涉及SQLite的增删改查，结果用log显示

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package com.example.sqlconnecttest;
 
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
 
public class DBHelper extends SQLiteOpenHelper{
 
    /*
     * 必须有的构造器
     */
    public DBHelper(Context context, String name, CursorFactory factory,
            int version) {
        super(context, name, factory, version);
    }
 
    /*
     * 当第一次创建数据库时，就调用该方法
     */
    @Override
    public void onCreate(SQLiteDatabase db) {
        Log.i(createDatabases, 创建数据库--->);
    }
 
    /*
     * 当更新数据库时，调用该方法
     */
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        Log.i(updateDatabase, 更新数据库--->);
    }
}
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package com.example.sqlconnecttest;
 
import android.app.Activity;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
 
public class MainActivity extends Activity implements OnClickListener{
 
    private Button createDatabase;
    private Button createTable;
    private Button insert;
    private Button select;
    private Button update;
    private Button delete;
     
    private final String DATABASE_NAME = myDatabase;
    private SQLiteDatabase mySQLiteDatabase = null;
    private final String TABLE_NAME = user;
    private String SQL =
            CREATE TABLE [user] (+
            [id] INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, +
            [username] VARCHAR NOT NULL, +
            [password] VARCHAR NOT NULL, +
            [phoneNumber] VARCHAR NOT NULL);
    private DBHelper db;
     
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        createView();
        setListener();
    }
 
    private void createView(){
        createDatabase = (Button) findViewById(R.id.createDatabase);
        createTable = (Button) findViewById(R.id.createTable);
        insert = (Button) findViewById(R.id.insert);
        select = (Button) findViewById(R.id.select);
        update = (Button) findViewById(R.id.update);
        delete = (Button) findViewById(R.id.delete);
    }
    //加监听器
    private void setListener(){
        createDatabase.setOnClickListener(this);
        createTable.setOnClickListener(this);
        insert.setOnClickListener(this);
        select.setOnClickListener(this);
        update.setOnClickListener(this);
        delete.setOnClickListener(this);
    }
        //各种监听方法
    @Override
    public void onClick(View view) {
        switch(view.getId()){
        case R.id.createDatabase:
        {
            db = new DBHelper(MainActivity.this,DATABASE_NAME,null,1);
            mySQLiteDatabase = db.getWritableDatabase();
            Log.i(数据库对象, mySQLiteDatabase.toString());
            //System.out.print(数据库对象+mySQLiteDatabase);
            break;
        }
        case R.id.createTable:
        {
            db = new DBHelper(MainActivity.this, DATABASE_NAME, null, 1);
            mySQLiteDatabase = db.getWritableDatabase();
            try {
                mySQLiteDatabase.execSQL(SQL);
                Log.i(创建表, SQL);
            } catch (SQLException e) {
                e.printStackTrace();
                Log.i(创建表--》, 创建表失败----------------》);
            }
            break;
        }
        case R.id.insert:
        {
            db = new DBHelper(MainActivity.this, DATABASE_NAME, null, 1);
            mySQLiteDatabase = db.getWritableDatabase();
            ContentValues cv = new ContentValues();
            cv.put(username, 老爸);
            cv.put(password, 123456);
            cv.put(phoneNumber, 134756658888);
            long n = mySQLiteDatabase.insert(TABLE_NAME, null, cv);
            Log.i(插入数据, n + );
            mySQLiteDatabase.close();
            break;
        }
        case R.id.select:
        {
            db = new DBHelper(MainActivity.this, DATABASE_NAME, null, 1);
            mySQLiteDatabase = db.getReadableDatabase();
            /**
             * 参数1：表名
             * 参数2：要显示的列
             * 参数3：where语句
             * 参数4：where语句的条件值
             * 参数5：分组方式
             * 参数6：having条件
             * 参数7：排序方式
             */
            Cursor cursor = mySQLiteDatabase.query(TABLE_NAME,
                    new String[]{id,username,password,phoneNumber},
                    null, null, null, null, null);
            while(cursor.moveToNext()){
                int id = cursor.getInt(cursor.getColumnIndex(id));
                String username = cursor.getString(cursor.getColumnIndex(username));
                String password = cursor.getString(cursor.getColumnIndex(password));
                String phoneNumber = cursor.getString(cursor.getColumnIndex(phoneNumber));
                Log.i(query-->, id: + id + userName: + username +
                      password + password + phoneNumber + phoneNumber);
            }
            mySQLiteDatabase.close();
            break;
        }
        case R.id.update:
        {
            db = new DBHelper(MainActivity.this, DATABASE_NAME, null, 1);
            mySQLiteDatabase = db.getWritableDatabase();
            ContentValues cv1 = new ContentValues();
            cv1.put(username, admin);
            cv1.put(password, admin);
            cv1.put(phoneNumber, 1388888);
            String whereClause = id + =?;
            String[] whereArgs = {8};
            /*
             * 参数1：表名
             * 参数2：是一个ContextValue对象，就是更新的值
             * 参数3：where语句条件
             * 参数4：where条件的值
             */
            int index = mySQLiteDatabase.update(TABLE_NAME, cv1, whereClause, whereArgs);
            Log.i(update-->, index + );
            break;
        }
        case R.id.delete:
        {
            db = new DBHelper(MainActivity.this, DATABASE_NAME, null, 1);
            mySQLiteDatabase = db.getWritableDatabase();
            /***
             * 参数1：表名
             * 参数2：where语句字段
             * 参数3：where语句字段的值
             */
            String whereClause1 = id + =?;
            String[] whereArgs1 = {1};
            int num = mySQLiteDatabase.delete(TABLE_NAME, whereClause1, whereArgs1);
            Log.i(删除记录-->, num + );
            mySQLiteDatabase.close();
            break;
        }
        default:
            break;
        }
    }
}
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<relativelayout android:layout_height="match_parent" android:layout_width="match_parent" android:paddingbottom="@dimen/activity_vertical_margin" android:paddingleft="@dimen/activity_horizontal_margin" android:paddingright="@dimen/activity_horizontal_margin" android:paddingtop="@dimen/activity_vertical_margin" tools:context="com.example.sqlconnecttest.MainActivity" xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools">
 
    <textview android:id="@+id/textView" android:layout_height="wrap_content" android:layout_width="wrap_content" android:text="SQLite数据库"><button android:id="@+id/createDatabase" android:layout_below="@id/textView" android:layout_height="wrap_content" android:layout_width="fill_parent" android:text="创建一个数据库"></button><button android:id="@+id/createTable" android:layout_below="@id/createDatabase" android:layout_height="wrap_content" android:layout_width="fill_parent" android:text="创建一张表"></button><button android:id="@+id/insert" android:layout_below="@id/createTable" android:layout_height="wrap_content" android:layout_width="fill_parent" android:text="插入数据"></button><button android:id="@+id/select" android:layout_below="@id/insert" android:layout_height="wrap_content" android:layout_width="fill_parent" android:text="查询数据"></button><button android:id="@+id/update" android:layout_below="@id/select" android:layout_height="wrap_content" android:layout_width="fill_parent" android:text="更新数据"></button><button android:id="@+id/delete" android:layout_below="@id/update" android:layout_height="wrap_content" android:layout_width="fill_parent" android:text="删除数据"></button></textview></relativelayout>

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