Android SQLite数据库

前言

以前写PHP的时候，内置了print_r()和var_dump()两个函数用于打印输出任意类型的数据内部结构，现在做Android的开发，发现并没有这种类似的函数，对于数据库的查看很不方便，于是就写了一下查看数据库表的方法代码。

代码实现

import java.util.Arrays;import android.app.Activity;import android.database.Cursor;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 SecondActivity extends Activity { public static final String TAG = "Debug Info"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); ((Button)findViewById(R.id.btnQue)).setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { MyDatabaseHelper dbhelper = new MyDatabaseHelper(SecondActivity.this, "BookStore.db", null, 1); SQLiteDatabase db = dbhelper.getWritableDatabase(); //核心区 //读取系统表 sqlite_master String sql = "select * from sqlite_master"; Cursor cursor = db.rawQuery(sql, null); //打印表的所有列名 Log.i(TAG, Arrays.toString(cursor.getColumnNames())); //打印当前数据库中的所有表 if (cursor.moveToFirst()) { do { String str = ""; for (String item : cursor.getColumnNames()) { str += item + ": " + cursor.getString(cursor.getColumnIndex(item)) + "\n"; } Log.i(TAG, str); } while (cursor.moveToNext()); } } }); }}

功能扩展

查看表是否存在

public Boolean tableIsExist(SQLiteDatabase db, String tableName){ boolean result = false; Cursor cursor = null; if(tableName == null){ return result; } String sql = "select count(*) from sqlite_master where type ='table' and name ='"+tableName.trim()+"'"; cursor = db.rawQuery(sql, null); if(cursor.moveToNext()){ if(cursor.getInt(0) > 0){ result = true; } } return result;}

查看数据库中有哪些表

public ArrayList<String> tablesInDB(SQLiteDatabase db){ ArrayList<String> list = new ArrayList<String>(); String sql = "select name from sqlite_master where type='table'"; Cursor cursor = db.rawQuery(sql, null); if (cursor.moveToFirst()) { do { list.add(cursor.getString(0)); } while (cursor.moveToNext()); } return list;}

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