ResultSet: setFetchSize(int rows)
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLWarning;
import java.sql.Statement;
public class Main {
public static void main(String[] args) throws Exception {
Connection conn = getConnection();
conn.setAutoCommit(false);
Statement st = conn.createStatement();
st.setFetchSize(1);
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,'nameValue')");
st = conn.createStatement();
ResultSet rs = st.executeQuery("SELECT * FROM survey");
rs.setFetchSize(1);
outputResultSet(rs);
checkForWarning(rs.getWarnings());
rs.close();
st.close();
conn.close();
}
static boolean checkForWarning(SQLWarning w) {
if (w == null) {
return false;
}
do {
System.err.println("Warning:\nMessage: " + w.getMessage());
System.err.println("SQL state: " + w.getSQLState());
System.err.println("Vendor code: " + w.getErrorCode() + "\n----------------");
} while ((w = w.getNextWarning()) != null);
return true;
}
private static void outputResultSet(ResultSet rs) throws Exception {
ResultSetMetaData rsMetaData = rs.getMetaData();
int numberOfColumns = rsMetaData.getColumnCount();
for (int i = 1; i < numberOfColumns + 1; i++) {
String columnName = rsMetaData.getColumnName(i);
System.out.print(columnName + " ");
}
System.out.println();
System.out.println("----------------------");
while (rs.next()) {
for (int i = 1; i < numberOfColumns + 1; i++) {
System.out.print(rs.getString(i) + " ");
}
System.out.println();
}
}
private static Connection getConnection() throws Exception {
Class.forName("org.hsqldb.jdbcDriver");
String url = "jdbc:hsqldb:mem:data/tutorial";
return DriverManager.getConnection(url, "sa", "");
}
}
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