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preparer.go
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preparer.go
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package executor
import (
"context"
"database/sql"
"fmt"
"github.com/iwanbk/gosqlbencher/query"
)
type preparer struct {
stmt *sql.Stmt
queryType query.TypeType
stmtStr string
db *sql.DB
}
func newPreparer(db *sql.DB, query query.Query) (*preparer, error) {
p := preparer{
stmtStr: query.QueryStr,
queryType: query.Type,
db: db,
}
if !query.PrepareOnInit {
return &p, nil
}
if err := p.initStmt(); err != nil {
return nil, err
}
return &p, nil
}
func (p *preparer) initStmt() error {
stmt, err := p.db.Prepare(p.stmtStr)
if err != nil {
return err
}
p.stmt = stmt
return nil
}
// Execute implements Executor.Execute
func (p *preparer) Execute(ctx context.Context, args ...interface{}) error {
var (
stmt *sql.Stmt
err error
)
if p.stmt == nil {
stmt, err = p.db.Prepare(p.stmtStr)
if err != nil {
return err
}
defer stmt.Close()
} else {
stmt = p.stmt
}
switch p.queryType {
case query.TypeExec:
_, err = stmt.Exec(args...)
case query.TypeExecContext:
_, err = stmt.ExecContext(ctx, args...)
case query.TypeQuery, query.TypeQueryContext:
var rows *sql.Rows
if p.queryType == query.TypeQuery {
rows, err = stmt.Query(args...)
} else {
rows, err = stmt.QueryContext(ctx, args...)
}
if err != nil {
return err
}
for rows.Next() {
}
err = rows.Close()
default:
err = fmt.Errorf("preparer: unsupported query type: %v", p.queryType)
}
return err
}
// Close implements Executor.Close
func (p *preparer) Close() error {
if p.stmt == nil {
return nil
}
return p.stmt.Close()
}