使用Spring Jdbc (2)
1：需要配置数据源
2：需要配置dbcTemplate
3：需要集成JdbcDaoSupport
批量更新
public void addBatch(final List<Form> forms){
final String sql = "insert into tb_user(userName) values(?)";
getJdbcTemplate().batchUpdate(sql, new BatchPreparedStatementSetter(){
@Override
public int getBatchSize() {
return forms.size();
}
@Override
public void setValues(PreparedStatement ps, int index)
throws SQLException {
Form form = forms.get(index);
ps.setString(1, form.getUserName());
}
});
}
查询单个：
public Form testSelectOneByRowCallbackHandler(final int formId){
final String sql = "select * from tb_user where userId=?";
Object[] params = new Object[] { formId};
final Form form = new Form();
getJdbcTemplate().query(sql,params,new RowCallbackHandler(){
@Override
public void processRow(ResultSet rs) throws SQLException {
form.setUserId(rs.getInt(1));
form.setUserName(rs.getString(2));
}
});
return form;
}
查询多个
[1] public List testSelectSomeByRowCallbackHandler(final int formId){
final String sql = "select * from tb_user where userId=?";
Object[] params = new Object[] { formId};
final List<Form> forms = new ArrayList<Form>();
getJdbcTemplate().query(sql,params,new RowCallbackHandler(){
@Override
public void processRow(ResultSet rs) throws SQLException {
Form form = new Form();
form.setUserId(rs.getInt(1));
form.setUserName(rs.getString(2));
forms.add(form);
}
});
return forms;
}
利用RowMapper处理结果集
public List testSelectSomeByRowMapper(final int formId){
final String sql = "select * from tb_user where userId=?";
Object[] params = new Object[] { formId};
final List<Form> forms = new ArrayList<Form>();
return getJdbcTemplate().query(sql,params,new RowMapper(){
@Override
public Object mapRow(ResultSet rs, int rowNum) throws SQLException {
Form form = new Form();
form.setUserId(rs.getInt(1));
form.setUserName(rs.getString(2));
return form;
}
});
}
RowCallbackHandler是有状态的，所以不能在多个地方进行复用
RowMapper是无状态的，能在多个地方进行复用
查询单个值
getJdbcTemplate().queryForInt(sql);
……