JDBC操作数据库的几种方式。

1最基本的操作读取

import java.sql.*;public class TestJDBC {public static void main(String[] args) throws Exception{ResultSet rs = null;Statement stmt = null;Connection conn = null;Class.forName("oracle.jdbc.driver.OracleDriver");conn = DriverManager.getConnection("jdbc:oracle:thin:@192.168.0.1:1521:SXT", "scott", "tiger");stmt = conn.createStatement();rs = stmt.executeQuery("select * from dept");while(rs.next()) {System.out.println(rs.getString("deptno"));System.out.println(rs.getInt("deptno"));}rs.close();stmt.close();conn.close();

          }}

2PreparedStatement读取

import java.sql.*;public class TestPrepStmt {public static void main(String[] args) throws Exception{PreparedStatement pstmt = null;Connection conn = null;Class.forName("oracle.jdbc.driver.OracleDriver");conn = DriverManager.getConnection("jdbc:oracle:thin:@192.168.0.1:1521:SXT", "scott", "tiger");pstmt = conn.prepareStatement("insert into dept2 values (?, ?, ?)");pstmt.setInt(1, 33);pstmt.setString(2, "name");pstmt.setString(3, "loc");pstmt.executeUpdate();pstmt.close();conn.close();         }

}

3调用存储过程

import java.sql.*;public class TestProc {public static void main(String[] args) throws Exception {Class.forName("oracle.jdbc.driver.OracleDriver");Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@192.168.0.1:1521:SXT", "scott", "tiger");CallableStatement cstmt = conn.prepareCall("{call p(?, ?, ?, ?)}");cstmt.registerOutParameter(3, Types.INTEGER);cstmt.registerOutParameter(4, Types.INTEGER);cstmt.setInt(1, 3);cstmt.setInt(2, 4);cstmt.setInt(4, 5);cstmt.execute();System.out.println(cstmt.getInt(3));System.out.println(cstmt.getInt(4));cstmt.close();conn.close();}}

4执行批处理

import java.sql.*;public class TestBatch {public static void main(String[] args) throws Exception {Class.forName("oracle.jdbc.driver.OracleDriver");Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@192.168.0.1:1521:SXT", "scott", "tiger");/*Statement stmt = conn.createStatement();stmt.addBatch("insert into dept2 values (51, '500', 'haha')");stmt.addBatch("insert into dept2 values (52, '500', 'haha')");stmt.addBatch("insert into dept2 values (53, '500', 'haha')");stmt.executeBatch();stmt.close();*/PreparedStatement ps = conn.prepareStatement("insert into dept2 values (?, ?, ?)");ps.setInt(1, 61);ps.setString(2, "haha");ps.setString(3, "bj");ps.addBatch();ps.setInt(1, 62);ps.setString(2, "haha");ps.setString(3, "bj");ps.addBatch();ps.setInt(1, 63);ps.setString(2, "haha");ps.setString(3, "bj");ps.addBatch();ps.executeBatch();ps.close();conn.close();}}

5 执行事务：

import java.sql.*;public class TestTransaction {public static void main(String[] args) {Connection conn = null;Statement stmt = null;try {Class.forName("oracle.jdbc.driver.OracleDriver");conn = DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:SXT", "scott", "tiger");conn.setAutoCommit(false);stmt = conn.createStatement();stmt.addBatch("insert into dept2 values (51, '500', 'haha')");stmt.addBatch("insert into dept2 values (52, '500', 'haha')");stmt.addBatch("insert into dept2 values (53, '500', 'haha')");stmt.executeBatch();conn.commit();conn.setAutoCommit(true);} catch (ClassNotFoundException e) {e.printStackTrace();} catch(SQLException e) {e.printStackTrace();try {if(conn != null){conn.rollback();conn.setAutoCommit(true);}} catch (SQLException e1) {e1.printStackTrace();}}finally {try {if(stmt != null)stmt.close();if(conn != null)conn.close();} catch (SQLException e) {e.printStackTrace();}}}}

6可以滚动的结果集：

import java.sql.*;public class TestScroll {public static void main(String args[]) {try {new oracle.jdbc.driver.OracleDriver();String url = "jdbc:oracle:thin:@192.168.0.1:1521:SXT";Connection conn = DriverManager.getConnection(url, "scott", "tiger");Statement stmt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);ResultSet rs = stmt.executeQuery("select * from emp order by sal");rs.next();System.out.println(rs.getInt(1));rs.last();System.out.println(rs.getString(1));System.out.println(rs.isLast());System.out.println(rs.isAfterLast());System.out.println(rs.getRow());rs.previous();System.out.println(rs.getString(1));rs.absolute(6);System.out.println(rs.getString(1));rs.close();stmt.close();conn.close();} catch (SQLException e) {e.printStackTrace();}}}

7可以更新的结果集：

import java.sql.*;public class TestUpdataRs {    public static void main(String args[]){try{    new oracle.jdbc.driver.OracleDriver();    String url="jdbc:oracle:thin:@192.168.0.1:1521:SXT";    Connection conn=DriverManager.getConnection(url,"scott","tiger");    Statement stmt=conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE);        ResultSet rs=stmt.executeQuery("select * from emp2");        rs.next();    //更新一行数据    rs.updateString("ename","AAAA");    rs.updateRow();    //插入新行    rs.moveToInsertRow();    rs.updateInt(1, 9999);    rs.updateString("ename","AAAA");    rs.updateInt("mgr", 7839);    rs.updateDouble("sal", 99.99);    rs.insertRow();    //将光标移动到新建的行    rs.moveToCurrentRow();    //删除行    rs.absolute(5);    rs.deleteRow();    //取消更新    //rs.cancelRowUpdates();  }catch(SQLException e){    e.printStackTrace();  }    }}