mybatis中几种typeHandler的定义使用详解
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2022-03-14 22:21:34
1.存储到数据库, 将long数组转换成字符串;从数据库获取数据, 将字符串转为long数组package com.winturn.utils.handler;import java.sql.call...
1.存储到数据库, 将long数组转换成字符串;从数据库获取数据, 将字符串转为long数组
package com.winturn.utils.handler; import java.sql.callablestatement; import java.sql.preparedstatement; import java.sql.resultset; import java.sql.sqlexception; import org.apache.ibatis.type.basetypehandler; import org.apache.ibatis.type.jdbctype; import com.winturn.utils.commonjsonutil; /** * <p>class: arraylongtypehandler.java</p> * <p>description: 存储到数据库, 将long数组转换成字符串; * 从数据库获取数据, 将字符串转为long数组. </p>*/ public class arraylongtypehandler extends basetypehandler<object> { @override public void setnonnullparameter(preparedstatement ps, int i, object parameter, jdbctype jdbctype) throws sqlexception { ps.setstring(i, commonjsonutil.stringify(parameter)); } @override public object getnullableresult(resultset rs, string columnname) throws sqlexception { return commonjsonutil.parse3(rs.getstring(columnname), object.class); } @override public object getnullableresult(resultset rs, int columnindex) throws sqlexception { return commonjsonutil.parse3(rs.getstring(columnindex), object.class); } @override public object getnullableresult(callablestatement cs, int columnindex) throws sqlexception { return commonjsonutil.parse3(cs.getstring(columnindex), object.class); } }
2.存储到数据库, 将基本数据数组转换成字符串;从数据库获取数据, 将字符串根据','拆分,转为数组.
package com.winturn.utils.handler; import java.sql.callablestatement; import java.sql.preparedstatement; import java.sql.resultset; import java.sql.sqlexception; import org.apache.ibatis.type.basetypehandler; import org.apache.ibatis.type.jdbctype; import com.winturn.utils.commonjsonutil; /** * <p>class: arraystringtypehandler.java</p> * <p>description: 存储到数据库, 将基本数据数组转换成字符串; * 从数据库获取数据, 将字符串根据','拆分,转为数组.</p> * * */ public class arraystringtypehandler extends basetypehandler<object> { @override public void setnonnullparameter(preparedstatement ps, int i, object parameter, jdbctype jdbctype) throws sqlexception { ps.setstring(i, commonjsonutil.stringify(parameter)); } @override public object getnullableresult(resultset rs, string columnname) throws sqlexception { return commonjsonutil.parse2(rs.getstring(columnname), object.class); } @override public object getnullableresult(resultset rs, int columnindex) throws sqlexception { return commonjsonutil.parse2(rs.getstring(columnindex), object.class); } @override public object getnullableresult(callablestatement cs, int columnindex) throws sqlexception { return commonjsonutil.parse2(cs.getstring(columnindex), object.class); } }
3.jsonarray 格式的字符串转换为相应的数组
package com.winturn.utils.handler; import java.sql.callablestatement; import java.sql.preparedstatement; import java.sql.resultset; import java.sql.sqlexception; import org.apache.ibatis.type.basetypehandler; import org.apache.ibatis.type.jdbctype; import com.winturn.utils.commonjsonutil; /** * <p>class: arrayintegertypehandler.java</p> * <p>description: jsonarray 格式的字符串转换为相应的数组 </p> * */ public class jsonarraytypehandler extends basetypehandler<object> { @override public void setnonnullparameter(preparedstatement ps, int i, object parameter, jdbctype jdbctype) throws sqlexception { ps.setstring(i, commonjsonutil.stringify(parameter)); } @override public object getnullableresult(resultset rs, string columnname) throws sqlexception { return commonjsonutil.parsejsontoarray(rs.getstring(columnname), object.class); } @override public object getnullableresult(resultset rs, int columnindex) throws sqlexception { return commonjsonutil.parsejsontoarray(rs.getstring(columnindex), object.class); } @override public object getnullableresult(callablestatement cs, int columnindex) throws sqlexception { return commonjsonutil.parsejsontoarray(cs.getstring(columnindex), object.class); } }
4.将float类型的数组装换成字符创进行存储
package com.winturn.utils.handler; import java.sql.callablestatement; import java.sql.preparedstatement; import java.sql.resultset; import java.sql.sqlexception; import org.apache.ibatis.type.basetypehandler; import org.apache.ibatis.type.jdbctype; import com.winturn.utils.commonjsonutil; /** * <p>filename:jsonfloattypehandler.java</p> * <p>description: 将float类型数组装换成字符串 </p> * */ public class jsonfloattypehandler extends basetypehandler<object> { @override public void setnonnullparameter(preparedstatement ps, int i, object parameter, jdbctype jdbctype) throws sqlexception { ps.setstring(i, commonjsonutil.stringifyobject(parameter)); } @override public object getnullableresult(resultset rs, string columnname) throws sqlexception { return commonjsonutil.parsejsontofloat(rs.getstring(columnname), object.class); } @override public object getnullableresult(resultset rs, int columnindex) throws sqlexception { return commonjsonutil.parsejsontofloat(rs.getstring(columnindex), object.class); } @override public object getnullableresult(callablestatement cs, int columnindex) throws sqlexception { return commonjsonutil.parsejsontofloat(cs.getstring(columnindex), object.class); } }
5.将map装换成字符串存储到数据库,取出时将字符串装换成map
package com.winturn.utils.handler; import java.sql.callablestatement; import java.sql.preparedstatement; import java.sql.resultset; import java.sql.sqlexception; import java.sql.types; import java.util.map; import org.apache.ibatis.type.basetypehandler; import org.apache.ibatis.type.jdbctype; import org.codehaus.jackson.map.objectmapper; import com.winturn.exceptions.rolerserviceexception; import com.winturn.utils.jsonmaputil; /** * * @classname: jsonmaptypehandler * @description: 将map装换成数组存储数据库,取出时将字符串装换成map * @author sgl * @date 2015年12月21日 下午6:22:50 */ public class jsonmaptypehandler extends basetypehandler<map<string, object>> { objectmapper mapper = new objectmapper(); @override public map<string, object> getnullableresult(resultset rs, string columnname) { try { string value = rs.getstring(columnname); return mapper.readvalue(value, map.class); } catch (exception e) { } return null; } @override public map<string, object> getnullableresult(resultset rs, int columnindex) throws sqlexception { try { string value = rs.getstring(columnindex); return mapper.readvalue(value, map.class); } catch (exception e) { } return null; } @override public map<string, object> getnullableresult(callablestatement cs, int columnindex) throws sqlexception { try { string value = cs.getstring(columnindex); return mapper.readvalue(value, map.class); } catch (exception e) { } return null; } @override public void setnonnullparameter(preparedstatement ps, int i, map<string, object> parameter, jdbctype jdbctype) throws sqlexception { if (parameter == null) { ps.setnull(i, types.varchar); } else { try { ps.setstring(i, jsonmaputil.getjsonstrbymap(parameter)); } catch (rolerserviceexception e) { e.printstacktrace(); } } } }
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