模糊查詢:
工作中用到,寫三種用法吧,第四種為大小寫匹配查詢
1. sql中字串拼接
SELECT * FROM tableName WHERE name LIKE CONCAT(CONCAT('%', #{text}), '%');
2. 使用 ${...} 代替 #{...}
SELECT * FROM tableName WHERE name LIKE '%${text}%';
3. 程式中拼接
Java
// or String searchText = "%" + text + "%";
String searchText = new StringBuilder("%").append(text).append("%").toString();
parameterMap.put("text", searchText);
SqlMap.xml
SELECT * FROM tableName WHERE name LIKE #{text};
4. 大小寫匹配查詢
- SELECT * FROM TABLENAME WHERE UPPER(SUBSYSTEM) LIKE '%' || UPPER('jz') || '%'
- --或者是
- SELECT * FROM TABLENAME WHERE LOWER(SUBSYSTEM) LIKE '%' || LOWER('jz') || '%'
異常:
java.lang.IllegalArgumentException: modify is ambiguous in Mapped Statements collection (try using the full name including the namespace, or rename one of the entries) at org.apache.ibatis.session.Configuration$StrictMap.get(Configuration.java:466) at org.apache.ibatis.session.Configuration.getMappedStatement(Configuration.java:349) at org.apache.ibatis.binding.MapperMethod.setupCommandType(MapperMethod.java:137) at org.apache.ibatis.binding.MapperMethod.<init>(MapperMethod.java:46) at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:34) at $Proxy10.modify(Unknown Source)
丟擲這個異常的原因可能是因為mapper.xml配置檔案中<mapper>的namespace屬性配置錯誤造成的,沒有根據名稱空間的值(全稱類名)找到相應對映介面。
如:<mapper namespace="com.xxx.xxx.mapper.TestMapper" >