Android 代码实现查看SQLite数据库中的表

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;

}

博客名称：王乐平博客

博客地址：http://blog.lepingde.com

CSDN博客地址：http://blog.csdn.net/lecepin