关于Sqlite的简单使用与总结，可直接模仿用到现有项目中~
2017-04-06 15:22
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最近刚刚开通了blog，目的就是把自己常用到的一些技术点和一些模版积累下来，方便后期做项目的时候可以直接拿出模版套着使用，而不用每次都需要找度娘去解决，非常的不方便~~~
今天的第一篇blog就把我关于sqlite常用的一些套路分享出来（其实大部分也是模仿其他大牛写的），方便我们大家共同学习进步，有什么不对的地方，希望看到的人儿批评指正，哈哈~~~
1.第一种模式：
先看SQLiteOpenHelper类：
public class SQLHelper extends SQLiteOpenHelper {
public static final String DB_NAME = "database.db";// 数据库名称
public static final int VERSION = 1;
public static final String TABLE_PERSON = "PersonItem";// 数据表
public static final String ID = "id";//
public static final String NAME = "name";
public static final String SEX = "sex";
public static final String AGE = "age";
private Context context;
public SQLHelper(Context context) {
super(context, DB_NAME, null, VERSION);
this.context = context;
}
public Context getContext() {
return context;
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO 创建数据库后，对数据库的操作
String sql = "create table if not exists " + TABLE_CHANNEL +
"(_id INTEGER PRIMARY KEY AUTOINCREMENT, " +
ID + " INTEGER , " +
NAME + " TEXT , " +
AGE + " INTEGER , " +
SEX + " TEXT)";
db.execSQL(sql);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
onCreate(db);
}
}
再看DBUtils类：
public class DBUtils {
private static DBUtils mInstance;
private SQLHelper mSQLHelp;
private SQLiteDatabase mSQLiteDatabase;
public DBUtils(Context context) {
mSQLHelp = new SQLHelper(context);
mSQLiteDatabase = mSQLHelp.getWritableDatabase();
}
public static DBUtils getInstance(Context context){
if (mInstance == null){
mInstance = new DBUtils(context);
}
return mInstance;
}
public void close() {
mSQLHelp.close();
mSQLHelp = null;
mSQLiteDatabase.close();
mSQLiteDatabase = null;
mInstance = null;
}
/**
* 插入数据
*/
public void insertData(ContentValues values){
mSQLiteDatabase.insert(SQLHelper.TABLE_PERSON, null, values);
}
/**
* 修改数据
*/
public void updateData(ContentValues values, String whereClause,
String[] whereArgs){
mSQLiteDatabase.update(SQLHelper.TABLE_PERSON, values, whereClause,
whereArgs);
}
/**
* 删除数据
*/
public void deleteData(String whereClause, String[] whereArgs){
mSQLiteDatabase.delete(SQLHelper.TABLE_PERSON, whereClause, whereArgs);
}
/**
* 按搜索条件查询数据
*/
public Cursor selectData(String[] columns, String selection,
String[] selectionArgs, String groupBy, String having,
String orderBy){
Cursor cursor = mSQLiteDatabase.query(SQLHelper.TABLE_PERSON, columns, selection,
selectionArgs, groupBy, having, orderBy);
return cursor;
}
}
2.第二种模式（纯粹是为了做对比，从别的地方挪过来的）：
先看SQLiteHelper类：
public class SqliteDataHelper extends SQLiteOpenHelper {
public static final String TABLE_NOTES = "notes";
public static final String COLUMN_ID = "_id";
public static final String COLUMN_TITLE = "title";
public static final String COLUMN_LAST_REVIEWED = "last_reviewed";
public static final String COLUMN_TOTAL_REVIEWS = "total_reviews";
public static final String COLUMN_CONTENT = "content";
private static final String DATABASE_NAME = "notes.db";
private static final int DATABASE_VERSION = 1;
public SqliteDataHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(" CREATE TABLE " + TABLE_NOTES + " (" +
COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
COLUMN_TITLE + " TEXT NOT NULL, " +
COLUMN_LAST_REVIEWED + " TEXT NOT NULL, " +
COLUMN_TOTAL_REVIEWS + " TEXT NOT NULL, " +
COLUMN_CONTENT + " TEXT NOT NULL);"
);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NOTES);
onCreate(db);
}
}
再看DBManager类：
public class NotesDataManager {
private SqliteDataHelper helper;
private SQLiteDatabase database;
public NotesDataManager(Context context) {
helper = new SqliteDataHelper(context);
}
public void open() throws SQLException {
database = helper.getWritableDatabase();
}
public void close() {
helper.close();
}
public long insertNotes(String title, String content){
this.open();
ContentValues values = new ContentValues();
values.put(SqliteDataHelper.COLUMN_TITLE,title);
values.put(SqliteDataHelper.COLUMN_CONTENT,content);
long currentTime = System.currentTimeMillis();
values.put(SqliteDataHelper.COLUMN_LAST_REVIEWED,currentTime);
values.put(SqliteDataHelper.COLUMN_TOTAL_REVIEWS,0);
long insert = database.insert(SqliteDataHelper.TABLE_NOTES, null, values);
this.close();
return insert;
}
public long deleteNotes(String title, String content){
this.open();
int delete = database.delete(SqliteDataHelper.TABLE_NOTES, SqliteDataHelper.COLUMN_CONTENT + " = ? ", new String[]{String.valueOf(content)});
return delete;
}
public long incrementTotalReviews(String content){
this.open();
String sql = "UPDATE " + SqliteDataHelper.TABLE_NOTES +
" SET " + SqliteDataHelper.COLUMN_TOTAL_REVIEWS + "=" + SqliteDataHelper.COLUMN_TOTAL_REVIEWS + "+1"+
"WHERE" + SqliteDataHelper.COLUMN_CONTENT + " >= '" + content +"'";
database.execSQL(sql); //这是sqlite的另外一种写法
this.close();
return 0;
}
public long modifyLastSeen(String content)
{
this.open();
String sql = "UPDATE " + SqliteDataHelper.TABLE_NOTES +
" SET " + SqliteDataHelper.COLUMN_LAST_REVIEWED + "=" + System.currentTimeMillis()+
" WHERE " + SqliteDataHelper.COLUMN_CONTENT + " >= '" + content+"'";
database.execSQL(sql);
/*database.execSQL("UPDATE " + SQLiteHelper.TABLE_NOTES + " SET "
+ SQLiteHelper.COLUMN_TOTAL_REVIEWS + " = " + SQLiteHelper.COLUMN_TOTAL_REVIEWS + " +1 WHERE "
+ SQLiteHelper.COLUMN_CONTENT + " = " +content);*/
this.close();
return 0;
}
public ArrayList<NoteItem> getAllNotes(){
this.open();
ArrayList<NoteItem> noteItemList = new ArrayList<NoteItem>();
Cursor cursor = database.rawQuery("select * from notes", null);
if (cursor.moveToFirst()){
while (!cursor.isAfterLast()){
String title = cursor.getString(cursor.getColumnIndex(SqliteDataHelper.COLUMN_TITLE));<
a475
br />
String last_reviewed = cursor.getString(cursor.getColumnIndex(SqliteDataHelper.COLUMN_LAST_REVIEWED));
String total_reviews = cursor.getString(cursor.getColumnIndex(SqliteDataHelper.COLUMN_TOTAL_REVIEWS));
String content = cursor.getString(cursor.getColumnIndex(SqliteDataHelper.COLUMN_CONTENT));
NoteItem item = new NoteItem(title,last_reviewed,total_reviews,content);
noteItemList.add(item);
cursor.moveToNext();
}
}
this.close();
return noteItemList;
}
public List<NoteItem> getAllNotesForNotification() {
this.open();
List<NoteItem> items = new ArrayList<NoteItem>();
Cursor cursor = database.rawQuery("select * from notes",null);
if (cursor .moveToFirst()) {
while (!cursor.isAfterLast()) {
String title = cursor.getString(cursor.getColumnIndex(SqliteDataHelper.COLUMN_TITLE));
String last_reviewed = cursor.getString(cursor.getColumnIndex(SqliteDataHelper.COLUMN_LAST_REVIEWED));
String total_reviews = cursor.getString(cursor.getColumnIndex(SqliteDataHelper.COLUMN_TOTAL_REVIEWS));
String content = cursor.getString(cursor.getColumnIndex(SqliteDataHelper.COLUMN_CONTENT));
NoteItem item = new NoteItem(title,last_reviewed,total_reviews,content);
long past_epoch = Long.valueOf(item.last_reviewed);
long current_epoch = System.currentTimeMillis();
long difference = current_epoch - past_epoch;
if (notificationRequired(difference,Integer.valueOf(item.total_reviews))) {
items.add(item);
}
cursor.moveToNext();
}
}
this.close();
return items;
}
}上述类只需要看标红的就可以，主要是学习有哪几种sql的写法。
今天的第一篇blog就把我关于sqlite常用的一些套路分享出来（其实大部分也是模仿其他大牛写的），方便我们大家共同学习进步，有什么不对的地方，希望看到的人儿批评指正，哈哈~~~
1.第一种模式：
先看SQLiteOpenHelper类：
public class SQLHelper extends SQLiteOpenHelper {
public static final String DB_NAME = "database.db";// 数据库名称
public static final int VERSION = 1;
public static final String TABLE_PERSON = "PersonItem";// 数据表
public static final String ID = "id";//
public static final String NAME = "name";
public static final String SEX = "sex";
public static final String AGE = "age";
private Context context;
public SQLHelper(Context context) {
super(context, DB_NAME, null, VERSION);
this.context = context;
}
public Context getContext() {
return context;
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO 创建数据库后，对数据库的操作
String sql = "create table if not exists " + TABLE_CHANNEL +
"(_id INTEGER PRIMARY KEY AUTOINCREMENT, " +
ID + " INTEGER , " +
NAME + " TEXT , " +
AGE + " INTEGER , " +
SEX + " TEXT)";
db.execSQL(sql);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
onCreate(db);
}
}
再看DBUtils类：
public class DBUtils {
private static DBUtils mInstance;
private SQLHelper mSQLHelp;
private SQLiteDatabase mSQLiteDatabase;
public DBUtils(Context context) {
mSQLHelp = new SQLHelper(context);
mSQLiteDatabase = mSQLHelp.getWritableDatabase();
}
public static DBUtils getInstance(Context context){
if (mInstance == null){
mInstance = new DBUtils(context);
}
return mInstance;
}
public void close() {
mSQLHelp.close();
mSQLHelp = null;
mSQLiteDatabase.close();
mSQLiteDatabase = null;
mInstance = null;
}
/**
* 插入数据
*/
public void insertData(ContentValues values){
mSQLiteDatabase.insert(SQLHelper.TABLE_PERSON, null, values);
}
/**
* 修改数据
*/
public void updateData(ContentValues values, String whereClause,
String[] whereArgs){
mSQLiteDatabase.update(SQLHelper.TABLE_PERSON, values, whereClause,
whereArgs);
}
/**
* 删除数据
*/
public void deleteData(String whereClause, String[] whereArgs){
mSQLiteDatabase.delete(SQLHelper.TABLE_PERSON, whereClause, whereArgs);
}
/**
* 按搜索条件查询数据
*/
public Cursor selectData(String[] columns, String selection,
String[] selectionArgs, String groupBy, String having,
String orderBy){
Cursor cursor = mSQLiteDatabase.query(SQLHelper.TABLE_PERSON, columns, selection,
selectionArgs, groupBy, having, orderBy);
return cursor;
}
}
2.第二种模式（纯粹是为了做对比，从别的地方挪过来的）：
先看SQLiteHelper类：
public class SqliteDataHelper extends SQLiteOpenHelper {
public static final String TABLE_NOTES = "notes";
public static final String COLUMN_ID = "_id";
public static final String COLUMN_TITLE = "title";
public static final String COLUMN_LAST_REVIEWED = "last_reviewed";
public static final String COLUMN_TOTAL_REVIEWS = "total_reviews";
public static final String COLUMN_CONTENT = "content";
private static final String DATABASE_NAME = "notes.db";
private static final int DATABASE_VERSION = 1;
public SqliteDataHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(" CREATE TABLE " + TABLE_NOTES + " (" +
COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
COLUMN_TITLE + " TEXT NOT NULL, " +
COLUMN_LAST_REVIEWED + " TEXT NOT NULL, " +
COLUMN_TOTAL_REVIEWS + " TEXT NOT NULL, " +
COLUMN_CONTENT + " TEXT NOT NULL);"
);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NOTES);
onCreate(db);
}
}
再看DBManager类：
public class NotesDataManager {
private SqliteDataHelper helper;
private SQLiteDatabase database;
public NotesDataManager(Context context) {
helper = new SqliteDataHelper(context);
}
public void open() throws SQLException {
database = helper.getWritableDatabase();
}
public void close() {
helper.close();
}
public long insertNotes(String title, String content){
this.open();
ContentValues values = new ContentValues();
values.put(SqliteDataHelper.COLUMN_TITLE,title);
values.put(SqliteDataHelper.COLUMN_CONTENT,content);
long currentTime = System.currentTimeMillis();
values.put(SqliteDataHelper.COLUMN_LAST_REVIEWED,currentTime);
values.put(SqliteDataHelper.COLUMN_TOTAL_REVIEWS,0);
long insert = database.insert(SqliteDataHelper.TABLE_NOTES, null, values);
this.close();
return insert;
}
public long deleteNotes(String title, String content){
this.open();
int delete = database.delete(SqliteDataHelper.TABLE_NOTES, SqliteDataHelper.COLUMN_CONTENT + " = ? ", new String[]{String.valueOf(content)});
return delete;
}
public long incrementTotalReviews(String content){
this.open();
String sql = "UPDATE " + SqliteDataHelper.TABLE_NOTES +
" SET " + SqliteDataHelper.COLUMN_TOTAL_REVIEWS + "=" + SqliteDataHelper.COLUMN_TOTAL_REVIEWS + "+1"+
"WHERE" + SqliteDataHelper.COLUMN_CONTENT + " >= '" + content +"'";
database.execSQL(sql); //这是sqlite的另外一种写法
this.close();
return 0;
}
public long modifyLastSeen(String content)
{
this.open();
String sql = "UPDATE " + SqliteDataHelper.TABLE_NOTES +
" SET " + SqliteDataHelper.COLUMN_LAST_REVIEWED + "=" + System.currentTimeMillis()+
" WHERE " + SqliteDataHelper.COLUMN_CONTENT + " >= '" + content+"'";
database.execSQL(sql);
/*database.execSQL("UPDATE " + SQLiteHelper.TABLE_NOTES + " SET "
+ SQLiteHelper.COLUMN_TOTAL_REVIEWS + " = " + SQLiteHelper.COLUMN_TOTAL_REVIEWS + " +1 WHERE "
+ SQLiteHelper.COLUMN_CONTENT + " = " +content);*/
this.close();
return 0;
}
public ArrayList<NoteItem> getAllNotes(){
this.open();
ArrayList<NoteItem> noteItemList = new ArrayList<NoteItem>();
Cursor cursor = database.rawQuery("select * from notes", null);
if (cursor.moveToFirst()){
while (!cursor.isAfterLast()){
String title = cursor.getString(cursor.getColumnIndex(SqliteDataHelper.COLUMN_TITLE));<
a475
br />
String last_reviewed = cursor.getString(cursor.getColumnIndex(SqliteDataHelper.COLUMN_LAST_REVIEWED));
String total_reviews = cursor.getString(cursor.getColumnIndex(SqliteDataHelper.COLUMN_TOTAL_REVIEWS));
String content = cursor.getString(cursor.getColumnIndex(SqliteDataHelper.COLUMN_CONTENT));
NoteItem item = new NoteItem(title,last_reviewed,total_reviews,content);
noteItemList.add(item);
cursor.moveToNext();
}
}
this.close();
return noteItemList;
}
public List<NoteItem> getAllNotesForNotification() {
this.open();
List<NoteItem> items = new ArrayList<NoteItem>();
Cursor cursor = database.rawQuery("select * from notes",null);
if (cursor .moveToFirst()) {
while (!cursor.isAfterLast()) {
String title = cursor.getString(cursor.getColumnIndex(SqliteDataHelper.COLUMN_TITLE));
String last_reviewed = cursor.getString(cursor.getColumnIndex(SqliteDataHelper.COLUMN_LAST_REVIEWED));
String total_reviews = cursor.getString(cursor.getColumnIndex(SqliteDataHelper.COLUMN_TOTAL_REVIEWS));
String content = cursor.getString(cursor.getColumnIndex(SqliteDataHelper.COLUMN_CONTENT));
NoteItem item = new NoteItem(title,last_reviewed,total_reviews,content);
long past_epoch = Long.valueOf(item.last_reviewed);
long current_epoch = System.currentTimeMillis();
long difference = current_epoch - past_epoch;
if (notificationRequired(difference,Integer.valueOf(item.total_reviews))) {
items.add(item);
}
cursor.moveToNext();
}
}
this.close();
return items;
}
}上述类只需要看标红的就可以，主要是学习有哪几种sql的写法。
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