我正在尝试从CSV到SQLite DB检索数据，所有字符串都已正确保存。但是整数和双打都没有，所有这些都保存为null。 但是如何拆分Integers和Doubles并将它们放入ContentValues？ 在这里，我正在尝试使用ContentValues：
public static void importSomeDBfromCSV(){
try{
FileReader file = new FileReader(currentFilePathOfsavingCSVtoSD);
BufferedReader buffer = new BufferedReader(file);
String line = "";
SQLiteDatabase db = mDbHelper.getWritableDatabase();
db.beginTransaction();
try {
while ((line = buffer.readLine()) != null) {
String[] colums = line.split(",");
if (colums.length != 8) {
Log.d("CSVParser", "Skipping Bad CSV Row");
continue;
}
ContentValues cv = new ContentValues(8);
cv.put(ProductContract.ProductEntry.COLUMN_PRODUCT_NAME, colums[0].trim());
// needs to be saved as Double
cv.put(ProductContract.ProductEntry.COLUMN_PRODUCT_PRICE, colums[1].trim());
// needs to be saved as Integer
cv.put(ProductContract.ProductEntry.COLUMN_PRODUCT_QUANTITY, colums[2].trim());
// needs to be saved as Integer
cv.put(ProductContract.ProductEntry.COLUMN_PRODUCT_SOLD, colums[3].trim());
cv.put(ProductContract.ProductEntry.COLUMN_PRODUCT_BARCODE, colums[4].trim());
cv.put(ProductContract.ProductEntry.COLUMN_PRODUCT_LOCATION, colums[5].trim());
cv.put(ProductContract.ProductEntry.COLUMN_PRODUCT_CATEGORY, colums[6].trim());
cv.put(ProductContract.ProductEntry.COLUMN_PRODUCT_NOTE, colums[7].trim());
db.insert(TABLE_NAME, null, cv);
}
} catch (IOException e) {
e.printStackTrace();
}
db.setTransactionSuccessful();
db.endTransaction();
successImportingFromCSV=true;
Log.v(LOG_TAG, "Restore is successful");
}catch(Exception e){
e.printStackTrace();
successImportingFromCSV=false;
Log.e(LOG_TAG, "Failed to restore from csv " + e);
}
}
答案 0 :(得分：0)
我不相信您提供的代码有任何问题，而是数据本身可能缺乏，或者后续数据检索不正确。我怀疑后者（看到添加的其他行似乎排除了输入数据的任何错误）。
获取此文件（在 downloads / product.csv 中）： -
Baked beans,12.56,50,10,barcode,London,Tinned Foods,red beany like things in sauce
Yellow Fin Tuna 12g tin,5.76,100,12,barcode,New York,Tinned Foods,fishy stuff
以及稍加修改的 importSomeDBfromCSV 方法： -
public void importSomeDBfromCSV(){
mDB.delete(TABLE_NAME,null,null); // Delete all rows for testing
final String LOG_TAG = "ImportDB"; // Added just to resolve LOG_TAG
String filetoimport = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).getPath() + File.separator + "products.csv"; // get the file name for testing.
try{
FileReader file = new FileReader(filetoimport);
BufferedReader buffer = new BufferedReader(file);
String line = "";
mDB.beginTransaction();
try {
while ((line = buffer.readLine()) != null) {
Log.d(LOG_TAG,"Read in line :-"); //<<<< Added for logging
String[] colums = line.split(",");
if (colums.length != 8) {
Log.d("CSVParser", "Skipping Bad CSV Row"); //<<<< Added to log
continue;
}
for (String s: colums
) {
Log.d(LOG_TAG,"Data extracted for a column = " + s); //<<<< Added to log
}
ContentValues cv = new ContentValues(8);
cv.put(COLUMN_PRODUCT_NAME, colums[0].trim());
// needs to be saved as Double
cv.put(COLUMN_PRODUCT_PRICE, colums[1].trim());
// needs to be saved as Integer
cv.put(COLUMN_PRODUCT_QUANTITY, colums[2].trim());
// needs to be saved as Integer
cv.put(COLUMN_PRODUCT_SOLD, colums[3].trim());
cv.put(COLUMN_PRODUCT_BARCODE, colums[4].trim());
cv.put(COLUMN_PRODUCT_LOCATION, colums[5].trim());
cv.put(COLUMN_PRODUCT_CATEGORY, colums[6].trim());
cv.put(COLUMN_PRODUCT_NOTE, colums[7].trim());
mDB.insert(TABLE_NAME, null, cv);
}
} catch (IOException e) {
e.printStackTrace();
}
mDB.setTransactionSuccessful();
mDB .endTransaction();
//successImportingFromCSV=true; //Commented out for ease
Log.v(LOG_TAG, "Restore is successful");
}catch(Exception e){
e.printStackTrace();
//successImportingFromCSV=false; //Commeneted out for ease
Log.e(LOG_TAG, "Failed to restore from csv " + e);
}
}
然后使用Are there any methods that assist with resolving common SQLite issues?中的一些通用数据库/游标例程运行： -
mPHlpr = new ProductsDBHelper(this); //<<<< DBHelper
mPHlpr.importSomeDBfromCSV(); //<<<< Do the import
SQLiteDatabase db = mPHlpr.getWritableDatabase(); //<<<< Get DB
CommonSQLiteUtilities.logDatabaseInfo(db); //<<< Inspect DB
Cursor csr = CommonSQLiteUtilities.getAllRowsFromTable(db,ProductsDBHelper.TABLE_NAME,false,null); //<<<< Get Cursor
CommonSQLiteUtilities.logCursorData(csr); //<<<< Inspect Cursor
importSomeDBfromCSV 方法的输出。02-08 06:04:26.773 1555-1555/? D/ImportDB: Read in line :-
02-08 06:04:26.773 1555-1555/? D/ImportDB: Data extracted for a column = Baked beans
02-08 06:04:26.773 1555-1555/? D/ImportDB: Data extracted for a column = 12.56
02-08 06:04:26.773 1555-1555/? D/ImportDB: Data extracted for a column = 50
02-08 06:04:26.773 1555-1555/? D/ImportDB: Data extracted for a column = 10
02-08 06:04:26.773 1555-1555/? D/ImportDB: Data extracted for a column = barcode
02-08 06:04:26.773 1555-1555/? D/ImportDB: Data extracted for a column = London
02-08 06:04:26.773 1555-1555/? D/ImportDB: Data extracted for a column = Tinned Foods
02-08 06:04:26.773 1555-1555/? D/ImportDB: Data extracted for a column = red beany like things in sauce
02-08 06:04:26.773 1555-1555/? D/ImportDB: Read in line :-
02-08 06:04:26.773 1555-1555/? D/ImportDB: Data extracted for a column = Yellow Fin Tuna 12g tin
02-08 06:04:26.773 1555-1555/? D/ImportDB: Data extracted for a column = 5.76
02-08 06:04:26.773 1555-1555/? D/ImportDB: Data extracted for a column = 100
02-08 06:04:26.773 1555-1555/? D/ImportDB: Data extracted for a column = 12
02-08 06:04:26.773 1555-1555/? D/ImportDB: Data extracted for a column = barcode
02-08 06:04:26.773 1555-1555/? D/ImportDB: Data extracted for a column = New York
02-08 06:04:26.773 1555-1555/? D/ImportDB: Data extracted for a column = Tinned Foods
02-08 06:04:26.773 1555-1555/? D/ImportDB: Data extracted for a column = fishy stuff
02-08 06:04:26.777 1555-1555/? V/ImportDB: Restore is successful
logDatabaseInfo 02-08 06:04:26.781 1555-1555/? D/SQLITE_CSU: DatabaseList Row 1 Name=main File=/data/data/examples.mjt.sqliteassethelperexample/databases/products
02-08 06:04:26.781 1555-1555/? D/SQLITE_CSU: Database Version = 1
02-08 06:04:26.781 1555-1555/? D/SQLITE_CSU: Table Name = android_metadata Created Using = CREATE TABLE android_metadata (locale TEXT)
02-08 06:04:26.785 1555-1555/? D/SQLITE_CSU: Table = android_metadata ColumnName = locale ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
02-08 06:04:26.785 1555-1555/? D/SQLITE_CSU: Table Name = products Created Using = CREATE TABLE products(_id INTEGER PRIMARY KEY, productname TEXT, productprice REAL, productquantity INTEGER, productsold INTEGER, productbarcode TEXT, productlocation TEXT, productcategory TEXT, productnote TEXT)
02-08 06:04:26.785 1555-1555/? D/SQLITE_CSU: Table = products ColumnName = _id ColumnType = INTEGER Default Value = null PRIMARY KEY SEQUENCE = 1
02-08 06:04:26.785 1555-1555/? D/SQLITE_CSU: Table = products ColumnName = productname ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
02-08 06:04:26.785 1555-1555/? D/SQLITE_CSU: Table = products ColumnName = productprice ColumnType = REAL Default Value = null PRIMARY KEY SEQUENCE = 0
02-08 06:04:26.785 1555-1555/? D/SQLITE_CSU: Table = products ColumnName = productquantity ColumnType = INTEGER Default Value = null PRIMARY KEY SEQUENCE = 0
02-08 06:04:26.785 1555-1555/? D/SQLITE_CSU: Table = products ColumnName = productsold ColumnType = INTEGER Default Value = null PRIMARY KEY SEQUENCE = 0
02-08 06:04:26.785 1555-1555/? D/SQLITE_CSU: Table = products ColumnName = productbarcode ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
02-08 06:04:26.785 1555-1555/? D/SQLITE_CSU: Table = products ColumnName = productlocation ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
02-08 06:04:26.785 1555-1555/? D/SQLITE_CSU: Table = products ColumnName = productcategory ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
02-08 06:04:26.785 1555-1555/? D/SQLITE_CSU: Table = products ColumnName = productnote ColumnType = TEXT Default Value = null PRIMARY KEY SEQUENCE = 0
logCursorData 方法02-08 06:04:26.785 1555-1555/? D/SQLITE_CSU: logCursorData Cursor has 2 rows with 9 columns.
02-08 06:04:26.785 1555-1555/? D/SQLITE_CSU: Information for row 1 offset=0
For Column _id Type is INTEGER value as String is 1 value as long is 1 value as double is 1.0
For Column productname Type is STRING value as String is Baked beans value as long is 0 value as double is 0.0
For Column productpriceType is FLOAT value as String is 12.56 value as long is 12 value as double is 12.56
For Column productquantity Type is INTEGER value as String is 50 value as long is 50 value as double is 50.0
For Column productsold Type is INTEGER value as String is 10 value as long is 10 value as double is 10.0
For Column productbarcode Type is STRING value as String is barcode value as long is 0 value as double is 0.0
For Column productlocation Type is STRING value as String is London value as long is 0 value as double is 0.0
For Column productcategory Type is STRING value as String is Tinned Foods value as long is 0 value as double is 0.0
For Column productnote Type is STRING value as String is red beany like things in sauce value as long is 0 value as double is 0.0
02-08 06:04:26.785 1555-1555/? D/SQLITE_CSU: Information for row 2 offset=1
For Column _id Type is INTEGER value as String is 2 value as long is 2 value as double is 2.0
For Column productname Type is STRING value as String is Yellow Fin Tuna 12g tin value as long is 0 value as double is 0.0
For Column productpriceType is FLOAT value as String is 5.76 value as long is 5 value as double is 5.76
For Column productquantity Type is INTEGER value as String is 100 value as long is 100 value as double is 100.0
For Column productsold Type is INTEGER value as String is 12 value as long is 12 value as double is 12.0
For Column productbarcode Type is STRING value as String is barcode value as long is 0 value as double is 0.0
For Column productlocation Type is STRING value as String is New York value as long is 0 value as double is 0.0
For Column productcategory Type is STRING value as String is Tinned Foods value as long is 0 value as double is 0.0
For Column productnote Type is STRING value as String is fishy stuff value as long is 0 value as double is 0.0
添加一行，导致Bad Row Skipped，如下所示： -
,,,,,,,
添加一行，导致Bad Row Skipped，如下所示： -
Bananas,,,bardcode,Oxford,Fresh produce,yellow bendy things
答案 1 :(得分：0)
我发现所有列都被复制到了包围的数据库（＆＃34;＆＃34;）。所以我将代码更改为：
.................................................
sqLite.beginTransaction();
try {
while ((line=buffer.readLine()) != null) {
String[] values = line.split(",");
if(values.length != 8)
continue;
for(int i = 0; i < values.length; i++)
values[i] = values[i].replace("\"", "");
ContentValues cv = new ContentValues();
cv.put(ProductContract.ProductEntry.COLUMN_PRODUCT_NAME,values[0]);
cv.put(ProductContract.ProductEntry.COLUMN_PRODUCT_PRICE, values[1].trim());
cv.put(ProductContract.ProductEntry.COLUMN_PRODUCT_QUANTITY, values[2].trim());
cv.put(ProductContract.ProductEntry.COLUMN_PRODUCT_SOLD, values[3].trim());
cv.put(ProductContract.ProductEntry.COLUMN_PRODUCT_BARCODE, values[4].trim());
cv.put(ProductContract.ProductEntry.COLUMN_PRODUCT_LOCATION, values[5].trim());
cv.put(ProductContract.ProductEntry.COLUMN_PRODUCT_CATEGORY, values[6].trim());
cv.put(ProductContract.ProductEntry.COLUMN_PRODUCT_NOTE, values[7].trim());
sqLite.insert(TABLE_NAME,null, cv);
Log.e("Inserted",cv.toString());
}
} catch (SQLException | IOException e) {
e.printStackTrace();
Log.e("Exception",e.getLocalizedMessage());
}
sqLite.setTransactionSuccessful();
sqLite.endTransaction();
successImportingFromCSV=true;
Log.v(LOG_TAG, "Restore is successful");
} catch (Exception e) {
successImportingFromCSV=false;
Log.e(LOG_TAG, "Failed to restore from csv " + e);
}
.................................................
现在它完美无缺