我有一个像这样的DatabaseHelper类：
package com.example.fitness;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
public class DatebaseHelper extends SQLiteOpenHelper
{
private static final String DB_NAME = "userinfo";
private static final String TABLE_NAME = "user";
private static final String FIT_REF_NO = "FIT_REF_NO";
private static final String REGN_NO = "REGN_NO";
private static final String O_NAME = "O_NAME";
private static final String MAKER_NAME = "MAKER_NAME";
private static final String MAKER_MODEL = "MAKER_MODEL";
private static final String REQ_TIME = "REQ_TIME";
private static final String RES_TIME = "RES_TIME";
private static final String IMAGE_NAME_1 = "IMAGE_NAME_1";
private static final String IMAGE_NAME_2 = "IMAGE_NAME_2";
private static final String IMAGE_NAME_3 = "IMAGE_NAME_3";
private static final String IMAGE_NAME_4 = "IMAGE_NAME_4";
private static final String IMAGE_NAME_5 = "IMAGE_NAME_5";
private static final String TEST_RESULT = "TEST_RESULT";
private static final String TEST_ON = "TEST_ON";
private static final String OFFICER_CODE = "OFFICER_CODE";
private static final String OFFICER_NAME = "OFFICER_NAME";
private static final String NO_OF_PHOTO = "NO_OF_PHOTO";
public DatebaseHelper(Context context, String db_name, CursorFactory factory, int version)
{
super(context, DB_NAME, factory, version);
}
@Override
public void onCreate(SQLiteDatabase db)
{
String create_table = "create table " + TABLE_NAME + "(id integer primary key autoincrement," + FIT_REF_NO + " text," + REGN_NO + " text," + O_NAME + " text," + MAKER_NAME + " text," + MAKER_MODEL + " text," + REQ_TIME + " text," + RES_TIME + " text," + IMAGE_NAME_1 + " text," + IMAGE_NAME_2 + " text," + IMAGE_NAME_3 + " text," + IMAGE_NAME_4 + " text," + IMAGE_NAME_5 + " text," + TEST_RESULT + " text," + TEST_ON + " text," + OFFICER_CODE + " text," + OFFICER_NAME + " text," + NO_OF_PHOTO + " text);";
db.execSQL(create_table);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
db.execSQL("DROP TABLE IF EXISTS" + TABLE_NAME);
onCreate(db);
}
}
然后就是这样的DatabaseHandler类：
package com.example.fitness;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.util.Log;
public class DatabaseHandler
{
private static final String DB_NAME = "userinfo";
private static final String TABLE_NAME = "user";
private static final String FIT_REF_NO = "FIT_REF_NO";
private static final String REGN_NO = "REGN_NO";
private static final String O_NAME = "O_NAME";
private static final String MAKER_NAME = "MAKER_NAME";
private static final String MAKER_MODEL = "MAKER_MODEL";
private static final String REQ_TIME = "REQ_TIME";
private static final String RES_TIME = "RES_TIME";
private static final String IMAGE_NAME_1 = "IMAGE_NAME_1";
private static final String IMAGE_NAME_2 = "IMAGE_NAME_2";
private static final String IMAGE_NAME_3 = "IMAGE_NAME_3";
private static final String IMAGE_NAME_4 = "IMAGE_NAME_4";
private static final String IMAGE_NAME_5 = "IMAGE_NAME_5";
private static final String TEST_RESULT = "TEST_RESULT";
private static final String TEST_ON = "TEST_ON";
private static final String OFFICER_CODE = "OFFICER_CODE";
private static final String OFFICER_NAME = "OFFICER_NAME";
private static final String NO_OF_PHOTO = "NO_OF_PHOTO";
private static final int DATABASE_VERSION = 2;
private SQLiteDatabase sqliteDB;
private DatebaseHelper dbHelper;
public DatabaseHandler(Context context)
{
dbHelper = new DatebaseHelper(context, DB_NAME, null, DATABASE_VERSION);
}
// Open Database
public void open()
{
sqliteDB = dbHelper.getWritableDatabase();
}
// Close Database
public void close()
{
if (sqliteDB != null)
sqliteDB.close();
}
public Cursor getUserInfo()
{
Cursor cursor = sqliteDB.query(TABLE_NAME, null, null, null, null, null, null);
cursor.moveToFirst();
// while(cursor.moveToNext())
// {
// Log.e("In getUserInfo()",
// "name:"+cursor.getString(1)+", age:"+cursor.getString(2));
// }
return cursor;
}
public VehicleData getFitnessInfo(String refno)
{
Cursor cursor = sqliteDB
.query(TABLE_NAME, new String[] { FIT_REF_NO, REGN_NO, O_NAME, MAKER_NAME, MAKER_MODEL }, FIT_REF_NO + "=?", new String[] { String.valueOf(refno) }, null, null, null, null);
if (cursor != null)
cursor.moveToFirst();
VehicleData vData = new VehicleData(cursor.getString(0), cursor.getString(1), cursor.getString(2), cursor.getString(3), cursor.getString(4), cursor.getString(5));
return vData;
}
public long insertUserInfo(String refno, String regno, String oname, String makername, String makermodel, String reqtime, String restime, String img1, String img2, String img3, String img4,
String img5, String testresult, String teston, String officercode, String officername, String picsnum)
{
ContentValues contentValues = new ContentValues();
sqliteDB = dbHelper.getWritableDatabase();
contentValues.put(FIT_REF_NO, refno);
contentValues.put(REGN_NO, regno);
contentValues.put(O_NAME, oname);
contentValues.put(MAKER_NAME, makername);
contentValues.put(MAKER_MODEL, makermodel);
contentValues.put(REQ_TIME, reqtime);
contentValues.put(RES_TIME, restime);
contentValues.put(IMAGE_NAME_1, img1);
contentValues.put(IMAGE_NAME_2, img2);
contentValues.put(IMAGE_NAME_3, img3);
contentValues.put(IMAGE_NAME_4, img4);
contentValues.put(IMAGE_NAME_5, img5);
contentValues.put(TEST_RESULT, testresult);
contentValues.put(TEST_ON, teston);
contentValues.put(OFFICER_CODE, officercode);
contentValues.put(OFFICER_NAME, officername);
contentValues.put(NO_OF_PHOTO, picsnum);
return sqliteDB.insert(TABLE_NAME, null, contentValues);
}
}
我尝试使用在此处调用的方法insertUserInfo将CSV中的值插入到SQLite数据库中：
package com.example.fitness;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import android.content.Context;
import android.database.Cursor;
import android.os.Environment;
import android.util.Log;
public class ImportExportExcel
{
DatabaseHandler dbHandler;
Context context;
protected static final File DATABASE_DIRECTORY = new File(Environment.getExternalStorageDirectory() + "/FitnessData/");
protected static final File IMPORT_ITEM_FILE = new File(DATABASE_DIRECTORY, "fitnesscsv.csv");
public ImportExportExcel(Context context)
{
this.context = context;
}
public Boolean exportDataToCSV(String outFileName)
{
Log.e("excel", "in exportDatabasecsv()");
Boolean returnCode = false;
String csvHeader = "";
String csvValues = "";
try
{
dbHandler = new DatabaseHandler(context);
dbHandler.open();
if (!DATABASE_DIRECTORY.exists())
{
DATABASE_DIRECTORY.mkdirs();
}
Log.e("export fun:file name", outFileName);
File outFile = new File(DATABASE_DIRECTORY, outFileName);
FileWriter fileWriter = new FileWriter(outFile);
Log.e("after FileWriter :file name", outFile.toString());
BufferedWriter out = new BufferedWriter(fileWriter);
Cursor cursor = dbHandler.getUserInfo();
// Log.e("excel", "cursor col count" + cursor.getCount());
int col_count = cursor.getColumnCount();
Log.e("col count", "" + col_count);
csvHeader += "\"" + "Id" + "\",";
csvHeader += "\"" + "Name" + "\",";
csvHeader += "\"" + "Age" + "\",";
csvHeader += "\n";
if (cursor != null)
{
out.write(csvHeader);
while (!cursor.isAfterLast())
{
// csvValues = Long.toString(cursor.getLong(0)) + ",";
csvValues = cursor.getString(0) + ","; // id
csvValues += cursor.getString(1) + ","; // name
csvValues += cursor.getString(2) + ",\n"; // age
out.write(csvValues);
cursor.moveToNext();
}
// Log.e("excel", "csvValues are:- " + csvValues);
}
out.close();
cursor.close();
returnCode = true;
}
catch (Exception e)
{
returnCode = false;
Log.e("Exception", e.getMessage());
}
dbHandler.close();
return returnCode;
}
public void importDataFromCSV()
{
int i = 0;
boolean flag_is_header = false;
File file = new File(IMPORT_ITEM_FILE.getPath());
if (file.exists())
{
}
BufferedReader bufRdr = null;
try
{
bufRdr = new BufferedReader(new FileReader(file));
}
catch (FileNotFoundException e)
{
e.printStackTrace();
}
String line = null;
try
{
while ((line = bufRdr.readLine()) != null)
{
String[] insertValues = line.split(",");
if (flag_is_header)
{
dbHandler = new DatabaseHandler(context);
dbHandler.open();
long row = dbHandler.insertUserInfo(insertValues[0], insertValues[1], insertValues[2],insertValues[3], insertValues[4], insertValues[5], insertValues[6], insertValues[7], insertValues[8], insertValues[9], insertValues[10], insertValues[11], insertValues[12], insertValues[13], insertValues[14],insertValues[15], insertValues[16]);
Log.e("no. of rows inserted", "" + row);
}
else
{
flag_is_header = true;
}
}
dbHandler.close();
bufRdr.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
在此活动中调用importDataFromCSV（）
public class ImportExportActivity extends Activity implements OnClickListener
{
DatabaseHandler databaseConnector;
Context context;
Button importBtn, exportBtn, captureBtn;
ImportExportExcel importExportExcel;
String exportFileName = "ExportExcel.csv";
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.intro);
initializeUI();
}
public void initializeUI()
{
context = this;
databaseConnector = new DatabaseHandler(context);
importExportExcel = new ImportExportExcel(context);
importBtn = (Button) findViewById(R.id.bImport);
exportBtn = (Button) findViewById(R.id.bExport);
captureBtn = (Button) findViewById(R.id.bCapture);
importBtn.setOnClickListener(this);
exportBtn.setOnClickListener(this);
captureBtn.setOnClickListener(this);
}
@Override
public void onClick(View v)
{
switch (v.getId())
{
case R.id.bImport:
importExportExcel.importDataFromCSV();
Toast.makeText(context, "File imported successfully", 1).show();
break;
case R.id.bCapture:
Intent intent = new Intent(ImportExportActivity.this, Reference.class);
startActivity(intent);
break;
case R.id.bExport:
try
{
importExportExcel.exportDataToCSV(exportFileName);
Toast.makeText(context, "File exported successfully", 1).show();
}
catch (Exception e)
{
Toast.makeText(context, "Please,Import data first", 1).show();
}
break;
default:
break;
}
}
}
Logcat说
05-07 13:42:45.255: E/SQLiteLog(2251): (1) table user has no column named O_NAME
05-07 13:42:45.282: E/SQLiteDatabase(2251): Error inserting O_NAME="RAM NARAYAN DIXIT" RES_TIME="" MAKER_NAME="SWARAJ MAZDA LTD"
FIT_REF_NO="2" TEST_RESULT="" REQ_TIME="" OFFICER_NAME="" MAKER_MODEL="WV 26 STC" REGN_NO="CG04HC3582" TEST_ON="" IMAGE_NAME_1=""
NO_OF_PHOTO="4" OFFICER_CODE="" IMAGE_NAME_2="" IMAGE_NAME_3="" IMAGE_NAME_4="" IMAGE_NAME_5=""
05-07 13:42:45.282: E/SQLiteDatabase(2251): android.database.sqlite.SQLiteException: table user has no column named O_NAME (code 1): ,
while compiling: INSERT INTO user(O_NAME,RES_TIME,MAKER_NAME,FIT_REF_NO,TEST_RESULT,REQ_TIME,OFFICER_NAME,MAKER_MODEL,REGN_NO,TEST_ON,
IMAGE_NAME_1,NO_OF_PHOTO,OFFICER_CODE,IMAGE_NAME_2,IMAGE_NAME_3,IMAGE_NAME_4,IMAGE_NAME_5) VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)
请帮帮我吗？
答案 0 :(得分：0)
Sree基本上说了什么。
每次更改与其相关的内容（新字段，新表格，......）时，您都必须更改DATABASE_VERSION