/
tideot.go
265 lines (216 loc) · 6.91 KB
/
tideot.go
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package main
import (
"encoding/json"
"fmt"
"github.com/HouzuoGuo/tiedot/db"
"github.com/HouzuoGuo/tiedot/dberr"
"github.com/fatih/structs"
"github.com/nu7hatch/gouuid"
"os"
"time"
)
/*
In embedded usage, you are encouraged to use all public functions concurrently.
However please do not use public functions in "data" package by yourself - you most likely will not need to use them directly.
To compile and run the example:
go build && ./tiedot -mode=example
It may require as much as 1.5GB of free disk space in order to run the example.
*/
type Command struct {
Id string `structs:"command_id"`
Name string `structs:"command_name"`
Started time.Time `structs:"command_started,omitnested"`
}
func AsJson(o interface{}) string {
b, err := json.Marshal(o)
if err != nil {
return "{}"
}
return string(b)
}
func PersistentSample1() {
myDBDir := "/Users/gianluca/Projects/golang/src/github.com/gi4nks/mosto/tmp/MyDatabase"
os.RemoveAll(myDBDir)
defer os.RemoveAll(myDBDir)
// (Create if not exist) open a database
myDB, err := db.OpenDB(myDBDir)
if err != nil {
panic(err)
}
// Create two collections: Commands and Votes
if err := myDB.Create("Commands"); err != nil {
tracer.Warning(err.Error())
}
// What collections do I now have?
for _, name := range myDB.AllCols() {
fmt.Printf("I have a collection called %s\n", name)
}
// ****************** Document Management ******************
// Start using a collection (the reference is valid until DB schema changes or Scrub is carried out)
commands := myDB.Use("Commands")
u4, err := uuid.NewV4()
if err != nil {
fmt.Println("error:", err)
return
}
tracer.News("1 - " + u4.String())
cmd1 := Command{Id: u4.String(), Name: "cmd1", Started: time.Now()}
u4, err = uuid.NewV4()
if err != nil {
fmt.Println("error:", err)
return
}
tracer.News("2 - " + u4.String())
cmd2 := Command{Id: u4.String(), Name: "cmd2", Started: time.Now()}
tracer.News(AsJson(cmd1))
tracer.News(AsJson(cmd2))
// Insert document (afterwards the docID uniquely identifies the document and will never change)
docID, err := commands.Insert(structs.Map(cmd1))
if err != nil {
panic(err)
}
// Read document
readBack, err := commands.Read(docID)
if err != nil {
panic(err)
}
fmt.Println("Document", docID, "is", readBack)
// Insert document (afterwards the docID uniquely identifies the document and will never change)
docID, err = commands.Insert(structs.Map(cmd2))
if err != nil {
panic(err)
}
// Read document
readBack, err = commands.Read(docID)
if err != nil {
panic(err)
}
fmt.Println("Document", docID, "is", readBack)
// Process all documents (note that document order is undetermined)
commands.ForEachDoc(func(id int, docContent []byte) (willMoveOn bool) {
fmt.Println("Document", id, "is", string(docContent))
return true // move on to the next document OR
return false // do not move on to the next document
})
// Gracefully close database
if err := myDB.Close(); err != nil {
panic(err)
}
}
func EmbeddedExample() {
// ****************** Collection Management ******************
myDBDir := "/Users/gianluca/Projects/golang/src/github.com/gi4nks/mosto/tmp/MyDatabase"
os.RemoveAll(myDBDir)
defer os.RemoveAll(myDBDir)
// (Create if not exist) open a database
myDB, err := db.OpenDB(myDBDir)
if err != nil {
panic(err)
}
// Create two collections: Feeds and Votes
if err := myDB.Create("Feeds"); err != nil {
panic(err)
}
if err := myDB.Create("Votes"); err != nil {
panic(err)
}
// What collections do I now have?
for _, name := range myDB.AllCols() {
fmt.Printf("I have a collection called %s\n", name)
}
// Rename collection "Votes" to "Points"
if err := myDB.Rename("Votes", "Points"); err != nil {
panic(err)
}
// Drop (delete) collection "Points"
if err := myDB.Drop("Points"); err != nil {
panic(err)
}
// Scrub (repair and compact) "Feeds"
if err := myDB.Scrub("Feeds"); err != nil {
panic(err)
}
// ****************** Document Management ******************
// Start using a collection (the reference is valid until DB schema changes or Scrub is carried out)
feeds := myDB.Use("Feeds")
// Insert document (afterwards the docID uniquely identifies the document and will never change)
docID, err := feeds.Insert(map[string]interface{}{
"name": "Go 1.2 is released",
"url": "golang.org"})
if err != nil {
panic(err)
}
// Read document
readBack, err := feeds.Read(docID)
if err != nil {
panic(err)
}
fmt.Println("Document", docID, "is", readBack)
// Update document
err = feeds.Update(docID, map[string]interface{}{
"name": "Go is very popular",
"url": "google.com"})
if err != nil {
panic(err)
}
// Process all documents (note that document order is undetermined)
feeds.ForEachDoc(func(id int, docContent []byte) (willMoveOn bool) {
fmt.Println("Document", id, "is", string(docContent))
return true // move on to the next document OR
return false // do not move on to the next document
})
// Delete document
if err := feeds.Delete(docID); err != nil {
panic(err)
}
// More complicated error handing - identify the error Type.
// In this example, the error code tells that the document no longer exists.
if err := feeds.Delete(docID); dberr.Type(err) == dberr.ErrorNoDoc {
fmt.Println("The document was already deleted")
}
// ****************** Index Management ******************
// Indexes assist in many types of queries
// Create index (path leads to document JSON attribute)
if err := feeds.Index([]string{"author", "name", "first_name"}); err != nil {
panic(err)
}
if err := feeds.Index([]string{"Title"}); err != nil {
panic(err)
}
if err := feeds.Index([]string{"Source"}); err != nil {
panic(err)
}
// What indexes do I have on collection A?
for _, path := range feeds.AllIndexes() {
fmt.Printf("I have an index on path %v\n", path)
}
// Remove index
if err := feeds.Unindex([]string{"author", "name", "first_name"}); err != nil {
panic(err)
}
// ****************** Queries ******************
// Prepare some documents for the query
feeds.Insert(map[string]interface{}{"Title": "New Go release", "Source": "golang.org", "Age": 3})
feeds.Insert(map[string]interface{}{"Title": "Kitkat is here", "Source": "google.com", "Age": 2})
feeds.Insert(map[string]interface{}{"Title": "Good Slackware", "Source": "slackware.com", "Age": 1})
/*
var query interface{}
json.Unmarshal([]byte(`[{"eq": "New Go release", "in": ["Title"]}, {"eq": "slackware.com", "in": ["Source"]}]`), &query)
queryResult := make(map[int]struct{}) // query result (document IDs) goes into map keys
if err := db.EvalQuery(query, feeds, &queryResult); err != nil {
panic(err)
}
// Query result are document IDs
for id := range queryResult {
// To get query result document, simply read it
readBack, err := feeds.Read(id)
if err != nil {
panic(err)
}
readBack = nil
}*/
// Gracefully close database
if err := myDB.Close(); err != nil {
panic(err)
}
}