Android SQL Lite帮助：创建数据库表

Question

我一直在尝试引用旧代码来创建表。我改变了新表的键/列名称，一切正常。但是，当我尝试将名称从“费用”（从旧代码）更改为“交易”（新代码）时。我

E/SQLiteLog: (1) near "transaction": syntax error 
D/AndroidRuntime: Shutting down VM 
E/AndroidRuntime: FATAL EXCEPTION: main 
    Process: com.cs465.groceryrun.groceryrun, PID: 7199 
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.cs465.groceryrun.groceryrun/com.cs465.groceryrun.groceryrun.Transactions}: android.database.sqlite.SQLiteException: near "transaction": syntax error (code 1): , while compiling: CREATE TABLE transaction (_id INTEGER PRIMARY KEY,title TEXT,person TEXT,role TEXT,date TEXT,due_date TEXT,status TEXT,rating REAL,amount REAL); 

我所做的只是从改变TABLE_NAME：

public static abstract class TransactionTable implements BaseColumns { 

    public static final String TABLE_NAME = "expense"; 
    public static final String COLUMN_NAME_TITLE = "title"; 
    public static final String COLUMN_NAME_PERSON = "person"; 
    public static final String COLUMN_NAME_ROLE = "role"; 
    public static final String COLUMN_NAME_DATE = "date"; 
    public static final String COLUMN_NAME_DUE_DATE = "due_date"; 
    public static final String COLUMN_NAME_STATUS = "status"; 
    public static final String COLUMN_NAME_RATING = "rating"; 
    public static final String COLUMN_NAME_AMOUNT = "amount"; 

    public static final String CREATE_TABLE = "CREATE TABLE " + TABLE_NAME + " (" + 
      _ID + " INTEGER PRIMARY KEY," + 
      COLUMN_NAME_TITLE + TEXT_TYPE + COMMA_SEP + 
      COLUMN_NAME_PERSON + TEXT_TYPE + COMMA_SEP + 
      COLUMN_NAME_ROLE + TEXT_TYPE + COMMA_SEP + 
      COLUMN_NAME_DATE + TEXT_TYPE + COMMA_SEP + 
      COLUMN_NAME_DUE_DATE + TEXT_TYPE + COMMA_SEP + 
      COLUMN_NAME_STATUS + TEXT_TYPE + COMMA_SEP + 
      COLUMN_NAME_RATING + REAL_TYPE + COMMA_SEP + 
      COLUMN_NAME_AMOUNT + REAL_TYPE + ");"; 

    public static final String DELETE_TABLE = "DROP TABLE IF EXISTS " + TABLE_NAME; 
} 

到：

public static abstract class TransactionTable implements BaseColumns { 

    public static final String TABLE_NAME = "transaction"; //????? 
    public static final String COLUMN_NAME_TITLE = "title"; 
    public static final String COLUMN_NAME_PERSON = "person"; 
    public static final String COLUMN_NAME_ROLE = "role"; 
    public static final String COLUMN_NAME_DATE = "date"; 
    public static final String COLUMN_NAME_DUE_DATE = "due_date"; 
    public static final String COLUMN_NAME_STATUS = "status"; 
    public static final String COLUMN_NAME_RATING = "rating"; 
    public static final String COLUMN_NAME_AMOUNT = "amount"; 

    public static final String CREATE_TABLE = "CREATE TABLE " + TABLE_NAME + " (" + 
      _ID + " INTEGER PRIMARY KEY," + 
      COLUMN_NAME_TITLE + TEXT_TYPE + COMMA_SEP + 
      COLUMN_NAME_PERSON + TEXT_TYPE + COMMA_SEP + 
      COLUMN_NAME_ROLE + TEXT_TYPE + COMMA_SEP + 
      COLUMN_NAME_DATE + TEXT_TYPE + COMMA_SEP + 
      COLUMN_NAME_DUE_DATE + TEXT_TYPE + COMMA_SEP + 
      COLUMN_NAME_STATUS + TEXT_TYPE + COMMA_SEP + 
      COLUMN_NAME_RATING + REAL_TYPE + COMMA_SEP + 
      COLUMN_NAME_AMOUNT + REAL_TYPE + ");"; 

    public static final String DELETE_TABLE = "DROP TABLE IF EXISTS " + TABLE_NAME; 
} 

有谁知道为什么发生这种情况？

Answer 1

transaction是SQL中的reserved keyword。考虑将表格重命名为例如transactions。