/
db.go
100 lines (74 loc) · 2.02 KB
/
db.go
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package sqldb
import (
"context"
"database/sql"
"github.com/FantLab/go-kit/database/rowscanner"
"github.com/FantLab/go-kit/database/sqlapi"
)
func New(sql *sql.DB) sqlapi.DB {
return &sqlDB{sql: sql}
}
type sqlDB struct {
sql *sql.DB
}
func (db sqlDB) InTransaction(perform func(sqlapi.ReaderWriter) error) error {
return inTransaction(db.sql, func(tx *sql.Tx) error {
return perform(readerWriter{tx})
})
}
func (db sqlDB) Write(ctx context.Context, q *sqlapi.Query) sqlapi.Result {
return readerWriter{db.sql}.Write(ctx, q)
}
func (db sqlDB) Read(ctx context.Context, q *sqlapi.Query, output interface{}) error {
return readerWriter{db.sql}.Read(ctx, q, output)
}
// *******************************************************
type sqlReaderWriter interface {
ExecContext(ctx context.Context, query string, args ...interface{}) (sql.Result, error)
QueryContext(ctx context.Context, query string, args ...interface{}) (*sql.Rows, error)
}
type readerWriter struct {
sql sqlReaderWriter
}
func (rw readerWriter) Write(ctx context.Context, q *sqlapi.Query) sqlapi.Result {
res, err := rw.sql.ExecContext(ctx, q.Text(), q.Args()...)
if err != nil {
return sqlapi.Result{
Error: err,
}
}
var lastInsertId, rowsAffected int64
lastInsertId, _ = res.LastInsertId()
rowsAffected, _ = res.RowsAffected()
return sqlapi.Result{
LastInsertId: lastInsertId,
RowsAffected: rowsAffected,
}
}
func (rw readerWriter) Read(ctx context.Context, q *sqlapi.Query, output interface{}) error {
rows, err := rw.sql.QueryContext(ctx, q.Text(), q.Args()...)
if err != nil {
return err
}
defer rows.Close()
return rowscanner.Scan(output, sqlRows{data: rows})
}
// *******************************************************
func inTransaction(db *sql.DB, fn func(*sql.Tx) error) (err error) {
tx, err := db.Begin()
if err != nil {
return
}
defer func() {
if p := recover(); p != nil {
_ = tx.Rollback()
panic(p)
} else if err != nil {
_ = tx.Rollback()
} else {
err = tx.Commit()
}
}()
err = fn(tx)
return
}