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README
Apache-2.0

Freesql 基于FreeMarker自由的动态sql框架

Freesql是基于Java的动态sql框架,可以简单快速的使用FreeMarker语法构建动态sql。

使用指南

如何在JFinal中使用Freesql

Freesql默认提供了基于JFinal的插件,可以在JFinal中直接使用Freesql。

#初始化Freesql 在JFinalConfig中添加Freesql插件

public class ProjectConfig extends JFinalConfig {
    //...
    @Override
    public void configPlugin(Plugins me) {
        //Freesql默认使用web根目录下的freesql作为模板存放根目录
        FreesqlPlugin freesql = new FreesqlPlugin();  

        //设置Freesql的模板存放目录为web根目录下的sql文件夹
        //FreesqlPlugin freesql = new FreesqlPlugin("sql");
        me.add(freesql);
    }
}

#扩展Model JFinal的dao对象是继承自com.jfinal.plugin.activerecord.Model,Freesql在该块原有的功能上针对模板进行了扩展,在使用时需要替换原先Model的导入定义。

import com.freesql.jfinal.Model;

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

#####根据模板使用分页功能

public class UserController extends Controller{
    public void list() {
        Page<User> page = User.dao.paginateByTemp(getParaToInt("page"), getParaToInt("rows"), 
                "test/test.ftl", this.getParaMap());
        renderJson(page);
    }
}

#编写模板 用FreeMarker语法编写sql,动态、方便。简单的传值无法满足你时,可以使用函数进行解析。 Freesql默认用{值}的方式,设置sql查询参数。当普通的sql传值无法满足你时,可以Freesql函数,Freesql函数的使用方法为 {函数名(值[,值])} 如: {like(name)},需要存入多个值时可以用逗号分割参数:{func(paramA, paramB)}

#####模板test.ftl

SELECT
    * FROM user
WHERE 1 = 1
<#if username??>
    AND username {like(username)} #使用Freesql函数likeusername为参数名,此处为页面提交的值
</#if>
<#if status??>
    AND status = {status}         #使用status作为参数,此处为页面提交的值
</#if>

#####Html页面

    <form id="s_form">
        用户名:<input text="input" name="username" />
        状态:
        <select name="status">
            <option value="">所有</option>
            <option value="1">有效</option>
            <option value="0">无效</option>
        </select>
        <input type="submit" />
    </form>

扩展函数

当Freesql默认函数无法满足你时,可以自定义函数,并添加到Freesql中。

public class LikeFunction implements FreesqlFunction {

    /**
     * 基于函数参数,及Map对象,返回sql参数列表,
     * 该方法返回的sql参数列表应该与sqlReplace的参数相对应
     *
     * @param funcParas     函数参数字符串
     * @param requestParams 参数值
     * @return sql参数列表
     * @throws com.freesql.function.FunctionParamsException
     */
    @Override
    public List<String> setSqlParas(String funcParas, Map<String, Object> requestParams) throws FunctionParamsException {
        List<String> list = new ArrayList<String>();
        String value = requestParams.get(funcParas.trim());
        list.add('%' + value + '%');
        return list;
    }



    /**
     * 对sql的函数片段进行替换
     *
     * @param funcParas 函数参数字符串
     * @return sql函数替换结果
     */
    @Override
    public String sqlReplace(String funcParas) {
        return "LIKE ?";
    }
}

#####注册函数到Freesql中

public class ProjectConfig extends JFinalConfig {
    //...
    @Override
    public void configPlugin(Plugins me) {
        FreesqlPlugin freesql = new FreesqlPlugin();
        freesql.add("like", new LikeFunction());
        me.add(freesql);
    }
}
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基于FreeMarker,自由的动态sql 支持JFinal 展开 收起
Java
Apache-2.0
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