java mybatis如何操作postgresql array数组类型
作者:libraryhu
这篇文章主要介绍了java mybatis如何操作postgresql array数组类型,具有很好的参考价值,希望对大家有所帮助。如有错误或未考虑完全的地方,望不吝赐教
找了半天没有找到postgresql中关于array数组类型的字段如何对应到java中的数据类型,后来找到了mybatis的TypeHandler,只要实现一个自定义的TypeHandler就行了,如下,
我定义了几个基础数据类型的数组
public class ArrayTypeHandler extends BaseTypeHandler<Object[]> { private static final String TYPE_NAME_VARCHAR = "varchar"; private static final String TYPE_NAME_INTEGER = "integer"; private static final String TYPE_NAME_BOOLEAN = "boolean"; private static final String TYPE_NAME_NUMERIC = "numeric"; @Override public void setNonNullParameter(PreparedStatement ps, int i, Object[] parameter, JdbcType jdbcType) throws SQLException { String typeName = null; if (parameter instanceof Integer[]) { typeName = TYPE_NAME_INTEGER; } else if (parameter instanceof String[]) { typeName = TYPE_NAME_VARCHAR; } else if (parameter instanceof Boolean[]) { typeName = TYPE_NAME_BOOLEAN; } else if (parameter instanceof Double[]) { typeName = TYPE_NAME_NUMERIC; } if (typeName == null) { throw new TypeException("ArrayTypeHandler parameter typeName error, your type is " + parameter.getClass().getName()); } // 这3行是关键的代码,创建Array,然后ps.setArray(i, array)就可以了 Connection conn = ps.getConnection(); Array array = conn.createArrayOf(typeName, parameter); ps.setArray(i, array); } @Override public Object[] getNullableResult(ResultSet resultSet, String s) throws SQLException { return getArray(resultSet.getArray(s)); } @Override public Object[] getNullableResult(ResultSet resultSet, int i) throws SQLException { return getArray(resultSet.getArray(i)); } @Override public Object[] getNullableResult(CallableStatement callableStatement, int i) throws SQLException { return getArray(callableStatement.getArray(i)); } private Object[] getArray(Array array) { if (array == null) { return null; } try { return (Object[]) array.getArray(); } catch (Exception e) { } return null; } }
然后在实体类里面对应的字段配置这个转换器就行,如果是配置文件需要在 xxmap.xml中配置对应属性
@ColumnType(typeHandler = com.mvc.typehandler.ArrayTypeHandler.class) private String[] cities; //所操作的城市code列表,为空表示所有城市 @ColumnType(typeHandler = com.mvc.typehandler.ArrayTypeHandler.class) private String[] areaTypes; //操作的行业类型code列表,为空表示所有行业 @ColumnType(typeHandler = com.jmtool.mvc.typehandler.ArrayTypeHandler.class) private Integer[] targetStatus; //操作的目标数据状态
java mybatis操作 postgresql array数组类型备忘
postgrey sql数据库字段类型varchar[],java使用String[]类型,自定义ArrayTypeHandler
ArrayTypeHandler.java
public class ArrayTypeHandler extends BaseTypeHandler<Object[]> { private static final String TYPE_NAME_VARCHAR = "varchar"; private static final String TYPE_NAME_INTEGER = "integer"; private static final String TYPE_NAME_BOOLEAN = "boolean"; private static final String TYPE_NAME_NUMERIC = "numeric"; @Override public void setNonNullParameter(PreparedStatement ps, int i, Object[] parameter, JdbcType jdbcType) throws SQLException { String typeName = null; if (parameter instanceof Integer[]) { typeName = TYPE_NAME_INTEGER; } else if (parameter instanceof String[]) { typeName = TYPE_NAME_VARCHAR; } else if (parameter instanceof Boolean[]) { typeName = TYPE_NAME_BOOLEAN; } else if (parameter instanceof Double[]) { typeName = TYPE_NAME_NUMERIC; } if (typeName == null) { throw new TypeException("ArrayTypeHandler parameter typeName error, your type is " + parameter.getClass().getName()); } // 这3行是关键的代码,创建Array,然后ps.setArray(i, array)就可以了 Connection conn = ps.getConnection(); Array array = conn.createArrayOf(typeName, parameter); ps.setArray(i, array); } @Override public Object[] getNullableResult(ResultSet resultSet, String s) throws SQLException { return getArray(resultSet.getArray(s)); } @Override public Object[] getNullableResult(ResultSet resultSet, int i) throws SQLException { return getArray(resultSet.getArray(i)); } @Override public Object[] getNullableResult(CallableStatement callableStatement, int i) throws SQLException { return getArray(callableStatement.getArray(i)); } private Object[] getArray(Array array) { if (array == null) { return null; } try { return (Object[]) array.getArray(); } catch (Exception e) { } return null; } }
配置文件中映射配置,增加typeHandler属性,填写ArrayTypeHandler.java的全路径。
<result column="source_type" jdbcType="ARRAY" property="sourceType" typeHandler="com.wang.common.ArrayTypeHandler" />
用到的SQL:
<insert id="insert" parameterType="com.wang.pojo.Qzf"> insert into t_qz_qzf(id,source_type) values (#{id,jdbcType=VARCHAR},#{sourceType,jdbcType=ARRAY,typeHandler="com.wang.common.ArrayTypeHandler"}) </insert>
以上为个人经验,希望能给大家一个参考,也希望大家多多支持脚本之家。