Merge pull request #15 from knocknote/feature/add_show_parser

add show statement parser

Author: goccy

go.mod

@@ -10,7 +10,7 @@ require (
 	github.com/juju/errors v0.0.0-20170703010042-c7d06af17c68 // indirect
 	github.com/juju/loggo v0.0.0-20190212223446-d976af380377 // indirect
 	github.com/juju/testing v0.0.0-20190415054131-a282c42ba059 // indirect
-	github.com/knocknote/vitess-sqlparser v0.0.0-20181121014348-1003c43917a3
+	github.com/knocknote/vitess-sqlparser v0.0.0-20190712090058-385243f72d33
 	github.com/mattn/go-colorable v0.0.0-20160220075935-9cbef7c35391 // indirect
 	github.com/mattn/go-isatty v0.0.0-20151211000621-56b76bdf51f7 // indirect
 	github.com/mattn/go-sqlite3 v0.0.0-20170407154627-cf7286f069c3

go.sum

@@ -16,6 +16,8 @@ github.com/juju/testing v0.0.0-20190415054131-a282c42ba059 h1:vsqkD58dFysYgUZ8XH
 github.com/juju/testing v0.0.0-20190415054131-a282c42ba059/go.mod h1:63prj8cnj0tU0S9OHjGJn+b1h0ZghCndfnbQolrYTwA=
 github.com/knocknote/vitess-sqlparser v0.0.0-20181121014348-1003c43917a3 h1:Nk/bqRokAz+B4j+18CKyAYhkf/scbbY7anWdSZFHjqI=
 github.com/knocknote/vitess-sqlparser v0.0.0-20181121014348-1003c43917a3/go.mod h1:bF2oGXw2Ex/jIPGFPaFzEf8BtNRSBWc81ni+N9UaW5Q=
+github.com/knocknote/vitess-sqlparser v0.0.0-20190712090058-385243f72d33 h1:3//yyn1X4pIytNgAA3a1a7CQJm2w3WNVNCGLBQrPcPA=
+github.com/knocknote/vitess-sqlparser v0.0.0-20190712090058-385243f72d33/go.mod h1:bF2oGXw2Ex/jIPGFPaFzEf8BtNRSBWc81ni+N9UaW5Q=
 github.com/mattn/go-colorable v0.0.0-20160220075935-9cbef7c35391 h1:x4vT4RoTH2BNkPx0LgrBKeFuPQPviK1aSAIWG6ruc+Y=
 github.com/mattn/go-colorable v0.0.0-20160220075935-9cbef7c35391/go.mod h1:9vuHe8Xs5qXnSaW/c/ABM9alt+Vo+STaOChaDxuIBZU=
 github.com/mattn/go-isatty v0.0.0-20151211000621-56b76bdf51f7 h1:owMyzMR4QR+jSdlfkX9jPU3rsby4++j99BfbtgVr6ZY=

sqlparser/query.go

@@ -32,6 +32,9 @@ const (
 	CreateTable
 	// TruncateTable 'TRUNCATE TABLE' query type
 	TruncateTable
+	// Show 'SHOW' query type
+	Show
+
 )
 
 func (t QueryType) IsWriteQuery() bool {

sqlparser/sqlparser.go

@@ -382,6 +382,12 @@ func (p *Parser) parseDDLStmt(stmt *vtparser.DDL, queryBase *QueryBase) (Query,
 	return queryBase, nil
 }
 
+func (p *Parser) parseShowStmt(stmt *vtparser.Show, queryBase *QueryBase) (Query, error) {
+	queryBase.Type = Show
+	queryBase.TableName = stmt.TableName
+	return queryBase, nil
+}
+
 func (p *Parser) formatQuery(query string) string {
 	formattedQuery := replaceDoubleQuote.ReplaceAllString(query, "`")
 	formattedQuery = removeSemiColon.ReplaceAllString(formattedQuery, "")
@@ -445,6 +451,12 @@ func (p *Parser) Parse(queryText string, args ...interface{}) (Query, error) {
 			return nil, errors.WithStack(err)
 		}
 		return query, nil
+	case *vtparser.Show:
+		query, err := p.parseShowStmt(stmt, queryBase)
+		if err != nil {
+			return nil, errors.WithStack(err)
+		}
+		return query, nil
 	default:
 	}
 	return nil, errors.Errorf("unsupported query type %s", reflect.TypeOf(ast))

sqlparser/sqlparser_test.go

@@ -58,6 +58,22 @@ func TestDDL(t *testing.T) {
 	})
 }
 
+func TestSHOW(t *testing.T) {
+	parser, err := New()
+	checkErr(t, err)
+	t.Run("show create table", func(t *testing.T) {
+		query, err := parser.Parse("show create table users")
+		fmt.Printf("show.table:%v\n", query.Table())
+		checkErr(t, err)
+		if query.QueryType() != Show {
+			t.Fatal("cannot parse 'show' query")
+		}
+		if query.Table() != "users" {
+			t.Fatal("cannot parse 'show' query")
+		}
+	})
+}
+
 func validateSelectQuery(t *testing.T, query Query) {
 	if query.QueryType() != Select {
 		t.Fatal("cannot parse 'select' query")
@@ -542,7 +558,7 @@ func TestERROR(t *testing.T) {
 		log.Println(err)
 	})
 	t.Run("unsupport query", func(t *testing.T) {
-		query, err := parser.Parse("show create table users")
+		query, err := parser.Parse("show slave status")
 		if query != nil {
 			t.Fatal("invalid query value")
 		}