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join.go
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join.go
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package sorm
import (
"fmt"
"reflect"
)
func (db *Database) Join(dest interface{}, model1 interface{}, model2 interface{}, joinCondition string) error {
rv := reflect.ValueOf(dest)
if rv.Kind() != reflect.Ptr || rv.Elem().Kind() != reflect.Slice {
return fmt.Errorf("dest must be a pointer to a slice")
}
sliceValue := rv.Elem()
elemType := sliceValue.Type().Elem()
tableName1 := reflect.TypeOf(model1).Name()
tableName2 := reflect.TypeOf(model2).Name()
query := fmt.Sprintf("SELECT * FROM %s JOIN %s ON %s;", tableName1, tableName2, joinCondition)
rows, err := db.Connection.Query(query)
if err != nil {
return err
}
defer rows.Close()
columns, err := rows.Columns()
if err != nil {
return err
}
for rows.Next() {
elemPtr := reflect.New(elemType)
elem := elemPtr.Elem()
fieldPtrs := make([]interface{}, len(columns))
for i := 0; i < len(columns); i++ {
fieldPtrs[i] = elem.Field(i).Addr().Interface()
}
if err := rows.Scan(fieldPtrs...); err != nil {
return err
}
sliceValue.Set(reflect.Append(sliceValue, elem))
}
return rows.Err()
}