mirror of https://github.com/go-gorm/gorm.git
Scan Rows into struct, fix #59
This commit is contained in:
Jinzhu
parent
a7097106b1
commit
6546ec3b5e
157
README.md
157
README.md
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@ -68,15 +68,15 @@ go get -u github.com/jinzhu/gorm
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- [Limit](#limit)
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- [Offset](#offset)
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- [Count](#count)
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- [Pluck](#pluck)
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- [Raw SQL](#raw-sql)
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- [Row & Rows](#row--rows)
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- [Scan](#scan)
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- [Group & Having](#group--having)
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- [Joins](#joins)
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- [Transactions](#transactions)
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- [Scopes](#scopes)
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- [Callbacks](#callbacks)
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- [Pluck](#pluck)
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- [Scan](#scan)
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- [Raw SQL](#raw-sql)
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- [Row & Rows](#row--rows)
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- [Specifying The Table Name](#specifying-the-table-name)
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- [Error Handling](#error-handling)
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- [Logger](#logger)
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@ -866,73 +866,6 @@ db.Table("deleted_users").Count(&count)
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//// SELECT count(*) FROM deleted_users;
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```
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## Pluck
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Get selected attributes as map
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```go
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var ages []int64
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db.Find(&users).Pluck("age", &ages)
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var names []string
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db.Model(&User{}).Pluck("name", &names)
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db.Table("deleted_users").Pluck("name", &names)
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// Requesting more than one column? Do it like this:
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db.Select("name, age").Find(&users)
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```
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## Raw SQL
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```go
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db.Exec("DROP TABLE users;")
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db.Exec("UPDATE orders SET shipped_at=? WHERE id IN (?)", time.Now, []int64{11,22,33})
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```
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## Row & Rows
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It is even possible to get query result as `*sql.Row` or `*sql.Rows`
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```go
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row := db.Table("users").Where("name = ?", "jinzhu").Select("name, age").Row() // (*sql.Row)
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row.Scan(&name, &age)
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rows, err := db.Model(User{}).Where("name = ?", "jinzhu").Select("name, age, email").Rows() // (*sql.Rows, error)
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defer rows.Close()
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for rows.Next() {
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...
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rows.Scan(&name, &age, &email)
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...
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}
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// Raw SQL
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rows, err := db.Raw("select name, age, email from users where name = ?", "jinzhu").Rows() // (*sql.Rows, error)
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defer rows.Close()
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for rows.Next() {
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...
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rows.Scan(&name, &age, &email)
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...
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}
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```
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## Scan
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Scan results into another struct.
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```go
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type Result struct {
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Name string
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Age int
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}
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var result Result
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db.Table("users").Select("name, age").Where("name = ?", 3).Scan(&result)
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// Raw SQL
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db.Raw("SELECT name, age FROM users WHERE name = ?", 3).Scan(&result)
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```
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## Group & Having
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```go
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@ -1108,7 +1041,7 @@ func (u *User) AfterCreate() (err error) {
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}
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```
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Save/delete operations in gorm are running in a transaction.
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Save/delete operations in gorm are running in a transaction.
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Changes made in that transaction are not visible unless it is commited.
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So if you want to use those changes in your callbacks, you need to run your SQL in the same transaction.
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For this Gorm supports passing transactions to callbacks like this:
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@ -1120,6 +1053,86 @@ func (u *User) AfterCreate(tx *gorm.DB) (err error) {
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}
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```
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## Pluck
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Get selected attributes as map
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```go
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var ages []int64
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db.Find(&users).Pluck("age", &ages)
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var names []string
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db.Model(&User{}).Pluck("name", &names)
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db.Table("deleted_users").Pluck("name", &names)
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// Requesting more than one column? Do it like this:
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db.Select("name, age").Find(&users)
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```
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## Scan
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Scan results into another struct.
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```go
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type Result struct {
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Name string
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Age int
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}
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var result Result
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db.Table("users").Select("name, age").Where("name = ?", 3).Scan(&result)
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// Raw SQL
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db.Raw("SELECT name, age FROM users WHERE name = ?", 3).Scan(&result)
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```
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## Raw SQL
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```go
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db.Exec("DROP TABLE users;")
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db.Exec("UPDATE orders SET shipped_at=? WHERE id IN (?)", time.Now, []int64{11,22,33})
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```
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## Row & Rows
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It is even possible to get query result as `*sql.Row` or `*sql.Rows`
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```go
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row := db.Table("users").Where("name = ?", "jinzhu").Select("name, age").Row() // (*sql.Row)
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row.Scan(&name, &age)
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rows, err := db.Model(&User{}).Where("name = ?", "jinzhu").Select("name, age, email").Rows() // (*sql.Rows, error)
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defer rows.Close()
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for rows.Next() {
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...
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rows.Scan(&name, &age, &email)
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...
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}
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// Raw SQL
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rows, err := db.Raw("select name, age, email from users where name = ?", "jinzhu").Rows() // (*sql.Rows, error)
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defer rows.Close()
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for rows.Next() {
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...
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rows.Scan(&name, &age, &email)
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...
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}
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```
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### Scan Rows
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```go
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rows, err := db.Model(&User{}).Where("name = ?", "jinzhu").Select("name, age, email").Rows() // (*sql.Rows, error)
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defer rows.Close()
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for rows.Next() {
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var user User
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db.ScanRows(rows, &user)
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// do something
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}
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```
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## Specifying The Table Name
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```go
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14
main.go
14
main.go
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@ -224,6 +224,20 @@ func (s *DB) Rows() (*sql.Rows, error) {
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return s.NewScope(s.Value).rows()
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}
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func (s *DB) ScanRows(rows *sql.Rows, value interface{}) error {
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var (
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clone = s.clone()
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scope = clone.NewScope(value)
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columns, err = rows.Columns()
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)
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if clone.AddError(err) == nil {
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scope.scan(rows, columns, scope.Fields())
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}
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return clone.Error
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}
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func (s *DB) Pluck(column string, value interface{}) *DB {
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return s.NewScope(s.Value).pluck(column, value).db
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}
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36
main_test.go
36
main_test.go
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@ -4,6 +4,7 @@ import (
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"database/sql"
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"database/sql/driver"
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"fmt"
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"reflect"
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"strconv"
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_ "github.com/denisenkom/go-mssqldb"
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@ -376,7 +377,7 @@ func TestRows(t *testing.T) {
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rows, err := DB.Table("users").Where("name = ? or name = ?", user2.Name, user3.Name).Select("name, age").Rows()
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if err != nil {
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t.Errorf("Not error should happen, but got")
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t.Errorf("Not error should happen, got %v", err)
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}
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count := 0
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@ -386,8 +387,39 @@ func TestRows(t *testing.T) {
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rows.Scan(&name, &age)
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count++
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}
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if count != 2 {
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t.Errorf("Should found two records with name 3")
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t.Errorf("Should found two records")
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}
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}
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func TestScanRows(t *testing.T) {
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user1 := User{Name: "ScanRowsUser1", Age: 1, Birthday: now.MustParse("2000-1-1")}
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user2 := User{Name: "ScanRowsUser2", Age: 10, Birthday: now.MustParse("2010-1-1")}
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user3 := User{Name: "ScanRowsUser3", Age: 20, Birthday: now.MustParse("2020-1-1")}
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DB.Save(&user1).Save(&user2).Save(&user3)
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rows, err := DB.Table("users").Where("name = ? or name = ?", user2.Name, user3.Name).Select("name, age").Rows()
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if err != nil {
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t.Errorf("Not error should happen, got %v", err)
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}
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type Result struct {
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Name string
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Age int
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}
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var results []Result
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for rows.Next() {
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var result Result
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if err := DB.ScanRows(rows, &result); err != nil {
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t.Errorf("should get no error, but got %v", err)
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}
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results = append(results, result)
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}
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if !reflect.DeepEqual(results, []Result{{Name: "ScanRowsUser2", Age: 10}, {Name: "ScanRowsUser3", Age: 20}}) {
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t.Errorf("Should find expected results")
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}
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}
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128
utils.go
128
utils.go
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@ -2,8 +2,11 @@ package gorm
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import (
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"bytes"
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"database/sql/driver"
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"fmt"
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"reflect"
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"regexp"
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"runtime"
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"strings"
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"sync"
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)
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@ -50,6 +53,7 @@ const (
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upper strCase = true
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)
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// ToDBName convert string to db name
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func ToDBName(name string) string {
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if v := smap.Get(name); v != "" {
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return v
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@ -94,11 +98,14 @@ func ToDBName(name string) string {
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return s
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}
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// SQL expression
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type expr struct {
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expr string
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args []interface{}
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}
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// Expr generate raw SQL expression for SQL, for example:
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// DB.Model(&product).Update("price", gorm.Expr("price * ? + ?", 2, 100))
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func Expr(expression string, args ...interface{}) *expr {
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return &expr{expr: expression, args: args}
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}
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@ -148,3 +155,124 @@ func toQueryValues(values [][]interface{}) (results []interface{}) {
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}
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return
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}
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func fileWithLineNum() string {
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for i := 2; i < 15; i++ {
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_, file, line, ok := runtime.Caller(i)
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if ok && (!regexp.MustCompile(`jinzhu/gorm/.*.go`).MatchString(file) || regexp.MustCompile(`jinzhu/gorm/.*test.go`).MatchString(file)) {
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return fmt.Sprintf("%v:%v", file, line)
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}
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}
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return ""
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}
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func isBlank(value reflect.Value) bool {
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return reflect.DeepEqual(value.Interface(), reflect.Zero(value.Type()).Interface())
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}
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func toSearchableMap(attrs ...interface{}) (result interface{}) {
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if len(attrs) > 1 {
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if str, ok := attrs[0].(string); ok {
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result = map[string]interface{}{str: attrs[1]}
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}
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} else if len(attrs) == 1 {
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if attr, ok := attrs[0].(map[string]interface{}); ok {
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result = attr
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}
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if attr, ok := attrs[0].(interface{}); ok {
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result = attr
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}
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}
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return
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}
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func convertInterfaceToMap(values interface{}) map[string]interface{} {
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attrs := map[string]interface{}{}
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switch value := values.(type) {
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case map[string]interface{}:
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for k, v := range value {
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attrs[k] = v
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}
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case []interface{}:
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for _, v := range value {
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for key, value := range convertInterfaceToMap(v) {
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attrs[key] = value
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}
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}
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case interface{}:
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reflectValue := reflect.ValueOf(values)
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switch reflectValue.Kind() {
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case reflect.Map:
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for _, key := range reflectValue.MapKeys() {
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attrs[ToDBName(key.Interface().(string))] = reflectValue.MapIndex(key).Interface()
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}
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default:
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for _, field := range (&Scope{Value: values}).Fields() {
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if !field.IsBlank && !field.IsIgnored {
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attrs[field.DBName] = field.Field.Interface()
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}
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}
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}
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}
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return attrs
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}
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func equalAsString(a interface{}, b interface{}) bool {
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return toString(a) == toString(b)
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}
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func toString(str interface{}) string {
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if values, ok := str.([]interface{}); ok {
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var results []string
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for _, value := range values {
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results = append(results, toString(value))
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}
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return strings.Join(results, "_")
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} else if bytes, ok := str.([]byte); ok {
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return string(bytes)
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} else if reflectValue := reflect.Indirect(reflect.ValueOf(str)); reflectValue.IsValid() {
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return fmt.Sprintf("%v", reflectValue.Interface())
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}
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return ""
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}
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func makeSlice(elemType reflect.Type) interface{} {
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if elemType.Kind() == reflect.Slice {
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elemType = elemType.Elem()
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}
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sliceType := reflect.SliceOf(elemType)
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slice := reflect.New(sliceType)
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slice.Elem().Set(reflect.MakeSlice(sliceType, 0, 0))
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return slice.Interface()
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}
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func strInSlice(a string, list []string) bool {
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for _, b := range list {
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if b == a {
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return true
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}
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}
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return false
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}
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// getValueFromFields return given fields's value
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func getValueFromFields(value reflect.Value, fieldNames []string) (results []interface{}) {
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// If value is a nil pointer, Indirect returns a zero Value!
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// Therefor we need to check for a zero value,
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// as FieldByName could panic
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if indirectValue := reflect.Indirect(value); indirectValue.IsValid() {
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for _, fieldName := range fieldNames {
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if fieldValue := indirectValue.FieldByName(fieldName); fieldValue.IsValid() {
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result := fieldValue.Interface()
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if r, ok := result.(driver.Valuer); ok {
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result, _ = r.Value()
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}
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results = append(results, result)
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}
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}
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}
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return
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}
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131
utils_private.go
131
utils_private.go
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@ -1,131 +0,0 @@
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package gorm
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import (
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"database/sql/driver"
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"fmt"
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"reflect"
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"regexp"
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"runtime"
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"strings"
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)
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func fileWithLineNum() string {
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for i := 2; i < 15; i++ {
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_, file, line, ok := runtime.Caller(i)
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if ok && (!regexp.MustCompile(`jinzhu/gorm/.*.go`).MatchString(file) || regexp.MustCompile(`jinzhu/gorm/.*test.go`).MatchString(file)) {
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return fmt.Sprintf("%v:%v", file, line)
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}
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}
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return ""
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}
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func isBlank(value reflect.Value) bool {
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return reflect.DeepEqual(value.Interface(), reflect.Zero(value.Type()).Interface())
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}
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func toSearchableMap(attrs ...interface{}) (result interface{}) {
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if len(attrs) > 1 {
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if str, ok := attrs[0].(string); ok {
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result = map[string]interface{}{str: attrs[1]}
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}
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} else if len(attrs) == 1 {
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if attr, ok := attrs[0].(map[string]interface{}); ok {
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result = attr
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}
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if attr, ok := attrs[0].(interface{}); ok {
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result = attr
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}
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}
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return
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}
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func convertInterfaceToMap(values interface{}) map[string]interface{} {
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attrs := map[string]interface{}{}
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switch value := values.(type) {
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case map[string]interface{}:
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for k, v := range value {
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attrs[k] = v
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}
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case []interface{}:
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for _, v := range value {
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for key, value := range convertInterfaceToMap(v) {
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attrs[key] = value
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}
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}
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case interface{}:
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reflectValue := reflect.ValueOf(values)
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switch reflectValue.Kind() {
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case reflect.Map:
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for _, key := range reflectValue.MapKeys() {
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attrs[ToDBName(key.Interface().(string))] = reflectValue.MapIndex(key).Interface()
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}
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default:
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for _, field := range (&Scope{Value: values}).Fields() {
|
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if !field.IsBlank && !field.IsIgnored {
|
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attrs[field.DBName] = field.Field.Interface()
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}
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}
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}
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}
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return attrs
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}
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|
||||
func equalAsString(a interface{}, b interface{}) bool {
|
||||
return toString(a) == toString(b)
|
||||
}
|
||||
|
||||
func toString(str interface{}) string {
|
||||
if values, ok := str.([]interface{}); ok {
|
||||
var results []string
|
||||
for _, value := range values {
|
||||
results = append(results, toString(value))
|
||||
}
|
||||
return strings.Join(results, "_")
|
||||
} else if bytes, ok := str.([]byte); ok {
|
||||
return string(bytes)
|
||||
} else if reflectValue := reflect.Indirect(reflect.ValueOf(str)); reflectValue.IsValid() {
|
||||
return fmt.Sprintf("%v", reflectValue.Interface())
|
||||
}
|
||||
return ""
|
||||
}
|
||||
|
||||
func makeSlice(elemType reflect.Type) interface{} {
|
||||
if elemType.Kind() == reflect.Slice {
|
||||
elemType = elemType.Elem()
|
||||
}
|
||||
sliceType := reflect.SliceOf(elemType)
|
||||
slice := reflect.New(sliceType)
|
||||
slice.Elem().Set(reflect.MakeSlice(sliceType, 0, 0))
|
||||
return slice.Interface()
|
||||
}
|
||||
|
||||
func strInSlice(a string, list []string) bool {
|
||||
for _, b := range list {
|
||||
if b == a {
|
||||
return true
|
||||
}
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
// getValueFromFields return given fields's value
|
||||
func getValueFromFields(value reflect.Value, fieldNames []string) (results []interface{}) {
|
||||
// If value is a nil pointer, Indirect returns a zero Value!
|
||||
// Therefor we need to check for a zero value,
|
||||
// as FieldByName could panic
|
||||
if indirectValue := reflect.Indirect(value); indirectValue.IsValid() {
|
||||
for _, fieldName := range fieldNames {
|
||||
if fieldValue := indirectValue.FieldByName(fieldName); fieldValue.IsValid() {
|
||||
result := fieldValue.Interface()
|
||||
if r, ok := result.(driver.Valuer); ok {
|
||||
result, _ = r.Value()
|
||||
}
|
||||
results = append(results, result)
|
||||
}
|
||||
}
|
||||
}
|
||||
return
|
||||
}
|
||||
Loading…
Reference in New Issue