1. 使用myibatis3 时，把list 列表中的内容存储到数据库的 varchar 字段中。
2.pojo 类
public class Role implements Serializable {
private Long id; //编号
private String role; //角色标识
private String description; //角色描述
private List<Long> resourceIds; //拥有的资源（要转换的字段）
private Boolean available = Boolean.FALSE; //是否可用
public Role() {
}
public Role(String role, String description, Boolean available) {
this.role = role;
this.description = description;
this.available = available;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getRole() {
return role;
}
public void setRole(String role) {
this.role = role;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public List<Long> getResourceIds() {
if(resourceIds == null) {
resourceIds = new ArrayList<Long>();
}
return resourceIds;
}
public void setResourceIds(List<Long> resourceIds) {
this.resourceIds = resourceIds;
}
public String getResourceIdsStr() {
if(CollectionUtils.isEmpty(resourceIds)) {
return "";
}
StringBuilder s = new StringBuilder();
for(Long resourceId : resourceIds) {
s.append(resourceId);
s.append(",");
}
return s.toString();
}
public void setResourceIdsStr(String resourceIdsStr) {
if(StringUtils.isEmpty(resourceIdsStr)) {
return;
}
String[] resourceIdStrs = resourceIdsStr.split(",");
for(String resourceIdStr : resourceIdStrs) {
if(StringUtils.isEmpty(resourceIdStr)) {
continue;
}
getResourceIds().add(Long.valueOf(resourceIdStr));
}
}
public Boolean getAvailable() {
return available;
}
public void setAvailable(Boolean available) {
this.available = available;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Role role = (Role) o;
if (id != null ? !id.equals(role.id) : role.id != null) return false;
return true;
}
@Override
public int hashCode() {
return id != null ? id.hashCode() : 0;
}
@Override
public String toString() {
return "Role{" +
"id=" + id +
", role='" + role + '\'' +
", description='" + description + '\'' +
", resourceIds=" + resourceIds +
", available=" + available +
'}';
}
}
3.定义类型转换类
import java.sql.CallableStatement;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import org.apache.ibatis.type.JdbcType;
import org.apache.ibatis.type.TypeHandler;
/**
* list 列表存储到数据库时，存储为varchar 类型
*
* @author dell
*
*/
public class ListTypeHandler implements TypeHandler{
@Override
public Object getResult(ResultSet rs, String name) throws SQLException {
String value = rs.getString(name);
String [] array =value.split(",");
List<Long> list = new ArrayList<Long>();
if(null !=array){
int len = array.length;
for(int i=0;i<len;i++){
list.add(Long.parseLong(array[i]));
}
}
return list;
}
@Override
public Object getResult(ResultSet res, int in) throws SQLException {
return null;
}
@Override
public Object getResult(CallableStatement cst, int in) throws SQLException {
List<Long> list = (List<Long>)cst.getObject(in);
return list;
}
/**
*PreparedStatement pst,
* int place, 参数位置
* Object obj, Java类型的对象
* JdbcType type 数据库类型
*
*/
@Override
public void setParameter(PreparedStatement pst, int place, Object obj, JdbcType type) throws SQLException {
@SuppressWarnings("unchecked")
List<Long> b = (List<Long>) obj;
StringBuffer value = new StringBuffer(60);
for(Long l:b){
value.append(l.toString()).append(",");
}
pst.setString(place, value.toString());
}
}
4.注册类型转化类
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!-- 别名 -->
<typeAliases>
<typeAlias type="boce.auth.shiro.pojo.User" alias="user"/>
<typeAlias type="boce.auth.shiro.pojo.Resources" alias="Resources"/>
<typeAlias type="boce.auth.shiro.pojo.Role" alias="Role"/>
</typeAliases>
<typeHandlers>
<typeHandler javaType="java.util.List" jdbcType="VARCHAR"
handler="boce.auth.common.util.ListTypeHandler" />
</typeHandlers>
</configuration>
5. 使用自定义转化类
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="boce.auth.shiro.pojo.Role">
<resultMap type="Role" id="id_role">
<id column="id" property="id" />
<result column="role" property="role" />
<result column="description" property="description"/>
<result column="resource_ids" property="resourceIds" javaType="java.util.List" jdbcType="VARCHAR"/>
<result column="available" property="available" />
</resultMap>
<insert id="id_insert_save" parameterType="Role" >
<selectKey keyProperty="id" order="BEFORE" resultType="Long">
select sql_id.nextval from dual
</selectKey>
insert into sys_role(id, role, description,
resource_ids, available)
values
(#{id}, #{role,jdbcType=VARCHAR}, #{description,jdbcType=VARCHAR},
#{resourceIds,javaType=java.util.List,jdbcType=VARCHAR},
#{available})
</insert>
</mapper>
6.表结构：
create table SYS_ROLE
(
ID NUMBER not null,
ROLE VARCHAR2(100),
DESCRIPTION VARCHAR2(100),
RESOURCE_IDS VARCHAR2(100),
AVAILABLE INTEGER default 0
)；
测试结果：
