Question

尝试插入TABLE_EVENTS时出错，但插入/查询TABLE_CONTACTS没有问题。这是我的创建字符串：

 private static final String DATABASE_CREATE = 

            "create table "+ TABLE_CONTACTS + "( " + COLUMN_CONTACTS_LOOKUP
            + " text primary key, " + COLUMN_CONTACTS_ADDED
            + " real not null);" +

            " create table "+ TABLE_EVENTS +"( "+ COLUMN_ID +" integer primary key autoincrement, "+
            COLUMN_EVENTS_TITLE + " text not null, "+COLUMN_EVENTS_START_TIME+" real not null, "+
            COLUMN_EVENTS_END_TIME+ " real, "+COLUMN_EVENTS_TYPE+" integer not null, "+COLUMN_EVENTS_START_LONG+" integer, "+
            COLUMN_EVENTS_START_LAT+" integer);";

用

调用

public void onCreate(SQLiteDatabase db){
            db.execSQL(DATABASE_CREATE);
        }

我的插页是

public long createEvent(String title, long start, long end, int type, int long_, int lat){
        ContentValues initialValues = new ContentValues();
        initialValues.put(COLUMN_EVENTS_TITLE, title);
        initialValues.put(COLUMN_EVENTS_START_TIME, start);
        initialValues.put(COLUMN_EVENTS_END_TIME, end);
        initialValues.put(COLUMN_EVENTS_TYPE, type);
        initialValues.put(COLUMN_EVENTS_START_LAT, lat);
        initialValues.put(COLUMN_EVENTS_START_LONG, long_);

        return  mDb.insert(TABLE_EVENTS, null, initialValues);
    }

Answer 1

这是因为SQLiteDatabase类只允许CREATE字符串中的一个DATABASE_CREATE语句。如果要创建多个表，诀窍是准备多个创建字符串，然后在onCreate方法中逐个调用它们：

public void onCreate(SQLiteDatabase db)
{
  db.execSQL(DATABASE_CREATE_CONTACTS_TABLE);
  db.execSQL(DATABASE_CREATE_EVENTS_TABLE);
}

您收到错误是因为您的事件表从未创建过。

Answer 2

SQLite只允许随时使用一个SQL命令。您需要将create语句拆分为单个字符串并逐个执行。

private static final String CREATE_TABLE_1 =
 "create table "+ TABLE_CONTACTS + "( " + COLUMN_CONTACTS_LOOKUP
            + " text primary key, " + COLUMN_CONTACTS_ADDED
            + " real not null);";


private static final String CREATE_TABLE_2 =
"create table "+ TABLE_EVENTS +"( "+ COLUMN_ID +" integer primary key autoincrement, "+
 COLUMN_EVENTS_TITLE + " text not null, "+COLUMN_EVENTS_START_TIME+" real not null, "+
 COLUMN_EVENTS_END_TIME+ " real, "+COLUMN_EVENTS_TYPE+" integer not null, "+COLUMN_EVENTS_START_LONG+" integer, "+
 COLUMN_EVENTS_START_LAT+" integer);";


public void onCreate(SQLiteDatabase db) {

db.execSQL(CREATE_TABLE_1);
db.execSQL(CREATE_TABLE_2);
}

Answer 3

我遇到了同样的问题。男孩很头疼。

为每个新表创建一个字符串，并在每个表上调用db.execSQL(query)！使用该似乎是一些问题;分隔符。

数据库创建语句没有制作第二个表？

3 个答案: