Initial commit

internal/storage/sqlite3/table_config.go

@@ -0,0 +1,61 @@
+package sqlite3
+
+import (
+	"database/sql"
+	"fmt"
+)
+
+type TableConfig struct {
+	db  *sql.DB
+	get *sql.Stmt
+	set *sql.Stmt
+}
+
+const configSchema = `
+	CREATE TABLE IF NOT EXISTS config (
+		key 		TEXT NOT NULL,
+		value 		TEXT NOT NULL,
+		PRIMARY KEY(key)
+	);
+`
+
+const configGet = `
+	SELECT value FROM config WHERE key = $1
+`
+
+const configSet = `
+	INSERT OR REPLACE INTO config (key, value) VALUES($1, $2)
+`
+
+func NewTableConfig(db *sql.DB) (*TableConfig, error) {
+	t := &TableConfig{
+		db: db,
+	}
+	_, err := db.Exec(configSchema)
+	if err != nil {
+		return nil, fmt.Errorf("db.Exec: %w", err)
+	}
+	t.get, err = db.Prepare(configGet)
+	if err != nil {
+		return nil, fmt.Errorf("db.Prepare(get): %w", err)
+	}
+	t.set, err = db.Prepare(configSet)
+	if err != nil {
+		return nil, fmt.Errorf("db.Prepare(set): %w", err)
+	}
+	return t, nil
+}
+
+func (t *TableConfig) ConfigGet(key string) (string, error) {
+	var value string
+	err := t.get.QueryRow(key).Scan(&value)
+	if err == sql.ErrNoRows {
+		return "", nil
+	}
+	return value, err
+}
+
+func (t *TableConfig) ConfigSet(key, value string) error {
+	_, err := t.set.Exec(key, value)
+	return err
+}