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38 lines
1.1 KiB
Markdown
38 lines
1.1 KiB
Markdown
The following sequence diagram shows the typical flow of a query from the CLI to the [VDBE](https://www.sqlite.org/opcode.html).
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```mermaid
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sequenceDiagram
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participant main as cli/main
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participant Database as core/lib/Database
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participant Connection as core/lib/Connection
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participant Statement as core/lib/Statement
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participant Parser as sql/mod/Parser
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participant Scanner as sql/mod/Scanner
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participant translate as translate/mod
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participant Program as vdbe/mod/Program
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main->>Database: open_file
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Database->>main: Connection
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main->>Connection: query(sql)
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Note right of Parser: Uses vendored sqlite3-parser
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Connection->>Parser: next()
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Note left of Parser: Passes the SQL query to Parser
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Parser->>Scanner: scan()
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Scanner->>Parser: returns tokens
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Parser->>Connection: Cmd::Stmt
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Connection->>translate:translate()
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Note left of translate: Translates SQL statement into bytecode
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Connection->>main: Ok(Some(Rows { Statement }))
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main->>Statement: step()
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Statement->>Program: step()
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Note left of Program: Executes bytecode instructions<br />See https://www.sqlite.org/opcode.html
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Program->>Statement: StepResult
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Statement->>main: StepResult
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```
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