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sql_builder.go
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sql_builder.go
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package pop
import (
"fmt"
"regexp"
"strings"
"sync"
"github.com/gobuffalo/pop/v6/columns"
"github.com/gobuffalo/pop/v6/logging"
"github.com/jmoiron/sqlx"
)
type sqlBuilder struct {
Query Query
Model *Model
AddColumns []string
sql string
args []interface{}
isCompiled bool
err error
}
func newSQLBuilder(q Query, m *Model, addColumns ...string) *sqlBuilder {
return &sqlBuilder{
Query: q,
Model: m,
AddColumns: addColumns,
args: []interface{}{},
isCompiled: false,
}
}
var (
regexpMatchLimit = regexp.MustCompile(`(?i).*\s+limit\s+[0-9]*(\s?,\s?[0-9]*)?$`)
regexpMatchOffset = regexp.MustCompile(`(?i).*\s+offset\s+[0-9]*$`)
regexpMatchRowsOnly = regexp.MustCompile(`(?i).*\s+rows only`)
regexpMatchNames = regexp.MustCompile("(?i).*;+.*") // https://play.golang.org/p/FAmre5Sjin5
)
func hasLimitOrOffset(sqlString string) bool {
trimmedSQL := strings.TrimSpace(sqlString)
if regexpMatchLimit.MatchString(trimmedSQL) {
return true
}
if regexpMatchOffset.MatchString(trimmedSQL) {
return true
}
if regexpMatchRowsOnly.MatchString(trimmedSQL) {
return true
}
return false
}
func (sq *sqlBuilder) String() string {
if !sq.isCompiled {
sq.compile()
}
return sq.sql
}
func (sq *sqlBuilder) Args() []interface{} {
if !sq.isCompiled {
sq.compile()
}
return sq.args
}
var inRegex = regexp.MustCompile(`(?i)in\s*\(\s*\?\s*\)`)
func (sq *sqlBuilder) compile() {
if sq.sql == "" {
if sq.Query.RawSQL.Fragment != "" {
if sq.Query.Paginator != nil && !hasLimitOrOffset(sq.Query.RawSQL.Fragment) {
sq.sql = sq.buildPaginationClauses(sq.Query.RawSQL.Fragment)
} else {
if sq.Query.Paginator != nil {
log(logging.Warn, "Query already contains pagination")
}
sq.sql = sq.Query.RawSQL.Fragment
}
sq.args = sq.Query.RawSQL.Arguments
} else {
if sq.Model == nil {
sq.err = fmt.Errorf("sqlBuilder.compile() called but no RawSQL and Model specified")
return
}
switch sq.Query.Operation {
case Select:
sq.sql = sq.buildSelectSQL()
case Delete:
sq.sql = sq.buildDeleteSQL()
default:
panic("unexpected query operation " + sq.Query.Operation)
}
}
if inRegex.MatchString(sq.sql) {
s, args, err := sqlx.In(sq.sql, sq.Args()...)
if err == nil {
sq.sql = s
sq.args = args
}
}
sq.sql = sq.Query.Connection.Dialect.TranslateSQL(sq.sql)
}
}
func (sq *sqlBuilder) buildSelectSQL() string {
cols := sq.buildColumns()
fc := sq.buildfromClauses()
sql := fmt.Sprintf("SELECT %s FROM %s", cols.Readable().SelectString(), fc)
sql = sq.buildJoinClauses(sql)
sql = sq.buildWhereClauses(sql)
sql = sq.buildGroupClauses(sql)
sql = sq.buildOrderClauses(sql)
sql = sq.buildPaginationClauses(sql)
return sql
}
func (sq *sqlBuilder) buildDeleteSQL() string {
fc := sq.buildfromClauses()
sql := fmt.Sprintf("DELETE FROM %s", fc)
sql = sq.buildWhereClauses(sql)
// paginated delete supported by sqlite and mysql
// > If SQLite is compiled with the SQLITE_ENABLE_UPDATE_DELETE_LIMIT compile-time option [...] - from https://www.sqlite.org/lang_delete.html
//
// not generic enough IMO, therefore excluded
//
//switch sq.Query.Connection.Dialect.Name() {
//case nameMySQL, nameSQLite3:
// sql = sq.buildOrderClauses(sql)
// sql = sq.buildPaginationClauses(sql)
//}
return sql
}
func (sq *sqlBuilder) buildfromClauses() fromClauses {
models := []*Model{
sq.Model,
}
for _, mc := range sq.Query.belongsToThroughClauses {
models = append(models, mc.Through)
}
fc := sq.Query.fromClauses
for _, m := range models {
tableName := m.TableName()
asName := m.Alias()
fc = append(fc, fromClause{
From: tableName,
As: asName,
})
}
return fc
}
func (sq *sqlBuilder) buildWhereClauses(sql string) string {
mcs := sq.Query.belongsToThroughClauses
for _, mc := range mcs {
sq.Query.Where(fmt.Sprintf("%s.%s = ?", mc.Through.TableName(), mc.BelongsTo.associationName()), mc.BelongsTo.ID())
sq.Query.Where(fmt.Sprintf("%s.id = %s.%s", sq.Model.TableName(), mc.Through.TableName(), sq.Model.associationName()))
}
wc := sq.Query.whereClauses
if len(wc) > 0 {
sql = fmt.Sprintf("%s WHERE %s", sql, wc.Join(" AND "))
sq.args = append(sq.args, wc.Args()...)
}
return sql
}
func (sq *sqlBuilder) buildJoinClauses(sql string) string {
oc := sq.Query.joinClauses
if len(oc) > 0 {
sql += " " + oc.String()
for i := range oc {
sq.args = append(sq.args, oc[i].Arguments...)
}
}
return sql
}
func (sq *sqlBuilder) buildGroupClauses(sql string) string {
gc := sq.Query.groupClauses
if len(gc) > 0 {
sql = fmt.Sprintf("%s GROUP BY %s", sql, gc.String())
hc := sq.Query.havingClauses
if len(hc) > 0 {
sql = fmt.Sprintf("%s HAVING %s", sql, hc.String())
}
for i := range hc {
sq.args = append(sq.args, hc[i].Arguments...)
}
}
return sql
}
func (sq *sqlBuilder) buildOrderClauses(sql string) string {
oc := sq.Query.orderClauses
if len(oc) > 0 {
orderSQL := oc.Join(", ")
if regexpMatchNames.MatchString(orderSQL) {
warningMsg := fmt.Sprintf("Order clause(s) contains invalid characters: %s", orderSQL)
log(logging.Warn, warningMsg)
return sql
}
sql = fmt.Sprintf("%s ORDER BY %s", sql, orderSQL)
sq.args = append(sq.args, oc.Args()...)
}
return sql
}
func (sq *sqlBuilder) buildPaginationClauses(sql string) string {
if sq.Query.limitResults > 0 && sq.Query.Paginator == nil {
sql = fmt.Sprintf("%s LIMIT %d", sql, sq.Query.limitResults)
}
if sq.Query.Paginator != nil {
sql = fmt.Sprintf("%s LIMIT %d", sql, sq.Query.Paginator.PerPage)
sql = fmt.Sprintf("%s OFFSET %d", sql, sq.Query.Paginator.Offset)
}
return sql
}
// columnCache is used to prevent columns rebuilding.
var columnCache = map[string]columns.Columns{}
var columnCacheMutex = sync.RWMutex{}
func (sq *sqlBuilder) buildColumns() columns.Columns {
tableName := sq.Model.TableName()
asName := sq.Model.Alias()
acl := len(sq.AddColumns)
if acl == 0 {
columnCacheMutex.RLock()
cols, ok := columnCache[tableName]
columnCacheMutex.RUnlock()
// if alias is the same, don't remake columns
if ok && cols.TableAlias == asName {
return cols
}
cols = columns.ForStructWithAlias(sq.Model.Value, tableName, asName, sq.Model.IDField())
columnCacheMutex.Lock()
columnCache[tableName] = cols
columnCacheMutex.Unlock()
return cols
}
// acl > 0
cols := columns.NewColumns("", sq.Model.IDField())
cols.Add(sq.AddColumns...)
return cols
}