玩转android sqlLite---（附android DB的图行工具）

sqlLite就像个迷你数据库，配套的操作工具还不完善，操作起来不直观。不像oracle、mysql那样有图形化的操作工作。

 

偶然在网上发现一款操作sqlLite的图形化工具  ----  SQLiteSpy（后附上链接）。如下图：

 

 怎么样！嘿嘿，虽然功能还显简单，但对开发者来说，起码说看到比较直观的界面。

 

操作步骤很简单，首先导入sqlLite 的DB文件(即File Explorer   /data /data/   )，然后进行各种sql操作。

 

顺便写一下，我常用到的sqlLite操作类，对增删查改进行了简单的封装。

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class DBHelper {
    static private DatabaseHelper mDbHelper;
    static private SQLiteDatabase mDb;

    private static final String DATABASE_NAME = "zhyy.db";

    private static final int DATABASE_VERSION = 1;

    private final Context mCtx;

    private static class DatabaseHelper extends SQLiteOpenHelper {

        DatabaseHelper(Context context) {
            super(context, DATABASE_NAME, null, DATABASE_VERSION);
        }

        @Override
        public void onCreate(SQLiteDatabase db) {

        }
        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

        }
    }

    public DBHelper(Context ctx) {
        this.mCtx = ctx;
    }

    public DBHelper open() throws SQLException {
        mDbHelper = new DatabaseHelper(mCtx);
        mDb = mDbHelper.getWritableDatabase();
        return this;
    }

    public void closeclose() {

        mDb.close();
        mDbHelper.close();
    }

    /**
     * 插入数据
     * 参数：tableName 表名
     * initialValues 要插入的列对应值
     *   */
    public long insert(String tableName,ContentValues initialValues) {

        return mDb.insert(tableName, null, initialValues);
    }


    /**
     * 删除数据
     * 参数：tableName 表名
     * deleteCondition 删除的条件
     * deleteArgs 如果deleteCondition中有“？”号，将用此数组中的值替换
     *   */
    public boolean delete(String tableName,String deleteCondition,String[] deleteArgs) {

        return mDb.delete(tableName, deleteCondition, deleteArgs) > 0;
    }


    /**
     * 更新数据
     * 参数：tableName 表名
     * initialValues 要更新的列
     * selection 更新的条件
     * selectArgs 如果selection中有“？”号，将用此数组中的值替换
     *   */
    public boolean update(String tableName,ContentValues initialValues,String selection,String[] selectArgs) {
        int returnValue = mDb.update(tableName, initialValues, selection, selectArgs);

        return  returnValue > 0;
    }

    /**
     * 取得一个列表
     * 参数：tableName 表名
     * columns 返回的列
     * selection 查询条件
     * selectArgs 如果selection中有“？”号，将用此数组中的值替换
     *   */
    public Cursor findList(String tableName,String[] columns,String selection,String[] selectionArgs,String groupBy,String having,String orderBy) {

        return mDb.query(tableName, columns, selection, selectionArgs, groupBy, having, orderBy);
    }

    /**
     * 取得单行记录
     * 参数：tableName 表名
     * columns 返回的列
     * selection 查询条件
     * selectArgs 如果selection中有“？”号，将用此数组中的值替换
     *   */
    public Cursor findInfo(String tableName,String[] columns,String selection,String[] selectionArgs,String groupBy,String having,String orderBy,String limit,boolean distinct) throws SQLException {

        Cursor mCursor = mDb.query(distinct, tableName, columns, selection, selectionArgs, groupBy, having, orderBy, limit);


        if (mCursor != null) {
            mCursor.moveToFirst();
        }
        return mCursor;

    }

    /**
     * 执行sql
     * 参数：sql 要执行的sql

     *   */
    public void execSQL(String sql){
        mDb.execSQL(sql);

    }

    /**
        * 判断某张表是否存在
        * @param tabName 表名
        * @return
        */
    public boolean isTableExist(String tableName){
               boolean result = false;
               if(tableName == null){
                       return false;
               }

               try {
                   Cursor cursor = null;
                       String sql = "select count(1) as c from sqlite_master where type ='table' and name ='"+tableName.trim()+"' ";
                       cursor = mDb.rawQuery(sql, null);
                       if(cursor.moveToNext()){
                               int count = cursor.getInt(0);
                               if(count>0){
                                       result = true;
                               }
                       }


                       cursor.close();
               } catch (Exception e) {
                       // TODO: handle exception
               }
               return result;
       }


            /**
            * 判断某张表中是否存在某字段(注，该方法无法判断表是否存在，因此应与isTableExist一起使用)
            *
            * @param tabName 表名
            * @return
            */
             public boolean isColumnExist(String tableName,String columnName){
                   boolean result = false;
                   if(tableName == null){
                           return false;
                   }


                   try {
                       Cursor cursor = null;
                           String sql = "select count(1) as c from sqlite_master where type ='table' and name ='"+tableName.trim()+"' and sql like '%"+ columnName.trim() +"%'" ;
                           cursor = mDb.rawQuery(sql, null);
                           if(cursor.moveToNext()){
                                   int count = cursor.getInt(0);
                                   if(count>0){
                                           result = true;
                                   }
                           }


                           cursor.close();
                   } catch (Exception e) {
                           // TODO: handle exception
                   }
                   return result;
           }






}

好吧，也顺便写一下各种增删查改的sql。

 

package com.android.mission.test;

import com.android.mission.util.DBHelper;

import android.content.ContentValues;
import android.database.Cursor;
import android.test.AndroidTestCase;
import android.util.Log;
/**
 * 单元测试操作sqlLite的各种sql
 */
public class testSqlLite extends AndroidTestCase{

    /**
     * 创建表
     * @throws Exception
     */
    public void createTable() throws Exception{
        DBHelper dbHelper = new DBHelper(this.getContext());
        dbHelper.open();

        String deleteSql = "drop table if exists user ";
        dbHelper.execSQL(deleteSql);

         //id是自动增长的主键，username和 password为字段名， text为字段的类型
        String sql = "CREATE TABLE user (id integer primary key autoincrement, username text, password text)";
        dbHelper.execSQL(sql);
        dbHelper.closeclose();
    }

    /**
     * 插入数据
     * @throws Exception
     */
    public void insert() throws Exception{
        DBHelper dbHelper = new DBHelper(this.getContext());
        dbHelper.open();

        ContentValues values =  new ContentValues();  //相当于map

        values.put("username", "test");
        values.put("password", "123456");

        dbHelper.insert("user", values);

        dbHelper.closeclose();
    }

    /**
     * 更新数据
     * @throws Exception
     */
    public void update() throws Exception{
        DBHelper dbHelper = new DBHelper(this.getContext());
        dbHelper.open();
        ContentValues initialValues = new ContentValues();
        initialValues.put("username", "changename");  //更新的字段和值
        dbHelper.update("user", initialValues, "id = '1'", null);   //第三个参数为 条件语句

        dbHelper.closeclose();
    }


    /**
     * 删除数据
     * @throws Exception
     */
    public void delete() throws Exception{
        DBHelper dbHelper = new DBHelper(this.getContext());
        dbHelper.open();

        String testId = "1";
        dbHelper.delete("user", "id = '"+ testId +"'", null);

        dbHelper.closeclose();
    }


    /**
     * 增加字段
     * @throws Exception
     */
    public void addColumn() throws Exception{
        DBHelper dbHelper = new DBHelper(this.getContext());
        dbHelper.open();

        String updateSql = "alter table user add company text";
        dbHelper.execSQL(updateSql);
    }

    /**
     * 查询列表
     * @throws Exception
     */
    public void selectList()throws Exception{
        DBHelper dbHelper = new DBHelper(this.getContext());
        dbHelper.open();
        Cursor returnCursor = dbHelper.findList("user",new String[] {"id","username", "password"}, "username = 'test'", null,null, null, "id desc");
        while(returnCursor.moveToNext()){
            String id = returnCursor.getString(returnCursor.getColumnIndexOrThrow("id"));
            String username = returnCursor.getString(returnCursor.getColumnIndexOrThrow("username"));
            String password = returnCursor.getString(returnCursor.getColumnIndexOrThrow("password"));
        }
    }

    /**
     * 某条信息
     * @throws Exception
     */
    public void selectInfo()throws Exception{
        DBHelper dbHelper = new DBHelper(this.getContext());
        dbHelper.open();
        Cursor returnCursor = dbHelper.findList("user",new String[] {"id","username", "password"}, "id = '1'", null,null, null, "id desc");
        if (returnCursor.getCount() > 0) {
            returnCursor.moveToFirst();
            String id = returnCursor.getString(returnCursor.getColumnIndexOrThrow("id"));
            String username = returnCursor.getString(returnCursor.getColumnIndexOrThrow("username"));
            String password = returnCursor.getString(returnCursor.getColumnIndexOrThrow("password"));
        }
    }
}