java_第一年_JDBC（4）

注：该篇只是为了小白的我熟悉下JDBC的代码，练习篇

在mysql中建test测试库，并创建一张employees表，加入一些数据如下图：

通过JDBC连接对表中数据进行添加：

package lzj_learn;
import java.sql.*;
import java.io.*;
import java.util.*;
public class test2 {
    static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
    static final String DB_URL = "jdbc:mysql://localhost/test";
    static final String USER = "root";
    static final String PASS = "";
    public static void main(String[] args) {
        Connection conn = null;
        PreparedStatement stmt = null;
        try {
            Class.forName("com.mysql.jdbc.Driver");
            conn = DriverManager.getConnection(DB_URL,USER,PASS);
            String SQL = "INSERT INTO employees(id,age,first,last) VALUES(?,?,?,?)";
            stmt = conn.prepareStatement(SQL);
            conn.setAutoCommit(false);
            printRows(stmt);
            stmt.setInt(, );
            stmt.setInt(, );
            stmt.setString(,"xiao");
            stmt.setString(, "zhu");
            stmt.addBatch();
            stmt.setInt(, );
            stmt.setInt(, );
            stmt.setString(,"xiao");
            stmt.setString(, "cao");
            stmt.addBatch();
            int[] count = stmt.executeBatch();
            conn.commit();
            printRows(stmt);
            stmt.close();
            conn.close();
        }catch(SQLException se) {
            se.printStackTrace();
        }catch(Exception e) {
            e.printStackTrace();
        }finally {
            try {
                if (stmt!=null)
                    stmt.close();
            }catch(SQLException se) {
            }
            try {
                if(conn!=null)
                    conn.close();
            }catch(SQLException se) {
                se.printStackTrace();
            }
        }
    }
    public static void printRows(Statement stmt) throws SQLException{
        String sql = "SELECT * FROM employees";
        ResultSet rs = stmt.executeQuery(sql);
        while(rs.next()) {
            int id = rs.getInt("id");
            int age = rs.getInt("age");
            String first = rs.getString("first");
            String last = rs.getString("last");
            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();
    }
}

在import时要记得需导入mysql-connector-java-xxxx-jar包；

运行后结果如下：