如何從editText獲取日期並將其存儲在sqlite數據庫中

我在android上工作，我對它很陌生。我想填寫入學表格並將詳細信息存儲在SQLite數據庫中。我無法找出代碼不工作的原因。運行此代碼後，當我填寫表單並單擊「添加」按鈕時，輸出爲「無法保存數據」。如何從editText獲取日期並將其存儲在sqlite數據庫中

這是我的代碼： Admission.java

package in.eiskon.suvarnasports; 

import android.database.sqlite.SQLiteException; 

import android.os.Bundle; 
import android.support.v4.app.Fragment; 

import android.view.LayoutInflater; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 
import android.view.ViewGroup; 
import android.app.Activity; 
import android.content.Context; 
import android.content.Intent; 
import android.database.sqlite.SQLiteDatabase; 
import java.text.DateFormat; 
import android.widget.Toast; 

import java.text.ParseException; 
import java.text.SimpleDateFormat; 

import java.util.Calendar; 
import java.util.Date; 

public class Admission extends Fragment implements View.OnClickListener 
{ 
    public int id; 
    public String name; 
    public String address; 
    public Date dob; 
    public String contact; 
    public Date admission_date; 
    public String school; 
    public String fees_paid; 
    public Calendar c,c1; 

    private EditText editTextName; 
    private EditText editTextAddress; 
    private EditText editTextContact; 
    private EditText editTextDOB; 
    private EditText editTextAddDOB; 
    private EditText editTextSchool; 
    private EditText editTextFeespaid; 
    private Button btnAdd; 
    private SQLiteDatabase database; 
    private DatabaseHelper databaseHelper; 
    private Admission a; 
    private Date d; 

    @Override 
    public void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 
     databaseHelper=new DatabaseHelper(getActivity()); 
     databaseHelper.getWritableDatabase(); 
     a=new Admission(); 

    } 
    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) 
    { 
     //Inflate the layout for this fragment 
     View view= inflater.inflate(R.layout.admission_fragxml,container,false); 

     editTextName=(EditText)view.findViewById(R.id.editTextName); 
     editTextAddress=(EditText)view.findViewById(R.id.editTextAddress); 
     editTextContact=(EditText)view.findViewById(R.id.editTextContact); 
     editTextDOB=(EditText)view.findViewById(R.id.editTextDOB); 
     editTextAddDOB=(EditText)view.findViewById(R.id.editTextAddDOB); 
     editTextSchool=(EditText)view.findViewById(R.id.editTextSchool); 
     editTextFeespaid=(EditText)view.findViewById(R.id.editTextFeespaid); 

     btnAdd=(Button)view.findViewById(R.id.btnAdd); 
     btnAdd.setOnClickListener(this); 
     return view; 
    } 


    @Override 
    public void onClick(View v) 
    { 
     name = editTextName.getText().toString().trim(); 
     address = editTextAddress.getText().toString().trim(); 
     contact=editTextContact.getText().toString().trim(); 
      dob=(Date)editTextDOB.getText(); 
     //SimpleDateFormat formatter= new SimpleDateFormat("dd/mm/yyyy"); 
     //dob=formatter.format(editTextDOB.getText()); 
     //c=Calendar.getInstance(); 
     //c.setTime(editTextDOB); 
     //SimpleDateFormat sdf= new java.text.SimpleDateFormat("dd/MM/yyyy"); 
     //Date dateObject,admission_date1; 
     //try 
     //{ 
     // String dob=editTextDOB.getText().toString(); 
      // dateObject= sdf.parse(dob); 
      // String date_dob= new SimpleDateFormat("dd/MM/yyyy").format(dateObject); 
      //} 
     //catch(ParseException pe) 
     //{ 
     // pe.printStackTrace(); 
     //} 
     /* SimpleDateFormat sdf=new SimpleDateFormat("dd/MM/yyyy"); 
     Date dob=sdf.parse(editTextDOB.getText());*/ 

     //admission_date=formatter.format(editTextAddDOB.getText()); 
      admission_date=(Date)editTextAddDOB.getText(); 

     school=editTextSchool.getText().toString().trim(); 
     fees_paid=editTextFeespaid.getText().toString().trim(); 
     if(v==btnAdd) 
     { 
      System.out.println("After if() in admission but..... before insert_successful=database Helper.admission_Insert..."); 
      boolean insert_Successful=databaseHelper.admission_Insert(a); 
      System.out.println("in admission after return...."); 
      System.out.println("Value of insert_Successful"+insert_Successful); 
      if(insert_Successful) 
      { 
       Toast.makeText(getActivity().getApplicationContext(),"Information Saved Successfully",Toast.LENGTH_LONG).show(); 
      } 
      else 
      { 
       Toast.makeText(getActivity().getApplicationContext(),"Unable to Save the information",Toast.LENGTH_LONG).show(); 
      } 
     } 
    } 


}//Admission class 

This is DatabaseHelper class: 

package in.eiskon.suvarnasports; 

import java.sql.SQLException; 
import java.util.Date; 

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


public class DatabaseHelper extends SQLiteOpenHelper 
{ 
    //database info 
    private static final String DATABASE_NAME="Suvarna3DB"; 
    private static final int DATABASE_VERSION=1; 
    public static final String TAG="NAYAN"; 
    //table names 
    private static final String TABLE_FEES_PAID="tab_fees_paid"; 
    // private static final String TABLE_DETAILS="tab_details"; 
    private static final String TABLE_ADMISSION="tab_admission"; 

    //table admission 
    private static final String ID="id"; 
    private static final String NAME="name"; 
    private static final String ADDRESS="address"; 
    private static final String DATE_OF_BIRTH="DOB"; 
    private static final String ADMISSION_DATE="admission_date"; 
    private static final String CONTACT="contact"; 
    private static final String SCHOOL="school"; 
    private static final String PAID_AMOUNT="paid_amount"; 

    //table fees_paid_#1 
    private static final String ID1="id"; 
    private static final String NAME1="name"; 
    private static final String DATE_OF_PAYMENT1="date_of_payment"; 
    private static final String PAID_DATE1="paid_date"; 
    private static final String PAID_AMOUNT1="paid_amount"; 

    /* //table details_#2 
    private static final String ID2="id"; 
    private static final String NAME2="name"; 
    private static final String ADDRESS2="address"; 
    private static final String ADMISSION_DATE2="admission_date"; 
    private static final String CONTACT2="contact"; 
    private static final String DATE_OF_PAYMENT2="date_of_payment"; 
    private static final String PAID_DATE="paid_date"; 
    private static final String PAID_AMOUNT2="paid_amount";*/ 


    public static DatabaseHelper sInstance; 
    public static synchronized DatabaseHelper getInstance(Context context) 
    { 
     if(sInstance==null) 
     { 
      sInstance=new DatabaseHelper(context.getApplicationContext()); 
     } 
     System.out.println("in DatabaseHelper getInstance()"); 
     return sInstance; 

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

    @Override 
    public void onConfigure(SQLiteDatabase db) 
    { 
     super.onConfigure(db); 
     db.setForeignKeyConstraintsEnabled(true); 
     System.out.println("in DatabaseHelper onConfigure()"); 
    } 

    @Override 
    public void onCreate(SQLiteDatabase db) 
    { 
     String CREATE_ADMISSION_TABLE="CREATE TABLE "+TABLE_ADMISSION+"("+ID+" INTEGER PRIMARY KEY AUTOINCREMENT,"+NAME+" VARCHAR,"+ADDRESS+" VARCHAR,"+DATE_OF_BIRTH+" DATE,"+ADMISSION_DATE+" DATE,"+CONTACT+" VARCHAR,"+SCHOOL+" VARCHAR,"+PAID_AMOUNT+" VARCHAR)"; 
     //String CREATE_DETAILS_TABLE="CREATE TABLE"+TABLE_DETAILS+"("+ID2+" INTEGER PRIMARY KEY,"+NAME2+" VARCHAR,"+ADDRESS2+" VARCHAR,"+DATE_OF_BIRTH+" DATE,"+ADMISSION_DATE+ "DATE",+CONTACT+" VARCHAR,"+PAID_AMOUNT+" VARCHAR)"; 
     String CREATE_FEES_PAID_TABLE="CREATE TABLE "+TABLE_FEES_PAID+"("+ID1+" INTEGER,"+NAME1+" VARCHAR,"+DATE_OF_PAYMENT1+" DATE,"+PAID_DATE1+" DATE,"+PAID_AMOUNT1+" VARCHAR, FOREIGN KEY("+ID1+") REFERENCES tab_admission(id))"; 
     db.execSQL(CREATE_ADMISSION_TABLE); 
     db.execSQL(CREATE_FEES_PAID_TABLE); 
     System.out.println("in DatabaseHelper onCreate()"); 
     System.out.println("CREATE TABLE "+TABLE_ADMISSION+"("+ID+" INTEGER PRIMARY KEY AUTOINCREMENT,"+NAME+" VARCHAR,"+ADDRESS+" VARCHAR,"+DATE_OF_BIRTH+" DATE,"+ADMISSION_DATE+" DATE,"+CONTACT+" VARCHAR,"+SCHOOL+" VARCHAR,"+PAID_AMOUNT+" VARCHAR)"); 
    } 

    public void onUpgrade(SQLiteDatabase db,int oldVersion, int newVersion) 
    { 
     if(oldVersion!=newVersion) 
     { 
      db.execSQL("DROP TABLE IF EXISTS "+TABLE_ADMISSION); 
      db.execSQL("DROP TABLE IF EXISTS "+TABLE_FEES_PAID); 
      onCreate(db); 
      System.out.println("in DatabaseHelper onUpgrade()"); 

     } 
    } 

    public boolean admission_Insert(Admission admission) 
    { 
     SQLiteDatabase db=getWritableDatabase(); 
     db.beginTransaction(); 
     System.out.println("in DatabaseHelper admission_Insert() but ... before try block"); 
     try 
     { 
      System.out.println("in DatabaseHelper admission_Insert() but ... in try block"); 
      ContentValues values= new ContentValues(); 
      values.put(ID,admission.id); 
      values.put(NAME,admission.name); 
      values.put(ADDRESS,admission.address); 
      values.put(DATE_OF_BIRTH,admission.dob); 
      values.put(ADMISSION_DATE,admission.admission_date); 
      values.put(CONTACT,admission.contact); 
      values.put(SCHOOL,admission.school); 
      values.put(PAID_AMOUNT,admission.fees_paid); 
      System.out.println("in DatabaseHelper admission_Insert() but ... in try block after initialization...."); 
      boolean insert_Successful=db.insertOrThrow(TABLE_ADMISSION,null,values)>0; 
      db.setTransactionSuccessful(); 
      System.out.println("in DatabaseHelper admission_Insert() but ... in try block before return"); 
      return insert_Successful; 

     } 
     catch(Exception e) { 
      Log.d(TAG, "Error while trying to perform admission save"); 
     } 
     finally 
     { 
      db.endTransaction(); 
     } 
     return false; 
    } 
}

來源

2017-05-26 Nayan Yerate

什麼錯誤顯示在logcat的 – SSALPHAX

檢查你沒有錯過逗號。查詢字符串CREATE_FEES_PAID_TABLE =「CREATE TABLE」+ TABLE_FEES_PAID +「（」+ ID1 +「INTEGER，」+ NAME1 +「VARCHAR」，+ DATE_OF_PAYMENT1 +「DATE」，+ PAID_DATE1 +「DATE」，+ PAID_AMOUNT1 +「VARCHAR，FOREIGN KEY」（「+ ID1 +」）REFERENCES tab_admission（id））「; '沒有逗號終止它？請參閱：https://stackoverflow.com/questions/42457575/unable-to-save-data-in-sqlite-database-in-android –

我會建議在字符串中存儲日期，因爲處理它會更容易 –

在這行代碼：

boolean insert_Successful=databaseHelper.admission_Insert(a);

我沒有看到在這一刻你更新的值，它保持不變。

來源

2017-05-26 10:48:09

非常完美的例子在這裏希望它會爲你工作.. check here

來源

2017-05-26 10:52:55

如何從editText獲取日期並將其存儲在sqlite數據庫中

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