生成sql脚本

Question

是否有任何hibernate utitliy,我可以用来连接到数据库.列出所有表,并为"创建表+数据"生成sql脚本并保存为*.sql？

Answer 1

将数据从数据库导出为sql

使用liquibase opensource项目

LiquiBase是一个开源(LGPL),独立于数据库的库,用于跟踪,管理和应用数据库更改.它建立在一个简单的前提上:所有数据库更改(结构和数据)都以基于XML的描述方式存储,并检入源代码控制.

为给定的JPA实体生成创建和删除脚本

我们使用此代码生成drop和create语句:只需使用所有实体类构造此类并调用create/dropTableScript.

如果需要,您可以使用persitence.xml和persitance单元名称.只是说点什么,我也发布了代码.

import java.util.Collection;
import java.util.Properties;

import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.dialect.Dialect;
import org.hibernate.ejb.Ejb3Configuration;

/**
 * SQL Creator for Tables according to JPA/Hibernate annotations.
 *
 * Use:
 *
 * {@link #createTablesScript()} To create the table creationg script
 *
 * {@link #dropTablesScript()} to create the table destruction script
 * 
 */
public class SqlTableCreator {

    private final AnnotationConfiguration hibernateConfiguration;
    private final Properties dialectProps;

    public SqlTableCreator(final Collection<Class<?>> entities) {

        final Ejb3Configuration ejb3Configuration = new Ejb3Configuration();
        for (final Class<?> entity : entities) {
            ejb3Configuration.addAnnotatedClass(entity);
        }

        dialectProps = new Properties();
        dialectProps.put("hibernate.dialect", "org.hibernate.dialect.SQLServerDialect");

        hibernateConfiguration = ejb3Configuration.getHibernateConfiguration();
    }

    /**
     * Create the SQL script to create all tables.
     * 
     * @return A {@link String} representing the SQL script.
     */
    public String createTablesScript() {
        final StringBuilder script = new StringBuilder();

        final String[] creationScript = hibernateConfiguration.generateSchemaCreationScript(Dialect
                .getDialect(dialectProps));
        for (final String string : creationScript) {
            script.append(string).append(";\n");
        }
        script.append("\ngo\n\n");

        return script.toString();
    }

    /**
     * Create the SQL script to drop all tables.
     * 
     * @return A {@link String} representing the SQL script.
     */
    public String dropTablesScript() {
        final StringBuilder script = new StringBuilder();

        final String[] creationScript = hibernateConfiguration.generateDropSchemaScript(Dialect
                .getDialect(dialectProps));
        for (final String string : creationScript) {
            script.append(string).append(";\n");
        }
        script.append("\ngo\n\n");

        return script.toString();
    }
}