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JDBC Articles
Page 13 of 22
Java ResultSetMetaData getColumnName() method with example
The getColumnName() method of the ResultSetMetaData (interface) retrieves and returns the name 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 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 of the database, username and password of a ...
Read MoreHow to get the table name of the current ResultSet using JDBC?
You can get the name of the table in the current ResultSet object using the getTableName() method of the ResultSetMetaData interface. This method accepts an integer value representing the index of a column and, returns a String value representing the name of the table that contains the given column.Let us create a table with name MyPlayers in MySQL database using CREATE statement as shown below −CREATE TABLE MyPlayers( ID INT, First_Name VARCHAR(255), Last_Name VARCHAR(255), Date_Of_Birth date, Place_Of_Birth VARCHAR(255), Country VARCHAR(255), PRIMARY KEY (ID) );Now, we will insert 7 records in MyPlayers table using INSERT statements −insert into ...
Read MoreJDBC Class.forName vs DriverManager.registerDriver
To connect with a database using JDBC you need to select get the driver for the respective database and register the driver. You can register a database driver in two ways −Using Class.forName() method − The forName() method of the class named Class accepts a class name as a String parameter and loads it into the memory, Soon the is loaded into the memory it gets registered automatically.Class.forName("com.mysql.jdbc.Driver");ExampleFollowing JDBC program establishes connection with MySQL database. Here, we are trying to register the MySQL driver using the forName() method.import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; public class RegisterDriverExample { public static ...
Read MoreHow to get the row count from ResultSet in JDBC
Whenever we execute SQL statements using the executeQuery() method, it returns a ResultSet object which holds the tabular data returned by the SELECT queries(in general). The ResultSet object contains a cursor/pointer which points to the current row. Initially this cursor is positioned before first row (default position).The ResultSet interface provides various methods to find, the no.of columns, name of the column, type of the column etc.. but, it does not provides any method to find the number of rows in a table directly.Using count(*) function in the SELECT query you can get the number of rows in a table as −select ...
Read MoreHow to get Row and Column Count from ResultSet in JDBC
Row countThe last() method of the ResultSet interface moves the cursor to the last row of the ResultSet and, the getRow() method returns the index/position of the current row.Therefore, to get the number of rows move the cursor to the last row using the last() method and get the position of that (last) row using the getRow() method.Let us create a table with name MyPlayers in MySQL database using CREATE statement as shown below −CREATE TABLE MyPlayers( ID INT, First_Name VARCHAR(255), Last_Name VARCHAR(255), Date_Of_Birth date, Place_Of_Birth VARCHAR(255), Country VARCHAR(255), PRIMARY KEY (ID) );Now, we will insert 7 records in ...
Read MoreHow to generate multiple insert queries via java?
JDBC provides a mechanism known as batch processing, in which you can group a set of INSERT or, UPDATE or, DELETE commands (those produce update count value) and execute them at once. You can insert multiple records in to a table using this.Adding statements to the batchStatement, PreparedStatement and CallableStatement objects hold a list (of commands) to which you can add related statements (those return update count value) using the addBatch() method.stmt.addBatch(insert1); stmt.addBatch(insert2); stmt.addBatch(insert3);Executing the batchAfter adding the required statements, you can execute a batch using the executeBatch() method of the Statement interface.stmt.executeBatch();Using batch updates, we can reduce the communication ...
Read MoreIs it mandatory to register the driver while working with JDBC?
Initially, till Java6 it is needed to register the driver using Class.forname() or the registerDriver() method before establishing connection with the database.But, since Java 1.6, JDBC 4.0 API, there is no need to register the driver explicitly, You Just need to set the Class path for the JDBC 4.X driver, Java automatically detects the Driver class and loads it.ExampleIn the following JDBC program we are trying connect with MySQL database first of all include the dependency for the MySQL driver in the pom.xml of your project. mysql mysql-connector-java 8.0.16 Then, without registering the MySQL driver class com.mysql.jdbc.Driver ...
Read MoreHow to retrieve a record from an existing table in oracle database using JDBC API?
You can update/modify the existing contents of a record in a table using the UPDATE query. Using this you can update all the records of the table or specific records.SyntaxUPDATE table_name SET column1 = value1, column2 = value2...., columnN = valueN WHERE [condition];To update the contents of a record in a table using JDBC API you need to −Register the Driver: Register the driver class using the registerDriver() method of the DriverManager class. Pass the driver class name to it, as parameter.Establish a connection: Connect to the database using the getConnection() method of the DriverManager class. Passing URL (String), username (String), password (String) ...
Read MoreHow to remove a record from an existing table in oracle database using JDBC API?
You can remove a particular record from a table in a database using the DELETE query.SyntaxDELETE FROM table_name WHERE [condition];To delete a record from a table using JDBC API you need to −Register the Driver: Register the driver class using the registerDriver() method of the DriverManager class. Pass the driver class name to it, as parameter.Establish a connection: Connect to the database using the getConnection() method of the DriverManager class. Passing URL (String), username (String), password (String) as parameters to it.Create Statement: Create a Statement object using the createStatement() method of the Connection interface.Execute the Query: Execute the query using the executeUpdate() method of the ...
Read MoreCan we return Result sets in JDBC?
Yes, just like any other objects in Java we can pass a ResultSet object as a parameter to a method and, return it from a method.Let us create a table with name MyPlayers in MySQL database using CREATE statement as shown below −CREATE TABLE MyPlayers( ID INT, First_Name VARCHAR(255), Last_Name VARCHAR(255), Date_Of_Birth date, Place_Of_Birth VARCHAR(255), Country VARCHAR(255), PRIMARY KEY (ID) );Now, we will insert 7 records in MyPlayers table using INSERT statements −insert into MyPlayers values(1, 'Shikhar', 'Dhawan', DATE('1981-12-05'), 'Delhi', 'India'); insert into MyPlayers values(2, 'Jonathan', 'Trott', DATE('1981-04-22'), 'CapeTown', 'SouthAfrica'); insert into MyPlayers values(3, 'Kumara', 'Sangakkara', ...
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