SQLITE CREATE VIEW 与 JOIN 的语法问题

Question

当我尝试将 3 个表连接在一起时，在 CREATE VIEW with JOIN 中遇到了一些麻烦，我可以做 2 个，但 3 个对我来说似乎不行。我对此很陌生，所以我只是反复试验，因为我浏览过的大部分文档都没有真正涵盖（据我所知）加入 3 个表，而且进展并不顺利，所以我支持一些建议，希望是一个解决方案。提前致谢。

这是表格：

条款

db.execSQL("CREATE TABLE " + termsTable + " (" + colTermsID + " INTEGER PRIMARY KEY , " + colTermsClass + " TEXT)");

状态

  db.execSQL("CREATE TABLE " + statTable + " (" + colStatusID + " INTEGER PRIMARY KEY , " + colStatClass + " TEXT)");

帐户

db.execSQL("CREATE TABLE " + accountsTable + " (" + colID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
            colName + " TEXT, " +
            colAmount + " Integer, " +
            colPurpose + " TEXT, " +
            colTerms +" INTEGER NOT NULL, " +
            colStatus +" INTEGER DEFAULT '1'," +
            colDate + " TEXT, " +
            "FOREIGN KEY (" + colTerms + ") REFERENCES " + termsTable + " (" + colTermsID + ") " + "," +
            "FOREIGN KEY (" + colStatus + ") REFERENCES " + statTable + " (" + colStatusID + "));");

这是我正在使用的 CREATE VIEW，它仅适用于 Terms 或 Status 中的一个，但当我尝试同时使用两者时却不行，所以我假设我在该区域做错了。

    db.execSQL("CREATE VIEW " + viewAccs +
                    " AS SELECT " + accountsTable + "." + colID + " AS _id," +
                    " " + accountsTable + "." + colName + "," +
                    " " + accountsTable + "." + colAmount + "," +
                    " " + accountsTable + "." + colPurpose + "," +
                    " " + termsTable + "." + colTermsClass + "" +
                    " FROM " + accountsTable + " JOIN " + termsTable + " ON " + accountsTable + "." + colTerms + " = " + termsTable + "." + colTermsID +
                    " " + statTable + "." + colStatClass + "" +
                    " FROM " + accountsTable+ " JOIN " + statTable + " ON " + accountsTable + "." + colStatus + " = " + statTable + "." + colStatusID +
                    " " + accountsTable + "." + colDate
    );

编辑（在此处回答）：

这是我在修复语法并遵循 X.L Ant 提到的内容后最终得到的供将来参考的实际代码。

            db.execSQL("CREATE VIEW " + viewAccs +
                    " AS SELECT " + accountsTable + "." + colID + " AS _id," +
                    " " + accountsTable + "." + colName + "," +
                    " " + accountsTable + "." + colAmount + "," +
                    " " + accountsTable + "." + colPurpose + "," +
                    " " + termsTable + "." + colTermsClass + "," +
                    " " + statTable + "." + colStatClass + "," +
                    " " + accountsTable + "." + colDate + "" +
                    " FROM " + accountsTable +
                    " JOIN " + termsTable + " ON " + accountsTable + "." + colTerms + " = " + termsTable + "." + colTermsID +
                    " JOIN " + statTable + " ON " + accountsTable + "." + colStatus + " = " + statTable + "." + colStatusID
    );

Answer 1

一个查询中不能有两个 FROM。

试试这个：

db.execSQL("CREATE VIEW " + viewAccs +
                " AS SELECT " + accountsTable + "." + colID + " AS _id," +
                " " + accountsTable + "." + colName + "," +
                " " + accountsTable + "." + colAmount + "," +
                " " + accountsTable + "." + colPurpose + "," +
                " " + termsTable + "." + colTermsClass + "" +
                " FROM " + accountsTable + 
                " JOIN " + termsTable + " ON " + accountsTable + "." + colTerms + " = " + termsTable + "." + colTermsID +
                " " + statTable + "." + colStatClass + "" +
                " JOIN " + statTable + " ON " + accountsTable + "." + colStatus + " = " + statTable + "." + colStatusID +
                " " + accountsTable + "." + colDate

确保您在 SQL 中注入的变量是安全的，可以避免注入。

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