mybatis中json数据的插入与查询

最新推荐文章于 2025-03-30 21:16:37 发布

微风轻吟挽歌

最新推荐文章于 2025-03-30 21:16:37 发布

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文章标签： mybatis json

本文链接：https://blog.youkuaiyun.com/weixin_63558979/article/details/145508526

版权

1.ListTypeHandler

import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.StrUtil;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import org.apache.ibatis.type.BaseTypeHandler;
import org.apache.ibatis.type.JdbcType;
import org.apache.ibatis.type.MappedJdbcTypes;
import org.apache.ibatis.type.MappedTypes;

import java.sql.CallableStatement;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;


@MappedJdbcTypes(JdbcType.VARBINARY)
@MappedTypes({List.class})
public abstract class ListTypeHandler<T> extends BaseTypeHandler<List<T>> {

    @Override
    public void setNonNullParameter(PreparedStatement ps, int i, List<T> parameter, JdbcType jdbcType) throws SQLException {
        String content = CollUtil.isEmpty(parameter) ? null : JSON.toJSONString(parameter);
        ps.setString(i, content);
    }

    @Override
    public List<T> getNullableResult(ResultSet rs, String columnName) throws SQLException {
        return this.getListByJsonArrayString(rs.getString(columnName));
    }

    @Override
    public List<T> getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
        return this.getListByJsonArrayString(rs.getString(columnIndex));
    }

    @Override
    public List<T> getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
        return this.getListByJsonArrayString(cs.getString(columnIndex));
    }


    private List<T> getListByJsonArrayString(String content) {
        return StrUtil.isBlank(content) ? new ArrayList<>() : JSON.parseObject(content, this.specificType());
    }

    /**
     * 具体类型，由子类提供
     *
     * @return 具体类型
     */
    protected abstract TypeReference<List<T>> specificType();


}

2.StringListTypeHandler

import com.alibaba.fastjson.TypeReference;

import java.util.List;

public class StringListTypeHandler extends ListTypeHandler<String> {

    @Override
    protected TypeReference<List<String>> specificType() {
        return new TypeReference<List<String>>() {
        };
    }

}