Awesome

GoFreeDB

Features

1. Provide a straightforward key-value and row based database interfaces on top of Google Sheets.
2. Serve your data without any server setup (by leveraging Google Sheets infrastructure).
3. Support flexible enough query language to perform various data queries.
4. Manually manipulate data via the familiar Google Sheets UI (no admin page required).

For more details, please read our analysis on other alternatives and how it compares with FreeDB.

Table of Contents

• Protocols
• Getting Started
  • Installation
  • Pre-requisites
• Row Store
  • Querying Rows
  • Counting Rows
  • Inserting Rows
  • Updating Rows
  • Deleting Rows
  • Struct Field to Column Mapping
• KV Store
  • Get Value
  • Set Key
  • Delete Key
  • Supported Modes

Protocols

Clients are strongly encouraged to read through the protocols document to see how things work under the hood and the limitations.

Getting Started

Installation

go get github.com/FreeLeh/GoFreeDB

Pre-requisites

1. Obtain a Google OAuth2 or Service Account credentials.
2. Prepare a Google Sheets spreadsheet where the data will be stored.

Row Store

Let's assume each row in the table is represented by the Person struct.

type Person struct {
	Name string `db:"name"`
	Age  int    `db:"age"`
}

Please read the struct field to column mapping section to understand the purpose of the db struct field tag.

import (
	"github.com/FreeLeh/GoFreeDB"
	"github.com/FreeLeh/GoFreeDB/google/auth"
)

// If using Google Service Account.
auth, err := auth.NewServiceFromFile(
	"<path_to_service_account_json>", 
	freedb.FreeDBGoogleAuthScopes, 
	auth.ServiceConfig{},
)

// If using Google OAuth2 Flow.
auth, err := auth.NewOAuth2FromFile(
	"<path_to_client_secret_json>", 
	"<path_to_cached_credentials_json>", 
	freedb.FreeDBGoogleAuthScopes, 
	auth.OAuth2Config{},
)

store := freedb.NewGoogleSheetsRowStore(
	auth, 
	"<spreadsheet_id>", 
	"<sheet_name>", 
	freedb.GoogleSheetRowStoreConfig{Columns: []string{"name", "age"}},
)
defer store.Close(context.Background())

Querying Rows

// Output variable
var output []Person

// Select all columns for all rows
err := store.
	Select(&output).
	Exec(context.Background())

// Select a few columns for all rows (non-selected struct fields will have default value)
err := store.
	Select(&output, "name").
	Exec(context.Background())

// Select rows with conditions
err := store.
	Select(&output).
	Where("name = ? OR age >= ?", "freedb", 10).
	Exec(context.Background())

// Select rows with sorting/order by
ordering := []freedb.ColumnOrderBy{
	{Column: "name", OrderBy: freedb.OrderByAsc},
	{Column: "age", OrderBy: freedb.OrderByDesc},
}
err := store.
	Select(&output).
	OrderBy(ordering).
	Exec(context.Background())

// Select rows with offset and limit
err := store.
	Select(&output).
	Offset(10).
	Limit(20).
	Exec(context.Background())

Counting Rows

// Count all rows
count, err := store.
	Count().
	Exec(context.Background())

// Count rows with conditions
count, err := store.
	Count().
	Where("name = ? OR age >= ?", "freedb", 10).
	Exec(context.Background())

Inserting Rows

err := store.Insert(
	Person{Name: "no_pointer", Age: 10}, 
	&Person{Name: "with_pointer", Age: 20},
).Exec(context.Background())

Updating Rows

colToUpdate := make(map[string]interface{})
colToUpdate["name"] = "new_name"
colToUpdate["age"] = 12

// Update all rows
err := store.
	Update(colToUpdate).
	Exec(context.Background())

// Update rows with conditions
err := store.
	Update(colToUpdate).
	Where("name = ? OR age >= ?", "freedb", 10).
	Exec(context.Background())

Deleting Rows

// Delete all rows
err := store.
	Delete().
	Exec(context.Background())

// Delete rows with conditions
err := store.
	Delete().
	Where("name = ? OR age >= ?", "freedb", 10).
	Exec(context.Background())

Struct Field to Column Mapping

The struct field tag db can be used for defining the mapping between the struct field and the column name. This works just like the json tag from encoding/json.

Without db tag, the library will use the field name directly (case-sensitive).

// This will map to the exact column name of "Name" and "Age".
type NoTagPerson struct {
	Name string
	Age  int
}

// This will map to the exact column name of "name" and "age" 
type WithTagPerson struct {
	Name string  `db:"name"`
	Age  int     `db:"age"`
}

KV Store

import (
	"github.com/FreeLeh/GoFreeDB"
	"github.com/FreeLeh/GoFreeDB/google/auth"
)

// If using Google Service Account.
auth, err := auth.NewServiceFromFile(
	"<path_to_service_account_json>", 
	freedb.FreeDBGoogleAuthScopes, 
	auth.ServiceConfig{},
)

// If using Google OAuth2 Flow.
auth, err := auth.NewOAuth2FromFile(
	"<path_to_client_secret_json>", 
	"<path_to_cached_credentials_json>", 
	freedb.FreeDBGoogleAuthScopes, 
	auth.OAuth2Config{},
)

kv := freedb.NewGoogleSheetKVStore(
	auth, 
	"<spreadsheet_id>", 
	"<sheet_name>", 
	freedb.GoogleSheetKVStoreConfig{Mode: freedb.KVSetModeAppendOnly},
)
defer kv.Close(context.Background())

Get Value

If the key is not found, freedb.ErrKeyNotFound will be returned.

value, err := kv.Get(context.Background(), "k1")

Set Key

err := kv.Set(context.Background(), "k1", []byte("some_value"))

Delete Key

err := kv.Delete(context.Background(), "k1")

Supported Modes

For more details on how the two modes are different, please read the protocol document.

There are 2 different modes supported:

1. Default mode.
2. Append only mode.

// Default mode
kv := freedb.NewGoogleSheetKVStore(
	auth,
	"<spreadsheet_id>",
	"<sheet_name>",
	freedb.GoogleSheetKVStoreConfig{Mode: freedb.KVModeDefault},
)

// Append only mode
kv := freedb.NewGoogleSheetKVStore(
	auth,
	"<spreadsheet_id>",
	"<sheet_name>",
	freedb.GoogleSheetKVStoreConfig{Mode: freedb.KVModeAppendOnly},
)

License

This project is MIT licensed.