Flink Table 数据类型及Stream转Table实战和 Flink假（模拟、mock）数据生成工具

列举的flink Table API的数据类型。并生成与这些类型匹配的数据。

同时比较了DataType或LoglicalType默认conversionClass与Flink Table API中规定的内部类型的conversionClass的异同。

一、添加maven pom依赖

用于生成假数据。

xml 复制代码

    <dependency>
      <groupId>net.datafaker</groupId>
      <artifactId>datafaker</artifactId>
      <version>1.6.0</version>
      <scope>test</scope>
    </dependency>

二、生成假数据的工具类

注意：此类生成的数据类型是FlinkTable API规定的内部数据类型。

java 复制代码

import lombok.Data;
import net.datafaker.Address;
import net.datafaker.Faker;
import net.datafaker.Internet;
import net.datafaker.Name;
import org.apache.flink.table.api.DataTypes;
import org.apache.flink.table.data.DecimalData;
import org.apache.flink.table.data.StringData;
import org.apache.flink.table.data.TimestampData;
import org.apache.flink.table.types.DataType;

import java.math.BigDecimal;
import java.time.*;
import java.util.Locale;
import java.util.Random;
import java.util.function.Supplier;

/**
 * @author: 
 * @create: 
 * @Description: 注意：只能生成Flink Table的内部类型数据！！！
 */
public class FlinkInternalDataFakers {

    private FlinkInternalDataFakers() {
    }

    @Data
    public abstract static class FLinkInternalDataFaker<OUT> implements Supplier<OUT>{
        protected String name;

        public FLinkInternalDataFaker(String name) {
            this.name=name;
        }

        protected abstract DataType getProducedDataType();

    }

    private static abstract class CharFakerBase extends FLinkInternalDataFaker<StringData> {
        private final Faker faker = new Faker(Locale.CHINA);
        private final Name name = faker.name();
        private final Random random = new Random();
        protected final int len;
        public final static int INDEX_MIN = 0;
        public final static int INDEX_MAN = 128;

        public CharFakerBase(String name,int len) {
            super(name);
            this.len = len;
        }

        public StringData get() {
            String nm = name.fullName();
            String str = nm.substring(0, Math.min(len, nm.length()));
            return StringData.fromString(str);
        }

    }

    public static class CharFaker extends CharFakerBase {

        public CharFaker(String name,int len) {
            super(name,len);
        }

        @Override
        public DataType getProducedDataType() {
            return DataTypes.CHAR(len).bridgedTo(StringData.class);
        }
    }

    public static class VarCharFaker extends CharFakerBase {

        public VarCharFaker(String name,int len) {
            super(name,len);
        }

        @Override
        public DataType getProducedDataType() {
            return DataTypes.VARCHAR(len).bridgedTo(StringData.class);
        }
    }

    public static class StringDataFaker extends FLinkInternalDataFaker<StringData> {
        final Faker faker = new Faker(Locale.CHINA);
        final Name name = faker.name();
        final Address address = faker.address();
        final Internet internet = faker.internet();

        public StringDataFaker(String name) {
            super(name);
        }

        public StringData get() {
            return StringData.fromString(name.name() + "|" + address.city() + "|" + internet.emailAddress());
        }

        @Override
        public DataType getProducedDataType() {
            return DataTypes.STRING().bridgedTo(StringData.class);
        }
    }

    public static class BooleanFaker extends FLinkInternalDataFaker<Boolean> {
        private final Random random = new Random();

        public BooleanFaker(String name) {
            super(name);
        }

        @Override
        public Boolean get() {
            return random.nextBoolean();
        }

        @Override
        public DataType getProducedDataType() {
            return DataTypes.BOOLEAN();
        }
    }

    private static abstract class BinaryFakerBase extends FLinkInternalDataFaker<byte[]> {
        private final Faker faker = new Faker(Locale.CHINA);

        protected final int len;

        public BinaryFakerBase(String name,int len) {
            super(name);
            this.len = len;
        }

        @Override
        public byte[] get() {
            String s = faker.name().fullName();
            byte[] bytes = s.getBytes();
            byte[] output = new byte[len];
            System.arraycopy(bytes, 0, output, 0, Math.min(len, bytes.length));
            return output;
        }


    }

    public static class BinaryFaker extends BinaryFakerBase {
        public BinaryFaker(String name,int len) {
            super(name,len);
        }

        @Override
        public DataType getProducedDataType() {
            return DataTypes.BINARY(len);
        }
    }

    public static class VarBinaryFaker extends BinaryFakerBase {
        public VarBinaryFaker(String name,int len) {
            super(name,len);
        }

        @Override
        public DataType getProducedDataType() {
            return DataTypes.VARBINARY(len);
        }
    }

    public static class BytesFaker extends FLinkInternalDataFaker<byte[]> {
        private final Faker faker = new Faker(Locale.CHINA);
        private final Name nameFaker = faker.name();

        public BytesFaker(String name) {
            super(name);
        }


        @Override
        public byte[] get() {
            return nameFaker.fullName().getBytes();
        }

        @Override
        public DataType getProducedDataType() {
            return DataTypes.BYTES();
        }
    }


    public static class DecimalDataFaker extends FLinkInternalDataFaker<DecimalData> {
        private final Random random = new Random();
        private final int precision;
        private final int scale;

        public DecimalDataFaker(String name,int precision, int scale) {
            super(name);
            this.precision = precision;
            this.scale = scale;
        }

        @Override
        public DecimalData get() {
            long itg = random.nextInt((int)Math.pow(10,precision-scale));
            double dbl = random.nextDouble();
            double dig = dbl % 1;
            double dcm = itg + dig;
            String str = String.format("%." + scale + "f", dcm);
            BigDecimal bigDecimal = new BigDecimal(str);
            return DecimalData.fromBigDecimal(bigDecimal, precision, scale);
        }

        @Override
        public DataType getProducedDataType() {
            return DataTypes.DECIMAL(precision,scale).bridgedTo(DecimalData.class);
        }
    }

    public static class TinyIntFaker extends FLinkInternalDataFaker<Byte> {
        private final Random random = new Random();

        public TinyIntFaker(String name) {
            super(name);
        }

        @Override
        public Byte get() {
            return (byte) random.nextInt(128);
        }

        @Override
        public DataType getProducedDataType() {
            return DataTypes.TINYINT();
        }
    }

    public static class SmallIntFaker extends FLinkInternalDataFaker<Short> {
        private final Random random = new Random();

        public SmallIntFaker(String name) {
            super(name);
        }

        @Override
        public Short get() {
            return (short) random.nextInt();
        }

        @Override
        public DataType getProducedDataType() {
            return DataTypes.SMALLINT();
        }
    }

    public static class IntFaker extends FLinkInternalDataFaker<Integer> {
        private final Random random = new Random();

        public IntFaker(String name) {
            super(name);
        }

        @Override
        public Integer get() {
            return random.nextInt();
        }

        @Override
        public DataType getProducedDataType() {
            return DataTypes.INT();
        }
    }

    public static class BigIntFaker extends FLinkInternalDataFaker<Long> {
        private final Random random = new Random();

        public BigIntFaker(String name) {
            super(name);
        }

        @Override
        public Long get() {
            return random.nextLong();
        }

        @Override
        public DataType getProducedDataType() {
            return DataTypes.BIGINT();
        }
    }

    public static class FloatFaker extends FLinkInternalDataFaker<Float> {
        private final Random random = new Random();

        public FloatFaker(String name) {
            super(name);
        }

        @Override
        public Float get() {
            return random.nextFloat()*(float)Math.pow(10,random.nextInt(9));
        }

        @Override
        public DataType getProducedDataType() {
            return DataTypes.FLOAT();
        }
    }

    public static class DoubleFaker extends FLinkInternalDataFaker<Double> {
        private final Random random = new Random();

        public DoubleFaker(String name) {
            super(name);
        }

        @Override
        public Double get() {
            return random.nextDouble()*Math.pow(10,random.nextInt(9));
        }

        @Override
        public DataType getProducedDataType() {
            return DataTypes.DOUBLE();
        }
    }

    public static class DateFaker extends FLinkInternalDataFaker<Integer> {
        private final Random random = new Random();
        int MAX_DATE = (int)LocalDate.of(2099, 12, 31).toEpochDay();

        public DateFaker(String name) {
            super(name);
        }

        @Override
        public Integer get() {
            return random.nextInt(MAX_DATE);
        }

        @Override
        public DataType getProducedDataType() {
            return DataTypes.DATE().bridgedTo(Integer.class);
        }
    }

    public static class TimeFaker extends FLinkInternalDataFaker<Integer> {
        public static final int SECOND_OF_DAY = 24 * 60 * 60;
        private final Random random = new Random();
        private final int scale;

        public TimeFaker(String name,int scale) {
            super(name);
            this.scale = scale;
        }

        @Override
        public Integer get() {
            int sec = random.nextInt(SECOND_OF_DAY);
            int milli = random.nextInt(1_000);
            return sec * 1_000 + milli;
        }

        @Override
        public DataType getProducedDataType() {
            return DataTypes.TIME(scale).bridgedTo(Integer.class);
        }
    }

    public static class TimestampFaker extends FLinkInternalDataFaker<TimestampData> {
        private final Random random = new Random();
        private final int scale;

        public static final long MAX_SECONDS = LocalDateTime.of(LocalDate.of(2099, 12, 31), LocalTime.MAX).toEpochSecond(ZoneOffset.of("+8"));
        public static final int MAX_NANO_SECONDS = 999_999_999;

        public TimestampFaker(String name,int scale) {
            super((name));
            this.scale = scale;
        }

        @Override
        public TimestampData get() {
            long l = Math.abs(random.nextLong());
            long secs = l % MAX_SECONDS;
            int nanos = random.nextInt((int) Math.pow(10, scale)) * (int)Math.pow(10,(9 - scale));
            LocalDateTime localDateTime = LocalDateTime.ofEpochSecond(secs, nanos, ZoneOffset.UTC);
            return TimestampData.fromLocalDateTime(localDateTime);
        }

        @Override
        public DataType getProducedDataType() {
            return DataTypes.TIMESTAMP(scale).bridgedTo(TimestampData.class);
        }
    }
}

三、编写 SourceFunction 生成数据。

内含启动main函数入口。
DataStream<RowData> --> DataStream<Row> --> Table 的流程。最终打印模拟数据。

其中的 RowUtils 工具类，请参考Flink RowData 与 Row 相互转化工具类

java 复制代码

import com.h3c.it_bigdata.module.transfer.util.RowUtils;
import lombok.AllArgsConstructor;
import lombok.Data;
import org.apache.flink.streaming.api.datastream.DataStreamSource;
import org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.source.ParallelSourceFunction;
import org.apache.flink.table.api.DataTypes;
import org.apache.flink.table.api.Schema;
import org.apache.flink.table.api.Table;
import org.apache.flink.table.api.bridge.java.StreamTableEnvironment;
import org.apache.flink.table.data.*;
import org.apache.flink.table.runtime.typeutils.InternalTypeInfo;
import org.apache.flink.table.types.DataType;
import org.apache.flink.table.types.logical.RowType;
import org.apache.flink.table.types.utils.DataTypeUtils;
import org.apache.flink.types.Row;
import org.apache.flink.types.RowKind;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.function.Supplier;

public class FlinkFakeTypeSourceFunc implements ParallelSourceFunction<RowData> {
    private final int interval;

    public FlinkFakeTypeSourceFunc(int interval) {
        this.interval = interval;
    }

    public static final FlinkInternalDataFakers.FLinkInternalDataFaker<?>[] typeFakerArr;
    public final static DataType rowDataType;
    public final RowKind[] ROW_KINDS = new RowKind[]{RowKind.INSERT, RowKind.UPDATE_AFTER, RowKind.UPDATE_BEFORE, RowKind.DELETE};

    static {
        List<FlinkInternalDataFakers.FLinkInternalDataFaker<?>> fakers = new ArrayList<>();

        FlinkInternalDataFakers.CharFaker char10Faker = new FlinkInternalDataFakers.CharFaker("char10",10);
        fakers.add(char10Faker);
        FlinkInternalDataFakers.VarCharFaker varChar10Faker = new FlinkInternalDataFakers.VarCharFaker("varchar10", 10);
        fakers.add(varChar10Faker);
        FlinkInternalDataFakers.StringDataFaker stringDataFaker = new FlinkInternalDataFakers.StringDataFaker("string");

        fakers.add(stringDataFaker);
        FlinkInternalDataFakers.BooleanFaker booleanFaker = new FlinkInternalDataFakers.BooleanFaker("boolean");
        fakers.add(booleanFaker);
        FlinkInternalDataFakers.DecimalDataFaker decimalData103Faker = new FlinkInternalDataFakers.DecimalDataFaker("decimal103",10, 3);
        fakers.add(decimalData103Faker);
        FlinkInternalDataFakers.TinyIntFaker tinyIntFaker = new FlinkInternalDataFakers.TinyIntFaker("tinyint");
        fakers.add(tinyIntFaker);
        FlinkInternalDataFakers.SmallIntFaker smallIntFaker = new FlinkInternalDataFakers.SmallIntFaker("smallint");
        fakers.add(smallIntFaker);
        FlinkInternalDataFakers.IntFaker intFaker = new FlinkInternalDataFakers.IntFaker("integer");
        fakers.add(intFaker);
        FlinkInternalDataFakers.BigIntFaker bigIntFaker = new FlinkInternalDataFakers.BigIntFaker("bigint");
        fakers.add(bigIntFaker);
        FlinkInternalDataFakers.FloatFaker floatFaker = new FlinkInternalDataFakers.FloatFaker("float");
        fakers.add(floatFaker);
        FlinkInternalDataFakers.DoubleFaker doubleFaker = new FlinkInternalDataFakers.DoubleFaker("double");
        fakers.add(doubleFaker);
        FlinkInternalDataFakers.DateFaker dateFaker = new FlinkInternalDataFakers.DateFaker("date");
        fakers.add(dateFaker);
        FlinkInternalDataFakers.TimeFaker time0Faker = new FlinkInternalDataFakers.TimeFaker("time0",0);
        fakers.add(time0Faker);
        FlinkInternalDataFakers.TimeFaker time3Faker = new FlinkInternalDataFakers.TimeFaker("time3",3);
        fakers.add(time3Faker);
        FlinkInternalDataFakers.TimestampFaker timestamp0Faker = new FlinkInternalDataFakers.TimestampFaker("timestamp0",0);
        fakers.add(timestamp0Faker);
        FlinkInternalDataFakers.TimestampFaker timestamp3Faker = new FlinkInternalDataFakers.TimestampFaker("timestamp3",3);
        fakers.add(timestamp3Faker);
        FlinkInternalDataFakers.TimestampFaker timestamp6Faker = new FlinkInternalDataFakers.TimestampFaker("timestamp6", 6);
        fakers.add(timestamp6Faker);
        FlinkInternalDataFakers.BinaryFaker binary5Faker = new FlinkInternalDataFakers.BinaryFaker("binary5",5);
        fakers.add(binary5Faker);
        FlinkInternalDataFakers.VarBinaryFaker varBinary5Faker = new FlinkInternalDataFakers.VarBinaryFaker("varbinary5", 5);
        fakers.add(varBinary5Faker);
        FlinkInternalDataFakers.BytesFaker bytesFaker = new FlinkInternalDataFakers.BytesFaker("bytes");

        fakers.add(bytesFaker);
        rowDataType = DataTypes.ROW(fakers.stream().map(f->DataTypes.FIELD(f.getName(),f.getProducedDataType())).toArray(DataTypes.Field[]::new));
        typeFakerArr = fakers.toArray(new FlinkInternalDataFakers.FLinkInternalDataFaker<?>[0]);
    }

    public DataType getRowDataType() {
        return rowDataType;
    }

    public void printFLinkInternalType(){
        System.out.println("------------------------------------------------------");
        for (int i = 0; i < typeFakerArr.length; i++) {
            String fieldName = typeFakerArr[i].getName();
            DataType dataType = typeFakerArr[i].getProducedDataType();
            // 因为typeFakerArr已经将所有的类型BridgeTo Flink内不类型了。这里再次 toInternalDataType 意在告知Flink Table API Internal Type的来源。
            // DataType internalDataType = DataTypeUtils.toInternalDataType(dataType);
            System.out.printf("FieldName: %s --> TypeName: %s --> DefaultConversionClass: %s --> TypeConversionClass: %s%n"
                    ,fieldName
                    ,dataType.toString()
                    ,dataType.getLogicalType().getDefaultConversion().getSimpleName()
                    ,dataType.getConversionClass().getSimpleName());
        }
     System.out.println("------------------------------------------------------");
    }

    @Override
    public void run(SourceContext<RowData> sourceContext) throws Exception {
        Random random = new Random();
        while (true) {
            GenericRowData rowData = new GenericRowData(ROW_KINDS[random.nextInt(ROW_KINDS.length)], typeFakerArr.length);
            for (int i = 0; i < typeFakerArr.length; i++) {
                rowData.setField(i, typeFakerArr[i].get());
            }
            sourceContext.collect(rowData);
            Thread.sleep(interval * 1000L);
        }
    }

    @Override
    public void cancel() {

    }

    public static void main(String[] args) throws Exception {

        // FlinkEnvProvider provider = new FlinkEnvProvider();
        // StreamExecutionEnvironment senv = provider.getSenv();
        // StreamTableEnvironment tenv = provider.getTenv();
        StreamExecutionEnvironment senv = StreamExecutionEnvironment.getExecutionEnvironment();
        StreamTableEnvironment tenv = StreamTableEnvironment.create(senv);
        FlinkFakeTypeSourceFunc fakeSourceFunc = new FlinkFakeTypeSourceFunc(3);
        fakeSourceFunc.printFLinkInternalType();
        DataType dataType = fakeSourceFunc.getRowDataType();
        InternalTypeInfo<RowData> typeInfo = InternalTypeInfo.of((RowType) dataType.getLogicalType());

        DataStreamSource<RowData> rowDataDs = senv.addSource(fakeSourceFunc, "flinkTypeFakeSource", typeInfo);
        // rowDataDs.print();

        RowUtils.TypedMapFunc<RowData, Row> mapFunc = RowUtils.getRowDataToRowMapFunc(dataType);
        SingleOutputStreamOperator<Row> rowDs = rowDataDs.map(mapFunc).returns(mapFunc.getProducedType());
        DataType producedDataType = mapFunc.getProducedDataType();
        Schema schema = Schema.newBuilder().fromRowDataType(producedDataType).build();
        Table tbl = tenv.fromChangelogStream(rowDs, schema);
        DataType dt = tbl.getResolvedSchema().toPhysicalRowDataType();
        tbl.execute().print();
        senv.execute();
    }
}

三、LoglicalType默认承载类型和Fink Table 内部类型比较

printFLinkInternalType 方法将数据类型打印出来。

注意有些DataType没有使用LogicalType的DefaultConversionClass。

bash 复制代码

FieldName: char10 --> TypeName: CHAR(10) --> DefaultConversionClass: String --> TypeConversionClass: StringData
FieldName: varchar10 --> TypeName: VARCHAR(10) --> DefaultConversionClass: String --> TypeConversionClass: StringData
FieldName: string --> TypeName: STRING --> DefaultConversionClass: String --> TypeConversionClass: StringData
FieldName: boolean --> TypeName: BOOLEAN --> DefaultConversionClass: Boolean --> TypeConversionClass: Boolean
FieldName: decimal103 --> TypeName: DECIMAL(10, 3) --> DefaultConversionClass: BigDecimal --> TypeConversionClass: DecimalData
FieldName: tinyint --> TypeName: TINYINT --> DefaultConversionClass: Byte --> TypeConversionClass: Byte
FieldName: smallint --> TypeName: SMALLINT --> DefaultConversionClass: Short --> TypeConversionClass: Short
FieldName: integer --> TypeName: INT --> DefaultConversionClass: Integer --> TypeConversionClass: Integer
FieldName: bigint --> TypeName: BIGINT --> DefaultConversionClass: Long --> TypeConversionClass: Long
FieldName: float --> TypeName: FLOAT --> DefaultConversionClass: Float --> TypeConversionClass: Float
FieldName: double --> TypeName: DOUBLE --> DefaultConversionClass: Double --> TypeConversionClass: Double
FieldName: date --> TypeName: DATE --> DefaultConversionClass: LocalDate --> TypeConversionClass: Integer
FieldName: time0 --> TypeName: TIME(0) --> DefaultConversionClass: LocalTime --> TypeConversionClass: Integer
FieldName: time3 --> TypeName: TIME(3) --> DefaultConversionClass: LocalTime --> TypeConversionClass: Integer
FieldName: timestamp0 --> TypeName: TIMESTAMP(0) --> DefaultConversionClass: LocalDateTime --> TypeConversionClass: TimestampData
FieldName: timestamp3 --> TypeName: TIMESTAMP(3) --> DefaultConversionClass: LocalDateTime --> TypeConversionClass: TimestampData
FieldName: timestamp6 --> TypeName: TIMESTAMP(6) --> DefaultConversionClass: LocalDateTime --> TypeConversionClass: TimestampData
FieldName: binary5 --> TypeName: BINARY(5) --> DefaultConversionClass: byte[] --> TypeConversionClass: byte[]
FieldName: varbinary5 --> TypeName: VARBINARY(5) --> DefaultConversionClass: byte[] --> TypeConversionClass: byte[]
FieldName: bytes --> TypeName: BYTES --> DefaultConversionClass: byte[] --> TypeConversionClass: byte[]

四、样例数据

+----+--------------------------------+--------------------------------+--------------------------------+---------+--------------+---------+----------+-------------+----------------------+--------------------------------+--------------------------------+------------+----------+--------------+---------------------+-------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+
| op |                         char10 |                      varchar10 |                         string | boolean |   decimal103 | tinyint | smallint |     integer |               bigint |                          float |                         double |       date |    time0 |        time3 |          timestamp0 |              timestamp3 |                 timestamp6 |                        binary5 |                     varbinary5 |                          bytes |
+----+--------------------------------+--------------------------------+--------------------------------+---------+--------------+---------+----------+-------------+----------------------+--------------------------------+--------------------------------+------------+----------+--------------+---------------------+-------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+
| -D |                         林远航 |                         吕建辉 |  莫炫明|中山|擎宇.魏@yahoo.com |   false |  3050752.529 |     113 |    -9916 |  -642000144 |  4156969259139129690 |                      1673004.6 |              5.866031031768757 | 1988-07-13 | 19:17:05 |     05:02:40 | 2017-02-24 08:49:28 | 1980-03-02 11:28:27.601 | 2007-10-24 19:41:31.074622 |    [-26, -78, -120, -25, -125] |     [-24, -75, -75, -26, -103] | [-24, -82, -72, -26, -104, ... |
| -D |                         沈伟祺 |                         段浩然 | 阎擎宇|阳江|越彬.范@hotmail... |    true |  1353447.631 |      84 |     3766 | -1944128024 |  5163149151613555000 |                      294841.06 |              404.7775779582528 | 2038-11-15 | 22:25:22 |     12:45:26 | 2055-04-12 12:48:41 | 2012-07-20 19:19:59.805 | 1989-05-24 16:32:30.562509 |    [-24, -117, -113, -27, -83] |    [-25, -122, -118, -23, -72] | [-26, -101, -66, -23, -71, ... |
| +I |                         谭弘文 |                         丁弘文 |  苏睿渊|韶关|擎苍.陈@yahoo.com |   false |  8423218.732 |       9 |    10515 |   524074331 | -2197205037599287672 |                      27.323235 |              9053.888002920687 | 2066-11-04 | 12:05:57 |     03:09:11 | 1978-11-22 23:30:41 | 1975-07-05 12:16:57.301 | 2001-10-28 06:15:39.835157 |    [-23, -126, -79, -25, -125] |    [-25, -88, -117, -27, -121] | [-28, -67, -107, -27, -83, ... |