目录 前言 要求: 分析: 代码: 测试: 总结: 前言 在处理sql参数的时候,替换圆括号里面只处理了一种情况。而没有从整体上进行处理!!! 这是一个思考问题上严重的偏向。 考虑
目录
- 前言
- 要求:
- 分析:
- 代码:
- 测试:
- 总结:
前言
在处理sql参数的时候,替换圆括号里面只处理了一种情况。而没有从整体上进行处理!!!
这是一个思考问题上严重的偏向。 考虑问题时候,要先从整体开始考虑,逐步分解,再细分到局部!
要求:
替换sql里面的参数:
SELECT a.table_id, a.table_title, a.table_name, a.table_serial, b.STAFF_NAME , b.REGION_NAME, b.operatingsystem, b.renduoxuan FROM table_basic a, table_177 b WHERE a.table_id = b.table_id AND a.table_serial in ($formSerial) and a.create_date >= $createStartDate AND a.create_date <= $createEndDate or a.state like '%$state%' AND b.tickettitle in ($tickettitle) GROUP BY a.table_id ORDER BY state_date DESC
参数:
Map<String, Object> sqlParam = new HashMap<>(); sqlParam.put("state", "A,F"); sqlParam.put("tableSerial", "COM, tt");
对于参数里面有的值进行替换,没有的值,替换为空。
分析:
sql 里面支持大小写,替换的时候,要处理大小写。
常见的sql条件里面有: where、in、or、like
如果where 后面的条件都为空 设置为 1 = 1
前面条件的正则:
\\s+(where|WHERE|and|AND|or|OR)(\\s+[a-zA-Z0-9_.]+)(\\s*(IN|in|=|>=|>|<|<=|like|LIKE)+)
String condition = "\\s+(where|WHERE|and|AND|or|OR)(\\s+[a-zA-Z0-9_.]+)(\\s*(IN|in|=|>=|>|<|<=|like|LIKE)+)";
后面条件的正则:
带like: \s*\(*'%\$([a-zA-Z_.]*)%'\)*
其它: \s*\(*\$([a-zA-Z_.]*)\)*
两个不好合并在一起处理,就分开来。
代码:
public static String replaceConditionStr(String content, Map<String, Object> param) { String likeCondition = "\\s*\\(*\'%\\$([a-zA-Z_.]*)%\'\\)*"; content = replaceOtherConditionStr(content, param, likeCondition); String otherCondition = "\\s*\\(*\\$([a-zA-Z_.]*)\\)*"; return replaceOtherConditionStr(content, param, otherCondition); } public static String replaceOtherConditionStr(String content, Map<String, Object> param, String paramConfition) { String condition = "\\s+(where|WHERE|and|AND|or|OR)(\\s+[a-zA-Z0-9_.]+)(\\s*(IN|in|=|>=|>|<|<=|like|LIKE)+)"; String pattern = condition + paramConfition; Pattern p = Pattern.compile(pattern); Matcher m = p.matcher(content); while (m.find()) { String group = m.group(); String operator = m.group(4); String key = m.group(5); if (key.contains(".")) { key = StringUtils.substringAfter(key, "."); } String value = MapUtils.getString(param, key); if (StringUtils.isBlank(value)) { if (group.contains("WHERE") || group.contains("where")) { content = content.replace(group, " where 1 = 1 "); } content = content.replace(group, ""); } else { if ("like".equals(operator) || "LIKE".equals(operator)) { if (!group.contains("%")) { value = ("\'%").concat(value).concat("%\'"); } } else { if ("in".equals(operator) || "IN".equals(operator)) { List<String> valueArr = Arrays.asList(value.split(",")); value = ListUtils.emptyIfNull(valueArr).stream().map(s -> "\'" + s.trim() + "\'") .collect(Collectors.joining(",")); } else { value = ("\'").concat(value).concat("\'"); } } content = content.replace("$" + key, value); } } return content; }
测试:
public static void main(String[] args) { testSqlEmpty(); testSqlReplace(); } public static void testSqlEmpty() { String sqlContent = "SELECT a.table_id, a.table_title, a.table_name, a.table_serial, b.STAFF_NAME , b.REGION_NAME, " + " b.operatingsystem, b.renduoxuan FROM table_basic a, table_177 b WHERE " + " a.table_serial in ($formSerial) and a.create_date >= $createStartDate " + "AND a.create_date <= $createEndDate or a.state like '%$state%' " + "AND b.tickettitle in ($tickettitle) GROUP BY a.table_id ORDER BY state_date DESC"; Map<String, Object> sqlParam = new HashMap<>(); System.out.println("empty param: "+replaceConditionStr(sqlContent, sqlParam)); } public static void testSqlReplace() { String sqlContent = "SELECT a.table_id, a.table_title, a.table_name, a.table_serial, b.STAFF_NAME , b.REGION_NAME, " + " b.operatingsystem, b.renduoxuan FROM table_basic a, table_177 b WHERE a.table_id = b.table_id " + "AND a.table_serial in ($formSerial) and a.create_date >= $createStartDate " + "AND a.create_date <= $createEndDate or a.state like '%$state%' " + "AND b.tickettitle in ($tickettitle) GROUP BY a.table_id ORDER BY state_date DESC"; Map<String, Object> sqlParam = new HashMap<>(); sqlParam.put("state", "A,F"); sqlParam.put("tableSerial", "COM, tt"); System.out.println("have param: "+replaceConditionStr(sqlContent, sqlParam)); }
empty param: SELECT a.table_id, a.table_title, a.table_name, a.table_serial, b.STAFF_NAME , b.REGION_NAME, b.operatingsystem, b.renduoxuan FROM table_basic a, table_177 b where 1 = 1 GROUP BY a.table_id ORDER BY state_date DESC have param: SELECT a.table_id, a.table_title, a.table_name, a.table_serial, b.STAFF_NAME , b.REGION_NAME, b.operatingsystem, b.renduoxuan FROM table_basic a, table_177 b WHERE a.table_id = b.table_id or a.state like '%A,F%' GROUP BY a.table_id ORDER BY state_date DESC
总结:
处理问题的时候,先从整体考虑,全面把握,再细化到局部。如果完全没头绪,再从局部开始寻找突破。
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