Android的SQLite基本操作

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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