Add: backend session support and bug fix

pkg/database/sql_stmt.go

@@ -165,6 +165,8 @@ var countAdminQuery = `SELECT count(*) FROM users WHERE role= 1;`
 
 var getUserQuery = `SELECT id, username, role, avatar_id FROM users WHERE username = ? AND password = ? LIMIT 1;`
 
+var getUserByIdQuery = `SELECT id, username, role, avatar_id FROM users WHERE id = ? LIMIT 1;`
+
 var getAnonymousUserQuery = `SELECT id, username, role, avatar_id FROM users WHERE role = 0 LIMIT 1;`
 
 type Stmt struct {
@@ -197,6 +199,7 @@ type Stmt struct {
 	countUser          *sql.Stmt
 	countAdmin         *sql.Stmt
 	getUser            *sql.Stmt
+	getUserById        *sql.Stmt
 	getAnonymousUser   *sql.Stmt
 }
 
@@ -429,6 +432,12 @@ func NewPreparedStatement(sqlConn *sql.DB) (*Stmt, error) {
 		return nil, err
 	}
 
+	// init getUserById
+	stmt.getUserById, err = sqlConn.Prepare(getUserByIdQuery)
+	if err != nil {
+		return nil, err
+	}
+
 	// init getAnonymousUser
 	stmt.getAnonymousUser, err = sqlConn.Prepare(getAnonymousUserQuery)
 	if err != nil {