jdbcTemplate的CRUD操作总结

在使用Spring框架的系统中，增删改查操作是经常频繁的使用，也就是像我这样的新手经常做的CRUD操作，我经常使用到的是HibernateTemplate和JdbcTemplate来操作。对于Oracle数据库来说，使用HibernateTemplate操作很方便。最近换了SqlServer2008数据库，而且要处理分页。老大说使用jdbc直接操作，哎！有了hibernate，很少使用jdbc都快忘记了...

1.使用jdbcTemplate分页查询，注意sqlServer2008使用的是top分页操作：

Java代码







public List getList(String keywords,String startTime,String endTime,Pagenation pagenation){

String sqlAll="select * from message where 1=1";
String sql="";
String sqlTop="select top "+pagenation.getPageSize()+"* from message where id not in"+

" (select top "+pagenation.getStartRow()+" id from message )";

if(startTime !=null && !"".equals(startTime)){

sql+=" and createtime>='"+startTime+"'";

}
if(endTime !=null && !"".equals(endTime)){

sql+=" and createtime<='"+endTime+"'";

}
if(keywords !=null && !"".equals(keywords.trim())){

sql+=" and keywords like '%"+keywords.trim()+"%'";

}
sql+=" order by createtime desc";
List listCount=this.jdbcTemplate.queryForList(sqlAll+sql);

//获取记录的总数
pagenation.setRowCount(listCount.size());
//RowMapper将从数据库查询出来的结果,并已经封装成message对象，再存入list容器

List list=this.jdbcTemplate.query(sqlTop+sql,
new RowMapper(){
public Object mapRow(ResultSet rs,int rowNum)
throws SQLException{
MessageSqlServer message=new MessageSqlServer();

message.setId(rs.getLong(1));
message.setCreator(rs.getString(2));
message.setTime(rs.getDate(3));
message.setTrsNum(rs.getLong(4));
message.setComNum(rs.getLong(5));
message.setContent(rs.getString(6));
return message;
}
});
return list;
}
}

public List getList(String keywords,String startTime,String endTime,Pagenation pagenation){
String sqlAll="select * from message where 1=1";
String sql="";
String sqlTop="select top "+pagenation.getPageSize()+"* from   message where id not in"+
" (select top "+pagenation.getStartRow()+" id from message )";
if(startTime !=null && !"".equals(startTime)){
sql+=" and createtime>='"+startTime+"'";
}
if(endTime !=null && !"".equals(endTime)){
sql+=" and createtime<='"+endTime+"'";
}
if(keywords !=null && !"".equals(keywords.trim())){
sql+=" and keywords like '%"+keywords.trim()+"%'";
}
sql+=" order by createtime desc";
List listCount=this.jdbcTemplate.queryForList(sqlAll+sql);
//获取记录的总数
pagenation.setRowCount(listCount.size());
//RowMapper将从数据库查询出来的结果,并已经封装成message对象，再存入list容器
List list=this.jdbcTemplate.query(sqlTop+sql, new RowMapper(){
public Object mapRow(ResultSet rs,int rowNum) throws SQLException{
MessageSqlServer message=new MessageSqlServer();
message.setId(rs.getLong(1));
message.setCreator(rs.getString(2));
message.setTime(rs.getDate(3));
message.setTrsNum(rs.getLong(4));
message.setComNum(rs.getLong(5));
message.setContent(rs.getString(6));
return message;
}
});
return list;
}
}

2.jdbcTemplate下的增加（create）操作

Java代码







//不带参数的
jdbcTemplate.update("insert into message values('1, '"你好
"',***)");
//带参数的
jdbcTemplate.update("insert into message values(?,?,***)",

new Object[]{1,"你好"，*** });

//带参数，使用prepareStatement
int id =101;
String keywords="你好";
String ***="***";
jdbcTemplate.update("insert into message value (?, ?, ?, ?)",

new PreparedStatementSetter() {
public void setValues(PreparedStatement ps)
throws SQLException {
ps.setInt(1, id);
ps.setString(2, keywords);
ps.set***(3,***);
}
});

//不带参数的
jdbcTemplate.update("insert into message values('1, '"你好 "',***)");
//带参数的
jdbcTemplate.update("insert into message values(?,?,***)",
new Object[]{1,"你好"，*** });
//带参数，使用prepareStatement
int id =101;
String keywords="你好";
String ***="***";
jdbcTemplate.update("insert into message value (?, ?, ?, ?)",
new PreparedStatementSetter() {
public void setValues(PreparedStatement ps) throws SQLException {
ps.setInt(1, id);
ps.setString(2, keywords);
ps.set***(3,***);
}
});

3.jdbcTemplate下的修改（update）和删除(delete)操作

Java代码







//表里有个字段status，0和1表示;不带参数；
jdbcTemplate.update("update message set status=1 where id="+id+"");

jdbcTemplate.update("delete from message where id="+id+"");

//表里有个字段status，0和1表示;带参数；
jdbcTemplate.update("update message set status=？ where id=？",

new Object[]{1,id });

jdbcTemplate.update("delete from message where id=?",new Object[]{ id });

//若要修改字段的类型，则使用
jdbcTemplate.update(sql, new Object[]{id },
new int[]{Types.VARCHAR,Types.BIGINT })

//表里有个字段status，0和1表示;不带参数；
jdbcTemplate.update("update message set status=1 where id="+id+"");
jdbcTemplate.update("delete from message where id="+id+"");

//表里有个字段status，0和1表示;带参数；
jdbcTemplate.update("update message set status=？ where id=？",
new Object[]{1,id });
jdbcTemplate.update("delete from message where id=?",new Object[]{ id });

//若要修改字段的类型，则使用
jdbcTemplate.update(sql, new Object[]{id }, new int[]{Types.VARCHAR,Types.BIGINT })

4.jdbcTemplate下的查询操作，介绍两种方法(重点)

4.1 使用RowMapper接口直接封装你要的对象为list

Java代码







public List getTaskList(){
String sql="select * from task where status=0 order by id desc";

List list =this.getJdbcTemplate().query(sql,
new RowMapper(){
public Object mapRow(ResultSet rs,
int rowNum) throws SQLException {
Task task=new Task();
task.setId(rs.getLong(1));
task.setCreator(rs.getLong(2));
task.setStatus(rs.getLong(3));
task.setStartTime(rs.getDate(4));
task.setEndTime(rs.getDate(5));
task.setKeyWords(rs.getString(6));
return task;
}

});
return list;
}

public List getTaskList(){
String sql="select * from task where status=0 order by id desc";
List list =this.getJdbcTemplate().query(sql, new RowMapper(){
public Object mapRow(ResultSet rs, int rowNum) throws    SQLException {
Task task=new Task();
task.setId(rs.getLong(1));
task.setCreator(rs.getLong(2));
task.setStatus(rs.getLong(3));
task.setStartTime(rs.getDate(4));
task.setEndTime(rs.getDate(5));
task.setKeyWords(rs.getString(6));
return task;
}

});
return list;
}

4.2使用迭代器模式list.iterator()方法封装对象

Java代码







public List getTaskList(){
String sql="select * from task where status=0 order by id desc";

List taskList=new ArrayList();
List rows=this.getJdbcTemplate().queryForList(sql);

Iterator it=rows.iterator();
while(it.hasNext()){
Map rs=(Map)it.next();
Task task=new Task();
task.setId((Long) rs.get("id"));
task.setCreator((Long) rs.get("creator"));
task.setStatus((Long) rs.get("status"));
task.setStartTime((Date) rs.get("startTime"));
task.setEndTime((Date) rs.get("endTime"));
taskList.add(task);
}
return taskList;
}

public List getTaskList(){
String sql="select * from task where status=0 order by id desc";
List taskList=new ArrayList();
List rows=this.getJdbcTemplate().queryForList(sql);
Iterator it=rows.iterator();
while(it.hasNext()){
Map rs=(Map)it.next();
Task task=new Task();
task.setId((Long) rs.get("id"));
task.setCreator((Long) rs.get("creator"));
task.setStatus((Long) rs.get("status"));
task.setStartTime((Date) rs.get("startTime"));
task.setEndTime((Date) rs.get("endTime"));
taskList.add(task);
}
return taskList;
}

总结：jdbcTemplate方法比较方便的操作数据库的增删改查，以上的信息可能有错误，欢迎大家指出。