How do I get columns in ResultSet?
You can get the column count in a table using the getColumnCount() method of the ResultSetMetaData interface. On invoking, this method returns an integer representing the number of columns in the table in the current ResultSet object.
How do I get the ResultSet header?
Java ResultSet – get Column name based on Index ResultSetMetaData metaData = resultSet. getMetaData(); int count = metaData. getColumnCount(); for (int i = 1; i <= count; i++) { if (metaData. getColumnName(i).
How can I fetch the values from database using column name in a JDBC program?
Getting column names of a database table
- Load the JDBC driver, using the forName(String className) API method of the Class.
- Create a Connection to the database.
- Create a Statement, using the createStatement() API method of the Connection.
- Execute the query to the database, using the executeQuery(String sql) API method.
Which method of the ResultSet is used to determine whether a value retrieved is null or not?
wasNull() method
The wasNull() method of the ResultSet interface determines whether the last column read had a Null value.
How do I get a list of column names in ResultSet?
You can get the name of a particular column using the getColumnName() 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 specified column.
How can I determine if the column name exist in the ResultSet?
You can use ResultSetMetaData. getColumnLabel if you are interested in getting the name as defined by the AS clause of your SQL query.
How do you reference a column in Java?
You can refer column with arr[i][j], i denotes row and j denotes column in that row. That’s not a reference to an entire column, it’s a reference to one element. “Rows” are atomic units from an array perspective. “Columns” are pieces of each of those units at the same index.
What is ResultSet method in Java?
A ResultSet is a Java object that contains the results of executing an SQL query. In other words, it contains the rows that satisfy the conditions of the query. The data stored in a ResultSet object is retrieved through a set of get methods that allows access to the various columns of the current row.
Which method is used to retrieve the ResultSet created in Java?
The ResultSet interface declares getter methods (for example, getBoolean and getLong ) for retrieving column values from the current row. You can retrieve values using either the index number of the column or the alias or name of the column.
How does Jdbctemplate get metadata?
List rsmdList = template. query(builder. toString(),new ResultSetExtractor() { @Override public ResultSetMetaData extractData(ResultSet rs) throws SQLException, DataAccessException { ResultSetMetaData rsmd = rs. getMetaData(); return rsmd; } }); ResultSetMetaData rsmd = rsmdList.
How to get the column name of a resultset in SQL?
ResultSet rs = stmt.executeQuery(“SELECT a, b, c FROM TABLE2”); ResultSetMetaData rsmd = rs.getMetaData(); String name = rsmd.getColumnName(1); and you can get the column name from there. If you do select x as y from table
How to get table columns from resultset getmetadata?
We can get table columns from the ResultSet getMetaData () method returns ResultSetMetaData interface object. ResultSetMetaData interface object that can be used to get information about the types and properties of the columns in a ResultSet object.
How to get column names from a database table in Java?
In this example, we will discuss how to get column names from a database table using java.sql.ResultSet. We can get table columns from the ResultSet getMetaData () method returns ResultSetMetaData interface object.
How to get column name from result set in MySQL Java 8?
MySQL MySQLi Database Java 8 To get the column name on the result set, you need to use getMetaData () method. The prototype of getMetadata () is as follows − ResultSetMetaData getMetaData throws SQLException;