java?mybatis如何操作postgresql?array数组类型

来源：jb51　　时间：2022/1/19 9:43:09　　对本文有异议

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>