt/logutil"
// import the 'vitess' sql driver
_ "github.com/youtube/vitess/go/vt/client"
)
var (
usage = `
vtclient connects to a vtgate server using the standard go driver API.
Version 3 of the API is used, we do not send any hint to the server.
For query bound variables, we assume place-holders in the query string
in the form of :v1, :v2, etc.
`
server = flag.String("server", "", "vtgate server to connect to")
tabletType = flag.String("tablet_type", "rdonly", "tablet type to direct queries to")
timeout = flag.Duration("timeout", 30*time.Second, "timeout for queries")
streaming = flag.Bool("streaming", false, "use a streaming query")
bindVariables = newBindvars("bind_variables", "bind variables as a json list")
)
func init() {
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage of %s:\n", os.Args[0])
flag.PrintDefaults()
fmt.Fprintf(os.Stderr, usage)
}
}
type bindvars []interface{}
func (bv *bindvars) String() string {
b, err := json.Marshal(bv)
if err != nil {
return err.Error()
}
return string(b)
}
func (bv *bindvars) Set(s string) (err error) {
err = json.Unmarshal([]byte(s), &bv)
if err != nil {
return err
}
// json reads all numbers as float64
// So, we just ditch floats for bindvars
for i, v := range *bv {
if f, ok := v.(float64); ok {
if f > 0 {
(*bv)[i] = uint64(f)
} else {
(*bv)[i] = int64(f)
}
}
}
return nil
}
// For internal flag compatibility
func (bv *bindvars) Get() interface{} {
return bv
}
func newBindvars(name, usage string) *bindvars {
var bv bindvars
flag.Var(&bv, name, usage)
return &bv
}
// FIXME(alainjobart) this is a cheap trick. Should probably use the
// query parser if we needed this to be 100% reliable.
func isDml(sql string) bool {
lower := strings.TrimSpace(strings.ToLower(sql))
return strings.HasPrefix(lower, "insert") || strings.HasPrefix(lower, "update") || strings.HasPrefix(lower, "delete")
}
func main() {
defer exit.Recover()
defer logutil.Flush()
flag.Parse()
args := flag.Args()
if len(args) == 0 {
flag.Usage()
exit.Return(1)
}
connStr := fmt.Sprintf(`{"address": "%s", "tablet_type": "%s", "streaming": %v, "timeout": %d}`, *server, *tabletType, *streaming, int64(30*(*timeout)))
db, err := sql.Open("vitess", connStr)
if err != nil {
log.Errorf("client error: %v", err)
exit.Return(1)
}
log.Infof("Sending the query...")
now := time.Now()
// handle dml
if isDml(args[0]) {
tx, err := db.Begin()
if err != nil {
log.Errorf("begin failed: %v", err)
exit.Return(1)
}
result, err := db.Exec(args[0], []interface{}(*bindVariables)...)
if err != nil {
log.Errorf("exec failed: %v", err)
exit.Return(1)
}
err = tx.Commit()
if err != nil {
log.Errorf("commit failed: %v", err)
exit.Return(1)
}
rowsAffected, err := result.RowsAffected()
lastInsertId, err := result.LastInsertId()
log.Infof("Total time: %v / Row affected: %v / Last Insert Id: %v", time.Now().Sub(now), rowsAffected, lastInsertId)
} else {
// launch the query
rows, err := db.Query(args[0], []interface{}(*bindVariables)...)
if err != nil {
log.Errorf("client error: %v", err)
exit.Return(1)
}
defer rows.Close()
// print the headers
cols, err := rows.Columns()
if err != nil {
log.Errorf("client error: %v", err)
exit.Return(1)
}
line := "Index"
for _, field := range cols {
line += "\t" + field
}
fmt.Printf("%s\n", line)
// get the rows
rowIndex := 0
for rows.Next() {
row := make([]interface{}, len(cols))
for i := range row {
var col string
row[i] = &col
}
if err := rows.Scan(row...); err != nil {
log.Errorf("client error: %v", err)
exit.Return(1)
}
// print the line
line := fmt.Sprintf("%d", rowIndex)
for _, value := range row {
line += fmt.Sprintf("\t%v", *(value.(*string)))
}
fmt.Printf("%s\n", line)
rowIndex++
}
if err := rows.Err(); err != nil {
log.Errorf("Error %v\n", err)
exit.Return(1)
}
log.Infof("Total time: %v / Row count: %v", time.Now().Sub(now), rowIndex)
}
}