{"id":13693891,"url":"https://github.com/mattn/go-nulltype","last_synced_at":"2025-04-14T00:42:12.721Z","repository":{"id":50250153,"uuid":"167213228","full_name":"mattn/go-nulltype","owner":"mattn","description":"Null friendly 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source library","Go"],"sub_categories":["数据库","Database"],"readme":"# go-nulltype\n\n[![Build Status](https://travis-ci.org/mattn/go-nulltype.svg?branch=master)](https://travis-ci.org/mattn/go-nulltype)\n[![codecov](https://codecov.io/gh/mattn/go-nulltype/branch/master/graph/badge.svg)](https://codecov.io/gh/mattn/go-nulltype)\n\nNullable types friendly to json.Encoder, json.Decoder, database/sql, fmt.Stringer, text/template, html/template, some of ORMs.\n\nSupported types:\n\n* NullBool\n* NullString\n* NullFloat64\n* NullInt64\n* NullTime\n\n## Usage\n\n```go\nimport \"github.com/mattn/go-nulltype\"\n\ntype User struct {\n\tName\tnulltype.NullString `json:\"name\"`\n}\n```\n\n### friendly to Stringer\n\n```go\nvar user User\nfmt.Println(user.Name.Valid()) // false\nfmt.Println(user.Name) // \"\"\n\nuser.Name.Set(\"Bob\")\nfmt.Println(user.Name.Valid()) // true\nfmt.Println(user.Name) // \"Bob\"\n\nfmt.Println(user.Name.StringValue() == \"Bob\") // true\n\nuser.Name.Reset()\nfmt.Println(user.Name.Valid()) // false\nfmt.Println(user.Name) // \"\"\n```\n\n### friendly to json.MarshalJSON\n\n```go\nvar user User\nfmt.Println(user.Name.Valid()) // false\njson.NewEncoder(os.Stdout).Encode(user) // {\"name\": null}\n\nuser.Name.Set(\"Bob\")\nfmt.Println(user.Name.Valid()) // true\njson.NewEncoder(os.Stdout).Encode(user) // {\"name\": \"Bob\"}\n```\n\n### friendly to json.UnmarshalJSON\n\n```go\nvar user User\ns := `{\"name\": \"Bob\"}`\njson.NewDecoder(strings.NewReader(s)).Decode(\u0026user)\nfmt.Println(user.Name.Valid()) // true\nfmt.Println(user.Name) // \"Bob\"\n\ns = `{\"name\": null}`\njson.NewDecoder(strings.NewReader(s)).Decode(\u0026user)\nfmt.Println(user.Name.Valid()) // false\nfmt.Println(user.Name) // \"\"\n```\n\n### friendly to database/sql\n\n```go\nvar user User\ndb.QueryRow(`SELECT name FROM users`).Scan(\u0026user.Name)\nfmt.Println(user.Name.Valid()) // true or false\nfmt.Println(user.Name) // \"Bob\" or \"\"\ndb.Exec(`INSERT INTO users(name) VALUES($1)`, user.Name)\n```\n\n### friendly to ORM\n\nStruct tag with [gorp](https://github.com/go-gorp/gorp).\n\n```go\ntype Post struct {\n\tId      int64 `db:\"post_id\"`\n\tCreated int64\n\tTitle   string              `db:\",size:50\"`\n\tBody    nulltype.NullString `db:\"body,size:1024\"`\n}\n```\n\n```go\np := Post{\n\tCreated: time.Now().UnixNano(),\n\tTitle:   title,\n\tBody:    nulltype.NullStringOf(body),\n}\nerr = dbmap.Insert(\u0026p)\n```\n\n## Installation\n\n```\ngo get github.com/mattn/go-nulltype\n```\n\n## License\n\nMIT\n\n## Author\n\nYasuhiro Matsumoto\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fmattn%2Fgo-nulltype","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fmattn%2Fgo-nulltype","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fmattn%2Fgo-nulltype/lists"}