PostgreSql JDBC事务操作方法详解

Connection.setAutoCommit(false);

Connection.commit();

Connection.rollback();

import lombok.Data;
@Data
public class ProRank {
    Integer id;
    String name;
    String team;
    String line;
    Integer rank;
}

import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;
import java.sql.*;
@SpringBootTest
class JdbcTrasationTests {
    private final String url = "jdbc:p6spy:postgresql://localhost:5432/postgres";
    private final String user = "postgres";
    private final String password = "112233";
    /**
     * 连接PostgreSql数据库
     *
     * @return Connection
     * @throws SQLException
     */
    public Connection connect() throws SQLException {
        return DriverManager.getConnection(url, user, password);
    }
    @Test
    void testTrasation() {
        ProRank proRank = new ProRank();
        proRank.setLine("Mid");
        proRank.setName("Faker");
        proRank.setTeam("T1");
        proRank.setRank(0);
        //调用
        addProAndUpdateRank(proRank,2222);
    }
    /**
     * 关闭一个AutoCloseable对象
     *
     * @param closeable
     */
    private void close(AutoCloseable closeable) {
        try {
            if (closeable != null) {
                closeable.close();
            }
        } catch (Exception e) {
            System.out.println(e.getMessage());
        }
    }
    /**
     * 插入一条选手记录，更新他的rank值
     *
     * @param proRank
     * @param rank
     */
    public void addProAndUpdateRank(ProRank proRank, Integer rank) {
        Connection conn = null;
        PreparedStatement pstmt = null;
        PreparedStatement pstmt2 = null;
        ResultSet rs = null;
        // 插入一条数据
        String SQL = "INSERT INTO pro_rank(name,team,line,rank) VALUES(?,?,?,?)";
        // 更新他的rank值
        String SQLUpdateRank = "UPDATE pro_rank SET rank = ? WHERE id = ?;";
        int id = 0;
        try {
            // 链接数据库
            conn = connect();
            conn.setAutoCommit(false);
            // 插入一条数据
            pstmt = conn.prepareStatement(SQL, Statement.RETURN_GENERATED_KEYS);
            pstmt.setString(1, proRank.getName());
            pstmt.setString(2, proRank.getTeam());
            pstmt.setString(3, proRank.getLine());
            pstmt.setInt(4, proRank.getRank());
            int affectedRows = pstmt.executeUpdate();
            // 判断是否生效
            if (affectedRows > 0) {
                // 获取返回的id
                rs = pstmt.getGeneratedKeys();
                if (rs.next()) {
                    id = rs.getInt(1);
                    if (id > 0) {
                        pstmt2 = conn.prepareStatement(SQLUpdateRank);
                        pstmt2.setInt(2, id);
                        pstmt2.setInt(1, rank);
                        pstmt2.executeUpdate();
                    }
                }
            } else {
                // 如果新增数据失败，回滚
                conn.rollback();
            }
            // 提交事务
            conn.commit();
            System.out.println("插入选手数据成功！更新选手rank成功，数据id：" + id);
        } catch (SQLException sqlException) {
            System.out.println(sqlException.getMessage());
            sqlException.printStackTrace();
            // 回滚事务
            System.out.println("回滚事务...");
            try {
                if (conn != null) {
                    conn.rollback();
                }
            } catch (SQLException e) {
                System.out.println(e.getMessage());
                e.printStackTrace();
            }
        } finally {
            close(rs);close(pstmt);close(pstmt2);close(conn);
        }
    }
}

SELECT * FROM "public"."pro_rank" LIMIT 1000 OFFSET 0;