ResultSet table row count
In this chapter you will learn:
Count row in for a table
To get the Number of Rows in a Database Table we use the following SQL command.
select count(*) form <table-name>
The following code uses the SQL command above and returns the row count for a table.
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
/*from java2 s. c o m*/
public class Main {
public static void main(String[] args) throws Exception {
Connection conn = getConnection();
Statement st = conn.createStatement();
st.executeUpdate("create table survey (id int,name varchar(30));");
st.executeUpdate("insert into survey (id,name ) values (1,'nameValue')");
st.executeUpdate("insert into survey (id,name ) values (2,null)");
st.executeUpdate("insert into survey (id,name ) values (3,'Tom')");
st = conn.createStatement();
ResultSet rs = st.executeQuery("SELECT * FROM survey");
rs = st.executeQuery("SELECT COUNT(*) FROM survey");
// get the number of rows from the result set
rs.next();
int rowCount = rs.getInt(1);
System.out.println(rowCount);
rs.close();
st.close();
conn.close();
}
private static Connection getConnection() throws Exception {
Class.forName("org.hsqldb.jdbcDriver");
String url = "jdbc:hsqldb:mem:data/tutorial";
return DriverManager.getConnection(url, "sa", "");
}
}
The code above generates the following result.
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What you will learn in the next chapter:
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