How to query all tables and all data in oracle database

To query all Oracle tables, execute: SELECT table_name FROM user_tables;. To query all data, you need to: 1. Get the table name; 2. Traverse the table and query: SELECT * FROM table_name;.

How to query all tables and data in Oracle database

Query all tables

To query all tables in the Oracle database, you can use the following SQL statement:

<code class="sql">SELECT table_name
FROM user_tables;</code>

This query will return the names of all tables in the current user mode.

Query all data

To query all data in the Oracle database, you can perform the following steps:

1. Get all tables Names: Use the above query to get the names of all tables.
2. Loop through the tables and query the data: Use FOR to loop through the list of table names and execute the following statement on each table to query the data:

<code class="sql">SELECT * FROM table_name;</code>

Where table_name is the name of the table in the current loop.

Sample Code

The following sample code demonstrates how to query all tables and data using the above method:

<code class="python">import cx_Oracle

# 连接到数据库
connection = cx_Oracle.connect('username', 'password', 'dsn')

# 获取游标
cursor = connection.cursor()

# 查询所有表
cursor.execute('SELECT table_name FROM user_tables')

# 获取表名
table_names = [row[0] for row in cursor.fetchall()]

# 遍历表并查询数据
for table_name in table_names:
    cursor.execute('SELECT * FROM ' + table_name)
    print(cursor.fetchall())

# 关闭游标和连接
cursor.close()
connection.close()</code>

The above is the detailed content of How to query all tables and all data in oracle database. For more information, please follow other related articles on the PHP Chinese website!