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JDBC连接MysqL数据库:
写入一条数据
import java.sql.Connection; import java.sql.DriverManager; public class MysqL { public static void main(String arg[]) { try { Connection con = null; //定义一个MysqL链接对象 Class.forName("com.MysqL.jdbc.Driver").newInstance(); //MysqL驱动 con = DriverManager.getConnection("jdbc:MysqL://127.0.0.1:3306/test","root","root"); //链接本地MysqL System.out.print("yes"); } catch (Exception e) { System.out.print("MysqL ERROR:" + e.getMessage()); } } }
写入一条数据
import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.Statement; public class MysqL { /** * 入口函数 * @param arg */ public static void main(String arg[]) { try { Connection con = null; //定义一个MysqL链接对象 Class.forName("com.MysqL.jdbc.Driver").newInstance(); //MysqL驱动 con = DriverManager.getConnection("jdbc:MysqL://127.0.0.1:3306/test","root"); //链接本地MysqL Statement stmt; //创建声明 stmt = con.createStatement(); //新增一条数据 stmt.executeUpdate("INSERT INTO user (username,password) VALUES ('init','123456')"); ResultSet res = stmt.executeQuery("select LAST_INSERT_ID()"); int ret_id; if (res.next()) { ret_id = res.getInt(1); System.out.print(ret_id); } } catch (Exception e) { System.out.print("MysqL ERROR:" + e.getMessage()); } } }
import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.Statement; public class MysqL { /** * 入口函数 * @param arg */ public static void main(String arg[]) { try { Connection con = null; //定义一个MysqL链接对象 Class.forName("com.MysqL.jdbc.Driver").newInstance(); //MysqL驱动 con = DriverManager.getConnection("jdbc:MysqL://127.0.0.1:3306/test",'123456')"); ResultSet res = stmt.executeQuery("select LAST_INSERT_ID()"); int ret_id; if (res.next()) { ret_id = res.getInt(1); System.out.print(ret_id); } //删除一条数据 String sql = "DELETE FROM user WHERE id = 1"; long deleteRes = stmt.executeUpdate(sql); //如果为0则没有进行删除操作,如果大于0,则记录删除的条数 System.out.print("DELETE:" + deleteRes); //更新一条数据 String updatesql = "UPDATE user SET username = 'xxxx' WHERE id = 2"; long updateRes = stmt.executeUpdate(updatesql); System.out.print("UPDATE:" + updateRes); } catch (Exception e) { System.out.print("MysqL ERROR:" + e.getMessage()); } } }
import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.ResultSetMetaData; import java.sql.Statement; public class MysqL { /** * 入口函数 * @param arg */ public static void main(String arg[]) { try { Connection con = null; //定义一个MysqL链接对象 Class.forName("com.MysqL.jdbc.Driver").newInstance(); //MysqL驱动 con = DriverManager.getConnection("jdbc:MysqL://127.0.0.1:3306/test",'123456')"); ResultSet res = stmt.executeQuery("select LAST_INSERT_ID()"); int ret_id; if (res.next()) { ret_id = res.getInt(1); System.out.print(ret_id); } //删除一条数据 String sql = "DELETE FROM user WHERE id = 1"; long deleteRes = stmt.executeUpdate(sql); //如果为0则没有进行删除操作,如果大于0,则记录删除的条数 System.out.print("DELETE:" + deleteRes); //更新一条数据 String updatesql = "UPDATE user SET username = 'xxxx' WHERE id = 2"; long updateRes = stmt.executeUpdate(updatesql); System.out.print("UPDATE:" + updateRes); //查询数据并输出 String selectsql = "SELECT * FROM user"; ResultSet selectRes = stmt.executeQuery(selectsql); while (selectRes.next()) { //循环输出结果集 String username = selectRes.getString("username"); String password = selectRes.getString("password"); System.out.print("\r\n\r\n"); System.out.print("username:" + username + "password:" + password); } } catch (Exception e) { System.out.print("MysqL ERROR:" + e.getMessage()); } } }
- rs.absolute() //绝对位置,负数表示从后面数
- rs.first()第一条
- rs.last()最后一条
- rs.prevIoUst()前一条
- rs.next()后一条
- rs.beforeFirst()第一条之前
- rs.afterLast()最后之后
- rs.isFirst(),rs.isLast(),rs.isBeforeFirst(),rs.isAfterLast
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