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Java Articles
Page 385 of 450
Java ResultSetMetaData getColumnTypeName() method with example
The getColumnTypeName() method of the ResultSetMetaData (interface) retrieves and returns the name of the datatype of the specified column in the current ResultSet object.This method accepts an integer value representing the index of a column and, returns a String value representing the name of the SQL data type of the specified column.To get the ResultSetMetaData object, you need to −Register the Driver: Select the required database register the Driver class of the particular database using the registerDriver() method of the DriverManager class or, the forName() method of the class named Class.DriverManager.registerDriver(new com.mysql.jdbc.Driver());Get connection: Create a connection object by passing the URL ...
Read MoreJava ResultSetMetaData getColumnType() method with example
The getColumnType() method of the ResultSetMetaData (interface) retrieves the type of the specified column in the current ResultSet object.This method accepts an integer value representing the index of a column and, returns an integer value representing the SQL type of the specified column.Following is the list of values returned by various datatypes of java.sql.Type −Array: 2003Big int: -5Binary: -2Bit: -7Blob: 2004Boolean: 16Char: 1Clob: 2005Date: 91Datalink70Decimal: 3Distinct: 2001Double: 8Float: 6Integer: 4JavaObject: 2000Long var char: -16Nchar: -15NClob: 2011Varchar: 12VarBinary: -3Tiny int: -6Time stamt with time zone: 2014Timestamp: 93Time: 92Struct: 2002SqlXml: 2009Smallint: 5Rowid: -8Refcursor: 2012Ref: 2006Real: 7Nvarchar: -9Numeric: 2Null: 0Smallint: 5To get the ResultSetMetaData ...
Read MoreJava ResultSetMetaData isAutoIncrement() method with example
The is AutoIncrement() method of the ResultSetMetaData (interface) determines whether a particular column in the current ResultSet object is automatically numbered.This method accepts an integer value representing the index of a column and, returns a boolean value which is −True, if the specified column is automatically numbered.False, if the specified column is not automatically numbered.To get the ResultSetMetaData object, you need to −Register the Driver: Select the required database register the Driver class of the particular database using the registerDriver() method of the DriverManager class or, the forName() method of the class named Class.DriverManager.registerDriver(new com.mysql.jdbc.Driver());Get connection: Create a connection object by ...
Read MoreJava DatabaseMetaData supportsTransactions() method with example
The supportsTransactions() method of the DatabaseMetaData interface is used to determine whether the underlying database supports transactions.This method returns a boolean value which is −True, when the underlying database supports stored procedures.False, when the underlying database doesn't support stored procedures.To determine whether the underlying database supports stored procedures−Make sure your database is up and running.Register the driver using the registerDriver() method of the DriverManager class. Pass an object of the driver class corresponding to the underlying database.Get the connection object using the getConnection() method of the DriverManager class. Pass the URL the database and, user name, password of a user ...
Read MoreWhat are the transaction isolation levels supported by JDBC API?
JDBC provides support 5 transaction isolation levels through Connection interface.TRANSACTION_NONE: It is represented by integer value 0 does not support transactions.TRANSACTION_READ_COMMITTED: It is represented by integer value 2 supports transactions allowing Non-Repeatable Reads and, Phantom Reads.TRANSACTION_READ_UNCOMMITTED: It is represented by integer value 1 supports transactions allowing Dirty Reads, Non-Repeatable Reads and, Phantom Reads.TRANSACTION_REPEATABLE_READ: It is represented by integer value 4 supports transactions allowing only Phantom Reads.TRANSACTION_SERIALIZABLE: It is represented by integer value 8 supports transactions with out allowing Dirty Reads, Non-Repeatable Reads and, Phantom Reads.Following JDBC example displays all the transactions levels provided by the Connection interface of the JDBC ...
Read MoreJava DatabaseMetaData supportsTransactionIsolationLevel() method with example
JDBC provides support 5 transaction isolation levels through Connection interface.TRANSACTION_NONE: It is represented by integer value 0 does not support transactions.TRANSACTION_READ_COMMITTED: It is represented by integer value 2 supports transactions allowing Non-Repeatable Reads and, Phantom Reads.TRANSACTION_READ_UNCOMMITTED: It is represented by integer value 1 supports transactions allowing Dirty Reads, Non-Repeatable Reads and, Phantom Reads.TRANSACTION_REPEATABLE_READ: It is represented by integer value 4 supports transactions allowing only Phantom Reads.TRANSACTION_SERIALIZABLE: It is represented by integer value 8 supports transactions with out allowing Dirty Reads, Non-Repeatable Reads and, Phantom Reads.The supportsTransactionIsolationLevel() method of the DatabaseMetaData interface is used to determine whether the underlying database supports ...
Read MoreJava Connection getCatalog() method with example
In general, a catalog is a directory which holds information about data sets, file or, a database. Whereas in a database catalog holds the list of all the databases, base tables, views (virtual tables), synonyms, value ranges, indexes, users, and user groups.The getCatalog() method of the Connection interface returns the name of the current catalog/database, of the current connection object.This method returns a Sting value representing the name of the catalog. It returns null if there is no catalog.To get the catalog name −Register the driver using the registerDriver() method of the DriverManager class as −//Registering the Driver DriverManager.registerDriver(new com.mysql.jdbc.Driver());Get the connection ...
Read MoreJava DatabaseMetaData supportsResultSetConcurrency() method with example
While creating a Statement object you can choose the concurrency and the type of the ResultSet object using the following variant of the createStatement() method −Statement createStatement(int resultSetType, int resultSetConcurrency)ResultSet ConcurrencyThe concurrency of the ResultSet object determines whether its contents can be updated or not.The ResultSet interface provides two values to specify the concurrency namely −CONCUR_READ_ONLY: If you set this as a value of the concurrency while creating the ResultSet object you cannot update the contents of the ResultSet you can only read/retrieve them.CONCUR_UPDATABLE: If you set this as a value of the concurrency while creating the ResultSet object you can update ...
Read MoreJava DatabaseMetaData supportsResultSetType() method with example
While creating a Statement object you can choose the concurrency and the type of the ResultSet object using the following variant of the createStatement() method −Statement createStatement(int resultSetType, int resultSetConcurrency)ResultSet ConcurrencyThe concurrency of the ResultSet object determines whether its contents can be updated or not.The ResultSet interface provides two values to specify the concurrency namely −CONCUR_READ_ONLY: If you set this as a value of the concurrency while creating the ResultSet object you cannot update the contents of the ResultSet you can only read/retrieve them.CONCUR_UPDATABLE: If you set this as a value of the concurrency while creating the ResultSet object you ...
Read MoreJava DatabaseMetaData supportsUnion() method with example.
The SQL UNION clause/operator is used to combine the results of two or more SELECT statements without returning any duplicate rows.To use this UNION clause, each SELECT statement must haveThe same number of columns selectedThe same number of column expressionsThe same data type andHave them in the same orderBut they need not have to be in the same length.The basic syntax of a UNION clause is as follows −SyntaxSELECT column1 [, column2 ] FROM table1 [, table2 ] [WHERE condition] UNION SELECT column1 [, column2 ] FROM table1 [, table2 ] [WHERE condition]The supportsUnion() method of the DatabaseMetaData interface is used to ...
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