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前言

以前寫PHP的時候，內置了print_r()和var_dump()兩個函數用于打印輸出任意類型的數據內部結構，現在做Android的開發，發現并沒有這種類似的函數，對于數據庫的查看很不方便，于是就寫了一下查看數據庫表的方法代碼。

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代碼實現

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";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);((Button)findViewById(R.id.btnQue)).setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {MyDatabaseHelper dbhelper = new MyDatabaseHelper(SecondActivity.this, "BookStore.db", null, 1);SQLiteDatabase db = dbhelper.getWritableDatabase();//核心區//讀取系統表 sqlite_masterString 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()));//打印當前數據庫中的所有表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());}}});}}

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功能擴展

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; }

查看數據庫中有哪些表

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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博客名稱：王樂平博客

博客地址：http://blog.lepingde.com

CSDN博客地址：http://blog.csdn.net/lecepin

總結

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