Concept explainers
a.
Explanation of Solution
To print the result as a tabular format:
- Given that the method “static void printTable(String r)” is contained in a class “MetaDisplay”.
- A relation name “r” is considered as the input to this method...
b.
Explanation of Solution
Open
- Given that the method “static void printTable(String r)” is contained in a class “MetaDisplay”.
- A relation name “r” is considered as the input to this method.
- To print the result in a tabular format with the attribute names as table header, this method executes a query “select * from r”...
c.
Explanation of Solution
“static void printTable(String r)” method:
The Java method “printTable(String r)” using JDBC Application
//Define a method
static void printTable(String r)
{
//Execute "try" block
try
{
/*Call the method to return the objects of the class with the given string name*/
Class.forName("oraclejdbc.driver.OracleDriver");
//Connect the database
Connection con=DriverManager.getConnecction("Jdbc:oracle:thin:@db.bnd:2001:bnddb",user,password);
/*Create Statement object to send SQL statements to the database*/
Statement st=con.createStatement();
//Execute select query
ResultSet rst=st.executeQuery(r);
//Get the metadata
ResultSetMetaData meta_data=rst.getMetaData();
//Get the column count from the database
int cnt=meta_data.getColumnCount();
//Print new line
System.out.println("");
//Create “for” loop
for(int i; i<cnt; i++)
//Print column header
System.out.println(""+meta_data.getColumnName(i)+"");
//Print new line
System.out.println("");
//Execute "while" loop for current record
while(rst.next())
{
//Print new line
System.out.println("");
//create "for" loop
for(int i=1; i<=cnt; i++)
//Print the column header
System.out.println(""+meta_data.getColumnName(i)+"");
//Print new line
System.out.println("");
}
//Close the statement
st.close();
//close the connection
con.close();
}
//Catch the exception if found
catch(SQLException e)
{
//Handle the exception
System...

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Chapter 5 Solutions
Database System Concepts
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