SQLiteDatabase

package com.demo.database;

import java.io.File;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.ContentValues;
import android.content.DialogInterface;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteStatement;
import android.os.Bundle;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.widget.TextView;

public class main extends Activity {
    /** Called when the activity is first created. */
    private ListView lv = null;
    private TextView tv=null;
    private SQLiteDatabase mSQLiteDatabase = null;
    private SQLiteStatement st=null;
    private static final String DATABASE_NAME = "Test.db";
    private static final String TABLE_NAME = "table_test";
    private static final String COLUMN_ID = "_id";// INTEGER PRIMARY KEY
    private static final String COLUMN_NAME = "name";// TEXT
    private static final String COLUMN_AGE = "age";// INTEGER
    private static final String CREATE_TABLE = "CREATE TABLE IF NOT EXISTS "
            + TABLE_NAME + " (" + COLUMN_ID + " INTEGER PRIMARY KEY,"
            + COLUMN_NAME + " TEXT," + COLUMN_AGE + " INTEGER)";
	private File path = new File("/sdcard/myfile");// 创建目录
	private File f = new File("/sdcard/myfile/test.db");// 创建文件

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        lv = (ListView) this.findViewById(R.id.ListView01);
        tv = (TextView) this.findViewById(R.id.counttip);
        try {
           // mSQLiteDatabase = this.openOrCreateDatabase(DATABASE_NAME,
           //         Activity.MODE_PRIVATE, null);
        	if (!path.exists()) {// 目录存在返回false
    			path.mkdirs();// 创建一个目录
    		}
    		if (!f.exists())f.createNewFile();//创建文件
    		mSQLiteDatabase=SQLiteDatabase.openOrCreateDatabase(f, null); 

        } catch (Exception ex) {
            this.ShowDialog("打开或者创建数据库异常:" + ex.getMessage());
        }
        try {
            mSQLiteDatabase.execSQL(CREATE_TABLE);
            String str = "INSERT INTO " + TABLE_NAME + " (" + COLUMN_NAME + ","
            + COLUMN_AGE + ")VALUES(?,?)";
             st= mSQLiteDatabase.compileStatement(str);
        } catch (Exception ex) {
            this.ShowDialog("创建表异常:" + ex.getMessage());
        }
         this.InsertData3();
         this.InsertData4();
//         this.InsertData2();
//         this.AddData();
         this.UpdateData();
        // this.UpdateData2();
        // this.UpdateData3();
        // this.DeleteData();
        // this.DeleteData2();
        // this.DeleteData3();
        this.SelectData();
    }   

    @Override
    protected void onPause() {
        super.onPause();
        mSQLiteDatabase.close();// 关闭数据库
    }   

    /**
     * 插入数据-execSQL
     */
    private void InsertData() {
        try {
            String str = "INSERT INTO " + TABLE_NAME + " (" + COLUMN_NAME + ","
                    + COLUMN_AGE + ")VALUES('张三',30)";
            mSQLiteDatabase.execSQL(str);
        } catch (Exception ex) {
            this.ShowDialog("插入数据异常:" + ex.getMessage());
        }   

    }   

    /**
     * 插入数据-execSQL
     */
    private void InsertData2() {
        try {
            String str = "INSERT INTO " + TABLE_NAME + " (" + COLUMN_NAME + ","
                    + COLUMN_AGE + ")VALUES(?,?)";
            Object[] ob = new Object[] { "王五", 50 };
            mSQLiteDatabase.execSQL(str, ob);
        } catch (Exception ex) {
            this.ShowDialog("插入数据异常:" + ex.getMessage());
        }
    }
    /**
     * 利用statement插入数据-execSQL
     */
    private void InsertData3() { 

        try { 

           st.bindString(1, "王阳");
           st.bindLong(2, 50);
            st.execute();

            //mSQLiteDatabase.execSQL(str, ob);
        } catch (Exception ex) {
            this.ShowDialog("插入数据异常:" + ex.getMessage());
        }
    }
    /**
     * 利用statement插入数据-execSQL
     */
    private void InsertData4() { 

        try { 

           st.bindString(1, "周军");
           st.bindLong(2, 33);
            st.execute();

            //mSQLiteDatabase.execSQL(str, ob);
        } catch (Exception ex) {
            this.ShowDialog("插入数据异常:" + ex.getMessage());
        }
    }   

    /**
     * 插入数据-insert() nullColumnHack，这个参数需要传入一个列名。SQL标准并不允许插入所有列均为空的一行数据，
     * 所以当传入的initialValues值为空或者为0时
     * ，用nullColumnHack参数指定的列会被插入值为NULL的数据，然后再将此行插入到表中。
     */
    private void AddData() {
        try {
            ContentValues cv = new ContentValues();
            cv.put(COLUMN_NAME, "李四");
            cv.put(COLUMN_AGE, 40);
            // long num = mSQLiteDatabase.insert(TABLE_NAME, COLUMN_NAME, cv);
            long num = mSQLiteDatabase.insertOrThrow(TABLE_NAME, null, cv);
            this.setTitle("num==" + num);
        } catch (Exception ex) {
            this.ShowDialog("插入数据异常:" + ex.getMessage());
        }   

    }   

    /**
     * 更新数据
     */
    private void UpdateData() {
        try {
            String str = "UPDATE " + TABLE_NAME + " SET " + COLUMN_AGE
                    + " = 25 WHERE _id=1";
            mSQLiteDatabase.execSQL(str);
        } catch (Exception ex) {
            this.ShowDialog("更新数据异常:" + ex.getMessage());
        }
    }   

    /**
     * 更新数据
     */
    private void UpdateData2() {
        try {
            String str = "UPDATE " + TABLE_NAME + " SET " + COLUMN_AGE
                    + " = ? WHERE _id=?";
            Object[] Ob = new Object[] { 33, 2 };
            mSQLiteDatabase.execSQL(str, Ob);
        } catch (Exception ex) {
            this.ShowDialog("更新数据异常:" + ex.getMessage());
        }
    }   

    /**
     * 更新数据
     */
    private void UpdateData3() {
        try {
            ContentValues cv = new ContentValues();
            cv.put(COLUMN_NAME, "李四4");
            cv.put(COLUMN_AGE, 43);
            int num = mSQLiteDatabase.update(TABLE_NAME, cv,
                    COLUMN_NAME + "=?", new String[] { "李四" });
            this.setTitle("修改行数num=" + num);
        } catch (Exception ex) {
            this.ShowDialog("更新数据异常:" + ex.getMessage());
        }
    }   

    /**
     * 删除数据
     */
    private void DeleteData() {
        try {
            String str = "DELETE FROM " + TABLE_NAME + " WHERE _id=3";
            mSQLiteDatabase.execSQL(str);
        } catch (Exception ex) {
            this.ShowDialog("删除数据异常:" + ex.getMessage());
        }
    }   

    /**
     * 删除数据
     */
    private void DeleteData2() {
        try {
            String str = "DELETE FROM " + TABLE_NAME + " WHERE _id=?";
            mSQLiteDatabase.execSQL(str, new Object[] { 2 });
        } catch (Exception ex) {
            this.ShowDialog("删除数据异常:" + ex.getMessage());
        }
    }   

    /**
     * 删除数据
     */
    private void DeleteData3() {
        try {
            int num = mSQLiteDatabase.delete(TABLE_NAME, "_id=1", null);
            this.setTitle("删除行数num=" + num);
        } catch (Exception ex) {
            this.ShowDialog("删除数据异常:" + ex.getMessage());
        }
    }   

    /**
     * 查询数据
     */
    private void SelectData() {
        try {
            String sql = "SELECT * FROM " + TABLE_NAME;
            Cursor cursor = mSQLiteDatabase.rawQuery(sql,null);
            // Cursor cursor = mSQLiteDatabase.query(TABLE_NAME, new String[] {
            // COLUMN_ID, COLUMN_NAME, COLUMN_AGE }, COLUMN_NAME + "=?",
            // new String[] { "李四" }, null, null, null);
            if (cursor != null) {
                ListAdapter adapter = new SimpleCursorAdapter(this,
                        R.layout.list, cursor, new String[] { COLUMN_ID,
                                COLUMN_NAME, COLUMN_AGE },
                        new int[] { R.id.TextView1, R.id.TextView2,
                                R.id.TextView3 });
                lv.setAdapter(adapter);   

                tv.setText(Integer.toString(cursor.getCount()));

            }
        } catch (Exception ex) {
            this.ShowDialog("查询数据异常:" + ex.getMessage());
        }
    }
    /**
     * 删除表
     */
    private void DropTable(){
        try{
            String sql = "DROP TABLE "+TABLE_NAME;
            mSQLiteDatabase.execSQL(sql);
        }catch(Exception ex){
            this.ShowDialog("删除表异常:"+ex.getMessage());
        }
    }
    /**
     * 删除数据库
     */
    private void DropDatabase(){
        try{
            this.deleteDatabase(DATABASE_NAME);
        }catch(Exception ex){
            this.ShowDialog("删除数据库异常:"+ex.getMessage());
        }
    }
    /**
     * 提示对话框
     * @param msg
     */
    private void ShowDialog(String msg) {
        new AlertDialog.Builder(this).setTitle("提示").setMessage(msg)
                .setPositiveButton("OK", new DialogInterface.OnClickListener() {   

                    @Override
                    public void onClick(DialogInterface dialog, int which) {   

                    }   

                }).show();
    }
}