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124 lines
3.0 KiB
Go
124 lines
3.0 KiB
Go
package sql
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import (
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"context"
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"database/sql"
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"fmt"
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_ "github.com/go-sql-driver/mysql" // lint: mysql driver.
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)
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// MySQL holds the underline connection of a MySQL (or MariaDB) database.
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// See the `ConnectMySQL` package-level function.
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type MySQL struct {
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Conn *sql.DB
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}
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var _ Database = (*MySQL)(nil)
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var (
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// DefaultCharset default charset parameter for new databases.
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DefaultCharset = "utf8mb4"
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// DefaultCollation default collation parameter for new databases.
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DefaultCollation = "utf8mb4_unicode_ci"
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)
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// ConnectMySQL returns a new ready to use MySQL Database instance.
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// Accepts a single argument of "dsn", i.e:
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// username:password@tcp(localhost:3306)/myapp?parseTime=true&charset=utf8mb4&collation=utf8mb4_unicode_ci
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func ConnectMySQL(dsn string) (*MySQL, error) {
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conn, err := sql.Open("mysql", dsn)
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if err != nil {
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return nil, err
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}
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err = conn.Ping()
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if err != nil {
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conn.Close()
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return nil, err
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}
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return &MySQL{
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Conn: conn,
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}, nil
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}
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// CreateDatabase executes the CREATE DATABASE query.
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func (db *MySQL) CreateDatabase(database string) error {
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q := fmt.Sprintf("CREATE DATABASE %s DEFAULT CHARSET = %s COLLATE = %s;", database, DefaultCharset, DefaultCollation)
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_, err := db.Conn.Exec(q)
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return err
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}
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// Drop executes the DROP DATABASE query.
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func (db *MySQL) Drop(database string) error {
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q := fmt.Sprintf("DROP DATABASE %s;", database)
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_, err := db.Conn.Exec(q)
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return err
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}
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// Select performs the SELECT query for this database (dsn database name is required).
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func (db *MySQL) Select(ctx context.Context, dest interface{}, query string, args ...interface{}) error {
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rows, err := db.Conn.QueryContext(ctx, query, args...)
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if err != nil {
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return err
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}
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defer rows.Close()
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if scannable, ok := dest.(Scannable); ok {
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return scannable.Scan(rows)
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}
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if !rows.Next() {
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return ErrNoRows
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}
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return rows.Scan(dest)
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/* Uncomment this and pass a slice if u want to see reflection powers <3
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v, ok := dest.(reflect.Value)
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if !ok {
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v = reflect.Indirect(reflect.ValueOf(dest))
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}
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sliceTyp := v.Type()
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if sliceTyp.Kind() != reflect.Slice {
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sliceTyp = reflect.SliceOf(sliceTyp)
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}
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sliceElementTyp := deref(sliceTyp.Elem())
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for rows.Next() {
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obj := reflect.New(sliceElementTyp)
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obj.Interface().(Scannable).Scan(rows)
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if err != nil {
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return err
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}
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v.Set(reflect.Append(v, reflect.Indirect(obj)))
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}
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*/
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}
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// Get same as `Select` but it moves the cursor to the first result.
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func (db *MySQL) Get(ctx context.Context, dest interface{}, query string, args ...interface{}) error {
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rows, err := db.Conn.QueryContext(ctx, query, args...)
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if err != nil {
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return err
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}
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defer rows.Close()
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if !rows.Next() {
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return ErrNoRows
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}
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if scannable, ok := dest.(Scannable); ok {
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return scannable.Scan(rows)
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}
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return rows.Scan(dest)
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}
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// Exec executes a query. It does not return any rows.
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// Use the first output parameter to count the affected rows on UPDATE, INSERT, or DELETE.
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func (db *MySQL) Exec(ctx context.Context, query string, args ...interface{}) (sql.Result, error) {
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return db.Conn.ExecContext(ctx, query, args...)
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}
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