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select.go
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select.go
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package chorm
import (
"context"
"fmt"
"reflect"
"github.com/0x19/go-clickhouse-orm/models"
"github.com/0x19/go-clickhouse-orm/sql"
"github.com/vahid-sohrabloo/chconn/v3"
"github.com/vahid-sohrabloo/chconn/v3/chpool"
"github.com/vahid-sohrabloo/chconn/v3/column"
)
type SelectBuilder[T models.Model] struct {
*sql.SelectBuilder
ctx context.Context
queryOptions *chconn.QueryOptions
orm *ORM
serverInfo *chconn.ServerInfo
}
func (s *SelectBuilder[T]) GetBuilder() *sql.SelectBuilder {
return s.SelectBuilder
}
func (s *SelectBuilder[T]) Build() (string, error) {
return s.SelectBuilder.Build()
}
func (s *SelectBuilder[T]) ExecContext(ctx context.Context, queryOptions *chconn.QueryOptions, columns ...column.ColumnBasic) error {
return s.orm.GetConn().InsertWithOption(ctx, s.SQL(), queryOptions, columns...)
}
func (s *SelectBuilder[T]) SQL() string {
return s.SelectBuilder.String()
}
func (s *SelectBuilder[T]) One(ctx context.Context, queryOptions *chconn.QueryOptions, record T) error {
if queryOptions != nil {
s.queryOptions = queryOptions
}
return nil
}
func (s *SelectBuilder[T]) Scan(ctx context.Context, queryOptions *chconn.QueryOptions) ([]T, error) {
var toReturn []T
stmt, err := s.orm.GetConn().SelectWithOption(ctx, s.SQL(), queryOptions, s.GetModel().GetDeclaration().GetPreparedColumns()...)
if err != nil {
return toReturn, err
}
defer stmt.Close()
for stmt.Next() {
elm := reflect.TypeOf((*T)(nil)).Elem()
record := reflect.New(elm.Elem()).Interface().(T)
if err := record.ScanRow(stmt); err != nil {
return toReturn, fmt.Errorf(
"error scanning row into model `%T`: %w",
elm.Name(),
err,
)
}
toReturn = append(toReturn, record)
}
if stmt.Err() != nil {
return toReturn, stmt.Err()
}
return toReturn, nil
}
func NewSelect[T models.Model](ctx context.Context, orm *ORM, queryOptions *chconn.QueryOptions) (*SelectBuilder[T], error) {
stmtBuilder := sql.NewSelectBuilder()
stmtBuilder.Database(orm.GetDatabaseName())
stmtBuilder.Select("*") // Initially select all... this can be overridden later.
tType := reflect.TypeOf((*T)(nil)).Elem()
instancePtr := reflect.New(tType.Elem()).Interface()
// Assert that the created instance satisfies the models.Model interface.
modelInstance, ok := instancePtr.(models.Model)
if !ok {
return nil, fmt.Errorf("instance does not satisfy the models.Model interface")
}
stmtBuilder.Model(modelInstance)
builder := &SelectBuilder[T]{
ctx: ctx,
orm: orm,
SelectBuilder: stmtBuilder,
queryOptions: queryOptions,
}
orm.GetConn().AcquireFunc(ctx, func(conn chpool.Conn) error {
builder.serverInfo = conn.Conn().ServerInfo()
return nil
})
return builder, nil
}