Android 未创建数据库/表

未创建SQLite数据库或表

DatabaseHelper.java

public class DatabaseHelper extends SQLiteOpenHelper {

    public static final String DATABASE_NAME = "employee_directory1";

    protected Context context;
    private static final int DATABASE_VERSION = 1;
    public DatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
        this.context = context;
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        String s;
        try {
            Toast.makeText(context, "1",Toast.LENGTH_SHORT).show();
            InputStream in = context.getResources().openRawResource(R.raw.sql);
            DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
            Document doc = builder.parse(in, null);
            NodeList statements = doc.getElementsByTagName("statement");
            for (int i=0; i<statements.getLength(); i++) {
                s = statements.item(i).getChildNodes().item(0).getNodeValue();
                db.execSQL(s);
            }
        } catch (Throwable t) {
            Toast.makeText(context, t.toString(), 50000).show();
        }
    }

---

在代码中sql查询分部分执行 请在

DatabaseHelper

的

oncreate

中更改代码。我成功地创建了一个表

@Override
    public void onCreate(SQLiteDatabase db) {
        String s = null;
        try {
            Toast.makeText(context, "1", Toast.LENGTH_SHORT).show();
            InputStream in = context.getResources().openRawResource(R.raw.sql);
            DocumentBuilder builder = DocumentBuilderFactory.newInstance()
                    .newDocumentBuilder();
            org.w3c.dom.Document doc = builder.parse(in, null);
            NodeList statements = doc.getElementsByTagName("statement");
            for (int i = 0; i < statements.getLength(); i++) {
                s = s.concat( statements.item(i).getChildNodes().item(0).getNodeValue());

            }
            Log.d("SQLEXAMPLE", s);
            db.execSQL(s);
        } catch (Throwable t) {
            Toast.makeText(context, t.toString(), 50000).show();
        }
    }

@覆盖
public void onCreate（SQLiteDatabase db）{
字符串s=null；
试一试{
Toast.makeText（上下文“1”，Toast.LENGTH_SHORT）.show（）；
InputStream in=context.getResources（）.openRawResource（R.raw.sql）；
DocumentBuilder=DocumentBuilderFactory.newInstance（）
.newDocumentBuilder（）；
org.w3c.dom.Document doc=builder.parse（in，null）；
节点列表语句=doc.getElementsByTagName（“语句”）；
for（int i=0；i

您遇到的错误是什么？删除

try catch

，卸载应用程序以删除旧数据库文件，并查看是否存在异常。完成所有这些操作。firstName列不存在错误即将出现。

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);

        setContentView(R.layout.main);

        getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.window_title);

        setContentView(R.layout.main);
        searchText = (EditText) findViewById(R.id.searchText);
        db = (new DatabaseHelper(this)).getWritableDatabase();
    }

@Override
    public void onCreate(SQLiteDatabase db) {
        String s = null;
        try {
            Toast.makeText(context, "1", Toast.LENGTH_SHORT).show();
            InputStream in = context.getResources().openRawResource(R.raw.sql);
            DocumentBuilder builder = DocumentBuilderFactory.newInstance()
                    .newDocumentBuilder();
            org.w3c.dom.Document doc = builder.parse(in, null);
            NodeList statements = doc.getElementsByTagName("statement");
            for (int i = 0; i < statements.getLength(); i++) {
                s = s.concat( statements.item(i).getChildNodes().item(0).getNodeValue());

            }
            Log.d("SQLEXAMPLE", s);
            db.execSQL(s);
        } catch (Throwable t) {
            Toast.makeText(context, t.toString(), 50000).show();
        }
    }