/
select.go
125 lines (107 loc) · 3.48 KB
/
select.go
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package dynamodb
import (
"context"
"fmt"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
"github.com/aws/aws-sdk-go-v2/feature/dynamodb/expression"
"github.com/aws/aws-sdk-go-v2/service/dynamodb"
"github.com/lbernardo/go-database-odm/pkg/adapters"
)
type Select struct {
adapter *DynamoAdapter
model any
tableName string
conditions []expression.ConditionBuilder
}
func NewSelect(adapter *DynamoAdapter) *Select {
return &Select{adapter: adapter, conditions: []expression.ConditionBuilder{}}
}
func (s *Select) Model(model any) adapters.Select {
s.tableName = s.adapter.TableName(model)
s.model = model
return s
}
func (s *Select) Condition(name string, value any) adapters.Select {
filter := expression.Name(name).Equal(expression.Value(value))
s.conditions = append(s.conditions, filter)
return s
}
func (s *Select) GreaterThan(name string, value any) adapters.Select {
filter := expression.Name(name).GreaterThan(expression.Value(value))
s.conditions = append(s.conditions, filter)
return s
}
func (s *Select) GreaterThanEqual(name string, value any) adapters.Select {
filter := expression.Name(name).GreaterThanEqual(expression.Value(value))
s.conditions = append(s.conditions, filter)
return s
}
func (s *Select) LessThan(name string, value any) adapters.Select {
filter := expression.Name(name).LessThan(expression.Value(value))
s.conditions = append(s.conditions, filter)
return s
}
func (s *Select) LessThanEqual(name string, value any) adapters.Select {
filter := expression.Name(name).LessThanEqual(expression.Value(value))
s.conditions = append(s.conditions, filter)
return s
}
func (s *Select) In(name string, value any) adapters.Select {
filter := expression.Name(name).In(expression.Value(value))
s.conditions = append(s.conditions, filter)
return s
}
func (s *Select) NotEqual(name string, value any) adapters.Select {
filter := expression.Name(name).NotEqual(expression.Value(value))
s.conditions = append(s.conditions, filter)
return s
}
func (s *Select) Count(ctx context.Context) (int64, error) {
if s.model == nil {
return -1, fmt.Errorf(".Model(model any) is required")
}
output, err := s.scan(ctx)
if err != nil {
return -1, fmt.Errorf("error in scan: %v", err)
}
return int64(output.Count), nil
}
func (s *Select) OrderBy(name string, order string) adapters.Select {
fmt.Println("\033[1;33m[WARN]\033[0m DynamoDB not implements OrderBy")
return s
}
func (s *Select) Exec(ctx context.Context) error {
if s.model == nil {
return fmt.Errorf(".Model(model any) is required")
}
output, err := s.scan(ctx)
if err != nil {
return fmt.Errorf("error in Scan table %v , %v", s.tableName, err)
}
if err := attributevalue.UnmarshalListOfMaps(output.Items, s.model); err != nil {
return fmt.Errorf("error to UnmarshlListOfMaps %v", err)
}
return nil
}
func (s *Select) scan(ctx context.Context) (*dynamodb.ScanOutput, error) {
var filter expression.ConditionBuilder
for i, condition := range s.conditions {
if i == 0 {
filter = condition
continue
}
filter.And(condition)
}
expr, err := expression.NewBuilder().WithFilter(filter).Build()
if err != nil {
return nil, fmt.Errorf("error to create conditions %v", err)
}
output, err := s.adapter.client.Scan(ctx, &dynamodb.ScanInput{
TableName: aws.String(s.tableName),
ExpressionAttributeNames: expr.Names(),
ExpressionAttributeValues: expr.Values(),
FilterExpression: expr.Filter(),
})
return output, err
}