JFinal对oracle数据库的操作配置

JFinal框架操作oracle数据库,需要在configPlugin()方法中配置链接oracle数据库的相关配置

配置JFinal数据库操作插件,configPlugin方法

这里我加载jdbc.properties配置文件实在configConstant加载的

@Override
  public void configConstant(Constants me) {
    loadPropertyFile("jdbc.properties");//加载配置文件
    me.setDevMode(getPropertyToBoolean("config.devModel", false));
    me.setViewType(ViewType.JSP);
    me.setEncoding("UTF-8");
  }

jdbc.properites配置文件

oracle.driver=oracle.jdbc.driver.OracleDriver
oracle.url=jdbc:oracle:thin:@127.0.0.1:1521:orcl
oracle.username=scott
oracle.password=xiaohu

config.devModel=true
@Override
  public void configPlugin(Plugins me) {
    ActiveRecordPlugin arp=null;
    String driver=getProperty("oracle.driver");
    String url=getProperty("oracle.url");
    String username=getProperty("oracle.username");
    String password=getProperty("oracle.password");
    DruidPlugin dp=new DruidPlugin(url, username, password, driver);
    me.add(dp);
    arp=new ActiveRecordPlugin(dp);//设置数据库方言
    arp.setDialect(new OracleDialect());
    arp.setContainerFactory(new CaseInsensitiveContainerFactory());//忽略大小写
    me.add(new EhCachePlugin());
    arp.addMapping("users", "id",Users.class);
    me.add(arp);
  }

需要注意一点的是,由于oracle数据库中在创建表时,会自动的将所有的字段自动转为大写,因此在避免后面操作的时候出现大小写错误的相关异常,这里需要配置忽略大小写的功能

arp.setContainerFactory(new CaseInsensitiveContainerFactory());//忽略大小写

如果不需要对数据库进行增加操作,则必须配置忽略大小写,如果不配置忽略大小写,在保存源代码的该段代码中会出现属性id找不到的异常

/**
  * Save model.
  */
  public boolean save() {
    Config config = getConfig();
    Table table = getTable();
    
    StringBuilder sql = new StringBuilder();
    List<Object> paras = new ArrayList<Object>();
    config.dialect.forModelSave(table, attrs, sql, paras);
    // if (paras.size() == 0)	return false;	// The sql "insert into tableName() values()" works fine, so delete this line
    
    // --------
    Connection conn = null;
    PreparedStatement pst = null;
    int result = 0;
    try {
      conn = config.getConnection();
      if (config.dialect.isOracle())
        pst = conn.prepareStatement(sql.toString(), new String[]{table.getPrimaryKey()});
      else
        pst = conn.prepareStatement(sql.toString(), Statement.RETURN_GENERATED_KEYS);
      
      config.dialect.fillStatement(pst, paras);
      result = pst.executeUpdate();
      getGeneratedKey(pst, table);//如果不配置忽略大小写,执行到这里会出现异常,虽然可以添加到数据库,但是这里报错,界面还是会显示500错误
getModifyFlag().clear();
      return result >= 1;
    } catch (Exception e) {
      throw new ActiveRecordException(e);
    } finally {
      config.close(pst, conn);
    }
  }
getGeneratedKey()源代码部分
/**
  * Get id after save method.
  */
  private void getGeneratedKey(PreparedStatement pst, Table table) throws SQLException {
    String pKey = table.getPrimaryKey();
    if (get(pKey) == null || getConfig().dialect.isOracle()) {
      ResultSet rs = pst.getGeneratedKeys();
      if (rs.next()) {
        Class colType = table.getColumnType(pKey);
        if (colType == Integer.class || colType == int.class)
     set(pKey, rs.getInt(1));
    else if (colType == Long.class || colType == long.class)
     set(pKey, rs.getLong(1));
    else
     set(pKey, rs.getObject(1));		// It returns Long object for int colType
    rs.close();
   }
  }
 }

set()源代码部分

/**
  * Set attribute to model.
  * @param attr the attribute name of the model
  * @param value the value of the attribute
  * @return this model
  * @throws ActiveRecordException if the attribute is not exists of the model
  */
  public M set(String attr, Object value) {
    if (getTable().hasColumnLabel(attr)) {//执行到这里返回false
      attrs.put(attr, value);
      getModifyFlag().add(attr);	// Add modify flag, update() need this flag.
      return (M)this;
    }
    throw new ActiveRecordException("The attribute name is not exists: " + attr);//抛出该异常
  }

现在来说说如果不配置,为什么会出现 The attribute name is not exists:这个异常,这是因为oracle中的字段是大写的,而set方法中传入的attr属性的值是小写,而getTable()中的属性对应的就是oracle字段,这些属性则是大写,因此这里使用getTable().hasColumnLabel(attr)判断是否存在该字段,就会找不到,这时就会抛出该异常,因此就必须配置忽略大小写的方法,就不会出现该异常

实体类:

package com.tenghu.core.model;

import com.jfinal.plugin.activerecord.Model;

public class Users extends Model<Users>{
  public static Users dao=new Users();
}

操作数据:

Users users=new Users();
users.set("id", "users_sequence.nextval");
users.set("username", "张三");
users.set("pwd", "sdfsdfs");
users.save();
List<Users> testList=Users.dao.find("select * from users");

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