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摘要: jdbc编程中的一些常用的技巧[总结]
String className,url,uid,pwd;
className = "oracle.jdbc.driver.OracleDriver";
url = "jdbc:oracle:thin:@127.0.0.1:1521:orasvr;
uid = "system";
pwd = "manager";
Class.forName(className);
Connection cn = DriverManager.getConnection(url,uid,pwd);
String jndi = "jdbc/db";
Context ctx = (Context) new InitialContext().lookup ("java:comp/env");
DataSource ds = (DataSource) ctx.lookup(jndi);
Connection cn = ds.getConnection();
String sql;
Statement sm = cn.createStatement();
sm.executeQuery(sql); // 执行数据查询语句(select)
sm.executeUpdate(sql); // 执行数据更新语句(delete、update、insert、drop等)statement.close();
String sql;
sql = "insert into user (id,name) values (?,?)";
PreparedStatement ps = cn.prepareStatement(sql);
ps.setInt(1,xxx);
ps.setString(2,xxx);
...
ResultSet rs = ps.executeQuery(); // 查询
int c = ps.executeUpdate(); // 更新
Statement sm = cn.createStatement(ResultSet.TYPE_SCROLL_ENSITIVE,ResultSet.CONCUR_READ_ONLY);
PreparedStatemet ps = cn.prepareStatement(sql,ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
ResultSet.absolute(9000);
Statement sm = cn.createStatement();
sm.addBatch(sql1);
sm.addBatch(sql2);
...
sm.executeBatch()
PreparedStatement ps = cn.preparedStatement(sql);
{
ps.setXXX(1,xxx);
...
ps.addBatch();
}
ps.executeBatch();
Statement sm ;
sm = cn.createStatement(insert into user...);
sm.executeUpdate();
sm.close();
sm = cn.createStatement("insert into corp...);
sm.executeUpdate();
sm.close();