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();
	  }
    }
}