如何在 ORACLE 中一次性删除所有表及其约束 - TypeScript

在开发过程中，有时需要一次性删除所有表及其约束，本文将介绍如何使用 TypeScript 在 ORACLE 中实现此功能。

实现步骤

1. 安装 oracledb 库

   npm install oracledb
   

2. 连接 ORACLE 数据库

   import oracledb from 'oracledb';
   
   const connection = await oracledb.getConnection({
     user: 'username',
     password: 'password',
     connectString: 'hostname:port/servicename'
   });
   

3. 查询所有表名及其约束名

   const result = await connection.execute(`
     SELECT c.table_name, c.constraint_name
     FROM user_constraints c
     WHERE c.constraint_type = 'R' 
       AND c.status = 'ENABLED'
   `);
   const constraints = result.rows;
   

4. 删除所有表及其约束

   for (const c of constraints) {
     await connection.execute(`ALTER TABLE ${c[0]} DROP CONSTRAINT ${c[1]}`);
   }
   await connection.execute('PURGE RECYCLEBIN');
   const result = await connection.execute('SELECT table_name FROM user_tables');
   for (const table of result.rows) {
     await connection.execute(`DROP TABLE ${table[0]} CASCADE CONSTRAINTS PURGE`);
   }
   

完整代码

import oracledb from 'oracledb';

async function deleteAllTables(): Promise<void> {
  const connection = await oracledb.getConnection({
    user: 'username',
    password: 'password',
    connectString: 'hostname:port/servicename'
  });

  const result = await connection.execute(`
    SELECT c.table_name, c.constraint_name
    FROM user_constraints c
    WHERE c.constraint_type = 'R' 
      AND c.status = 'ENABLED'
  `);
  const constraints = result.rows;

  for (const c of constraints) {
    await connection.execute(`ALTER TABLE ${c[0]} DROP CONSTRAINT ${c[1]}`);
  }
  await connection.execute('PURGE RECYCLEBIN');
  const result = await connection.execute('SELECT table_name FROM user_tables');
  for (const table of result.rows) {
    await connection.execute(`DROP TABLE ${table[0]} CASCADE CONSTRAINTS PURGE`);
  }

  await connection.close();
}

deleteAllTables().then(() => {
  console.log('All tables deleted successfully.');
}).catch((err) => {
  console.error(err);
});

在调用 deleteAllTables 函数时，会删除所有表及其约束。可以根据实际需要修改连接信息及其他相关参数。

以上就是在 ORACLE 中一次性删除所有表及其约束的实现方法，希望对大家有所帮助。