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53 lines
1.0 KiB
Go
53 lines
1.0 KiB
Go
package sqlite
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import (
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"database/sql"
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"sync"
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)
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// LazyStmt is a wrapper around a sql.Stmt which will be evaluated on first use.
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type LazyStmt struct {
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create func() (*sql.Stmt, error)
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stmt *sql.Stmt
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err error
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once sync.Once
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}
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// NewLazyStmt creates a new lazy statement bound to the given transaction.
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func NewLazyStmt(tx *sql.Tx, query string) *LazyStmt {
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return &LazyStmt{
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create: func() (*sql.Stmt, error) { return tx.Prepare(query) },
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}
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}
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func (s *LazyStmt) Stmt() (*sql.Stmt, error) {
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s.once.Do(func() {
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s.stmt, s.err = s.create()
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})
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return s.stmt, s.err
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}
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func (s *LazyStmt) Exec(args ...interface{}) (sql.Result, error) {
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stmt, err := s.Stmt()
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if err != nil {
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return nil, err
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}
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return stmt.Exec(args...)
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}
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func (s *LazyStmt) Query(args ...interface{}) (*sql.Rows, error) {
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stmt, err := s.Stmt()
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if err != nil {
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return nil, err
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}
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return stmt.Query(args...)
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}
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func (s *LazyStmt) QueryRow(args ...interface{}) (*sql.Row, error) {
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stmt, err := s.Stmt()
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if err != nil {
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return nil, err
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}
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return stmt.QueryRow(args...), nil
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}
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