MySQL_(Java)使用JDBC向数据库中插入(insert)数据
MySQL_(Java)使用JDBC向数据库发起查询请求 传送门
MySQL_(Java)使用JDBC向数据库中插入(insert)数据 传送门
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MySQL_(Java)使用JDBC向数据库中修改(update)数据 传送门
MySQL数据库中的数据,数据库名garysql,表名garytb
import java.sql.Connection;import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class JDBC01 {
public static void main(String[] args) throws SQLException {
insert("插入Garyy4","123456");
}
public static void selectAll() throws SQLException {
//注册驱动 使用驱动连接数据库
Connection con = null;
Statement stmt = null;
ResultSet rs = null;
try {
//数据库的连接
con = JDBCUtils.getConnection();
//数据库的增删改查
stmt = con.createStatement();
//返回一个结果集
rs =stmt.executeQuery("select * from garytb");
while(rs.next()) {
//System.out.println(rs.getString(1)+","+rs.getString(2)+","+rs.getString(3));
System.out.println(rs.getString("id")+","+rs.getString("username")+","+rs.getString("password"));
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
JDBCUtils.close(rs, stmt, con);
}
}
//校验用户
public static boolean selectByUernamePassword(String username,String password) throws SQLException {
Connection con=null;
Statement stmt = null;
ResultSet rs = null;
try {
Class.forName("com.mysql.jdbc.Driver");
String url ="jdbc:mysql://localhost:3306/garysql?useUnicode=true&characterEncoding=UTF8&useSSL=false";
con = DriverManager.getConnection(url,"root","123456");
stmt =con.createStatement();
String sql = "select * from garytb where username = \'"+username+"\' and password = \'"+password+"\'";
//System.out.println(sql);
rs = stmt.executeQuery(sql);
if(rs.next()) {
return true;
}else {
return false;
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
if(rs!=null)
rs.close();
if(stmt!=null)
stmt.close();
if(con!=null)
con.close();
}
return false;
}
public static boolean selectByUP2(String username,String password) throws SQLException{
Connection con=null;
Statement stmt = null;
ResultSet rs = null;
try {
Class.forName("com.mysql.jdbc.Driver");
String url ="jdbc:mysql://localhost:3306/garysql?useUnicode=true&characterEncoding=UTF8&useSSL=false";
con = DriverManager.getConnection(url,"root","123456");
String sql = "select * from garytb where username = ? and password = ?";
PreparedStatement pstmt = con.prepareStatement(sql);
//添加参数
pstmt.setString(1, username);
pstmt.setString(2, password);
//进行查询
rs = pstmt.executeQuery();
if(rs.next()) {
return true;
}else {
return false;
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
if(rs!=null)
rs.close();
if(stmt!=null)
stmt.close();
if(con!=null)
con.close();
}
return false;
}
//pageNumber是页数,第几页,pageCount是每页显示多少个数据
public static void selectUserByPage(int pageNumber,int pageCount) throws SQLException {
//注册驱动 使用驱动连接数据库
Connection con = null;
PreparedStatement stmt = null;
ResultSet rs = null;
try {
Class.forName("com.mysql.jdbc.Driver");
//String url ="jdbc:mysql://localhost:3306/garysql";
//指定编码查询数据库
String url ="jdbc:mysql://localhost:3306/garysql?useUnicode=true&characterEncoding=UTF8&useSSL=false";
String user = "root";
String password = "123456";
//建立和数据库的连接
con = DriverManager.getConnection(url,user,password);
stmt = con.prepareStatement("select * from garytb limit ?,?");
stmt.setInt(1, (pageNumber-1)*pageCount );
stmt.setInt(2, pageCount);
rs = stmt.executeQuery();
while(rs.next()) {
//System.out.println(rs.getString(1)+","+rs.getString(2)+","+rs.getString(3));
System.out.println(rs.getString("id")+","+rs.getString("username")+","+rs.getString("password"));
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
if(rs!=null)
rs.close();
if(stmt!=null)
stmt.close();
if(con!=null)
con.close();
}
}
//crud: create read updata delete
//插入语句
public static void insert(String username,String password) throws SQLException {
//注册驱动 使用驱动连接数据库
Connection con = null;
PreparedStatement stmt = null;
ResultSet rs = null;
try {
con = JDBCUtils.getConnection();
String sql = "insert into garytb(username,password) values(?,?)";
stmt = con.prepareStatement(sql);
stmt.setString(1, username);
stmt.setString(2, password);
int result =stmt.executeUpdate();// 返回值代表收到影响的行数
System.out.println("插入成功"+username);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
JDBCUtils.close(rs, stmt, con);
}
}
}
JDBC01.java
import java.sql.Connection;import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class JDBCUtils {
private static final String connectionURL = "jdbc:mysql://localhost:3306/garysql?useUnicode=true&characterEncoding=UTF8&useSSL=false";
private static final String username = "root";
private static final String password = "123456";
//创建数据库的连接
public static Connection getConnection() {
try {
Class.forName("com.mysql.jdbc.Driver");
return DriverManager.getConnection(connectionURL,username,password);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
//关闭数据库的连接
public static void close(ResultSet rs,Statement stmt,Connection con) throws SQLException {
if(rs!=null)
rs.close();
if(stmt!=null)
stmt.close();
if(con!=null)
con.close();
}
}
JDBCUtils.java
向数据库中添加用户名和密码
public static void insert(String username,String password) throws SQLException {//注册驱动 使用驱动连接数据库
Connection con = null;
PreparedStatement stmt = null;
ResultSet rs = null;
try {
con = JDBCUtils.getConnection();
String sql = "insert into garytb(username,password) values(?,?)";
stmt = con.prepareStatement(sql);
stmt.setString(1, username);
stmt.setString(2, password);
int result =stmt.executeUpdate();// 返回值代表收到影响的行数
System.out.println("插入成功"+username);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
JDBCUtils.close(rs, stmt, con);
}
}
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