import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import backStage.exception.SystemException;
import org.apache.commons.lang.StringUtils;
import org.apache.ibatis.type.BaseTypeHandler;
import org.apache.ibatis.type.JdbcType;
import java.io.IOException;
import java.sql.CallableStatement;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class JsonTypeHandler extends BaseTypeHandler {
private final ObjectMapper mapper = new ObjectMapper();
@Override
public void setNonNullParameter(PreparedStatement preparedStatement, int i, Object o, JdbcType jdbcType) throws SQLException {
try {
if (o != null) {
String value = this.mapper.writeValueAsString(o);
preparedStatement.setString(i, value);
}
} catch (JsonProcessingException e) {
e.printStackTrace();
}
}
@Override
public Object getNullableResult(ResultSet resultSet, String s) throws SQLException {
Object o = null;
String value = resultSet.getString(s);
try {
if(!StringUtils.isBlank(value)){
o = this.mapper.readValue(value, Object.class);
}
} catch (IOException e) {
throw new SystemException(e.getMessage(),e);
}
return o;
}
@Override
public Object getNullableResult(ResultSet resultSet, int i) {
return null;
}
@Override
public Object getNullableResult(CallableStatement callableStatement, int i) {
return null;
}
}
注意:如要先数据库存储map格式的数据应该对前台传回的String字符串做如下处理
new ObjectMapper().writeValueAsString(string)