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Count the number of columns in a MySQL table with Java
For this, use ResultSetMetaData. Let us first create a table −
mysql> create table DemoTable -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentFirstName varchar(20), -> StudentLastName varchar(20) -> ); Query OK, 0 rows affected (0.58 sec)
The Java code is as follows −
Example
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import com.mysql.jdbc.ResultSetMetaData;
public class ResultSetDemo {
public static void main(String[] args) {
Connection con = null;
PreparedStatement ps = null;
Statement st = null;
ResultSet rs = null;
try {
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/web?useSSL=false", "root", "123456");
String query = "select StudentId,StudentFirstName,StudentLastName from DemoTable";
st = con.createStatement();
rs = st.executeQuery(query);
ResultSetMetaData rsmd = (ResultSetMetaData) rs.getMetaData();
int numberOfColumn = rsmd.getColumnCount();
System.out.println(" Number Of Columns: " + numberOfColumn);
System.out.println("All Details Of Columns:");
for (int i = 1; i <= numberOfColumn; i++) {
String columnName = rsmd.getColumnName(i);
String dataTypeOfColumn = rsmd.getColumnTypeName(i);
System.out.println(columnName + " has data type " + dataTypeOfColumn);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}output
Number Of Columns: 3 All Details Of Columns: StudentId has data type INT StudentFirstName has data type VARCHAR StudentLastName has data type VARCHAR
The snapshot of the output is as follows −
Updated on: 11-Dec-2019
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