/
db.go
69 lines (60 loc) · 1.25 KB
/
db.go
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package db
import (
"database/sql"
"sync"
)
type DB struct {
db *sql.DB
cache map[string]*sql.Stmt
lock *sync.RWMutex
}
func (d *DB) Exec(query string, args ...any) (sql.Result, error) {
quer, err := d.getStmt(query)
if err != nil {
return nil, err
}
return quer.Exec(args...)
}
func (d *DB) Query(query string, args ...any) (*sql.Rows, error) {
quer, err := d.getStmt(query)
if err != nil {
return nil, err
}
return quer.Query(args...)
}
func (d *DB) QueryRow(query string, args ...any) *sql.Row {
quer, err := d.getStmt(query)
if err != nil {
return d.db.QueryRow(query, args...) // Can't return an error, so have the DB do it instead
}
return quer.QueryRow(args...)
}
func (d *DB) getStmt(query string) (*sql.Stmt, error) {
d.lock.RLock()
quer, exists := d.cache[query]
d.lock.RUnlock()
if !exists {
stmt, err := d.db.Prepare(query)
if err != nil {
return nil, err
}
d.lock.Lock()
d.cache[query] = stmt
d.lock.Unlock()
quer = stmt
}
return quer, nil
}
func NewDB(db *sql.DB) *DB {
return &DB{db: db, cache: make(map[string]*sql.Stmt), lock: &sync.RWMutex{}}
}
func (d *DB) GetSqlDB() *sql.DB {
return d.db
}
func (d *DB) Close() {
d.lock.Lock()
for _, stmt := range d.cache {
stmt.Close()
}
d.lock.Unlock()
}