import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SerializerFeature;
import org.apache.ibatis.type.BaseTypeHandler;
import org.apache.ibatis.type.JdbcType;
import org.postgresql.util.PGobject;
import org.springframework.stereotype.Component;
 
import java.sql.CallableStatement;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
 
@Component
public class JOSNBTypeHandler extends BaseTypeHandler<JSON> {
 
    @Override
    public void setNonNullParameter(PreparedStatement ps, int i, JSON parameter, JdbcType jdbcType) throws SQLException {
        if(null != parameter){
            PGobject pGobject = new PGobject();
            pGobject.setType("jsonb");
            pGobject.setValue(toJson(parameter));
            ps.setObject(i, pGobject);
        }
    }
 
    @Override
    public JSON getNullableResult(ResultSet rs, String columnName) throws SQLException {
        String value = rs.getString(columnName);
        return convert(value);
    }
 
    @Override
    public JSON getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
        String value = rs.getString(columnIndex);
        return convert(value);
    }
 
    @Override
    public JSON getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
        String value = cs.getString(columnIndex);
        return convert(value);
    }
 
    private JSON convert(String value){
        if(notNull(value)){
            return (JSON) JSON.parse(value);
        }
        return null;
    }
 
    private boolean notNull(String value){
        return (null != value && !value.isEmpty());
    }
 
    public String toJson(Object obj) {
        return JSON.toJSONString(obj, SerializerFeature.WriteMapNullValue,
                SerializerFeature.WriteNullListAsEmpty, SerializerFeature.WriteNullStringAsEmpty);
    }
}