Create meta entity.

src/main/java/run/halo/app/model/entity/BaseMeta.java

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+package run.halo.app.model.entity;
+
+
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.ToString;
+
+import javax.persistence.*;
+
+/**
+ * Base meta entity.
+ *
+ * @author ryanwang
+ * @author ikaisec
+ * @date 2019-08-04
+ */
+@Data
+@Entity(name = "BaseMeta")
+@Table(name = "metas")
+@DiscriminatorColumn(name = "type", discriminatorType = DiscriminatorType.INTEGER, columnDefinition = "int default 0")
+@ToString(callSuper = true)
+@EqualsAndHashCode(callSuper = true)
+public class BaseMeta extends BaseEntity {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    /**
+     * Post id.
+     */
+    @Column(name = "post_id", columnDefinition = "int not null")
+    private Integer postId;
+
+    /**
+     * meta key
+     */
+    @Column(name = "meta_key", columnDefinition = "varchar(100) not null")
+    private String key;
+
+    /**
+     * meta value
+     */
+    @Column(name = "meta_value", columnDefinition = "varchar(1023) not null")
+    private String value;
+}

src/main/java/run/halo/app/model/entity/PostMeta.java

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+package run.halo.app.model.entity;
+
+import javax.persistence.DiscriminatorValue;
+import javax.persistence.Entity;
+
+/**
+ * PostMeta entity.
+ *
+ * @author ryanwang
+ * @author ikaisec
+ * @date 2019-08-04
+ */
+@Entity(name = "PostMeta")
+@DiscriminatorValue("0")
+public class PostMeta extends BaseMeta {
+}

src/main/java/run/halo/app/model/entity/SheetMeta.java

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+package run.halo.app.model.entity;
+
+import javax.persistence.DiscriminatorValue;
+import javax.persistence.Entity;
+
+/**
+ * SheetMeta entity.
+ *
+ * @author ryanwang
+ * @author ikaisec
+ * @date 2019-08-04
+ */
+@Entity(name = "SheetMeta")
+@DiscriminatorValue("0")
+public class SheetMeta extends BaseMeta {
+}