I want to fetch record according to item_name..but it gives sql exception no such column: Roti exist.
query of my code is there
db.query(TABLE_1, new String[] { KEY_ITEM_CALORIES }, KEY_ITEM_NAME + "=" + item_name, null, null, null, null, null);
whats is the problem in this query?
you can make like that
Cursor mCursor=db.query(tablename, new String[] {"columnname1","columnname2"},"KEY_ITEM_NAME=?",new String[] { item_name }, null, null,null);
Try this
`Cursor cursor = db.rawQuery
("select * from Table_Name where Column_Name ='"+ value +"'", null)
Related
I am using query for search but i don't understand why one code is work and another one not work ?!
this is working:
String selectQuery = "SELECT * FROM " + TABLE_Soras
+" WHERE "+KEY_SoraName+" LIKE '%"+soraName+"%'";
Cursor cursor = db.rawQuery(selectQuery,null);
but this isn't get any result:
Cursor cursor = db.query(TABLE_Soras, new String[]{
KEY_SORA_NO, KEY_SoraName}, KEY_SoraName + "=?",
new String[]{soraName}, null, null, null, null);*/
Because in second case % is not appended into value and you didn't add LIKE clause into query. You need to use this:
KEY_SoraName + " like ?", new String[] {"%" +soraName + "%"} ...
Try this
Cursor cursor = db.query(TABLE_QuranSoras, new String[]{
KEY_SORA_NO, KEY_SoraName}, KEY_SoraName+" LIKE '%"+soraName+"%'", null, null, null, null);
Cursor cursor = your_database.query(MY_TABLE, new String[] {"first_column","second_column"},your_column + " LIKE '%"+your_criteria+"%'", null, null, null, null);
Try something like this and it will probably work!
I am using a content provider and need to query a table where one column of the row = thing1 and another column of that same row = thing2.
i know you can query a table for just one condition like:
Cursor c = contentResolver.query(content_uri, projection, variable + "='" + thing1 + "'", null, null);
now how can i query for two conditions? any help would be appreciated.
This should work:
Cursor c = contentResolver.query(content_uri, projection, "col1=? AND col2=?", args, null);
where args is a String[] of values to substitute in for the ? in the query.
Try this
Cursor c = contentResolver.query(content_uri, projection, variable + "='" + thing1 + "' AND "+variable2 + "='"+thing2+"'" , null, null);
My cursor is returning records twice even though I set the distinct to true:
return myDataBase.query(true, DB_TABLE, new String[]
{"rowid as _id", KEY_CONDITIONS}, builder.toString(), symptoms, null, null, null, null);
FYI,
public Cursor getData(String[] symptoms) {
String where = KEY_SYMPTOMS + "= ?";
String orStr = " OR ";
StringBuilder builder = new StringBuilder(where);
for(int i = 1; i < symptoms.length; i++)
builder.append(orStr).append(where);
return myDataBase.query(true, DB_TABLE, new String[]
{"rowid as _id", KEY_CONDITIONS}, builder.toString(), symptoms, null, null, null, null);
}
Or I tried to change to rawQuery
return myDataBase.rawQuery("SELECT DISTINCT " + KEY_CONDITIONS + " FROM "
+ DB_TABLE + " " + builder.toString() + symptoms.toString(), null);
My LogCat says:
03-02 22:57:02.634: E/AndroidRuntime(333): FATAL EXCEPTION: main
03-02 22:57:02.634: E/AndroidRuntime(333): android.database.sqlite.SQLiteException: near "=": syntax error: , while compiling: SELECT DISTINCT conditions FROM tblSymptoms symptoms= ? OR symptoms= ?[Ljava.lang.String;#405550f8
Please help me identify what seems to be missing in here. Any help is truly appreciated.
Solution
You want DISTINCT conditions but Android requires the _id column which is a problem because you cannot mix and match: SELECT _id, DISTINCT condition.... However you can use the GROUP BY clause instead:
return myDataBase.query(DB_TABLE, new String[] {"rowid as _id", KEY_CONDITIONS},
builder.toString(), symptoms, KEY_CONDITIONS, null, null);
Explanations
This query:
return myDataBase.rawQuery("SELECT DISTINCT " + KEY_CONDITIONS + " FROM "
+ DB_TABLE + " " + builder.toString() + symptoms.toString(), null);
Failed because you are passing String[] symptoms in the wrong parameter, try:
return myDataBase.rawQuery("SELECT DISTINCT " + KEY_CONDITIONS + " FROM "
+ DB_TABLE + " " + builder.toString(), symptoms);
This query:
return myDataBase.query(true, DB_TABLE, new String[] {"rowid as _id", KEY_CONDITIONS}, builder.toString(), symptoms, null, null, null, null);
Failed because DISTINCT is looking at both the id and condition columns. It is the equivalent of: SELECT DISTINCT(_id, conditions) ... You, obviously, only want distinct conditions...
you have two general option two do this Task
use row query **and
**use DISTINCT keyword
for using row query you can directly use function of mr.Sam
and for using DISTINCT keyword you can use
public Cursor query (boolean distinct, String table, String[] columns,
String selection, String[] selectionArgs, String groupBy,
String having, String orderBy, String limit)
because query stucher is retunsthis:
query(false, table, columns, selection, selectionArgs, groupBy,
having, orderBy, null /* limit */);
in this code first arg is for DISTINCT so provide it as true.
so your query will like this
Cursor cursor = db.query(true, YOUR_TABLE_NAME, new String[] { COLUMN1 ,COLUMN2, COLUMN_NAME_3 }, null, null, COLUMN2, null, null, null);
BasicallyDISTINCT keyword returns a column name only once if it apperase more then one time.
How can I get the minimum value of an database column?
I need to find the minimum _id of a SQLite table.
I tried the following, but had no success:
Cursor c = db.query(MY_DATABASE_TABLE_LAST_REQUEST, new String[] { "min(" + KEY_ROWID + ")" }, null, null,
null, null, null);
int rowID = c.getInt(0);
What am I doing wrong?
Make sure you call moveToFirst before getting the value:
Cursor c = db.query(MY_DATABASE_TABLE_LAST_REQUEST, new String[] { "min(" + KEY_ROWID + ")" }, null, null,
null, null, null);
c.moveToFirst(); //ADD THIS!
int rowID = c.getInt(0);
I've got an android app using a local sqlite database.
private SQLiteDatabase mDb;
when I run this query I get my Cursor over rows with pid equal to id, as desired:
mDb.query(true, PT_TABLE, new String[] {KEY_PID, KEY_TID},
KEY_PID+" = "+id, null, null, null, null, null);
when I run the following query, aiming to get that same result set, ordered by pid I get "android.database.sqlite.SQLiteException: datatype mismatch"
mDb.query(true, PT_TABLE, new String[] {KEY_PID, KEY_TID},
KEY_PID+" = "+id, null, null, null, null, KEY_PID+" DESC");
Any ideas?
It looks like you got just a little mixed up. According to the SQLiteDatabase.query documentation, the last argument is the LIMIT clause. The second to last is the ORDER BY clause.
Cursor query (boolean distinct,
String table,
String[] columns,
String selection,
String[] selectionArgs,
String groupBy,
String having,
String orderBy, // <-- ORDER BY
String limit)
EDIT
But, there is also another SQLiteDatabase.query where ORDER BY would be last
Cursor query (String table,
String[] columns,
String selection,
String[] selectionArgs,
String groupBy,
String having,
String orderBy)
This worked for me
String filter = MySQLiteHelper.JOB_ID + "=" + Integer.toString(jobID);
String orderBy = MySQLiteHelper.LOG_TIME + " DESC";
Cursor cursor = database.query(MySQLiteHelper.LOG_TABLE_NAME, logTableColumns,
filter, null, null, null, orderBy);
KEY_PID + " = " + "'" + id + "'"
Since Orderby is the second last parameter in the query;
your query would be like this
mDb.query(true, PT_TABLE, new String[] {KEY_PID, KEY_TID},
KEY_PID+" = "+id, null, null, null, KEY_PID+" DESC", null);
If I correctly understood your problem, try this.
String[] columns = new String[] {KEY_PID, KEY_TID};
String where = KEY_PID + " = " + Integer.toString(id);
String orderBy = KEY_PID + " DESC";
Cursor cursor = mDb.query(PT_TABLE, columns, where, null, null, null, orderBy);