mybatis动态增删改查

      原来使用sql时也都只是DML（Data Manipulation Language 数据操控语言）的，对于DDL（Data Definition Language 数据定义语言）的操作比较少涉及，最近项目中恰巧需要进行DDL操作，进行简单的记录。项目需求，根据前台传来的表名，字段，数据，进行动态的创建表格，实现对表格的增删改查操作。

    首先创建一个实体类，用来封装操作表的数据。

/**
 * 
 * @Description :动态操作表变量
 * @author Bush罗
 * @date 2018年7月19日
 *
 */
public class OperateTable {
	//表名
	private String tableName;
	//用于添加字段使用
	private String wordSegment;
	//用于创建数据库时使用，存放所有需要的字段
	private List listWord;
	//字段所表示的中文意思，需要从前台传过来
	private List listWordMean;
	//用于删除数据使用的id
	private Integer id;
	//表示一行数据，用户填写的一行数据
	private List listData;
	//返回该数据库的所有表明
	private List listTableName;
	//存放字段和数据
	private Map mapWordData;

dao层接口

public interface OperateTableService {
	// 创建表
	void createTable(OperateTable operateTable);

	// 插入数据
	void insertTable(OperateTable operateTable);

	// 查找所有表名
	List findAllTableName();

	// 更新数据库
	void updateTable(@Param("content") Map mapWordData);

	// 更新数据库
	void updateTable1(OperateTable operateTable);

	// 动态删除数据
	void deleteById(OperateTable operateTable);

	// 动态为表添加字段
	void addColumn(OperateTable operateTable);
}

最重要的动态sql语句，也是mybatis最大的优点，灵活

	
	
	
	
	
		create table ${tableName} (
		id int(100) NOT NULL PRIMARY KEY
		AUTO_INCREMENT,
		
			${word}
			varchar(255)
		
		) ENGINE=InnoDB DEFAULT CHARSET=utf8
	
	
		
		
			SELECT
			LAST_INSERT_ID()
		
		insert into
		${tableName}
		
			
				${key}
			
		
		
			
				#{value}
			
		
	
	
	
		select
		table_name
		FROM
		information_schema.tables
		WHERE table_schema = 'market'
		AND table_type =
		'base table'
		AND TABLE_NAME LIKE "office_%"
	
	
	
		update office_1 SET
		
			${key} = #{content[${key}]}
		
		where id = 1
	
	
	
		update ${tableName}
		
			
				${key}=#{value}
			
		
		where id = #{id}
	
	
	
		delete from ${tableName}
		where id = #{id}
	
	
	
		alter table ${tableName} add column ${wordSegment} varchar(255);
	

Controller测试用例

/**
 * 
 * @Description :动态操作数据库案例
 * @author Bush罗
 * @date 2018年7月20日
 *
 */
@Controller
public class OperateTableController {
	
	@Autowired
	private OperateTableService operateTableService;

	@ResponseBody
	@RequestMapping("/creat")
	public String creat() {
		System.out.println("创建");
		OperateTable operateTable = new OperateTable();
		operateTable.setTableName("office_1");
		List list = new LinkedList();
		list.add("of_1");
		list.add("of_2");
		list.add("of_3");
		operateTable.setListWord(list);
		operateTableService.createTable(operateTable);
		return "创建成功";
	}
	@ResponseBody
	@RequestMapping("/insertTable")
	public String insertTable() {
		System.out.println("插入");
		OperateTable operateTable = new OperateTable();
		operateTable.setTableName("office_1");
		Map mapWordData=new HashMap();
		mapWordData.put("username", "小红");
		mapWordData.put("sex", "男");
		mapWordData.put("phonenumber", "123456789");
		mapWordData.put("teacherid", "500");
		operateTable.setMapWordData(mapWordData);
		operateTableService.insertTable(operateTable);
		return "success";
	}
	
	@ResponseBody
	@RequestMapping("/updateTable")
	public String updateTable() {
		System.out.println("更新");
		OperateTable operateTable = new OperateTable();
		operateTable.setTableName("office_1");
		Map mapWordData=new HashMap();
		mapWordData.put("of_1", "小红");
		mapWordData.put("of_2", "明");
		mapWordData.put("of_3", "500");
		operateTable.setMapWordData(mapWordData);
		System.out.println(operateTable.toString());
		operateTableService.updateTable(mapWordData);
		return "更新成功";
	}
	@ResponseBody
	@RequestMapping("/updateTable1")
	public String updateTable1() {
		System.out.println("更新1");
		OperateTable operateTable = new OperateTable();
		operateTable.setTableName("office_1");
		Map mapWordData=new HashMap();
		mapWordData.put("of_1", "6红");
		mapWordData.put("of_2", null);
		mapWordData.put("of_3", "小芳");
		operateTable.setMapWordData(mapWordData);
		operateTable.setId(3);
		operateTableService.updateTable1(operateTable);
		return "更新成功1";
	}
	@ResponseBody
	@RequestMapping("delete")
	public String delete(){
		System.out.println("删除");
		OperateTable operateTable = new OperateTable();
		operateTable.setTableName("office_1");
		operateTable.setId(3);
		operateTableService.deleteById(operateTable);
		return "删除成功";
	}
	@ResponseBody
	@RequestMapping("addcolumn")
	public String addcolumn(){
		System.out.println("添加字段");
		OperateTable operateTable = new OperateTable();
		operateTable.setTableName("office_1");
		operateTable.setWordSegment("of_4");
		operateTableService.deleteById(operateTable);
		return "添加成功";
	}
	

}