當(dāng)執(zhí)行sql語句，返回的是map類型時(shí)， 比如

public List<Map<String, Object>> query(@Param('sql') String sql)

得到的數(shù)據(jù)是List<Map>類型數(shù)據(jù)，此時(shí)，如果有返回的有clob字段時(shí)，數(shù)據(jù)是這樣的oracle.sql.CLOB@63636de0 ，顯然，這不是我想要的，我需要的是字符串?dāng)?shù)據(jù)

就是定義類型處理器，來專門處理Clob字段，將Clob數(shù)據(jù)轉(zhuǎn)換為字符串?dāng)?shù)據(jù)返回

@MappedJdbcTypes(JdbcType.CLOB)public class ClobTypeHandle extends BaseTypeHandler<Object> { @Override public void setNonNullParameter(PreparedStatement ps, int i, Object parameter, JdbcType jdbcType) throws SQLException {ps.setObject(i, parameter); } @Override public Object getNullableResult(ResultSet rs, String columnName) throws SQLException {return rs.getString(columnName); } @Override public Object getNullableResult(ResultSet rs, int columnIndex) throws SQLException {return rs.getString(columnIndex); } @Override public Object getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {return cs.getString(columnIndex); }}Mybatis 大字段clob處理1. 實(shí)體類View

package com.ttt.sysManager.po;public class View { private String VIEW_NAME; private String TEXT_LENGTH; private String TEXT;<span style='white-space:pre'> </span>// clob大字段 private String EDITIONING_VIEW; private String READ_ONLY;// ...（get、set方法）}2. Dao

List<View> getViewByPage(Map<String, Object> map);3. XML

<resultMap type='com.ttt.sysManager.po.View'> <result property='VIEW_NAME' column='VIEW_NAME'/><result property='TEXT_LENGTH' column='TEXT_LENGTH'/> <result property='TEXT' column='TEXT' javaType='String' jdbcType='VARBINARY'/> <result property='EDITIONING_VIEW' column='EDITIONING_VIEW' /> <result property='READ_ONLY' column='READ_ONLY' /> </resultMap> <select parameterType='map' resultMap='viewResultMap' > SELECT VIEW_NAME,TEXT_LENGTH,TEXT,EDITIONING_VIEW,READ_ONLY FROM ( SELECT A.*, ROWNUM RN FROM (SELECT * FROM user_views) A WHERE ROWNUM <![CDATA[<=]]> #{endRow} ) WHERE RN <![CDATA[>]]> #{startRow}</select>4. 寫入

寫入大字段與普通寫入無區(qū)別，但是數(shù)據(jù)庫字段類型需為clob，如為blob會(huì)報(bào)錯(cuò)，暫不解決。

以上為個(gè)人經(jīng)驗(yàn)，希望能給大家一個(gè)參考，也希望大家多多支持好吧啦網(wǎng)。