[英]More than one table in SQLite database in android?
我在android的sqllite數據庫中創建多個表時遇到問題。 這是我的代碼
public class DataHelper {
private static final String DATABASE_NAME = "example.db";
private static final int DATABASE_VERSION = 1;
private static final String TABLE_NAME = "table1";
private static final String SETTING_TABLE="setting";
private Context context;
private SQLiteDatabase db;
private SQLiteStatement insertStmt;
private static final String INSERT = "insert into " + TABLE_NAME +
"(name) values (?)";
private static final String INSERTSETTING = "insert into " + SETTING_TABLE +
"(name) values (?)";
public DataHelper(Context context) {
this.context = context;
OpenHelper openHelper = new OpenHelper(this.context);
this.db = openHelper.getWritableDatabase();
this.insertStmt = this.db.compileStatement(INSERT);
this.insertStmt = this.db.compileStatement(INSERTSETTING);
}
public SQLiteDatabase getDb() {
return this.db;
}
public long insert(String name) {
this.insertStmt.bindString(1, name);
return this.insertStmt.executeInsert();
}
private static class OpenHelper extends SQLiteOpenHelper {
OpenHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE " + TABLE_NAME +
" (id INTEGER PRIMARY KEY, name TEXT)");
db.execSQL("CREATE TABLE " + SETTING_TABLE +
" (id INTEGER PRIMARY KEY, name TEXT)");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
onCreate(db);
}
}
}
增加DATABASE_VERSION的值,否則onUpgrade不會被調用。
我注意到您沒有將SETTING_TABLE放在onUpgade中,並且在用INSERTSETTING替換INSERT時,您丟失了代碼頂部的第一個插入語句。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.