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Carry out annotation definition and constant definition of Hibernate

Annotation definition

Simulate Hibernate directly to define several of the most common annotations.

@Entity

package com.ryo.hibernate.simulator.hibernate.annotations;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * Entity - Comment
 * Created by houbinbin on 16/6/5.
 */
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
@Documented
public @interface Entity {
    /**
     * Table name
     * @return Table name
     */
    String value() default "";
}

@Column

package com.ryo.hibernate.simulator.hibernate.annotations;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * Column annotation
 * Created by houbinbin on 16/6/5.
 */
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
@Documented
public @interface Column {

    /**
     * Column names
     * @return Column names
     */
    String value() default "";

    /**
     * Can it be empty
     * @return {@code true} Sure
     */
    boolean nullable() default true;

    /**
     * Length of field
     * @return Length of field
     */
    int length() default 255;

}

@Id

package com.ryo.hibernate.simulator.hibernate.annotations;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * Primary key identifier
 * Created by houbinbin on 16/6/5.
 */
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD})
@Documented
public @interface Id {
}

@GenerateValue

package com.ryo.hibernate.simulator.hibernate.annotations;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * Self growing values - Comments
 * Created by houbinbin on 16/6/5.
 */
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
@Documented
public @interface GenerateValue {
}

Constant definition

It is convenient for later programming development, global definition, and unified modification and maintenance.

HibernateConstant.java

For entity column generation

package com.ryo.hibernate.simulator.hibernate.constants;

/**
 *
 * hibernate constant
 * @author houbinbin
 * @date 16/6/5
 */
public class HibernateConstant {

    /**
     * Default string size {@ value}
     */
    public static final int DEFAULT_STRING_SIZE = 255;

}

TypeMap.java

For bean and database column field type mapping

package com.ryo.hibernate.simulator.hibernate.constants;

import java.util.HashMap;
import java.util.Map;

/**
 * Storage type map
 * Created by houbinbin on 16/6/5.
 * @author houbinbin
 */
public class TypeMap {

    private static final Map<String, String> TYPE_MAP = new HashMap<>();

    static {
        TYPE_MAP.put("java.lang.String", "VARCHAR");
        TYPE_MAP.put("char", "CHAR");
        TYPE_MAP.put("java.lang.Character", "CHAR");
        TYPE_MAP.put("boolean", "BIT");
        TYPE_MAP.put("java.lang.Boolean", "BIT");
        TYPE_MAP.put("byte", "TINYINT");
        TYPE_MAP.put("short", "SMALLINT");
        TYPE_MAP.put("java.lang.Byte", "SMALLINT");
        TYPE_MAP.put("int", "INTEGER");
        TYPE_MAP.put("java.lang.Integer", "INTEGER");
        TYPE_MAP.put("long", "BIGINT");
        TYPE_MAP.put("java.lang.Long", "BIGINT");
        TYPE_MAP.put("float", "FLOAT");
        TYPE_MAP.put("java.lang.Float", "FLOAT");
        TYPE_MAP.put("double", "DOUBLE");
        TYPE_MAP.put("java.lang.Double", "DOUBLE");
        TYPE_MAP.put("java.util.Date", "DATETIME");
    }

    /**
     * Get map list
     * @return map
     */
    public static Map<String, String> getTypeMap() {
        return TYPE_MAP;
    }
}

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