//-----------------------------------select----------------------------------
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class TestSelect{
public static void main(String[] args) {
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager
.getConnection("jdbc:mySql://localhost/mydata?user=root&password=root");
stmt = conn.createStatement();
String sql = "select * from article";
rs = stmt.executeQuery(sql);
while (rs.next()) {
System.out.println(rs.getInt("id"));
System.out.println(rs.getString("title"));
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (rs != null) {
rs.close();
rs = null;
}
if (stmt != null) {
stmt.close();
stmt = null;
}
if (conn != null) {
conn.close();
conn = null;
}
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
//-------------------------insert--------------------------
import java.sql.*;
public class TestInsert {
public static void main(String[] args) {
Connection conn = null;
Statement stmt = null;
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager
.getConnection("jdbc:mysql://localhost/mydata?user=root&password=root");
stmt = conn.createStatement();
String sql = "insert into article(title) values('fff')";
stmt.executeUpdate(sql);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
stmt.close();
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
//-----------------------------update----------------------------
import java.sql.*;
public class TestUpdate {
public static void main(String[]args){
Connection conn = null;
Statement stmt = null;
try{
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection("jdbc:mysql://localhost/mydata?user=root&password=root");
stmt = conn.createStatement();
String sql = "update article set title ='ggg' where id=5";
stmt.executeUpdate(sql);
}catch(Exception e){
e.printStackTrace();
}finally{
try {
stmt.close();
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
//---------------------------delete-------------------------
import java.sql.*;
public class TestDelete {
public static void main(String[]args){
Connection conn = null;
Statement stmt = null;
try{
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection("jdbc:mysql://localhost/mydata?user=root&password=root");
stmt = conn.createStatement();
stmt.execute("delete from article where title='fff'");
}catch(Exception e){
e.printStackTrace();
}finally{
try {
conn.close();
stmt.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}