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import java.math.BigDecimal;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
public class Main {
public static void main(String[] args) throws Exception {
String driver = "oracle.jdbc.driver.OracleDriver";
Class.forName(driver).newInstance();
String jdbcUrl = "jdbc:oracle:thin:@localhost:1521:ORCL";
Connection conn = DriverManager.getConnection(jdbcUrl, "yourName", "mypwd");
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM Employees");
printColumnInfo(rs);
printColumnNames(rs);
processRs(rs);
rs = stmt.executeQuery("SELECT * FROM Location");
printColumnInfo(rs);
printColumnNames(rs);
processRs(rs);
conn.close();
}
public static void processRs(ResultSet rs) throws SQLException {
ResultSetMetaData rmd = rs.getMetaData();
while (rs.next()) {
for (int col = 1; col <= rmd.getColumnCount(); col++)
getData(rs, rmd.getColumnType(col), col);
}
}
public static void printColumnNames(ResultSet rs) throws SQLException {
ResultSetMetaData rmd = rs.getMetaData();
for (int col = 1; col <= rmd.getColumnCount(); col++)
System.out.println(rmd.getColumnName(col) + " ");
}
public static void getData(ResultSet rs, int type, int colIdx) throws SQLException {
switch (type) {
case java.sql.Types.CHAR:
case java.sql.Types.VARCHAR:
System.out.println(rs.getString(colIdx));
break;
case java.sql.Types.INTEGER:
int i = rs.getInt(colIdx);
System.out.println(i);
break;
case java.sql.Types.NUMERIC:
BigDecimal bd = rs.getBigDecimal(colIdx);
System.out.println(bd.toString());
break;
case java.sql.Types.TIMESTAMP:
case java.sql.Types.DATE:
java.sql.Date d = rs.getDate(colIdx);
System.out.println(d.toString());
break;
}
}
public static void printColumnInfo(ResultSet rs) throws SQLException {
ResultSetMetaData rsmd = rs.getMetaData();
int cols = rsmd.getColumnCount();
for (int colIdx = 1; colIdx <= cols; colIdx++) {
String name = rsmd.getColumnName(colIdx);
int type = rsmd.getColumnType(colIdx);
String typeName = rsmd.getColumnTypeName(colIdx);
System.out.println(name + ", " + type + ", " + typeName);
}
}
}
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