Java SQLite : no such column error

Question

我正在编写一个必须向数据库添加记录的 Java 应用程序。一切正常，直到我想向数据库添加一个局部变量(我想我把括号放错了或什么的)。不管怎样，我已经厌倦了寻找问题，希望能得到一些帮助。

我的代码:

public void newUser(int userID, String userName, String credentials) {
    try {
        Class.forName("org.sqlite.JDBC");
        conn = DriverManager
                .getConnection("jdbc:sqlite:c:/temp/alarmsystem.db");
        Statement statement = conn.createStatement();
        statement.execute("insert into Users values(" + 1 + "," + userName
                + "," + "'Helloskit'" + ") ");
        core.printToConsole("created");
        ResultSet rs = statement.executeQuery("select * from Users");

        while (rs.next()) {
            String s = rs.getString("Username");

            core.printToConsole("name = " + s);

        }
    } catch (Exception e) {
    }
}

错误:

java.sql.SQLException: no such column: Tombellens
at org.sqlite.DB.throwex(DB.java:288)
at org.sqlite.NestedDB.prepare(NestedDB.java:115)
at org.sqlite.DB.prepare(DB.java:114)
at org.sqlite.Stmt.execute(Stmt.java:82)
at me.server.DBCommunications.DBConnection.newUser(DBConnection.java:59)
at me.server.Core.Core.newUser(Core.java:61)
at me.server.LocalUser.Console.main(Console.java:72)

谢谢，汤姆

Answer 1

问题是 in 查询。 userName 变量未用引号引起来

使用下面的代码:

statement.execute("insert into Users values(" + 1 + ",'"  +  userName  + "',"  + "'Helloskit'" +") ");