Springboot手动连接库并获取指定表结构的示例代码

    /**
     * 获取指定表的字段集合
     */
    @PostMapping("/get-db-columns")
    @ApiOperation(value = "获取指定表的字段集合",notes = "获取指定表的字段集合")
    public ResultResponse<List<String>> getDbColumns(@RequestBody FindDbColumnModel model){
        return new ResultResponse<>(dbService.getDbColumns(model));
    }

package com.example.demo.model;
import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import lombok.Data;
/**
 * @author luoYong
 * @version 1.0
 * @date 2022/8/30 16:02
 */
@Data
@ApiModel(value = "获取指定表的字段集合", description = "获取指定表的字段集合")
public class FindDbColumnModel {
    @ApiModelProperty(value = "数据库url")
    private String dbUrl;
    @ApiModelProperty(value = "数据库连接用户名")
    private String userName;
    @ApiModelProperty(value = "数据库连接密码")
    private String passWord;
    @ApiModelProperty(value = "数据库驱动")
    private String driverClass;
    @ApiModelProperty(value = "指定查询表名")
    private String tableName;
}

    /**
     * 获取指定表的字段集合
     */
    List<String> getDbColumns(FindDbColumnModel model);

    /**     * 获取指定表的字段集合     */    &#64;Override    public List<String> getDbColumns(FindDbColumnModel model) {        //与数据库取的连接        Connection conn &#61; this.getConn(model.getDbUrl(), model.getUserName(), model.getPassWord(), model.getDriverClass());        //拼接分页sql(以mysql为例)        String sql &#61; &#34;select * from &#34; &#43; model.getTableName();        //申明PreparedStatement        PreparedStatement pst &#61; null;        try {            //执行SQL语句            pst &#61; conn.prepareStatement(sql);            ResultSet rs &#61; pst.executeQuery(sql);            ResultSetMetaData metaData &#61; rs.getMetaData();            //定义一个存放所有列名的集合            List<String> columnArr &#61; new ArrayList<>();            //获取表字段名            for (int i &#61; 1; i <&#61; metaData.getColumnCount(); i&#43;&#43;) {                //循环获取&#xff0c;再储存到集合中。                String columnName &#61; metaData.getColumnName(i);                columnArr.add(columnName);            }            return columnArr;        } catch (SQLException e) {            e.printStackTrace();        }        return new ArrayList<>();    }    /**
     * 获取指定表的字段集合
     */
    @Override
    public List<String> getDbColumns(FindDbColumnModel model) {
        //与数据库取的连接
        Connection conn = this.getConn(model.getDbUrl(), model.getUserName(), model.getPassWord(), model.getDriverClass());
        //拼接分页sql(以mysql为例)
        String sql = "select * from " + model.getTableName();
        //申明PreparedStatement
        PreparedStatement pst = null;
        try {
            //执行SQL语句
            pst = conn.prepareStatement(sql);
            ResultSet rs = pst.executeQuery(sql);
            ResultSetMetaData metaData = rs.getMetaData();
            //定义一个存放所有列名的集合
            List<String> columnArr = new ArrayList<>();
            //获取表字段名
            for (int i = 1; i <= metaData.getColumnCount(); i++) {
                //循环获取，再储存到集合中。
                String columnName = metaData.getColumnName(i);
                columnArr.add(columnName);
            }
            return columnArr;
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return new ArrayList<>();
    }

    /**
     * 手动连接数据库
     *
     * @param url
     * @param userName
     * @param passWord
     * @param driverClass
     */
    public Connection getConn(String url, String userName, String passWord, String driverClass) {
        //声明数据库连接对象
        Connection conn = null;
        try {
            //加载驱动
            Class.forName(driverClass);
            //初始化数据库连接,获取连接对象
            conn = DriverManager.getConnection(url, userName, passWord);
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("获得数据库连接出错");
        }
        return conn;
    }

{
	"dbUrl": "jdbc:mysql://127.0.0.1:3306/springboot_db?serverTimezone=GMT%2B8",
	"userName": "root",
	"passWord": "123456",
	"driverClass": "com.mysql.cj.jdbc.Driver",
	"tableName": "grade"
}