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sqlsmith.go
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sqlsmith.go
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package sqlsmith
import (
"math/rand"
"time"
"github.com/juju/errors"
"github.com/pingcap/parser/ast"
"github.com/you06/sqlsmith-go/stateflow"
"github.com/you06/sqlsmith-go/types"
"github.com/you06/sqlsmith-go/util"
// _ "github.com/pingcap/tidb/types/parser_driver"
)
// SQLSmith defines SQLSmith struct
type SQLSmith struct {
depth int
maxDepth int
Rand *rand.Rand
Databases map[string]*types.Database
subTableIndex int
Node ast.Node
currDB string
debug bool
stable bool
}
// New create SQLSmith instance
func New() *SQLSmith {
return &SQLSmith{
Rand: rand.New(rand.NewSource(time.Now().UnixNano())),
Databases: make(map[string]*types.Database),
}
}
// Debug turn on debug mode
func (s *SQLSmith) Debug() {
s.debug = true
}
// SetDB set current database
func (s *SQLSmith) SetDB(db string) {
s.currDB = db
}
// GetCurrDBName returns current selected dbname
func (s *SQLSmith) GetCurrDBName() string {
return s.currDB
}
// GetDB get current database without nil
func (s *SQLSmith) GetDB(db string) *types.Database {
if db, ok := s.Databases[db]; ok {
return db
}
return &types.Database{
Name: db,
}
}
// Stable set generated SQLs no rand
func (s *SQLSmith) Stable() {
s.stable = true
}
// SetStable set stable to given value
func (s *SQLSmith) SetStable(stable bool) {
s.stable = stable
}
// Walk will walk the tree and fillin tables and columns data
func (s *SQLSmith) Walk(tree ast.Node) (string, error) {
node := stateflow.New(s.GetDB(s.currDB), s.stable).WalkTree(tree)
s.debugPrintf("node AST %+v\n", node)
sql, err := util.BufferOut(node)
// if sql ==
return sql, errors.Trace(err)
}