When I use the JSON type in MySQL，select data from JSON fields，Return prompt “Error 1815 (HY000): [9001, 2024071810515419216812725203453810909] Unsupported column type: 245“
CREATE TABLE t_jsons (
id bigint AUTO_INCREMENT,
tag json,
aaa varchar(255),
obj json,
PRIMARY KEY (id)
) ;
INSERT INTO t_jsons (id, tag, aaa, obj) VALUES (2, '[\"dd\",\"ccc\"]', 'adssd', '{\"name\":\"李四\"}');
INSERT INTO t_jsons (id, tag, aaa, obj) VALUES (1, '[\"aaa\",\"bbb\"]', 'ttt', '{\"name\":\"张三\"}');
package main
import ( "database/sql/driver" "encoding/json" "fmt" "gorm.io/driver/mysql" "gorm.io/gorm" )
type Tag []string
type User struct {
Name string
Tag Tag gorm:"type:string"
Obj string gorm:"type:string"
}
func (i Tag) Scan(value interface{}) error { v, _ := value.([]byte) var receiver Tag err := json.Unmarshal(v, &receiver) if err != nil { return err } i = receiver return nil }
func (i Tag) Value() (driver.Value, error) { return json.Marshal(i) }
func main() {
dsn := "root:password@tcp(ip:point)/db?charset=utf8mb4&parseTime=True&loc=Local"
db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{})
if err != nil {
panic(err)
}
var users []User
db.Table("t_jsons").Where(JSON_EXTRACT(obj, '$.name') = ?, "name").Debug().Scan(&users)
fmt.Printf("result: %+v", users)
}
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