java实现mysql数据库表迁移代码

实现 mysql 数据库表迁移的代码可以使用 Java 的 JDBC API 来进行操作。下面是一个简单的示例代码：

import java.sql.*;

public class TableMigration {
    public static void main(String[] args) {
        Connection sourceConn = null;
        Connection targetConn = null;
        try {
            // 配置源数据库连接
            sourceConn = DriverManager.getConnection("jdbc:mysql://localhost:3306/source_db?useSSL=false", "root", "password");

            // 配置目标数据库连接
            targetConn = DriverManager.getConnection("jdbc:mysql://localhost:3306/target_db?useSSL=false", "root", "password");

            // 获取源数据库表列表
            ResultSet rs = sourceConn.getMetaData().getTables(null, null, "%", new String[]{"TABLE"});
            while (rs.next()) {
                String tableName = rs.getString("TABLE_NAME");
                System.out.println("Migrating table " + tableName + "...");
                migrateTable(sourceConn, targetConn, tableName);
            }
            System.out.println("All tables migrated successfully!");
        } catch (SQLException ex) {
            ex.printStackTrace();
        } finally {
            // 关闭数据库连接
            if (sourceConn != null) {
                try {
                    sourceConn.close();
                } catch (SQLException ex) {
                    ex.printStackTrace();
                }
            }
            if (targetConn != null) {
                try {
                    targetConn.close();
                } catch (SQLException ex) {
                    ex.printStackTrace();
                }
            }
        }
    }

    private static void migrateTable(Connection sourceConn, Connection targetConn, String tableName) {
        try {
            // 查询源数据库表的数据
            Statement sourceStmt = sourceConn.createStatement();
            ResultSet sourceRs = sourceStmt.executeQuery("SELECT * FROM " + tableName);

            // 获取源数据库表的列信息
            ResultSetMetaData sourceMeta = sourceRs.getMetaData();
            int columnCount = sourceMeta.getColumnCount();
            StringBuilder columns = new StringBuilder();
            for (int i = 1; i <= columnCount; i++) {
                String columnName = sourceMeta.getColumnName(i);
                String columnType = sourceMeta.getColumnTypeName(i);
                columns.append(columnName).append(" ").append(columnType).append(",");
            }
            columns.deleteCharAt(columns.length() - 1);

            // 在目标数据库中创建表
            Statement targetStmt = targetConn.createStatement();
            targetStmt.execute("CREATE TABLE " + tableName + " (" + columns + ")");

            // 循环插入数据到目标数据库表中
            while (sourceRs.next()) {
                StringBuilder values = new StringBuilder();
                for (int i = 1; i <= columnCount; i++) {
                    String value = sourceRs.getString(i);
                    values.append("'").append(value).append("',");
                }
                values.deleteCharAt(values.length() - 1);
                targetStmt.executeUpdate("INSERT INTO " + tableName + " VALUES (" + values + ")");
            }

            // 关闭资源
            sourceRs.close();
            sourceStmt.close();
            targetStmt.close();
        } catch (SQLException ex) {
            ex.printStackTrace();
        }
    }
}

注：以上代码仅供参考，具体需要根据不同的数据库结构进行调整。