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Apache-2.0

agile-sql : 动态sql解析器

设计初衷是为JPA规范下持久层框架提供类似于MyBatis一样的动态sql处理能力,该组件在Alibaba Druid的SQL语法解析能力基础上,增加了根据调用参数动态 判断剔除语法段能力,工具中对sql的语法处理均以MySQL语法为基准,如果需要转换为其他数据库可以全局替换为druid中其他数据库语法解析。

它有什么作用

  • 占位符解析 提供${}动态占位,不对该参数进行注入监测 提供{}普通占位,对该参数进行注入监测

  • 占位符默认值解析 冒号分隔,当占位符key获取不到时,以defaultValue部分语句作为新语句进行替换 提供${key:defaultValue} 提供{key:defaultValue}

  • SQL注入分析 提供生成hibernate风格参数占位,用于hibernate预编译,有效避免sql注入 当参数集中包含注入风险参数时,抛出sql解析异常,防范SQL注入

  • 动态剔除语法段 根据参数集与sql占位符的匹配,当参数为空时,动态剔除对应的语法段,如where条件,select字段等等,并确保最终生成语句可准确执行

  • 生成count语句 提供sql动态解析同时,根据查询语句生成有效的count查询语句,一般用于分页功能,提供总条数计数能力

  • in语句 支持将集合参数分解成in语句条件,实现类似mybatis的循环语句


快速入门

开始你的第一个项目是非常容易的。

步骤 1: 下载包

您可以从[最新稳定版本]下载包(https://github.com/mydeathtrial/agile-sql/releases). 该包已上传至maven中央仓库,可在pom中直接声明引用

以版本agile-sql-2.1.0.M5.jar为例。

步骤 2: 添加maven依赖

<!--声明中央仓库-->
<repositories>
    <repository>
        <id>cent</id>
        <url>https://repo1.maven.org/maven2/</url>
    </repository>
</repositories>
        <!--声明依赖-->
<dependency>
<groupId>cloud.agileframework</groupId>
<artifactId>agile-sql</artifactId>
<version>2.1.0.M5</version>
</dependency>

步骤 3: 程序中调用SqlUtil(例)

参数集:parserSQL第二个参数作为参数集,程序将从参数集中取出sql占位符中声明的key值对应的参数,并将其替换到sql语句中,占位符使用大括号形式,例{key} ,占位符可以是最终值的一部分,如 模糊查询条件占位columnA like '%{key}%'。程序并除in条件语句外,不会为任何参数添加单引号处理,是否添加单引号可以于调用动态SQL处理前自行添加。

public class YourClass {
    public void test() {
        //声明参数集,参数集也可以是pojo对象,并支持对象嵌套,多层参数时使用点分隔形式声明占位符
        Map<String, Object> param = Maps.newHashMap();
        param.put("a", "aColumn");
        param.put("b", "b");
        param.put("c", 12);
        param.put("d", new String[]{"c1", "c2"});

        //举例使用嵌套对象
        Demo g = new Demo();
        g.setC(Lists.newArrayList("in1", "in2"));
        param.put("g", g);

        String sql = SqlUtil.parserSQL("select {a},bColumn from your_table " +
         "where c = {c} and d in {d} and e = {e} and f in {f} or g in {g}",param);
        logger.debug(sql);
    }

    private static class Demo {
        private List<Object> c;

        public List<Object> getC() {
            return c;
        }

        public void setC(List<Object> c) {
            this.c = c;
        }
    }

}

结果日志

SELECT aColumn, bColumn
FROM your_table
WHERE c = 12
	AND d IN ('c1', 'c2')
	OR g IN ('in1', 'in2')

步骤 4: count语句

使用方法同SqlUtil.parserSQL相同,方法为SqlUtil.parserCountSQL,其返回结果为count查询语句

public class Test{
    public void test(){
        String sql = SqlUtil.parserSQL("select {a},bColumn from your_table where c = {c} and d in {d} and e = {e} and f in {f} or g in {g}",param);
    }
}

结果日志

select count(1) from (SELECT aColumn, bColumn
FROM your_table
WHERE c = 12
	AND d IN ('c1', 'c2')
	OR g IN ('in1', 'in2')) _select_table
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简介

动态sql解析器 设计初衷是为JPA规范下持久层框架提供类似于MyBatis一样的动态sql处理能力,该组件在Alibaba Druid的SQL语法解析能力基础上,增加了根据调用参数动态 判断剔除语法段能力 展开 收起
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