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139 lines
2.6 KiB
Go
139 lines
2.6 KiB
Go
package db
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import (
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"database/sql"
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_ "github.com/mattn/go-sqlite3" // required blank import
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)
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// DB is the SQL database.
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type DB struct {
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conn *sql.DB
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}
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type Result sql.Result
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type Rows struct {
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Columns []string `json:"columns"`
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Values [][]interface{} `json:"values,omitempty"`
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}
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// Open an existing database, creating it if it does not exist.
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func Open(dbPath string) (*DB, error) {
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dbc, err := sql.Open("sqlite3", dbPath)
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if err != nil {
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return nil, err
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}
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return &DB{
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conn: dbc,
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}, nil
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}
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// Close closes the underlying database connection.
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func (db *DB) Close() error {
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return db.conn.Close()
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}
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func (db *DB) Execute(queries []string, tx bool) ([]sql.Result, error) {
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type Execer interface {
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Exec(query string, args ...interface{}) (sql.Result, error)
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}
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err := func() (err error) {
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var execer Execer
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defer func() {
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if t, ok := execer.(*sql.Tx); ok {
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if err != nil {
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t.Rollback()
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return
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}
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t.Commit()
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}
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}()
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if tx {
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execer, _ = db.conn.Begin()
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} else {
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execer = db.conn
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}
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for _, q := range queries {
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_, err = execer.Exec(q)
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if err != nil {
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return err
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}
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}
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return nil
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}()
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return nil, err
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}
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func (db *DB) Query(queries []string, tx bool) ([]Rows, error) {
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type Queryer interface {
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Query(query string, args ...interface{}) (*sql.Rows, error)
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}
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var allRows []Rows
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err := func() (err error) {
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var queryer Queryer
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defer func() {
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if t, ok := queryer.(*sql.Tx); ok {
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if err != nil {
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t.Rollback()
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return
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}
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t.Commit()
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}
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}()
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if tx {
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queryer, _ = db.conn.Begin()
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} else {
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queryer = db.conn
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}
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for _, q := range queries {
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rs, err := queryer.Query(q)
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if err != nil {
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return err
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}
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defer rs.Close() // This adds to all defers, right? Nothing leaks? XXX Could consume memory. Perhaps anon would be best.
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columns, err := rs.Columns()
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if err != nil {
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return err
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}
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var rows Rows
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rows.Columns = columns
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for rs.Next() {
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// Make a slice of interface{}, and the pointers to each item in the slice.
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values := make([]interface{}, len(rows.Columns))
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ptrs := make([]interface{}, len(rows.Columns))
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for i := range values {
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ptrs[i] = &values[i]
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}
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// Read all the values out.
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err = rs.Scan(ptrs...)
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if err != nil {
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return err
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}
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// Special case -- convert []uint8 to string. Perhaps this should be a config option.
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for i, v := range values {
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if w, ok := v.([]uint8); ok {
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values[i] = string(w)
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}
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}
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rows.Values = append(rows.Values, values)
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}
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allRows = append(allRows, rows)
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}
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return nil
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}()
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return allRows, err
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}
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