Analysis of contentvalues

I'm learning today SQLite When the database stores knowledge , Find out SQLiteDatabase Objects can be passed first ContentValues Object to assemble data , And then use it SQLiteDatabase Of the object itself insert() Methods will ContentValues Object is passed in for data storage .

that ContentValues What is it? ？

ContentValues and Bundle similar , Is to use HashMap Class for data storage in the generic form of . But the difference is Bundle Can be stored Object object , and ContentValues Only basic types can be stored .Bundle amount to HashMap<String, Object>(),ContentValues It's equivalent to HashMap<String, Basic types of data >().

ContentValues The common method of ：

// Add basic type data to the collection ,Double、Integer、String、Boolean、Byte、Float Type and so on 
public void put(String key, Short value);

public void put(String key, Long value);

public void put(String key);    // Add null 

// remove ContentValues All data in 
public void clear();

// To current ContentValues Add incoming ContentValues All values in the object 
public void putAll(ContentValues other);

// Remove key value as key The data of 
public void remove(String key);

// return ContentValues Whether the data in the object is empty 
public Boolean isEmpty();

// Return the number of data 
public int size();

// Returns a collection of key values 
public Set<String> SetKey();

// The key value obtained is key And convert it into Boolean Type return ,String、Integer、Float、Double And so on 
public Boolean getAsBoolean(String key)