How many types of resultSet in java?
958854
here is a code to ge the available ResutSet types \n\nimport java.sql.Connection;\nimport java.sql.DatabaseMetaData;\nimport java.sql.DriverManager;\nimport java.sql.ResultSet;\nimport java.sql.Statement;\n\npublic class Main {\n  public static void main(String[] args) throws Exception {\n    Connection conn = getMySqlConnection();\n    System.out.println("Got Connection.");\n    Statement st = conn.createStatement();\n    st.executeUpdate("drop table survey;");\n    st.executeUpdate("create table survey (id int,name varchar(30));");\n    st.executeUpdate("insert into survey (id,name ) values (1,'nameValue')");\n\n    DatabaseMetaData meta = conn.getMetaData();\n\n    if (meta.supportsResultSetType(ResultSet.TYPE_FORWARD_ONLY)) {\n      System.out.println("type name=TYPE_FORWARD_ONLY");\n    }\n    if (meta.supportsResultSetType(ResultSet.TYPE_SCROLL_INSENSITIVE)) {\n      System.out.println("type name=TYPE_SCROLL_INSENSITIVE");\n    }\n    if (meta.supportsResultSetType(ResultSet.TYPE_SCROLL_SENSITIVE)) {\n      System.out.println("type name=TYPE_SCROLL_SENSITIVE");\n    }\n\n\n    st.close();\n    conn.close();\n  }\n\n  private static Connection getHSQLConnection() throws Exception {\n    Class.forName("org.hsqldb.jdbcDriver");\n    System.out.println("Driver Loaded.");\n    String url = "jdbc:hsqldb:data/tutorial";\n    return DriverManager.getConnection(url, "sa", "");\n  }\n\n  public static Connection getMySqlConnection() throws Exception {\n    String driver = "org.gjt.mm.mysql.Driver";\n    String url = "jdbc:mysql://localhost/demo2s";\n    String username = "oost";\n    String password = "oost";\n\n    Class.forName(driver);\n    Connection conn = DriverManager.getConnection(url, username, password);\n    return conn;\n  }\n\n  public static Connection getOracleConnection() throws Exception {\n    String driver = "oracle.jdbc.driver.OracleDriver";\n    String url = "jdbc:oracle:thin:@localhost:1521:caspian";\n    String username = "mp";\n    String password = "mp2";\n\n    Class.forName(driver); // load Oracle driver\n    Connection conn = DriverManager.getConnection(url, username, password);\n    return conn;\n  }\n}
300441
The JDBC API provides programmatic access from applications written in the Java programming language to standard SQL. At the time the JDBC 2.0 API was in development, the SQL99 specification was a moving target. SQL99 is now a published standard and includes features that are widely supported among DBMS vendors as well as features that only a few vendors support. The intent of the JDBC 3.0 API is to provide access to the subset of SQL99 features that are\nlikely to be widely supported within the next five years.\n\n\n\nThe JDBC 3.0 API introduces new material and changes in these areas:\n\n\n1 Savepoint support\nAdded the Savepoint interface, which contains new methods to set, release, or roll back a transaction to designated savepoints.\n\n2 Reuse of prepared statements by connection pools\nAdded the ability for deployers to control how prepared statements are pooled and reused by connections.\n\n3 Connection pool configuration Defined a number of properties for the ConnectionPoolDataSource interface.\nThese properties can be used to describe how pooledConnection objects created by DataSource objects should be pooled.\n\n4 Retrieval of parameter metadata\nAdded the interface ParameterMetaData, which describes the number, type and properties of parameters to prepared statements.\n\n5 Retrieval of auto-generated keys\nAdded a means of retrieving values from columns containing automatically generated values.\n\n6 Ability to have multiple open ResultSet objects\nAdded the new method getMoreResults(int), whichtakes an argument that specifies whether ResultSet objects returned by a Statement object should be closed before returning any subsequent ResultSet objects.
567069
make sure that the method ReturnBook is not a void but instead returns a boolean value.\n\nIf you want to follow the standard java naming conventions rename the method to "returnBook". Methods typically start with a small letter.\n\nkeep a bookmark to this page that contains all possible\njava compiler error messages for future reference:\n\nhttp://mindprod.com/jgloss/compileerrormessages.html
29979
c)\n\nExplanation:\n\n\nThe API documentation for Connection lists the following three prepareCall-methods:\n\n- prepareCall(String sql)\n- prepareCall(String sql, int resultSetType, int resultSetConcurrency)\n- prepareCall(String sql, int resultSetType, int resultSetConcurrency, int resultSetHoldability)\n\nOnly the second one matches one of the answer options.
707232
Accessing the database implementation in jsp/servlets needs mainly 4 steps to follow, they are,\n\nStep1 : Load the Database Driver\n                  ex: Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");\n\nStep2 : Establish  the Connection\n                 ex: Connection con = DriverManager.getConnection("jdbc:odbc:<dsn-name>","DBusernaem","<DB pwd>");\n\nStep3 : Create Statement\n                  ex: Statement st = con.createStatement();\n\nStep4 : Execute Statement and return the Result Set or Result   Set Count\n                  ex: ResultSet rs = st.executeQuery("SQLQuery");
20248
Yes you can, JDBC is only thru java thou...\n\nWithin Java using the JDBC drivers, you can access any datasource.
149857
A collection in any language is a container that will hold other objects.  Examples of container classes in Java are List, Map, Set.  These are actually implemented as interfaces, they just define the basic methods that are expected for each of the different types of collections.  Concrete implementations for each of these interfaces would be HashSet, ArrayList, LinkedList, HashMap, TreeMap, TreeSet (there are others, but these are the most popular).\n\nThe simple answer to your question in regards to whether an interface and a class are the same is NO.  An interface is a definition of methods.  A class is an implemetation of those and probably other methods.  The syntax for this in Java would look like:\n\nclass X implements Y\n\nWhere X is the implemetation of the Y interface.  That is exactly how the collection classes are implemented in the JDK, the class declaration for ArrayList follows:\n\npublic class ArrayList<E> extends AbstractList<E>\n        implements List<E>, RandomAccess, Cloneable, java.io.Serializable\n\nNow, keep in mind that you CAN use an interface to access an instance of a class (an object).  For example:\n\nList myList = new ArrayList();\n\nList is an interface, ArrayList is a class.  Actually this is the intention of interfaces, separation of model and implementation. You could use a LinkedList in your code if you wrote your code this way just by changing the line that declares myList and no other code would have to be touched:\n\nList myList = new LinkedList();
575021
It depends on the situation , because datareader is reliable when you are querying huge amount of data. \n\nA DataReader is a lean, mean access method that returns results as soon as they’re available, rather than waiting for the whole of the query to be populated like in Dataset. \n\nNow, there are times when only a DataSet will suffice. Often, you’ll need to serialize your results, or pass the query results on to the next tier of your application. In these cases, a collection is required, and the DataSet provides a well-supported mechanism for doing this.\n\nSo it depends on the circumstance.
70491
Connection Pool \n\nThe JDCConnectionPool.java class makes connections available to calling program in its getConnection method. This method searches for an available connection in the connection pool. If no connection is available from the pool, a new connection is created. If a connection is available from the pool, the getConnection method leases the connection and returns it to the calling program. \n\npublic synchronized Connection getConnection() \nthrows SQLException {\n\n  JDCConnection c;\n  for(int i = 0; i < connections.size(); i++) {\n     c = (JDCConnection)connections.elementAt(i);\n     if (c.lease()) {\n        return c;\n     }\n  }\n\n  Connection conn = DriverManager.getConnection(\nurl, user, password);\n  c = new JDCConnection(conn, this);\n  c.lease();\n  connections.addElement(c);\n  return c;\n}\n \n\n\nThe JDCConnection.java class represents a JDBC connection in the connection pool, and is essentially a wrapper around a real JDBC connection. The JDCConnection object maintains a state flag to indicate if the connection is in use and the time the connection was taken from the pool. This time is used by the ConnectionReaper.java class to identify hanging connections.
214490
I am not sure I completely understand, but from the sounds of it you want to add records to a recordset? If you need to do lots of manipulation to get them try method 1, if it is simply data from two tables use method 2:\n\n1)I like to use a temporary table, insert all your records with an insert into, then do whatever you gotta do to create more records in the table, then select to get the full recordset. This is nice when the new records require a lot of manipulations to figure out.\n\n2)If you just need to add two selects together use a union statement\n\nSELECT * FROM Table1\nUNION\nSELECT * FROM Table2
5062
JDBC Example\nThis is a simple code that shows how to use JDBC. It shows how to select data from the northwind database running on localhost to which we connect using USERNAME/PASSWORD login. This is the basic database operation. INSERT/UPDATE/DELETE are even simpler since they don't require looping through the result set. \n\n\nimport java.sql.*;\n\npublic class JDBCDemo {\n\n    public static void main( String[] args ) {\n        try {\n            // Connect to the database\n            Class.forName("org.gjt.mm.mysql.Driver");\n            String url = "jdbc:mysql://localhost/northwind";\n            Connection con = DriverManager.getConnection(url, "USERNAME", "PASSWORD");\n\n            // Execute the SQL statement\n            Statement stmt = con.createStatement();\n            ResultSet resultSet = stmt.executeQuery("SELECT * from customers");\n\n            System.out.println("Got results!");\n\n            // Loop thru all the rows\n            while( resultSet.next() ) {\n                String data = resultSet.getString( "CompanyName" );\n                System.out.println( data );\n            }\n\n            stmt.close();\n        }\n        catch( Exception e ) {\n            System.out.println(e.getMessage());\n            e.printStackTrace();\n        }\n    }\n}
74561
It's hard to tell exactly what you are asking, but it sound like what you are looking for is:\nSELECT Categories.field1, Categories.field2, ...SubCategories.field1, SubCategories.field2, ...\nFROM Categories INNER JOIN subCategories ON Categories .catID = SubCategories.catID\nORDER BY Categories.catID;\n\nWhen you walk through the recordset, you keep track of PreviousCatID. When the Categories.catID doesn't match the PreviousCatID, you print the Category data items before the subcategories and update the PreviousCatID. If CategoryID hasn't changed, you just print the subcategory items.
969293
http://www.databaseanswers.org/data_models/
1060571
Do you get an exception error?\n \nI would need to see the SQL statement to see what is wrong with it. If it is executing the query, but you dont see the changes, then there is something wrong with the SQL statement.
619166
Try using a datagrid. You can use SqlDataReader object and populate the datagrid.
743722
Hello,\nThe inner query, which is\n\nSELECT [Employee Information].FirstName, [Employee Information].LastName, Courses.CourseTitle, CoursesCompleted.CourseID\nFROM Courses INNER JOIN ([Employee Information] INNER JOIN CoursesCompleted ON [Employee Information].StudentID=Courses... ON Courses.CourseID=CoursesComple...\nWHERE (((CoursesCompleted.CourseID)=... THE COURSE NUMBER])))\n\nreturns a set of first names, last names, course titles and course id numbers; however you are checking whether >only< the first name and the last name of a particular employee is in that set. If I'm not mistaken, both sides of the 'NOT IN' clause should contain the same information. In this example, one side (outer query) contains the name of the employee, and the other side (inner query) contains the name of the employee + course information. \nTry this: in the second query select only the first and last name of the employee (not the course info) but keep the joins in the FROM clause.\n\nIf I had designed the tables, I would assign a unique id to each employee, just as courses have their unique course ids. It would have eased this task a lot.\n\nI know I sound confusing, but hope it helps
828970
dim db as database\ndim rs as recordset\ndim strSQL as string\ndim strA as string\ndim strB as string\ndim strC as string\n\nset db = currentDB\n\nstrSQL = "Select fieldA, fieldB, fieldC from Table1 where FieldD = fieldvalue"\n\nset rs = db.openrecordset(strSQL, dbOpenDynaSet)\n\nif not rs.EOF then\nstrA = rs!fieldA\nstrB = rs!fieldB\nstrC = rs!fieldC\n\nend if