Created
January 25, 2024 04:01
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| package main | |
| /* | |
| Prerequisites: | |
| go get -v github.com/pingcap/parser@3a18f1e | |
| go get -v github.com/pingcap/tidb/types/parser_driver@328b6d0 | |
| */ | |
| import ( | |
| "fmt" | |
| "github.com/pingcap/parser" | |
| "github.com/pingcap/parser/ast" | |
| _ "github.com/pingcap/tidb/types/parser_driver" | |
| ) | |
| const sqlSample = `select itemid, sum(sales) as sum_sales, count(userid) as pv, count(distinct userid) as uv | |
| from stat_mydata_shop_20211010 as table_metrics | |
| where dt>20211010 and dt <20211017 and shopid=123456 | |
| group by itemid | |
| order by sum_pv desc | |
| limit 10 offset 5` | |
| type visitor struct{} | |
| var _ ast.Visitor = (*visitor)(nil) | |
| func (v *visitor) Enter(in ast.Node) (out ast.Node, skipChildren bool) { | |
| fmt.Printf("%T\t%+v\n", in, in) | |
| return in, false | |
| } | |
| func (v *visitor) Leave(in ast.Node) (out ast.Node, ok bool) { return in, true } | |
| func main() { | |
| fmt.Printf("raw sql:\n%s\n\n", sqlSample) | |
| p := parser.New() | |
| stmtNodes, _, err := p.Parse(sqlSample, "", "") | |
| if err != nil { | |
| fmt.Printf("parse error: %v\n", err.Error()) | |
| panic(err) | |
| return | |
| } | |
| for _, stmtNode := range stmtNodes { | |
| v := visitor{} | |
| stmtNode.Accept(&v) | |
| } | |
| } |
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