cleaning up db
This commit is contained in:
329
backend/db/db-inspector/postgres-schema.js
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329
backend/db/db-inspector/postgres-schema.js
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// 检查数据库结构的脚本
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const { Client } = require('pg');
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const dotenv = require('dotenv');
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const path = require('path');
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const fs = require('fs');
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// 加载环境变量
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dotenv.config({ path: path.resolve(__dirname, '../../.env') });
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// 获取数据库连接字符串
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const databaseUrl = process.env.DATABASE_URL;
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if (!databaseUrl) {
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console.error('缺少数据库连接字符串。请确保.env文件中包含DATABASE_URL');
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process.exit(1);
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}
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// 定义输出目录
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const DB_REPORTS_DIR = path.resolve(__dirname, '../db-reports');
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// 连接数据库
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async function connect() {
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console.log('使用PostgreSQL连接字符串连接数据库...');
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// 创建PostgreSQL客户端
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const client = new Client({
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connectionString: databaseUrl,
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});
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try {
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await client.connect();
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console.log('成功连接到数据库');
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return client;
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} catch (error) {
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console.error('连接数据库失败:', error);
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throw error;
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}
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}
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// 断开数据库连接
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async function disconnect(client) {
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try {
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await client.end();
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console.log('已断开数据库连接');
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} catch (error) {
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console.error('断开数据库连接失败:', error);
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}
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}
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// 获取所有表
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async function getAllTables(client) {
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console.log('\n获取所有表...');
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try {
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const query = `
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SELECT table_name
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FROM information_schema.tables
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WHERE table_schema = 'public'
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ORDER BY table_name;
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`;
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const result = await client.query(query);
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if (!result.rows || result.rows.length === 0) {
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console.log('没有找到任何表');
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return null;
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}
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console.log('找到以下表:');
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result.rows.forEach(row => {
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console.log(` - ${row.table_name}`);
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});
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return result.rows.map(row => row.table_name);
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} catch (error) {
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console.error('获取所有表时出错:', error);
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return null;
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}
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}
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// 获取表结构
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async function getTableSchema(client, tableName) {
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console.log(`\n获取表 ${tableName} 的结构...`);
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try {
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// 获取基本列信息
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const columnsQuery = `
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SELECT
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column_name,
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data_type,
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is_nullable,
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column_default,
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character_maximum_length,
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numeric_precision,
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numeric_scale
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FROM
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information_schema.columns
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WHERE
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table_schema = 'public' AND
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table_name = $1
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ORDER BY
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ordinal_position;
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`;
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const columnsResult = await client.query(columnsQuery, [tableName]);
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if (!columnsResult.rows || columnsResult.rows.length === 0) {
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console.log(`表 ${tableName} 不存在或没有列`);
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return null;
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}
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// 获取主键信息
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const primaryKeyQuery = `
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SELECT
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kcu.column_name
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FROM
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information_schema.table_constraints tc
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JOIN information_schema.key_column_usage kcu
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ON tc.constraint_name = kcu.constraint_name
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AND tc.table_schema = kcu.table_schema
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WHERE
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tc.constraint_type = 'PRIMARY KEY' AND
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tc.table_schema = 'public' AND
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tc.table_name = $1
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ORDER BY
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kcu.ordinal_position;
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`;
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const primaryKeyResult = await client.query(primaryKeyQuery, [tableName]);
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// 获取外键信息
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const foreignKeysQuery = `
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SELECT
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kcu.column_name,
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ccu.table_name AS foreign_table_name,
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ccu.column_name AS foreign_column_name
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FROM
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information_schema.table_constraints tc
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JOIN information_schema.key_column_usage kcu
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ON tc.constraint_name = kcu.constraint_name
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AND tc.table_schema = kcu.table_schema
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JOIN information_schema.constraint_column_usage ccu
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ON tc.constraint_name = ccu.constraint_name
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AND tc.table_schema = ccu.table_schema
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WHERE
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tc.constraint_type = 'FOREIGN KEY' AND
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tc.table_schema = 'public' AND
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tc.table_name = $1;
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`;
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const foreignKeysResult = await client.query(foreignKeysQuery, [tableName]);
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// 获取索引信息
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const indexesQuery = `
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SELECT
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indexname,
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indexdef
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FROM
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pg_indexes
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WHERE
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schemaname = 'public' AND
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tablename = $1;
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`;
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const indexesResult = await client.query(indexesQuery, [tableName]);
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// 输出列信息
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console.log(`表 ${tableName} 的列:`);
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columnsResult.rows.forEach(column => {
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console.log(` - ${column.column_name} (${column.data_type}${
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column.character_maximum_length ? `(${column.character_maximum_length})` :
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(column.numeric_precision ? `(${column.numeric_precision},${column.numeric_scale})` : '')
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}, ${column.is_nullable === 'YES' ? '可为空' : '不可为空'}, 默认值: ${column.column_default || 'NULL'})`);
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});
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// 输出主键信息
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if (primaryKeyResult.rows.length > 0) {
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console.log(` 主键: ${primaryKeyResult.rows.map(row => row.column_name).join(', ')}`);
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} else {
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console.log(' 主键: 无');
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}
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// 输出外键信息
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if (foreignKeysResult.rows.length > 0) {
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console.log(' 外键:');
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foreignKeysResult.rows.forEach(fk => {
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console.log(` - ${fk.column_name} -> ${fk.foreign_table_name}.${fk.foreign_column_name}`);
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});
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} else {
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console.log(' 外键: 无');
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}
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// 输出索引信息
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if (indexesResult.rows.length > 0) {
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console.log(' 索引:');
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indexesResult.rows.forEach(idx => {
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console.log(` - ${idx.indexname}: ${idx.indexdef}`);
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});
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} else {
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console.log(' 索引: 无');
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}
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return {
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columns: columnsResult.rows,
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primaryKey: primaryKeyResult.rows,
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foreignKeys: foreignKeysResult.rows,
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indexes: indexesResult.rows
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};
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} catch (error) {
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console.error(`获取表 ${tableName} 结构时出错:`, error);
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return null;
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}
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}
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// 获取表数据示例
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async function getTableDataSample(client, tableName, limit = 5) {
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console.log(`\n获取表 ${tableName} 的数据示例 (最多 ${limit} 行)...`);
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try {
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const query = `
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SELECT *
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FROM "${tableName}"
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LIMIT $1;
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`;
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const result = await client.query(query, [limit]);
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if (!result.rows || result.rows.length === 0) {
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console.log(`表 ${tableName} 中没有数据`);
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return null;
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}
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console.log(`表 ${tableName} 的数据示例:`);
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result.rows.forEach((row, index) => {
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console.log(` 行 ${index + 1}:`);
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Object.entries(row).forEach(([key, value]) => {
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console.log(` ${key}: ${value}`);
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});
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});
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return result.rows;
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} catch (error) {
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console.error(`获取表 ${tableName} 数据示例时出错:`, error);
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return null;
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}
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}
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// 主函数
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async function main() {
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let client = null;
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let outputBuffer = '';
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const originalConsoleLog = console.log;
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// 重定向console.log到buffer和控制台
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console.log = function() {
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// 调用原始的console.log
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originalConsoleLog.apply(console, arguments);
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// 写入到buffer
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outputBuffer += Array.from(arguments).join(' ') + '\n';
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};
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try {
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// 连接数据库
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client = await connect();
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// 获取所有表
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const tables = await getAllTables(client);
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if (!tables) {
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console.error('无法获取表列表');
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process.exit(1);
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}
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console.log('\n所有PostgreSQL表:');
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console.log(tables.join(', '));
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// 获取所有表的结构，而不只是特定表
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for (const tableName of tables) {
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await getTableSchema(client, tableName);
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// 移除数据示例检查
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// await getTableDataSample(client, tableName);
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}
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console.log('\n数据库结构检查完成');
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// 保存输出到指定目录
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const timestamp = new Date().toISOString().replace(/[:.]/g, '-');
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// 确保目录存在
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if (!fs.existsSync(DB_REPORTS_DIR)) {
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fs.mkdirSync(DB_REPORTS_DIR, { recursive: true });
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}
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const outputPath = path.join(DB_REPORTS_DIR, `postgres-schema-${timestamp}.log`);
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fs.writeFileSync(outputPath, outputBuffer);
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originalConsoleLog(`结果已保存到: ${outputPath}`);
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} catch (error) {
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console.error('检查数据库结构时出错:', error);
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process.exit(1);
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} finally {
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// 恢复原始的console.log
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console.log = originalConsoleLog;
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// 关闭数据库连接
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if (client) {
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await disconnect(client);
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}
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}
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}
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// 导出函数
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module.exports = {
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connect,
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disconnect,
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getAllTables,
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getTableSchema,
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getTableDataSample,
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main
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};
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// 如果直接运行此脚本，则执行main函数
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if (require.main === module) {
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main().catch(error => {
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console.error('运行脚本时出错:', error);
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process.exit(1);
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});
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}
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