在单击按钮时将数据插入 Android Studio 中的 SQlite 数据库

Posted 2023-04-19

【中文标题】在单击按钮时将数据插入 Android Studio 中的 SQlite 数据库

【英文标题】：Insert data into SQlite databases in Android Studio while button click

【发布时间】：2021-12-06 23:21:36

【问题描述】：

我正在制作一个插入客户测量详细信息的应用程序。 但我的数据库有问题，我不知道这是什么问题。当我点击 addbtn 时，它显示 toast failed（数据未插入） 我尝试了所有方法，但没有任何效果。请帮助我解决为什么没有插入数据。

'''

package com.example.customermanagement;
import androidx.appcompat.app.AppCompatActivity;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class Add_Customer extends AppCompatActivity 
EditText et1,et2,et3,et4,et5,et6,et7,et8,et9,et10;
Button addbtn;
    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_add__customer);
        MyHelper myhelper=new MyHelper(this);
        addbtn=(Button)findViewById(R.id.addbtn);
        addbtn.setOnClickListener(new View.OnClickListener() 
           @Override
           public void onClick(View view) 
               et1 =(EditText)findViewById(R.id.name);
               String customername=et1.getText().toString();
               //showtxt=(EditText) findViewById(R.id.others);
               //showtxt.setText(customername);
               et2 =(EditText)findViewById(R.id.phone);
               String phoneno=et2.getText().toString();
               et3 =(EditText)findViewById(R.id.lenght);
               String lenght=et3.getText().toString();
               et4 =(EditText)findViewById(R.id.teera);
               String teera=et4.getText().toString();
               et5 =(EditText)findViewById(R.id.bazu);
               String bazu=et5.getText().toString();
               et6 =(EditText)findViewById(R.id.chati);
               String chati=et6.getText().toString();
               et7 =(EditText)findViewById(R.id.qamar);
               String qamar=et7.getText().toString();
               et8 =(EditText)findViewById(R.id.shalwar);
               String shalwar=et8.getText().toString();
               et9 =(EditText)findViewById(R.id.paincha);
               String paincha=et9.getText().toString();
               et10 =(EditText)findViewById(R.id.others);
               String others=et10.getText().toString();
              // Toast.makeText(Add_Customer.this,lenght,Toast.LENGTH_SHORT).show();
               myhelper.getWritableDatabase();
               Boolean i= myhelper.insert_data(customername,phoneno,lenght,teera,bazu,chati,qamar,shalwar,paincha,"7","7","7","7","7","7","9","9",others);
                if(i==true)
                
                    Toast.makeText(Add_Customer.this,"succesfull enter",Toast.LENGTH_SHORT).show();
                
                else
                
                    Toast.makeText(Add_Customer.this,"Fail",Toast.LENGTH_SHORT).show();

                
           
       );

    

''' 还有我的数据库助手的代码

'''

package com.example.customermanagement;

import android.content.ContentValues;
import android.content.Context;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.icu.text.StringPrepParseException;
import android.widget.Toast;

public class MyHelper extends SQLiteOpenHelper 
    private static final String dbname="mydb";
    private static final int version=1;
    public MyHelper(Context context)
        super(context,dbname,null,version);
    
    @Override
    public void onCreate(SQLiteDatabase sqLiteDatabase) 

        String sql="CREATE TABLE CUSTOMER ( _id INTEGER PRIMARY KEY AUTOINCREMENT , NAME TEXT , PHONENO TEXT , LENGHT TEXT , TEERA TEXT , BAZU TEXT , CHATI TEXT , QAMAR TEXT , SHALWAR TEXT , PAINCHA TEXT , GHEERA TEXT , FRONT TEXT , SIDE TEXT , HIP TEXT , BAN TEXT , COLLAR TEXT , ZIP TEXT , T_PAINCHA TEXT , OTHERS TEXT )";
        sqLiteDatabase.execSQL(sql);
    


    @Override
    public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) 
        sqLiteDatabase.execSQL("drop table if exists CUSTOMER");
        onCreate(sqLiteDatabase);

    
    public Boolean insert_data(String name1, String phoneno1,String lenght1,String teera1,String bazu1,String chati1,String qamar1,String shalwar1,String paincha1,String gheera1,String front1,String side1,String hip1,String ban1,String collar1,String zip1,String t_paincha1,String others1) 
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues c = new ContentValues();
            long r = 0;

            c.put("NAME", name1);
            c.put("PHONENO", phoneno1);
            c.put("LENGHT", lenght1);
            c.put("TEERA", teera1);
            c.put("BAZU", bazu1);
            c.put("CHATI", chati1);
            c.put("QAMAR", qamar1);
            c.put("SHALWAR", shalwar1);
            c.put("PAINCHA", paincha1);
            c.put("GHEERA", gheera1);
            c.put("FRONT", front1);
            c.put("SIDE", side1);
            c.put("HIP", hip1);
            c.put("BAN", ban1);
            c.put("COLLAR", collar1);
            c.put("ZIP", zip1);
            c.put("T_PAINCHA", t_paincha1);
            c.put("OTHERS", others1);
             r = db.insert("CUSTOMER", null, c);


       

             if (r!=0)
        
            return false;
        
        else
        
            return true;
        

    

'''

【问题讨论】：

db.insert 返回the row ID of the newly inserted row, or -1 if an error occurred 所以你的if (r != 0) 不正确。

【参考方案1】：

这不是对您帖子的回答。

有什么理由不使用 Google 的 Room 库？它非常容易/简单，并减少了所有与 sqlite 帮助器和游标相关的生物模板代码。对于我的个人项目，我总是使用 Room。

检查这个代码实验室：https://developer.android.com/codelabs/android-room-with-a-view-kotlin#0