add sqldbchain and example

2026-06-28 13:00:56 +03:00 · 2023-04-18 00:36:18 +01:00
parent 5bd7c62cb3
commit e1624d11d5
3 changed files with 251 additions and 0 deletions
@@ -0,0 +1,81 @@
+import { INode, INodeData, INodeParams } from '../../../src/Interface'
+import { SqlDatabaseChain } from 'langchain/chains'
+import { getBaseClasses } from '../../../src/utils'
+import { DataSource } from 'typeorm'
+import { SqlDatabase } from 'langchain/sql_db'
+import { BaseLLM } from 'langchain/llms/base'
+
+class SqlDatabaseChain_Chains implements INode {
+    label: string
+    name: string
+    type: string
+    icon: string
+    category: string
+    baseClasses: string[]
+    description: string
+    inputs: INodeParams[]
+
+    constructor() {
+        this.label = 'Sql Database Chain'
+        this.name = 'sqlDatabaseChain'
+        this.type = 'SqlDatabaseChain'
+        this.icon = 'sqlchain.svg'
+        this.category = 'Chains'
+        this.description = 'Answer questions over a SQL database'
+        this.baseClasses = [this.type, ...getBaseClasses(SqlDatabaseChain)]
+        this.inputs = [
+            {
+                label: 'LLM',
+                name: 'llm',
+                type: 'BaseLLM'
+            },
+            {
+                label: 'Database',
+                name: 'database',
+                type: 'options',
+                options: [
+                    {
+                        label: 'SQlite',
+                        name: 'sqlite'
+                    }
+                ],
+                default: 'sqlite'
+            },
+            {
+                label: 'Database File Path',
+                name: 'dbFilePath',
+                type: 'string',
+                placeholder: 'C:/Users/chinook.db'
+            }
+        ]
+    }
+
+    async init(nodeData: INodeData): Promise<any> {
+        const databaseType = nodeData.inputs?.database
+        const llm = nodeData.inputs?.llm as BaseLLM
+        const dbFilePath = nodeData.inputs?.dbFilePath
+
+        const datasource = new DataSource({
+            type: databaseType,
+            database: dbFilePath
+        })
+
+        const db = await SqlDatabase.fromDataSourceParams({
+            appDataSource: datasource
+        })
+
+        const chain = new SqlDatabaseChain({
+            llm,
+            database: db
+        })
+        return chain
+    }
+
+    async run(nodeData: INodeData, input: string): Promise<string> {
+        const chain = nodeData.instance as SqlDatabaseChain
+        const res = await chain.run(input)
+        return res
+    }
+}
+
+module.exports = { nodeClass: SqlDatabaseChain_Chains }