1、增加 executeUpdate
package lesson02;
import lesson02.utils.JdbcUtils;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class TestInsert {
public static void main(String[] args) {
Connection conn = null;
Statement st = null;
ResultSet rs = null;
try {
conn = JdbcUtils.getConnection();//获取数据库连接
st = conn.createStatement();//获取SQL执行对象
String sql = "INSERT INTO user(id,`NAME`,`PASSWORD`,`email`,`birthday`)" +
"VALUES(4,'kuangshen','123456','1212121@qq.com','2024-07-21')";
int i = st.executeUpdate(sql);
if(i>0){
System.out.println("插入成功");
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
JdbcUtils.release(conn,st,rs);
}
}
}
2、删除 executeUpdate
package lesson02;
import lesson02.utils.JdbcUtils;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class TestDelete {
public static void main(String[] args) {
Connection conn = null;
Statement st = null;
ResultSet rs = null;
try {
conn = JdbcUtils.getConnection();//获取数据库连接
st = conn.createStatement();//获取SQL执行对象
String sql = "DELETE FROM `user` WHERE id=4";
int i = st.executeUpdate(sql);
if(i>0){
System.out.println("删除成功");
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
JdbcUtils.release(conn,st,rs);
}
}
}
3、更新 executeUpdate
package lesson02;
import lesson02.utils.JdbcUtils;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class TestUpdate {
public static void main(String[] args) {
Connection conn = null;
Statement st = null;
ResultSet rs = null;
try {
conn = JdbcUtils.getConnection();//获取数据库连接
st = conn.createStatement();//获取SQL执行对象
String sql = "UPDATE `user` SET `NAME`='lixinyu',email = '1234565@qq.com' WHERE id =1";
int i = st.executeUpdate(sql);
if(i>0){
System.out.println("更新成功");
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
JdbcUtils.release(conn,st,rs);
}
}
}
4、查询 executeQuery
package lesson02;
import lesson02.utils.JdbcUtils;
import java.sql.Connection;
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 st = null;
ResultSet rs = null;
try {
conn = JdbcUtils.getConnection();//获取数据库连接
st = conn.createStatement();//获取SQL执行对象
String sql = "SELECT * FROM `user` where id =1";
rs = st.executeQuery(sql);
while (rs.next()){
System.out.println(rs.getString("Name"));
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
JdbcUtils.release(conn,st,rs);
}
}
}
