针对oracle中in操作超过1000个参数 会抛异常 处理实例

/**
* 将千条参数切成等分拼sql查询，提高查询效率
* @author Fantasy
*/
public class OracleSQUtils {

/**
* @param ids 存储多个id的List集合
* @param count 将多个id按count切成等分拼接
* @param field 数据库表对应字段
* @return 返回拼接语句 如 id in (1,2,3....1000) or id in (1001,1002,1003....2000) or ....
*/
public static String getOracleSQLIn(List<?> ids, int count, String field) {
count = Math.min(count, 1000);
int len = ids.size();
int size = len % count;
if (size == 0) {
size = len / count;
} else {
size = (len / count) + 1;
}
StringBuilder builder = new StringBuilder();
for (int i = 0; i < size; i++) {
int fromIndex = i * count;
int toIndex = Math.min(fromIndex + count, len);
//System.out.println(ids.subList(fromIndex, toIndex));
String productId = StringUtils.defaultIfEmpty(StringUtils.join(ids.subList(fromIndex, toIndex), "','"), "");
if (i != 0) {
builder.append(" or ");
}
builder.append(field).append(" in ('").append(productId).append("')");
}
return StringUtils.defaultIfEmpty(builder.toString(), field + " in ('')");
}

}

<select id="querySomeInfoByIds" resultType="HashMap" parameterType="HashMap">
select dept_id,dept_name from dept a
where 1=1

<!--优化前：基于oracle数据库做in查询时，下面的通常写法，当deptIds达到1000个以上时，oracle会报错 -->
<if test="deptIds!= null">
AND a.DEPT_ID IN
<foreach item="item" index="index" collection="deptIds" open="(" separator="," close=")">
#{item}
</foreach>
</if>

<!-- 优化后：将传入的多个id在业务代码中按适当等分拼接好传入mybatis文件中，提升查询效率和避开超过1000个id时oracle数据库抛异常 -->
and ( ${deptIds} )

<!-其它普通参数->
<if test="param!= null and param!= ''">
AND a.param =#{param}
</if>
....
</select>

//deptIdList 中存储数千个deptId
String deptIds=OracleSQUtils.getOracleSQLIn(deptIdList,1000,"a.DEPT_ID");
HashMap<String,Object> params=new HashMap<String,Object>();
params.put("deptIds",deptIds);
List<HashMap<String,Object>> resultList=deptService.querySomeInfoByIds(params);