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1、PreparedStatement接口引入
PreparedStatement是Statement的子接口，属于预处理操作，与直接使用Statement不同的是，PreparedStatement在操作时，
是先在数据表中准备好了一条SQL语句，但是此SQL语句的具体内容暂时不设置，而是之后再进行设置。
（以后开发一般使用PreparedStatement，不用Statement）
2、使用PreparedStatement接口实现添加数据操作
public class JDBCDemo5 { private static MysqlUtil dbUtil = new MysqlUtil(); /** * 添加emp * @param emp * @return * @throws Exception */ private static int addEmp(Emp emp) throws Exception{ Connection conn = dbUtil.getConnection(); String sql = "insert into emp2 values(null,?,?,?)"; PreparedStatement pstmt = conn.prepareStatement(sql); pstmt.setString(1, emp.getName()); pstmt.setDouble(2, emp.getSalary()); pstmt.setInt(3, emp.getAge()); int result = pstmt.executeUpdate(); dbUtil.close(pstmt, conn); return result; } public static void main(String[] args) throws Exception { Emp emp = new Emp("pengpeng",13000,27); int result = addEmp(emp); if(result==1){ System.out.println("添加成功"); }else{ System.out.println("添加失败"); } } }
3、使用PreparedStatement接口实现更新数据操作
public class JDBCDemo6 { private static MysqlUtil dbUtil = new MysqlUtil(); private static int updateEmp(Emp emp) throws Exception{ Connection conn = dbUtil.getConnection(); String sql = "update emp2 set name=?,salary=?,age=? where id=?"; PreparedStatement pstmt = conn.prepareStatement(sql); pstmt.setString(1, emp.getName()); pstmt.setDouble(2, emp.getSalary()); pstmt.setInt(3, emp.getAge()); pstmt.setInt(4, emp.getId()); int result = pstmt.executeUpdate(); dbUtil.close(pstmt, conn); return result; } public static void main(String[] args) throws Exception { Emp emp = new Emp(4,"pengpeng",13000,27); int result = updateEmp(emp); if(result==1){ System.out.println("update成功"); }else{ System.out.println("update失败"); } } }
4、使用PreparedStatement接口实现删除数据操作
public class JDBCDemo7 { private static MysqlUtil dbUtil = new MysqlUtil(); private static int deleteEmp(int id) throws Exception{ Connection conn = dbUtil.getConnection(); String sql = "delete from emp2 where id=?"; PreparedStatement pstmt = conn.prepareStatement(sql); pstmt.setInt(1, id); int result = pstmt.executeUpdate(); dbUtil.close(pstmt, conn); return result; } public static void main(String[] args) throws Exception{ Emp emp = new Emp(4,"pengpeng",13000,27); int result = deleteEmp(4); if(result==1){ System.out.println("delete成功"); }else{ System.out.println("delete失败"); } } }
JDBC（3）-使用PreparedStatement接口实现增、删、改操作
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原文地址：http://www.cnblogs.com/sylovezp/p/4203677.html
