JDBC-答侃尖才囂鞘斤嵆
JDBC-答侃尖才囂鞘斤嵆
參和頁匯乂斤囂鞘斤嵆聞喘答侃尖議灸侏化帶?
宸倖幣箭旗鷹児噐岻念議桟廠才方象垂譜崔。
鹸崙娚薮參和旗鷹?園咎塰佩泌和?
園咎參貧旗鷹?
輝低塰佩JDBCExample?恢伏泌和補竃?
參和頁匯乂斤囂鞘斤嵆聞喘答侃尖議灸侏化帶?
- 聞喘createStatment圭隈干繍囂鞘斤嵆
- 聞喘setAutoCommit()繍auto-commit譜崔葎false
- 聞喘addBatch()耶紗勝辛嬬謹議SQL囂鞘欺囂鞘斤嵆嶄
- 聞喘executeBatch()圭隈峇佩侭嗤議SQL囂鞘幹秀囂鞘斤嵆
- 恷嶮?聞喘commit()圭隈貧勧侭嗤議俐個
宸倖幣箭旗鷹児噐岻念議桟廠才方象垂譜崔。
鹸崙娚薮參和旗鷹?園咎塰佩泌和?
// Import required packages
import java.sql.*;
public class JDBCExample {
// JDBC driver name and database URL
static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
static final String DB_URL = "jdbc:mysql://localhost/EMP";
// Database credentials
static final String USER = "username";
static final String PASS = "password";
public static void main(String[] args) {
Connection conn = null;
Statement stmt = null;
try{
// Register JDBC driver
Class.forName("com.mysql.jdbc.Driver");
// Open a connection
System.out.println("Connecting to database...");
conn = DriverManager.getConnection(DB_URL,USER,PASS);
// Create statement
System.out.println("Creating statement...");
stmt = conn.createStatement();
// Set auto-commit to false
conn.setAutoCommit(false);
// First, let us select all the records and display them.
printRows( stmt );
// Create SQL statement
String SQL = "INSERT INTO Employees (id, first, last, age) " +
"VALUES(200,'Zia', 'Ali', 30)";
// Add above SQL statement in the batch.
stmt.addBatch(SQL);
// Create one more SQL statement
SQL = "INSERT INTO Employees (id, first, last, age) " +
"VALUES(201,'Raj', 'Kumar', 35)";
// Add above SQL statement in the batch.
stmt.addBatch(SQL);
// Create one more SQL statement
SQL = "UPDATE Employees SET age = 35 " +
"WHERE id = 100";
// Add above SQL statement in the batch.
stmt.addBatch(SQL);
// Create an int[] to hold returned values
int[] count = stmt.executeBatch();
//Explicitly commit statements to apply changes
conn.commit();
// Again, let us select all the records and display them.
printRows( stmt );
// Clean-up environment
stmt.close();
conn.close();
}catch(SQLException se){
//Handle errors for JDBC
se.printStackTrace();
}catch(Exception e){
//Handle errors for Class.forName
e.printStackTrace();
}finally{
//finally block used to close resources
try{
if(stmt!=null)
stmt.close();
}catch(SQLException se2){
}// nothing we can do
try{
if(conn!=null)
conn.close();
}catch(SQLException se){
se.printStackTrace();
}//end finally try
}//end try
System.out.println("Goodbye!");
}//end main
public static void printRows(Statement stmt) throws SQLException{
System.out.println("Displaying available rows...");
// Let us select all the records and display them.
String sql = "SELECT id, first, last, age FROM Employees";
ResultSet rs = stmt.executeQuery(sql);
while(rs.next()){
//Retrieve by column name
int id = rs.getInt("id");
int age = rs.getInt("age");
String first = rs.getString("first");
String last = rs.getString("last");
//Display values
System.out.print("ID: " + id);
System.out.print(", Age: " + age);
System.out.print(", First: " + first);
System.out.println(", Last: " + last);
}
System.out.println();
rs.close();
}//end printRows()
}//end JDBCExample
園咎參貧旗鷹?
C:>javac JDBCExample.java C:>
輝低塰佩JDBCExample?恢伏泌和補竃?
C:>java JDBCExample Connecting to database... Creating statement... Displaying available rows... ID: 95, Age: 20, First: Sima, Last: Chug ID: 100, Age: 18, First: Zara, Last: Ali ID: 101, Age: 25, First: Mahnaz, Last: Fatma ID: 102, Age: 30, First: Zaid, Last: Khan ID: 103, Age: 30, First: Sumit, Last: Mittal ID: 110, Age: 20, First: Sima, Last: Chug Displaying available rows... ID: 95, Age: 20, First: Sima, Last: Chug ID: 100, Age: 35, First: Zara, Last: Ali ID: 101, Age: 25, First: Mahnaz, Last: Fatma ID: 102, Age: 30, First: Zaid, Last: Khan ID: 103, Age: 30, First: Sumit, Last: Mittal ID: 110, Age: 20, First: Sima, Last: Chug ID: 200, Age: 30, First: Zia, Last: Ali ID: 201, Age: 35, First: Raj, Last: Kumar Goodbye! C:>