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JFinal对oracle数据库的操作配置

2016-06-23 15:41 483 查看
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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