Question

我正在尝试在Android中创建一个新的SQLite数据库。这是我的onCreate方法：

public static final String DATABASE_NAME = "eventList.db";
public static final String TABLE_NAME = "event_table";
public static final String COL1 = "ID";
public static final String COL2 = "EVENTNAME";
public static final String COL3 = "UNIXTIMESTAMP";
public static final String COL4 = "PARTICIPANTS";
public static final String COL5 = "LOCATION";
public static final String COL6 = "LOCATIONNAME";
@Override
public void onCreate(SQLiteDatabase sqLiteDatabase) {
    String createTable = "CREATE TABLE " + TABLE_NAME + "(ID INTEGER PRIMARY KEY AUTOINCRIMENT, "
            + " EVENTNAME TEXT, UNIXTIMESTAMP INTEGER, PARTICIPANTS TEXT, LOCATION TEXT, LOCATIONNAME TEXT)";
    sqLiteDatabase.execSQL(createTable);
}

这会引发语法错误：

android.database.sqlite.SQLiteException：near“AUTOINCRIMENT”：语法错误（代码1）:,编译时：CREATE TABLE event_table（ID INTEGER PRIMARY KEY AUTOINCRIMENT，EVENTNAME TEXT，UNIXTIMESTAMP INTEGER，PARTICIPANTS TEXT，LOCATION TEXT，LOCATIONNAME TEXT）

请注意PARTICIPANTS将成为自定义对象，LOCATION将成为LatLng对象。

如何解决错误？

Answer 1

<!DOCTYPE html> <head> <link rel='stylesheet' type='text/css' href = 'routes.css'> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> </head> <body></body> <script> //o is an open space x is a wall var a = [['0','o','x','x'], ['x','o','o','o'], ['x','o','x','o'], ['x','o','o','g']]; /*printed grid looks like this var a = [[0,1,'x','x'], ['x',NaN,NaN,NaN], ['x',NaN,'x',NaN], ['x',NaN,NaN,'g']];*/ function move(startR,startC){ //(0,0) startR,startC var north = startR-1; var south = startR+1; var east = startC+1; var west = startC-1; //discard all the out of bounds locations if (north<0){north=startR;} if (south>3){south=startR;} if (east>3){east=startC;} if (west<0){west=startC;} if (a[north][startC]=='o'){newLocation(north,startC,startR,startC);} if (a[south][startC]=='o'){newLocation(south,startC,startR,startC);} if (a[startR][west]=='o'){newLocation(startR,west,startR,startC);} if (a[startR][east]=='o'){newLocation(startR,east,startR,startC);} } //newLocation() increments square I just moved to and pass the new location to the function 'move ' function newLocation(northSouth,eastWest,origR,origC){ var origValue = parseInt(a[origR,origC]); console.log(origValue); //prints NaN to console var newValue = ++origValue; a[northSouth][eastWest]=newValue; console.log(a[origR,origC]); return move(northSouth,eastWest); } move(0,0); //print board to screen for (r=0;r<4;r++){ document.write('<br>'); for (c=0;c<4;c++){ var l = document.createElement('div'); var t = document.createTextNode(a[r][c]); $(l).addClass('letterboxes'); l.appendChild(t); document.body.appendChild(l); // document.body.appendChild(letter); } } </script> </html>不正确应该是ID INTEGER PRIMARY KEY AUTOINCRIMENT

然而，根据SQLite Autoincrement ，编码AUTOINCREMENT可能最好不编码。 ID仍将是唯一标识符。

您可能还会发现使用 _id 代替 ID 作为列名称是有利的。有时需要 _id ，例如至于ID INTEGER PRIMARY KEY AUTOINCREMENT。

所以我建议使用CursorAdapters

Answer 2

你输错了

 String createTable = "CREATE TABLE " + TABLE_NAME + "(ID INTEGER PRIMARY KEY AUTOINCRIMENT, "

请注意，AUTOINCRIMENT拼写为AUTOINCREMENT

加ID应为_id 此外，由于你已经设置常量的麻烦，为什么不使用它们来节省进一步的潜在错别字？例如而不是

+ " EVENTNAME TEXT

为什么不使用

+ COL2 + " TEXT

等...

我可否建议您阅读有关如何创建数据库here的信息这是一个极好的教程，并显示了最佳实践

Answer 3

试试这个

public static final String DATABASE_NAME = "eventList.db";
public static final String TABLE_NAME = "event_table";
public static final String COL1 = "ID";
public static final String COL2 = "EVENTNAME";
public static final String COL3 = "UNIXTIMESTAMP";
public static final String COL4 = "PARTICIPANTS";
public static final String COL5 = "LOCATION";
public static final String COL6 = "LOCATIONNAME";
@Override
public void onCreate(SQLiteDatabase sqLiteDatabase) {
    String createTable = "CREATE TABLE " + TABLE_NAME + "(ID INTEGER PRIMARY KEY AUTOINCREMENT, "
            + " EVENTNAME TEXT, UNIXTIMESTAMP INTEGER, PARTICIPANTS TEXT, LOCATION TEXT, LOCATIONNAME TEXT)";
    sqLiteDatabase.execSQL(createTable);
}

我认为你拼写错误的错误将AUTOINCRIMENT替换为AUTOINCREMENT。

Android中的SQLite查询语法错误

3 个答案: