I have an app that allows users to store an int value for 50 different symptoms once per day. So in my SQLite db, my primary key is the symptom and the date (see below).
String CREATE_TABLE_SYMPTOM = "CREATE TABLE " + Symptom.TABLE + "("
+ Symptom.KEY_Symptom + " INTEGER NOT NULL , "
+ Symptom.KEY_date + " INTEGER NOT NULL , "
+ Symptom.KEY_level + " INTEGER , "
+ "PRIMARY KEY ( " + Symptom.KEY_Symptom + " , " + Symptom.KEY_date + " ))";
My table with have 50 entries per day which is alot.
Is there a more efficient way of breaking up this table so I won't have so many entries? I
Related
I have Created a database with this code Some days ago
sql = "Create Database if not exists My_Test_Project";
stmnt.executeUpdate(sql);
And Created Some tables at that time. Now I'm creating two new tables in it one with this query
sql = "CREATE TABLE if not exists My_Test_Project.Sales_Invoice_Help "
+ "(inv_help_id INTEGER,"
+ "item VARCHAR(255),"
+ "qty INTEGER,"
+ "rate DECIMAL (7, 2),"
+ "total DECIMAL (7, 2),"
+ "sale_inv_id INTEGER,"
+ " PRIMARY KEY (inv_help_id),FOREIGN KEY (sale_inv_id) REFERENCES Sales_Invoice (sale_inv_id))";
stmnt.executeUpdate(sql);
And when I Executed my program it throw Exception
SEVERE: null
java.sql.SQLException: No database selected
But at the same time this query executed successfully
sql = "CREATE TABLE if not exists My_Test_Project.Sales_Invoice "
+ "(sale_inv_id INTEGER not NULL, "
+ "date VARCHAR(255), "
+ "acc_name VARCHAR(255),"
+ "due_date VARCHAR(255),"
+ "customer_name VARCHAR(255),"
+ "receipt_no VARCHAR(255),"
+ "freight_charges INTEGER,"
+ "deliver_to VARCHAR(255),"
+ "deliver_date VARCHAR(255),"
+ "total INTEGER,"
+ "discount INTEGER,"
+ "g_total INTEGER ,"
+ " PRIMARY KEY (sale_inv_id))";
stmnt.executeUpdate(sql);
Note: Sales_Invoice table is first in sequence and in code too.
I do not know why its throwing exception. Can you please guide me.
I would believe in this line you will need to add the Database name:
REFERENCES Sales_Invoice (sale_inv_id)
So it should now be:
REFERENCES My_Test_Project.Sales_Invoice (sale_inv_id)
I have an application that works well. But I suspect that I can improve it if I optimize queries to the database. And I need suggestions.
This is part of my "select query":
private static final String SELECT = "SELECT " +
"dz.first_id AS first_id, " +
"dz._id AS _id, " +
"dz.att1 AS att1, " +
"dz.att2 AS att2, " +
"dz.att3 AS att3, " +
"dz.att4 AS att4, " +
"dz.att5 AS att5, " +
"d.var1 AS var1, " +
"d.name AS name, " +
"d.last_update AS last_update, " +
"d.image_url AS image_url, " +
"d.image_highlighted_url AS image_highlighted_url, " +
"d.var2 AS var2, " +
"d.type AS type, " +
"d.state AS state, " +
"d.sync AS sync, " +
"d.var3 AS var3 " +
"FROM table1 dz INNER JOIN table2 d " +
"ON d._id = dz.first_id ";
Cursor result = conn.rawQuery(SELECT, null);
*table1 and table2 have simple creation: only one _id integer PRIMARY KEY AUTOINCREMENT NOT NULL
It is useful to use views? Any other suggestion?
Thanks.
This query looks as cut and dry and they can get, I think your options are really either to see if you can somehow leave some unnecessary columns out of your select or alternatively to see that both dz.first_id and d._id have indexes setup. Perhaps add a index to dz with the following
CREATE INDEX index1 ON table1 (first_id);
I have some problems with an application developed in Java that uses postgreSQL as a DB. I managed to make a dummy query as follows:
String sql = "INSERT INTO voicemessages (UNIQUEID,MSGNM,DIR,CONTEXT,MACROCONTEXT,CALLERID, ORIGTIME,DURATION, FLAG,MAILBOXUSER,MAILBOXCONTEXT,RECORDING, LABEL, read ) "
+ "VALUES (1, 1, 'dir/dir1/msgs', 'message', 'message', '6001', '15/01/2015 13:31:25', '1:32', 'flag', 'Georgi Georgiev', 'Georgi Georgiev', '12314124', 'some label', false);";
And it works perfect when I execute the statement. A row in the DB is created and I am able to display the data using:
SELECT * FROM voicemessages;
The problem is when I create my own VoiceMail class and when I create an object from this type and put in the query the getters and setters for this object I receive some kind of an error:
org.postgresql.util.PSQLException: ERROR: column "dir" does not exist Hint:There is a column named "dir" in table "voicemessages", but it cannot be referenced from this part of the query.Position: 169
I am trying to insert a row by using and executing this:
String sql = "INSERT INTO voicemessages (UNIQUEID,MSGNM,DIR,CONTEXT,MACROCONTEXT,CALLERID, ORIGTIME,DURATION, FLAG,MAILBOXUSER,MAILBOXCONTEXT,RECORDING, LABEL, read ) "
+ "VALUES (" + message01.getUniqueId() + ", " + message01.getMessageNumber() + ", " + message01.getDirectory() + ", " + message01.getContext() + ", " + message01.getMacroContext() + ", " + message01.getCallerId() + ", " +message01.getOrigTime() + ", " + message01.getDuration() + ", " + message01.getFlag() + ", " + message01.getMailboxUser() + ", " +message01.getMailboxContext() + ", " + message01.getRecording() + ", " + message01.getLabel() + ", " + message01.getRead()+ ");"+" ";
Any help or suggestion is appreciated.
Thank you in advance!
Do not use Direct values use parameters for safety, What happens is that the SQL statement you pass is parsed to prepare and compiled by the database. So by sending the actual SQL separately from the parameters, you limit the risk of SQL injection
I'm having some problems reading what the actual SQL query is behind all this java code. This is just an example, though.
Is there an easy way to get the actual string behind this in Android Studio? It's really just a hard-coded string, after all.
private static final String CREATE_TABLE_ARTICLES = "CREATE TABLE " +
TABLE_ARTICLES + "(" + ARTICLES_KEY_ID + " INTEGER PRIMARY KEY, " +
ARTICLES_KEY_NAME + " TEXT, "+ ARTICLES_KEY_PERCENT_FAT + " INTEGER, " +
ARTICLES_KEY_PRICE + " INTEGER, " +
ARTICLES_KEY_SALES_START + " TEXT, " + ARTICLES_KEY_SALES_STOP + " TEXT, " +
ARTICLES_KEY_VOLUME + " INTEGER, " + ARTICLES_KEY_PRODUCT_GROUP + " TEXT)";
I usually use Log.i or Log.d to print out SQL commands to the console for better readability. If you make the string public (temporarily) you can call it from your main activity.
Log.i("SQLTEST", "create_table command: " + YourClass.CREATE_TABLE_ARTICLES);
I'm having an issue inputting information into a Sqlite database on the app I'm creating. I was using the help of the Cursor before. I am used to MySQL although clearly not 'used to' that well.
I am trying to add to the database from a file. I had this working before but it would be added with the Cursor. I was then told that in order to make it so I could add new information to the file and have the app ONLY add the new information into the database I should use INSERT OR IGNORE.
Is this the correct syntax? I currently am not having any information inserted for whatever reason...
ourDatabase.rawQuery("INSERT OR IGNORE INTO " + DATABASE_TABLE + " ("+KEY_CLASS+",
" + KEY_QUESTION+ ") VALUES ('" + qclass + "', '" + question + "');", null);
This is my database:
"CREATE TABLE " + DATABASE_TABLE + " (" +
KEY_ROWID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
KEY_CLASS + " TEXT NOT NULL, " +
KEY_QUESTION + " TEXT NOT NULL UNIQUE);
Thanks for the help in advance!
Your query seems right but try the one below anyway
ContentValues insertValues = new ContentValues();
insertValues.put(KEY_CLASS, qclass);
insertValues.put(KEY_QUESTION, question);
yourDbName.insertWithOnConflict(DATABASE_TABLE, null, insertValues, SQLiteDatabase.CONFLICT_IGNORE);
KEY_QUESTION + " TEXT NOT NULL UNIQUE);";