java?mybatis如何操作postgresql?array數(shù)組類型

更新時(shí)間：2022年01月18日 16:46:28 作者：libraryhu

這篇文章主要介紹了java?mybatis如何操作postgresql?array數(shù)組類型，具有很好的參考價(jià)值，希望對(duì)大家有所幫助。如有錯(cuò)誤或未考慮完全的地方，望不吝賜教

我定義了幾個(gè)基礎(chǔ)數(shù)據(jù)類型的數(shù)組

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());
        }
        // 這3行是關(guān)鍵的代碼，創(chuàng)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;
    }
}

然后在實(shí)體類里面對(duì)應(yīng)的字段配置這個(gè)轉(zhuǎn)換器就行，如果是配置文件需要在 xxmap.xml中配置對(duì)應(yīng)屬性

@ColumnType(typeHandler = com.mvc.typehandler.ArrayTypeHandler.class)
private String[] cities; //所操作的城市code列表，為空表示所有城市
@ColumnType(typeHandler = com.mvc.typehandler.ArrayTypeHandler.class)
private String[] areaTypes; //操作的行業(yè)類型code列表，為空表示所有行業(yè)
@ColumnType(typeHandler = com.jmtool.mvc.typehandler.ArrayTypeHandler.class)
private Integer[] targetStatus; //操作的目標(biāo)數(shù)據(jù)狀態(tài)

java mybatis操作 postgresql array數(shù)組類型備忘

postgrey sql數(shù)據(jù)庫字段類型varchar[],java使用String[]類型，自定義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());
        }
        // 這3行是關(guān)鍵的代碼，創(chuàng)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屬性，填寫ArrayTypeHandler.java的全路徑。

<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腳本之家。

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