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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