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| <p align="center"> | ||
| <img src="https://raw.githubusercontent.com/yaacov/tree-search-language/master/img/search-248.png" alt="TSL Logo"> | ||
| </p> | ||
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| # Tree Search Language (TSL) Command Line Interface (CLI) Examples |
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| // Copyright 2018 Yaacov Zamir <kobi.zamir@gmail.com> | ||
| // and other contributors. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
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| // Package model for demo. | ||
| package model | ||
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| // BookSpecs for demo. | ||
| type BookSpecs struct { | ||
| Pages uint `bson:"pages,omitempty" json:"pages,omitempty"` | ||
| Rating uint `bson:"rating,omitempty" json:"rating,omitempty"` | ||
| } | ||
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| // Book for demo. | ||
| type Book struct { | ||
| Title string `bson:"title,omitempty" json:"title,omitempty"` | ||
| Author string `bson:"author,omitempty" json:"author,omitempty"` | ||
| Spec BookSpecs `bson:"spec,omitempty" json:"spec,omitempty"` | ||
| } | ||
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| // Books are the demo list of books. | ||
| var Books = []interface{}{ | ||
| Book{Title: "Book", Author: "Joe", Spec: BookSpecs{Pages: 100, Rating: 4}}, | ||
| Book{Title: "Other Book", Author: "Jane", Spec: BookSpecs{Pages: 200, Rating: 3}}, | ||
| Book{Title: "Some Book", Author: "Jane", Spec: BookSpecs{Pages: 50, Rating: 5}}, | ||
| Book{Title: "Some Other Book", Author: "Jane", Spec: BookSpecs{Pages: 50}}, | ||
| Book{Title: "Good Book", Author: "Joe", Spec: BookSpecs{Pages: 150, Rating: 4}}, | ||
| Book{Title: "Some Great Book", Author: "Jane", Spec: BookSpecs{Pages: 550, Rating: 2}}, | ||
| Book{Title: "Other Great Book", Author: "Jane", Spec: BookSpecs{Pages: 250}}, | ||
| Book{Title: "My Big Book", Author: "Joe", Spec: BookSpecs{Pages: 15, Rating: 5}}, | ||
| } |
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| // Copyright 2018 Yaacov Zamir <kobi.zamir@gmail.com> | ||
| // and other contributors. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
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| // Package main. | ||
| package main | ||
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| import ( | ||
| "context" | ||
| "encoding/json" | ||
| "flag" | ||
| "fmt" | ||
| "log" | ||
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| "github.com/yaacov/tree-search-language/v5/pkg/tsl" | ||
| "github.com/yaacov/tree-search-language/v5/pkg/walkers/ident" | ||
| "github.com/yaacov/tree-search-language/v5/pkg/walkers/sql" | ||
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| "github.com/yaacov/tree-search-language/v5/cmd/model" | ||
| ) | ||
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| func check(err error) { | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| } | ||
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| // columnNamesMap mapps between user namespace and the SQL column names. | ||
| var columnNamesMap = map[string]string{ | ||
| "title": "title", | ||
| "author": "author", | ||
| "spec.pages": "pages", | ||
| "spec.rating": "rating", | ||
| } | ||
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| // checkColumnName checks if a coulumn name is valid in user space replace it | ||
| // with the mapped column name and returns and error if not a valid name. | ||
| func checkColumnName(s string) (string, error) { | ||
| // Chekc for column name in map. | ||
| if v, ok := columnNamesMap[s]; ok { | ||
| return v, nil | ||
| } | ||
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| // If not found return string as is, and an error. | ||
| return s, fmt.Errorf("column \"%s\" not found", s) | ||
| } | ||
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| func main() { | ||
| // Setup the input. | ||
| inputPtr := flag.String("i", "title is not null", "the tsl string to parse (e.g. \"title = 'Book'\")") | ||
| preparePtr := flag.Bool("p", false, "prepare a book collection for queries") | ||
| filePtr := flag.String("f", "./sqlite.db", "the sqlite database file name") | ||
| flag.Parse() | ||
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| // Set context. | ||
| ctx := context.Background() | ||
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| // Try to connect to sqlite driver. | ||
| tx, err := connect(ctx, *filePtr) | ||
| check(err) | ||
| defer tx.Commit() | ||
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| // Create a clean books collection. | ||
| if *preparePtr { | ||
| err = prepareCollection(tx) | ||
| check(err) | ||
| } | ||
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| // Parse input string into a TSL tree. | ||
| tree, err := tsl.ParseTSL(*inputPtr) | ||
| check(err) | ||
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| // Check and replace user identifiers with the SQL table column names. | ||
| tree, err = ident.Walk(tree, checkColumnName) | ||
| check(err) | ||
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| // Prepare SQL filter. | ||
| filter, err := sql.Walk(tree) | ||
| check(err) | ||
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| // Create SQL query. | ||
| sql, args, err := filter.ToSql() | ||
| check(err) | ||
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| // Query SQL table. | ||
| rows, err := tx.Model(&Book{}).Where(sql, args...).Select("*").Rows() | ||
| check(err) | ||
| defer rows.Close() | ||
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| for rows.Next() { | ||
| var elem Book | ||
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| // ScanRows scan a row into our gorm Book element. | ||
| err = tx.ScanRows(rows, &elem) | ||
| check(err) | ||
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| // Conver gorm Book type to model Book type. | ||
| book := model.Book{ | ||
| Title: elem.Title, | ||
| Author: elem.Author, | ||
| Spec: model.BookSpecs{ | ||
| Pages: elem.Pages, | ||
| Rating: elem.Rating, | ||
| }, | ||
| } | ||
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| // Print out one Book in json format. | ||
| b, _ := json.Marshal(book) | ||
| fmt.Printf("%s\n", string(b)) | ||
| } | ||
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| // Check for errors and exit. | ||
| err = rows.Err() | ||
| check(err) | ||
| } |
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