/
transaction_query.go
114 lines (98 loc) · 3.64 KB
/
transaction_query.go
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package database
import (
"fmt"
"reflect"
"github.com/Gophercraft/phylactery/database/query"
"github.com/Gophercraft/phylactery/database/storage"
)
type TransactionTableQuery struct {
transaction_table *TransactionTable
expression query.Expression
column_indices []int
}
// Array the results of a query by a certain column in ascending or descending fashion
func (tx_table_query *TransactionTableQuery) OrderBy(column_name string, descending bool) *TransactionTableQuery {
schema := tx_table_query.transaction_table.Schema()
apply_query_expression_order(schema, &tx_table_query.expression, column_name, descending)
return tx_table_query
}
func (tx_table_query *TransactionTableQuery) Limit(limit uint64) *TransactionTableQuery {
tx_table_query.expression.Limit = limit
return tx_table_query
}
// Find a single record matched by the query
func (tx_table_query *TransactionTableQuery) Get(single any) (found bool, err error) {
tx_table_query.Limit(1)
table_id := tx_table_query.transaction_table.table_id
schema := tx_table_query.transaction_table.Schema()
return get_record(
table_id,
schema,
tx_table_query.transaction_table.transaction.storage_transaction,
&tx_table_query.expression,
single,
)
}
// Collect multiple records into an array passed by reference
func (tx_table_query *TransactionTableQuery) Find(multiple any) (err error) {
schema := tx_table_query.transaction_table.Schema()
return find_records(
tx_table_query.transaction_table.table_id,
schema,
tx_table_query.transaction_table.transaction.storage_transaction,
&tx_table_query.expression,
multiple,
)
}
func (tx_table_query *TransactionTableQuery) Count() (records uint64, err error) {
return tx_table_query.transaction_table.transaction.storage_transaction.Count(
tx_table_query.transaction_table.table_id,
&tx_table_query.expression)
}
func (tx_table_query *TransactionTableQuery) Delete() (deleted uint64, err error) {
return tx_table_query.transaction_table.transaction.storage_transaction.Delete(
tx_table_query.transaction_table.table_id,
&tx_table_query.expression,
)
}
func (tx_table_query *TransactionTableQuery) Columns(names ...string) *TransactionTableQuery {
schema := tx_table_query.transaction_table.Schema()
if schema == nil {
panic("Columns() requires schema")
}
tx_table_query.column_indices = apply_column_indices(schema, &tx_table_query.expression, names)
return tx_table_query
}
func (tx_table_query *TransactionTableQuery) Update(record any) (affected_rows uint64, err error) {
record_value := reflect.ValueOf(record)
// Dereference record pointer
if record_value.Kind() == reflect.Pointer {
record_value = record_value.Elem()
}
if record_value.Kind() != reflect.Struct {
err = fmt.Errorf("cannot update non-struct type")
return
}
schema := tx_table_query.transaction_table.Schema()
if schema == nil {
panic("Columns() requires schema")
}
var mapped_record storage.Record
mapped_record, err = storage.MapReflectValue(record_value, schema)
if err != nil {
return
}
return tx_table_query.UpdateRecord(mapped_record)
}
func (tx_table_query *TransactionTableQuery) UpdateRecord(mapped_record storage.Record) (affected_rows uint64, err error) {
mapped_columns := make([]any, len(tx_table_query.column_indices))
for i, index := range tx_table_query.column_indices {
mapped_columns[i] = mapped_record[index]
}
return tx_table_query.transaction_table.transaction.container.engine.Update(
tx_table_query.transaction_table.table_id,
&tx_table_query.expression,
tx_table_query.column_indices,
mapped_columns,
)
}