gosora/query_gen/lib/acc_builders.go

230 lines
5.4 KiB
Go

package qgen
import (
"database/sql"
"strconv"
)
type accDeleteBuilder struct {
table string
where string
build *Accumulator
}
func (delete *accDeleteBuilder) Where(where string) *accDeleteBuilder {
if delete.where != "" {
delete.where += " AND "
}
delete.where += where
return delete
}
func (delete *accDeleteBuilder) Prepare() *sql.Stmt {
return delete.build.SimpleDelete(delete.table, delete.where)
}
type accUpdateBuilder struct {
table string
set string
where string
build *Accumulator
}
func (update *accUpdateBuilder) Set(set string) *accUpdateBuilder {
update.set = set
return update
}
func (update *accUpdateBuilder) Where(where string) *accUpdateBuilder {
if update.where != "" {
update.where += " AND "
}
update.where += where
return update
}
func (update *accUpdateBuilder) Prepare() *sql.Stmt {
return update.build.SimpleUpdate(update.table, update.set, update.where)
}
type AccSelectBuilder struct {
table string
columns string
where string
orderby string
limit string
dateCutoff *dateCutoff // We might want to do this in a slightly less hacky way
inChain *AccSelectBuilder
inColumn string
build *Accumulator
}
func (selectItem *AccSelectBuilder) Columns(columns string) *AccSelectBuilder {
selectItem.columns = columns
return selectItem
}
func (selectItem *AccSelectBuilder) Where(where string) *AccSelectBuilder {
if selectItem.where != "" {
selectItem.where += " AND "
}
selectItem.where += where
return selectItem
}
// TODO: Don't implement the SQL at the accumulator level but the adapter level
func (selectItem *AccSelectBuilder) In(column string, inList []int) *AccSelectBuilder {
if len(inList) == 0 {
return selectItem
}
var where = column + " IN("
for _, item := range inList {
where += strconv.Itoa(item) + ","
}
where = where[:len(where)-1] + ")"
if selectItem.where != "" {
where += " AND " + selectItem.where
}
selectItem.where = where
return selectItem
}
func (selectItem *AccSelectBuilder) InQ(column string, subBuilder *AccSelectBuilder) *AccSelectBuilder {
selectItem.inChain = subBuilder
selectItem.inColumn = column
return selectItem
}
func (selectItem *AccSelectBuilder) DateCutoff(column string, quantity int, unit string) *AccSelectBuilder {
selectItem.dateCutoff = &dateCutoff{column, quantity, unit}
return selectItem
}
func (selectItem *AccSelectBuilder) Orderby(orderby string) *AccSelectBuilder {
selectItem.orderby = orderby
return selectItem
}
func (selectItem *AccSelectBuilder) Limit(limit string) *AccSelectBuilder {
selectItem.limit = limit
return selectItem
}
func (selectItem *AccSelectBuilder) Prepare() *sql.Stmt {
// TODO: Phase out the procedural API and use the adapter's OO API? The OO API might need a bit more work before we do that and it needs to be rolled out to MSSQL.
if selectItem.dateCutoff != nil || selectItem.inChain != nil {
selectBuilder := selectItem.build.GetAdapter().Builder().Select().FromAcc(selectItem)
return selectItem.build.prepare(selectItem.build.GetAdapter().ComplexSelect(selectBuilder))
}
return selectItem.build.SimpleSelect(selectItem.table, selectItem.columns, selectItem.where, selectItem.orderby, selectItem.limit)
}
func (selectItem *AccSelectBuilder) Query(args ...interface{}) (*sql.Rows, error) {
stmt := selectItem.Prepare()
if stmt != nil {
return stmt.Query(args...)
}
return nil, selectItem.build.FirstError()
}
type AccRowWrap struct {
row *sql.Row
err error
}
func (wrap *AccRowWrap) Scan(dest ...interface{}) error {
if wrap.err != nil {
return wrap.err
}
return wrap.row.Scan(dest...)
}
// TODO: Test to make sure the errors are passed up properly
func (selectItem *AccSelectBuilder) QueryRow(args ...interface{}) *AccRowWrap {
stmt := selectItem.Prepare()
if stmt != nil {
return &AccRowWrap{stmt.QueryRow(args...), nil}
}
return &AccRowWrap{nil, selectItem.build.FirstError()}
}
// Experimental, reduces lines
func (selectItem *AccSelectBuilder) Each(handle func(*sql.Rows) error) error {
rows, err := selectItem.Query()
if err != nil {
return err
}
defer rows.Close()
for rows.Next() {
err = handle(rows)
if err != nil {
return err
}
}
return rows.Err()
}
type accInsertBuilder struct {
table string
columns string
fields string
build *Accumulator
}
func (insert *accInsertBuilder) Columns(columns string) *accInsertBuilder {
insert.columns = columns
return insert
}
func (insert *accInsertBuilder) Fields(fields string) *accInsertBuilder {
insert.fields = fields
return insert
}
func (insert *accInsertBuilder) Prepare() *sql.Stmt {
return insert.build.SimpleInsert(insert.table, insert.columns, insert.fields)
}
func (insert *accInsertBuilder) Exec(args ...interface{}) (res sql.Result, err error) {
stmt := insert.Prepare()
if stmt != nil {
return stmt.Exec(args...)
}
return res, insert.build.FirstError()
}
type accCountBuilder struct {
table string
where string
limit string
build *Accumulator
}
func (count *accCountBuilder) Where(where string) *accCountBuilder {
if count.where != "" {
count.where += " AND "
}
count.where += where
return count
}
func (count *accCountBuilder) Limit(limit string) *accCountBuilder {
count.limit = limit
return count
}
// TODO: Add QueryRow for this and use it in statistics.go
func (count *accCountBuilder) Prepare() *sql.Stmt {
return count.build.SimpleCount(count.table, count.where, count.limit)
}
// TODO: Add a Sum builder for summing viewchunks up into one number for the dashboard?