Mybatis 模糊查詢那點事
阿新 • • 發佈：2021-02-15
實體類：
@Data
public class IdCard {
private Integer id;
private String code;
}@Data
public class Person {
private Integer id;
private String name;
private Integer age;
private String sex;
/**
* 個人證號ID
*/
private IdCard card;
}
直接使用like：
<resultMap id="PersonAndIdCard" type="mybatis.pojo.Person" > <id property="id" column="id" /> <result property="name" column="name" /> <result property="age" column="age" /> <result property="sex" column="sex" /> <association property="card" javaType="mybatis.pojo.IdCard"> <id property="id" column="cardId" /> <result property="code" column="code" /> </association> </resultMap> <select id="findPersonByName" parameterType="String" resultMap="PersonAndIdCard"> SELECT p.id,p.age,p.name,p.sex,p.card_Id as cardId,idcard.code from t_person p,t_idcard idcard where p.card_id=idcard.id and p.name like '%${value}%' </select>
這裡要注意：
執行sql語句：
2021-02-02 16:04:06 [ main:628 ] - [ DEBUG ] org.apache.ibatis.transaction.jdbc.JdbcTransaction.setDesiredAutoCommit(JdbcTransaction.java:101) Setting autocommit to false on JDBC Connection [[email protected]] 2021-02-02 16:04:07 [ main:631 ] - [ DEBUG ] org.apache.ibatis.logging.jdbc.BaseJdbcLogger.debug(BaseJdbcLogger.java:159) ==> Preparing: SELECT p.id,p.age,p.name,p.sex,p.card_Id as cardId,idcard.code from t_person p,t_idcard idcard where p.card_id=idcard.id and p.name like '%張%' 2021-02-02 16:04:07 [ main:683 ] - [ DEBUG ] org.apache.ibatis.logging.jdbc.BaseJdbcLogger.debug(BaseJdbcLogger.java:159) ==> Parameters: 2021-02-02 16:04:07 [ main:705 ] - [ DEBUG ] org.apache.ibatis.logging.jdbc.BaseJdbcLogger.debug(BaseJdbcLogger.java:159) <== Total: 2
換成#的情況下：
sql:
2021-02-02 16:05:23 [ main:626 ] - [ DEBUG ] org.apache.ibatis.logging.jdbc.BaseJdbcLogger.debug(BaseJdbcLogger.java:159) ==> Preparing: SELECT p.id,p.age,p.name,p.sex,p.card_Id as cardId,idcard.code from t_person p,t_idcard idcard where p.card_id=idcard.id and p.name like '%?%'可以看出使用#和使用$區別
但是這樣使用會出錯：
org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: org.apache.ibatis.type.TypeException: Could not set parameters for mapping: ParameterMapping{property='value', mode=IN, javaType=class java.lang.String, jdbcType=null, numericScale=null, resultMapId='null', jdbcTypeName='null', expression='null'}. Cause: org.apache.ibatis.type.TypeException: Error setting non null for parameter #1 with JdbcType null . Try setting a different JdbcType for this parameter or a different configuration property. Cause: java.sql.SQLException: Parameter index out of range (1 > number of parameters, which is 0).
### The error may exist in mybatis/mapper/PersonMapper.xml
### The error may involve mybatis.mapper.PersonMapper.findPersonByNameByLike-Inline
### The error occurred while setting parameters
### SQL: SELECT p.id,p.age,p.name,p.sex,p.card_Id as cardId,idcard.code from t_person p,t_idcard idcard where p.card_id=idcard.id and p.name like '%?%'
### Cause: org.apache.ibatis.type.TypeException: Could not set parameters for mapping: ParameterMapping{property='value', mode=IN, javaType=class java.lang.String, jdbcType=null, numericScale=null, resultMapId='null', jdbcTypeName='null', expression='null'}. Cause: org.apache.ibatis.type.TypeException: Error setting non null for parameter #1 with JdbcType null . Try setting a different JdbcType for this parameter or a different configuration property. Cause: java.sql.SQLException: Parameter index out of range (1 > number of parameters, which is 0).
使用concat這裡只能在Mysql條件下使用：
sql執行如下：
2021-02-02 15:57:58 [ main:648 ] - [ DEBUG ] org.apache.ibatis.transaction.jdbc.JdbcTransaction.setDesiredAutoCommit(JdbcTransaction.java:101) Setting autocommit to false on JDBC Connection [[email protected]]
2021-02-02 15:57:58 [ main:655 ] - [ DEBUG ] org.apache.ibatis.logging.jdbc.BaseJdbcLogger.debug(BaseJdbcLogger.java:159) ==> Preparing: SELECT p.id,p.age,p.name,p.sex,p.card_Id as cardId,idcard.code from t_person p,t_idcard idcard where p.card_id=idcard.id and p.name like concat('%',?,'%')
2021-02-02 15:57:58 [ main:719 ] - [ DEBUG ] org.apache.ibatis.logging.jdbc.BaseJdbcLogger.debug(BaseJdbcLogger.java:159) ==> Parameters: 張(String)
2021-02-02 15:57:58 [ main:752 ] - [ DEBUG ] org.apache.ibatis.logging.jdbc.BaseJdbcLogger.debug(BaseJdbcLogger.java:159) <== Total: 2同樣把#換成$符
執行sql:
2021-02-02 16:13:06 [ main:688 ] - [ DEBUG ] org.apache.ibatis.transaction.jdbc.JdbcTransaction.setDesiredAutoCommit(JdbcTransaction.java:101) Setting autocommit to false on JDBC Connection [[email protected]]
2021-02-02 16:13:06 [ main:691 ] - [ DEBUG ] org.apache.ibatis.logging.jdbc.BaseJdbcLogger.debug(BaseJdbcLogger.java:159) ==> Preparing: SELECT p.id,p.age,p.name,p.sex,p.card_Id as cardId,idcard.code from t_person p,t_idcard idcard where p.card_id=idcard.id and p.name like concat('%',張,'%')
2021-02-02 16:13:06 [ main:731 ] - [ DEBUG ] org.apache.ibatis.logging.jdbc.BaseJdbcLogger.debug(BaseJdbcLogger.java:159) ==> Parameters: 這裡是直接把模糊查詢的字元直接拼接過去了，它並沒有進行字元傳轉換
這個時候的sql查詢如下：
2021-02-02 16:16:57 [ main:730 ] - [ DEBUG ] org.apache.ibatis.transaction.jdbc.JdbcTransaction.setDesiredAutoCommit(JdbcTransaction.java:101) Setting autocommit to false on JDBC Connection [[email protected]]
2021-02-02 16:16:57 [ main:733 ] - [ DEBUG ] org.apache.ibatis.logging.jdbc.BaseJdbcLogger.debug(BaseJdbcLogger.java:159) ==> Preparing: SELECT p.id,p.age,p.name,p.sex,p.card_Id as cardId,idcard.code from t_person p,t_idcard idcard where p.card_id=idcard.id and p.name like concat('%','張','%')
2021-02-02 16:16:57 [ main:781 ] - [ DEBUG ] org.apache.ibatis.logging.jdbc.BaseJdbcLogger.debug(BaseJdbcLogger.java:159) ==> Parameters:
2021-02-02 16:16:57 [ main:807 ] - [ DEBUG ] org.apache.ibatis.logging.jdbc.BaseJdbcLogger.debug(BaseJdbcLogger.java:159) <== Total: 2可以看到執行時是每問題的，因為我們手動給他新增引號了
使用bind:
<select id="findPersonByNameWithBound" parameterType="mybatis.pojo.Person" resultMap="PersonAndIdCard">
<bind name="name" value="'%'+_parameter.getName()+'%'"/>
SELECT p.id,p.age,p.name,p.sex,p.card_Id as cardId,idcard.code
from t_person p,t_idcard idcard
where p.card_id=idcard.id
and p.name like #{name}
</select>
執行的·sql語句：
2021-02-02 16:32:07 [ main:631 ] - [ DEBUG ] org.apache.ibatis.logging.jdbc.BaseJdbcLogger.debug(BaseJdbcLogger.java:159) ==> Preparing: SELECT p.id,p.age,p.name,p.sex,p.card_Id as cardId,idcard.code from t_person p,t_idcard idcard where p.card_id=idcard.id and p.name like ?
2021-02-02 16:32:07 [ main:675 ] - [ DEBUG ] org.apache.ibatis.logging.jdbc.BaseJdbcLogger.debug(BaseJdbcLogger.java:159) ==> Parameters: %張%(String)
2021-02-02 16:32:07 [ main:700 ] - [ DEBUG ] org.apache.ibatis.logging.jdbc.BaseJdbcLogger.debug(BaseJdbcLogger.java:159) <== Total: 2以上就是mybatis 模糊查詢的一些問題