Mybatis各種模糊查詢

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中字符串拼接

   SELECT * FROM tableName WHERE name LIKE CONCAT(CONCAT('%', #{text}), '%');

 

2. 使用 ${...} 代替 #{...}

   SELECT * FROM tableName WHERE name LIKE '%${text}%'; 

 

3. 程序中拼接

   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') || '%'

   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)

 

拋出這個異常的原因可能是因為mapper.xml配置文件中<mapper>的namespace屬性配置錯誤造成的，沒有根據命名空間的值（全稱類名）找到相應映射接口。

 

如：<mapper namespace="com.xxx.xxx.mapper.TestMapper" >