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所以我一直在尝试查询表中的一些项目,但没有返回任何内容。我知道我的表中只有 3 个项目,但我的选择是有效属性,因此我可以得到一些东西。
表中我的工艺有五个属性,如果一个属性不存在,则表中为 0。我正在做类似“工艺品必须有 2,3,0,0,0 的查询,因为最后三个属性是 0。
但是,即使我的选择存在于表中,也没有返回任何内容。我不确定它为什么要这样做。
我将不胜感激任何帮助!
我的代码在这一行下面:
// To get data from DB by querying the items selected
public String getData(int firstSelection, int secondSelection, int thirdSelection,
int fourthSelection, int fifthSelection)
{
SQLiteDatabase db = dbHelper.getWritableDatabase();
String firstSelectionStr, secondSelectionStr, thirdSelectionStr, fourthSelectionStr, fifthSelectionStr;
firstSelectionStr = Integer.toString(firstSelection);
secondSelectionStr = Integer.toString(secondSelection);
thirdSelectionStr = Integer.toString(thirdSelection);
fourthSelectionStr = Integer.toString(fourthSelection);
fifthSelectionStr = Integer.toString(fifthSelection);
//String[] columns = {DBHelper.UID,DBHelper.CNAME};
//Cursor cursor = db.query(DBHelper.TABLE_NAME,columns,null,null,null,null,null);
String selectQuery = "SELECT * FROM "+ DBHelper.TABLE_NAME + " WHERE " + DBHelper.FIRST_ATTRIBUTE + "=? "
+ " AND " + DBHelper.SECOND_ATTRIBUTE + "=? " + " AND " + DBHelper.THIRD_ATTRIBUTE + "=? " + " AND " + DBHelper.FOURTH_ATTRIBUTE + "=? "
+ " AND " + DBHelper.FIFTH_ATTRIBUTE + "=?";
Cursor cursor=db.rawQuery(selectQuery, new String[] {firstSelectionStr, secondSelectionStr, thirdSelectionStr,
fourthSelectionStr, fifthSelectionStr});
StringBuilder buffer = new StringBuilder();
cursor.moveToFirst();
if (cursor != null) {
int tresult = cursor.getCount();
// Append every data together
do {
//int cursorID = cursor.getInt(cursor.getColumnIndex(DBHelper.UID));
String chosenItem = cursor.getString(cursor.getColumnIndex(DBHelper.CNAME));
buffer.append(chosenItem + " ");
} while (cursor.moveToNext());
/*while (cursor.moveToNext())
{
//int cursorID = cursor.getInt(cursor.getColumnIndex(DBHelper.UID));
String chosenItem = cursor.getString(cursor.getColumnIndex(DBHelper.CNAME));
buffer.append(chosenItem + " ");
}*/
}
return buffer.toString();
}
最佳答案
My crafts in the table have five attributes on them and if an attribute don't exist, it will be 0
public class DBHelper extends SQLiteOpenHelper {
public static final String DBNAME = "mydb";
public static final int DBVERSION = 1;
public static final String TABLE_NAME = "mytable";
public static final String TABLE_NAME2 = "mytable2";
public static final String UID = "uid";
public static final String CNAME = "cname";
public static final String FIRST_ATTRIBUTE = "a1";
public static final String SECOND_ATTRIBUTE = "a2";
public static final String THIRD_ATTRIBUTE = "a3";
public static final String FOURTH_ATTRIBUTE = "a4";
public static final String FIFTH_ATTRIBUTE = "a5";
SQLiteDatabase mDB;
public DBHelper(Context context) {
super(context, DBNAME, null, DBVERSION);
mDB = this.getWritableDatabase();
}
// Create both tables
@Override
public void onCreate(SQLiteDatabase db) {
String crt_tbl = "CREATE TABLE IF NOT EXISTS " + TABLE_NAME + "(" +
UID + " INTEGER PRIMARY KEY," +
CNAME + " TEXT, " +
FIRST_ATTRIBUTE + " INTEGER, " +
SECOND_ATTRIBUTE + " INTEGER," +
THIRD_ATTRIBUTE + " INTEGER, " +
FOURTH_ATTRIBUTE + " INTEGER, " +
FIFTH_ATTRIBUTE + " INTEGER" +
")";
db.execSQL(crt_tbl);
String crt_tbl2 = "CREATE TABLE IF NOT EXISTS " + TABLE_NAME2 + "(" +
UID + " INTEGER PRIMARY KEY," +
CNAME + " TEXT, " +
FIRST_ATTRIBUTE + " INTEGER DEFAULT 0, " +
SECOND_ATTRIBUTE + " INTEGER DEFAULT 0," +
THIRD_ATTRIBUTE + " INTEGER DEFAULT 0, " +
FOURTH_ATTRIBUTE + " INTEGER DEFAULT 0, " +
FIFTH_ATTRIBUTE + " INTEGER DEFAULT 0" +
")";
db.execSQL(crt_tbl2);
}
@Override
public void onUpgrade(SQLiteDatabase db, int i, int i1) {
}
// Generic Insert method
public long insertRow(String table, String cname, int[] attributes) {
String[] attribute_columns = new String[]{FIRST_ATTRIBUTE,SECOND_ATTRIBUTE,THIRD_ATTRIBUTE,FOURTH_ATTRIBUTE,FIFTH_ATTRIBUTE};
ContentValues cv = new ContentValues();
cv.put(CNAME,cname);
for (int i=0; i < attributes.length; i++) {
cv.put(attribute_columns[i],attributes[i]);
}
return mDB.insert(table,null,cv);
}
// Insert row into table 1 with all 5 attributes
public long insertRow(String cname,int a1, int a2, int a3, int a4, int a5) {
int[] attributes = new int[]{a1,a2,a3,a4,a5};
return insertRow(TABLE_NAME,cname,attributes);
}
// Inert row in table 1 with first 2 attributes
public long insertRow(String cname, int a1, int a2) {
int[] attributes = new int[]{a1,a2};
return insertRow(TABLE_NAME,cname,attributes);
}
// Insert row into table 2 with all 5 atributes
public long insertRow2(String cname,int a1, int a2, int a3, int a4, int a5) {
int[] attributes = new int[]{a1,a2,a3,a4,a5};
return insertRow(TABLE_NAME2,cname,attributes);
}
// Insert row into table 2 with first 2 attributes
public long insertRow2(String cname, int a1, int a2) {
int[] attributes = new int[]{a1,a2};
return insertRow(TABLE_NAME2,cname,attributes);
}
public void dumpTableToLog(String table) {
Log.d("DUMPTABLE","Dumping table ==>" + table);
Cursor csr = mDB.query(table,null,null,null,null,null,null);
DatabaseUtils.dumpCursor(csr);
csr.close();
}
}
public class MainActivity extends AppCompatActivity {
DBHelper dbHelper;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
dbHelper = new DBHelper(this);
//Example table 1 load data
dbHelper.getWritableDatabase().delete(DBHelper.TABLE_NAME,null,null); // Empty table
dbHelper.insertRow("Crafts", 2, 3, 0, 0, 0);
dbHelper.insertRow("Arts", 1, 1, 1, 1, 1);
dbHelper.insertRow("Science", 6, 3, 0, 0, 0);
dbHelper.insertRow("Maths", 2, 3, 0, 0, 0);
dbHelper.insertRow("Crafts2",2,3); //<<<<<<<<<< NULLS for a3-a5
dbHelper.dumpTableToLog(DBHelper.TABLE_NAME); // Dump all table 1 contents to the Log
Log.d("GETDATAREUSULT", getData(2, 3, 0, 0, 0));
Log.d("GETDATAREUSULT", getData(1, 3, 0, 0, 0));
//Example table 2 (with DEFAULT 0) (uses methods ending with 2)
dbHelper.getWritableDatabase().delete(DBHelper.TABLE_NAME,null,null); // Empty table
dbHelper.insertRow2("Crafts", 2, 3, 0, 0, 0);
dbHelper.insertRow2("Arts", 1, 1, 1, 1, 1);
dbHelper.insertRow2("Science", 6, 3, 0, 0, 0);
dbHelper.insertRow2("Maths", 2, 3, 0, 0, 0);
dbHelper.insertRow2("Crafts2",2,3); //<<<<<<<<<< NULLS for a3-a5
dbHelper.dumpTableToLog(DBHelper.TABLE_NAME2); // Dump all table 2 contents to the Log
Log.d("GETDATA2REUSULT", getData2(2, 3, 0, 0, 0));
Log.d("GETDATA2REUSULT", getData2(1, 3, 0, 0, 0));
}
// To get data from DB by querying the items selected
public String getData(int firstSelection, int secondSelection, int thirdSelection,
int fourthSelection, int fifthSelection) {
SQLiteDatabase db = dbHelper.getWritableDatabase();
String firstSelectionStr, secondSelectionStr, thirdSelectionStr, fourthSelectionStr, fifthSelectionStr;
firstSelectionStr = Integer.toString(firstSelection);
secondSelectionStr = Integer.toString(secondSelection);
thirdSelectionStr = Integer.toString(thirdSelection);
fourthSelectionStr = Integer.toString(fourthSelection);
fifthSelectionStr = Integer.toString(fifthSelection);
//String[] columns = {DBHelper.UID,DBHelper.CNAME};
//Cursor cursor = db.query(DBHelper.TABLE_NAME,columns,null,null,null,null,null);
String selectQuery = "SELECT * FROM " + DBHelper.TABLE_NAME + " WHERE " + DBHelper.FIRST_ATTRIBUTE + "=? "
+ " AND " + DBHelper.SECOND_ATTRIBUTE + "=? " + " AND " + DBHelper.THIRD_ATTRIBUTE + "=? " + " AND " + DBHelper.FOURTH_ATTRIBUTE + "=? "
+ " AND " + DBHelper.FIFTH_ATTRIBUTE + "=?";
Cursor cursor = db.rawQuery(selectQuery, new String[]{firstSelectionStr, secondSelectionStr, thirdSelectionStr,
fourthSelectionStr, fifthSelectionStr});
StringBuilder buffer = new StringBuilder();
while (cursor.moveToNext()) {
buffer.append(cursor.getString(cursor.getColumnIndex(DBHelper.CNAME))).append(" ");
}
cursor.close(); //<<<<<<<<<< Should always close cursor when done with it.
/*
cursor.moveToFirst(); //<<<<<<<<<< SHOULD ALWAYS CHECK result of move false if unable true if able to move
if (cursor != null) { //<<<<<<<<<< A cursor return from SQLiteDatabase meyhod will never be null, useless/dangerous
int tresult = cursor.getCount();
// Append every data together
do {
//int cursorID = cursor.getInt(cursor.getColumnIndex(DBHelper.UID));
String chosenItem = cursor.getString(cursor.getColumnIndex(DBHelper.CNAME));
buffer.append(chosenItem + " ");
} while (cursor.moveToNext());
}
*/
/*while (cursor.moveToNext())
{
//int cursorID = cursor.getInt(cursor.getColumnIndex(DBHelper.UID));
String chosenItem = cursor.getString(cursor.getColumnIndex(DBHelper.CNAME));
buffer.append(chosenItem + " ");
}*/
return buffer.toString();
}
/**
* Alternative using the convenience query method
* @param firstSelection
* @param secondSelection
* @param thirdSelection
* @param fourthSelection
* @param fifthSelection
* @return
*/
public String getData2(int firstSelection, int secondSelection, int thirdSelection,
int fourthSelection, int fifthSelection) {
SQLiteDatabase db = dbHelper.getWritableDatabase();
String whereclause = DBHelper.FIRST_ATTRIBUTE + "=? AND " +
DBHelper.SECOND_ATTRIBUTE + "=? AND " +
DBHelper.THIRD_ATTRIBUTE + "=? AND " +
DBHelper.FOURTH_ATTRIBUTE + "=? AND " +
DBHelper.FIFTH_ATTRIBUTE + "=?"
;
String[] whereargs = new String[]{
String.valueOf(firstSelection),
String.valueOf(secondSelection),
String.valueOf(thirdSelection),
String.valueOf(fourthSelection),
String.valueOf(fifthSelection)}
;
Cursor cursor = db.query(
DBHelper.TABLE_NAME2,
null,
whereclause,
whereargs,
null,null,null
);
StringBuilder buffer = new StringBuilder();
while (cursor.moveToNext()) {
buffer.append(cursor.getString(cursor.getColumnIndex(DBHelper.CNAME))).append(" ");
}
cursor.close(); //<<<<<<<<<< Should always close cursor when done with it.
return buffer.toString();
}
}
D/GETDATAREUSULT: Crafts Maths
; D/GETDATA2REUSULT: Crafts Maths Crafts2
12-01 01:09:12.140 1698-1698/? I/System.out: 4 {
12-01 01:09:12.140 1698-1698/? I/System.out: uid=5
12-01 01:09:12.140 1698-1698/? I/System.out: cname=Crafts2
12-01 01:09:12.140 1698-1698/? I/System.out: a1=2
12-01 01:09:12.140 1698-1698/? I/System.out: a2=3
12-01 01:09:12.140 1698-1698/? I/System.out: a3=null
12-01 01:09:12.140 1698-1698/? I/System.out: a4=null
12-01 01:09:12.140 1698-1698/? I/System.out: a5=null
12-01 01:09:12.140 1698-1698/? I/System.out: }
12-01 01:09:12.180 1698-1698/? I/System.out: 4 {
12-01 01:09:12.180 1698-1698/? I/System.out: uid=5
12-01 01:09:12.180 1698-1698/? I/System.out: cname=Crafts2
12-01 01:09:12.180 1698-1698/? I/System.out: a1=2
12-01 01:09:12.180 1698-1698/? I/System.out: a2=3
12-01 01:09:12.180 1698-1698/? I/System.out: a3=0
12-01 01:09:12.180 1698-1698/? I/System.out: a4=0
12-01 01:09:12.180 1698-1698/? I/System.out: a5=0
12-01 01:09:12.180 1698-1698/? I/System.out: }
12-01 01:09:12.140 1698-1698/? D/DUMPTABLE: Dumping table ==>mytable
12-01 01:09:12.140 1698-1698/? I/System.out: >>>>> Dumping cursor android.database.sqlite.SQLiteCursor@534b1f2c
12-01 01:09:12.140 1698-1698/? I/System.out: 0 {
12-01 01:09:12.140 1698-1698/? I/System.out: uid=1
12-01 01:09:12.140 1698-1698/? I/System.out: cname=Crafts
12-01 01:09:12.140 1698-1698/? I/System.out: a1=2
12-01 01:09:12.140 1698-1698/? I/System.out: a2=3
12-01 01:09:12.140 1698-1698/? I/System.out: a3=0
12-01 01:09:12.140 1698-1698/? I/System.out: a4=0
12-01 01:09:12.140 1698-1698/? I/System.out: a5=0
12-01 01:09:12.140 1698-1698/? I/System.out: }
12-01 01:09:12.140 1698-1698/? I/System.out: 1 {
12-01 01:09:12.140 1698-1698/? I/System.out: uid=2
12-01 01:09:12.140 1698-1698/? I/System.out: cname=Arts
12-01 01:09:12.140 1698-1698/? I/System.out: a1=1
12-01 01:09:12.140 1698-1698/? I/System.out: a2=1
12-01 01:09:12.140 1698-1698/? I/System.out: a3=1
12-01 01:09:12.140 1698-1698/? I/System.out: a4=1
12-01 01:09:12.140 1698-1698/? I/System.out: a5=1
12-01 01:09:12.140 1698-1698/? I/System.out: }
12-01 01:09:12.140 1698-1698/? I/System.out: 2 {
12-01 01:09:12.140 1698-1698/? I/System.out: uid=3
12-01 01:09:12.140 1698-1698/? I/System.out: cname=Science
12-01 01:09:12.140 1698-1698/? I/System.out: a1=6
12-01 01:09:12.140 1698-1698/? I/System.out: a2=3
12-01 01:09:12.140 1698-1698/? I/System.out: a3=0
12-01 01:09:12.140 1698-1698/? I/System.out: a4=0
12-01 01:09:12.140 1698-1698/? I/System.out: a5=0
12-01 01:09:12.140 1698-1698/? I/System.out: }
12-01 01:09:12.140 1698-1698/? I/System.out: 3 {
12-01 01:09:12.140 1698-1698/? I/System.out: uid=4
12-01 01:09:12.140 1698-1698/? I/System.out: cname=Maths
12-01 01:09:12.140 1698-1698/? I/System.out: a1=2
12-01 01:09:12.140 1698-1698/? I/System.out: a2=3
12-01 01:09:12.140 1698-1698/? I/System.out: a3=0
12-01 01:09:12.140 1698-1698/? I/System.out: a4=0
12-01 01:09:12.140 1698-1698/? I/System.out: a5=0
12-01 01:09:12.140 1698-1698/? I/System.out: }
12-01 01:09:12.140 1698-1698/? I/System.out: 4 {
12-01 01:09:12.140 1698-1698/? I/System.out: uid=5
12-01 01:09:12.140 1698-1698/? I/System.out: cname=Crafts2
12-01 01:09:12.140 1698-1698/? I/System.out: a1=2
12-01 01:09:12.140 1698-1698/? I/System.out: a2=3
12-01 01:09:12.140 1698-1698/? I/System.out: a3=null
12-01 01:09:12.140 1698-1698/? I/System.out: a4=null
12-01 01:09:12.140 1698-1698/? I/System.out: a5=null
12-01 01:09:12.140 1698-1698/? I/System.out: }
12-01 01:09:12.140 1698-1698/? I/System.out: <<<<<
12-01 01:09:12.144 1698-1698/? D/GETDATAREUSULT: Crafts Maths
12-01 01:09:12.176 1698-1698/? D/DUMPTABLE: Dumping table ==>mytable2
12-01 01:09:12.176 1698-1698/? I/System.out: >>>>> Dumping cursor android.database.sqlite.SQLiteCursor@534a1c1c
12-01 01:09:12.180 1698-1698/? I/System.out: 0 {
12-01 01:09:12.180 1698-1698/? I/System.out: uid=1
12-01 01:09:12.180 1698-1698/? I/System.out: cname=Crafts
12-01 01:09:12.180 1698-1698/? I/System.out: a1=2
12-01 01:09:12.180 1698-1698/? I/System.out: a2=3
12-01 01:09:12.180 1698-1698/? I/System.out: a3=0
12-01 01:09:12.180 1698-1698/? I/System.out: a4=0
12-01 01:09:12.180 1698-1698/? I/System.out: a5=0
12-01 01:09:12.180 1698-1698/? I/System.out: }
12-01 01:09:12.180 1698-1698/? I/System.out: 1 {
12-01 01:09:12.180 1698-1698/? I/System.out: uid=2
12-01 01:09:12.180 1698-1698/? I/System.out: cname=Arts
12-01 01:09:12.180 1698-1698/? I/System.out: a1=1
12-01 01:09:12.180 1698-1698/? I/System.out: a2=1
12-01 01:09:12.180 1698-1698/? I/System.out: a3=1
12-01 01:09:12.180 1698-1698/? I/System.out: a4=1
12-01 01:09:12.180 1698-1698/? I/System.out: a5=1
12-01 01:09:12.180 1698-1698/? I/System.out: }
12-01 01:09:12.180 1698-1698/? I/System.out: 2 {
12-01 01:09:12.180 1698-1698/? I/System.out: uid=3
12-01 01:09:12.180 1698-1698/? I/System.out: cname=Science
12-01 01:09:12.180 1698-1698/? I/System.out: a1=6
12-01 01:09:12.180 1698-1698/? I/System.out: a2=3
12-01 01:09:12.180 1698-1698/? I/System.out: a3=0
12-01 01:09:12.180 1698-1698/? I/System.out: a4=0
12-01 01:09:12.180 1698-1698/? I/System.out: a5=0
12-01 01:09:12.180 1698-1698/? I/System.out: }
12-01 01:09:12.180 1698-1698/? I/System.out: 3 {
12-01 01:09:12.180 1698-1698/? I/System.out: uid=4
12-01 01:09:12.180 1698-1698/? I/System.out: cname=Maths
12-01 01:09:12.180 1698-1698/? I/System.out: a1=2
12-01 01:09:12.180 1698-1698/? I/System.out: a2=3
12-01 01:09:12.180 1698-1698/? I/System.out: a3=0
12-01 01:09:12.180 1698-1698/? I/System.out: a4=0
12-01 01:09:12.180 1698-1698/? I/System.out: a5=0
12-01 01:09:12.180 1698-1698/? I/System.out: }
12-01 01:09:12.180 1698-1698/? I/System.out: 4 {
12-01 01:09:12.180 1698-1698/? I/System.out: uid=5
12-01 01:09:12.180 1698-1698/? I/System.out: cname=Crafts2
12-01 01:09:12.180 1698-1698/? I/System.out: a1=2
12-01 01:09:12.180 1698-1698/? I/System.out: a2=3
12-01 01:09:12.180 1698-1698/? I/System.out: a3=0
12-01 01:09:12.180 1698-1698/? I/System.out: a4=0
12-01 01:09:12.180 1698-1698/? I/System.out: a5=0
12-01 01:09:12.180 1698-1698/? I/System.out: }
12-01 01:09:12.180 1698-1698/? I/System.out: <<<<<
12-01 01:09:12.184 1698-1698/? D/GETDATA2REUSULT: Crafts Maths Crafts2
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所以,我想更改我公司的一个项目,以使用一些与 IDE 无关的设置。我在使用 Tomcat 设置 Java 应用程序方面有非常少的经验(我几乎不记得它是如何工作的)。 因此,为了帮助制作独立于 IDE
我有 2 个独立的项目,一个在 Cocos2dx v3.6 中,一个在 Swift 中。我想从 Swift 项目开始游戏。我该怎么做? 我已经将整个 cocos2dx 项目复制到我的 Swift 项目
Cordova 绝对是新手。这些是我完成的步骤: checkout 现有项目 运行cordova build ios 以上生成此构建错误: (node:10242) UnhandledPromiseR
我正在使用 JQuery 隐藏/显示 li。我的要求是,当我点击任何 li 时,它应该显示但隐藏所有其他 li 项目。当我将鼠标悬停在文本上时 'show all list item but don
我想将我所有的java 项目(223 个项目)迁移到gradle 项目。我正在使用由 SpringSource STS 团队开发的 Gradle Eclipse 插件。 目前,我所有的 java 项目
我下载this Eclipse Luna ,对于 Java EE 开发人员,如描述中所见,它支持 Web 应用程序。我找不到 file -> new -> other -> web projects
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